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MMD2003-00017
MMD2003 00017 TWALITY MIDDLE SCHOOL wrx October 20, 2003 CITY OF TIGARD OREGON Tigard -Tualatin School District Attn: Stephen Poage 6960 SW Sandburg Road Tigard, OR 97223 Dear Mr. Poage: This letter is in response to your request for Minor Modification (MMD2003-00017) approval to remodel portions of the existing school, add an approximately 5,800 square foot commons area, and to add a maximum of seventeen new parking spaces for a total of 91 parking spaces at Twality Middle School located at 14650 SW 97th Avenue., WCTM 2S111AC, Tax Lot 02700. Twality Middle School was originally constructed in the late 1950's. Although permitted as conditional uses in all residential zones, this school underwent site development review in 1982 (SDR5-82) for a 4,460 square foot expansion, and received a Conditional Use Permit in 1991 (CUP91-00003) to place a portable classroom on site. The 1991 review was completed as a modification to a site development review. Therefore, this request is being reviewed as a modification to an approved Site Development Review rather than a Conditional Use. The Tigard Community Development Code, Site Development Review Section, states; if the requested modification meets any of the major modification criteria, that the request shall be reviewed as a new Site Development Review application." Section 18.360.050(B) states that the Director shall determine that a major modification(s) has resulted if one (1) or more of the changes listed below have been proposed: 1. An increase in dwelling unit density or lot coverage for residential development. The proposal does not involve residential property. Therefore, this standard does not apply. 2. A change in the ratio or number of different types of dwelling units. This criterion is not applicable, as this request does not involve a residential development. 3. A change that requires additional on-site parking in accordance with Chapter 18.765. According to the applicant, Twality Middle School has 42 standard classrooms and 74 parking spaces. The Tigard Development Code requires 2 spaces for every classroom. Utilizing current standards, Twality Middle School would be required to provide a total of 84 parking spaces. Under the proposed plan, the applicant will provide a minimum of 77 parking spaces and a maximum of 91 . The additional parking areas may not be constructed due to lack of funding, however they were proposed as part of the construction. It should be noted that the proposed addition is to the common areas, and does not consist of additional classrooms. Therefore, the school district is not proposing any construction that would require additional on-site parking. All new parking 13125 SW Hall Blvd., Tigard, OR 97223 (503) 639-4171 TDD (503) 684-2772 '-•- • areas that are proposed meet the design standards of TDC Chapter 18.765 except for the provision of wheel stops. FINDING: The proposed parking areas do not provide for wheel stops as required by the design guidelines in TDC Section 18.765.040. CONDITION: Prior to issuing final occupancy permits for the new commons area, any new parking areas must demonstrate full compliance with the design guidelines of TDC Section 18.765.040. 4. A change in the type of commercial or industrial structures as defined by the Uniform Building Code. No change in the structural occupancy type of the building is proposed. Therefore, this criterion is not applicable. 5. An increase in the height of the building(s) by more than 20 percent. The building height will not be increased as a result of this proposal. 6. A change in the type and location of accessways and parking areas where off-site traffic would be affected. This request will not require a change in accessways or parking areas where off-site traffic would be affected. Therefore, this criterion does not apply. 7. An increase in vehicular traffic to and from the site and the increase can be expected to exceed 100 vehicles per day. This modification will not generate more than 100 vehicular trips per day. According to the applicant, the proposed additions are necessary to accommodate the current students and staff. Therefore, this criterion does not apply. 8. An increase in the floor areas proposed for a non-residential use by more than ten percent excluding expansions under 5,000 square feet. The proposal calls for the addition of a 5,800 square foot expansion to the student commons. The addition constitutes a 4.7% increase in floor area. Therefore, this standard is met. 9. A reduction in the area reserved for common open space and/or usable open space that reduces the open space area below the minimum required by the code or reduces the open space areas by more than ten percent. All new construction is proposed over existing pavement or impervious area with the exception of the parking areas. If the additional parking areas are constructed, they will constitute roughly 9,204 square feet. The site is12.6 acres in site the reduction of the open space will be less than 2%. This standard is not applicable. 10. A reduction of project amenities (recreational facilities, screening; and/or, landscaping provisions) below the minimum established by the code or by more than ten percent where specified in the site plan. The addition will not reduce project amenities. In fact all new parking areas are to be landscaped as currently required by the Community Development Code, thereby increasing the amount of screening on site. 11. A modification to the conditions imposed at the time of Site Development Review approval that is not the subject of criteria (B). 1 through 10 above. The modification will not impact any of the conditions of approval of SDR5-82. This standard is not applicable. Page 2 of 3 Also, any addition of impervious surface over 5,000 square feet requires compliance with the Clean Water Services water quality and quantity standards. FINDINGS: The applicant has provided preliminary calculations and plans to the engineering department for review. The calculations are complete, but not approved by a certified engineer. CONDITION: Prior to the issuance of building permits, the applicant shall supply a set of stamped plans from a certified engineer for all stormwater improvements. THIS REQUEST HAS BEEN APPROVED SUBJECT TO THE FOLLOWING CONDITIONS. PLEASE SUBMIT A COPY OF THIS LETTER WITH YOUR PROPOSED MODIFICATIONS TO THE BUILDING DEPARTMENT. CONDITIONS OF APPROVAL Submit to the Planning Department (Brad Kilby, 639-4171, ext. 2434) for review and approval: 1 . Prior to the issuance of building permits, the applicant shall supply a set of stamped plans from a certified engineer for all stormwater improvements. 2. Prior to issuing final occupancy permits for the new commons area, all new parking areas must demonstrate full compliance with the design guidelines of TDC Section 18.765.040. This approval is based on the plans and drawings submitted, as well as the statement provided by the applicant. Deviation from these plans and documents, except as approved by the Community Development Department, shall render this decision void. This request is determined to be a minor modification to an existing site. The Director's designee has determined that the proposed minor modification of this existing site will continue to promote the general welfare of the City and will not be significantly detrimental, nor injurious to surrounding properties provided that, development which occurs after this decision complies with all applicable local, state, and federal laws. If you need additional information or have any questions, please feel free to call me at (503) 639-4171 ext. 2434. Sincerely, ‘.).( Brad Kilby Associate Planner c: 2003 Planning Correspondence file SDR 5-82 Land Use file Page 3 of 3 APPLICANT MATERIALS MANOR MODIFICA ION LL�� TYPE I APPLICATION CITY OF TIGARD 13125 SW Hall Blvd., Tigard, OR 97223(503) 639-4171 FAX: (503) 684-7297 GENERAL INFORMATION Property Address/Location(s): ly6.50 5W 7 'Avevt ue. Tax Map &Tax Lot#(s): ZS IIt AG Oz. 00 FOR STAFF USE ONLY Site Size: IS.55 Acre-5 Case No.(s): M r D aoa3 -poo i 7 Applicant*: 779 arc(- jactti)1 cc-too( Other Case No.(s): Address: 6 1.60 (..3 Sava('rj Sf Receipt No.: airer ,Zap O 3 — >t City/State: %t 0-tit U� Zip: 97Z2-3 y Application Accepted By: e • Ca,--y12.2...) Primary Contact: S tepltev% Poa9 of Date: 9 — 1 / —o3 Phone: 503— `I I-9000 Fax: Sn3-413)-4-1047 Property Owner/Deed Holder(s)*: (Attach list if more than one) Date Determined Complete: Same 05 G 776 ff� Rev.2/28/2003 is\curpin\masters\revised\minormod.mst Address: Phone: City/State: Zip: *When the owner and the applicant are different people, the applicant REQUIRED SUBMITTAL ELEMENTS must be the purchaser of record or a lessee in possession with written (Note: applications will not be accepted authorization from the owner or an agent of the owner. The owner(s) without the required submittal elements) must sign this application in the space provided on the back of this form or submit a written authorization with this application. El PROPOSAL SUMMARY Application Form The owners of record of the subject property request permission for a ® Owner's Signature/Written Authorization Minor Modification. To review a modification as a Minor ❑ Title Transfer Instrument or Deed Modification, the Director must first find that the expansion does not invoke one or more of the 11 criteria discussed within Section R] Site Development Plan (3 copies) 18.120.070(B) of the Tigard Development Code. If the modification exceeds the maximum allowed under any one or more of the ® Site/Plot Plan (reduced 81/4"x 11") following criteria, a Major Modification review is required. Major Modifications are processed in the same manner as a new Site ® Applicant's Statement (3 copies) Development Review. In a separate letter, please address the (Addressing Criteria Under Section 18.360.050(B) criteria below contained in Section 18.360.050(B) including a detailed response to each criteria. ❑ Filing Fee $446.00 1. An Increase in dwelling unit density or lot coverage for residential development. Jurisdiction: ❑ City ❑ Urb 2. A change in the ratio or number of different types of dwelling units. 3. A change that requires additional on-site parking in accordance with Chapter 18.765. In addition, the Director must find that the 4. A change in the type of commercial or industrial structures as defined by the Uniform proposed change complies with the underlying Building Code. standards of the applicable zoning district. To 5. An increase in the height of the building(s)by more than 20%. complete this review, the Applicant's proposal 6. A change in the type and location of accessways and parking areas where off-site must include a discussion indicating how the traffic would be affected. site expansion will continue to comply with the 7. An increase in vehicular traffic to and from the site and increase can be expected to minimum setback, building height, parking,tand exceed 100 vehicles per day. landscaping standards. Other applicable 8. An increase in the floor area proposed for a non-residential use by more than 10% requirements such as minimum Clear Vision excluding expansions under 5,000 square feet. areas near driveways and street intersections 9. A reduction in the area reserved for common open space and/or usable open space may also be applicable depending on where that reduces the open space area below the minimum required by this code or the building expansion is proposed to be reduces the open space area by more than ten percent. constructed on the site. 10. A reduction of project amenities (recreational facilities, screening, and/or, landscaping provisions) below the minimum established by this code or by more than 10% where specified in the site plan. 11. A modification to the conditions imposed at the time of Site Development Review approval that are not the subject of Criteria 1 through 10 above. Sep 02 03 09: 48a Murphy 50396816 74 p. 5 APPLICANTS: To consider an application complete, you will need to submit ALL of the REQUIRED SUBMITTAL ELEMENTS as described on the front of this application in the"Required Submittal Elements"box. — (Detailed Submittal Requirement Information sheets can be obtained, upon request, for all types of Land Use Applications.) THE APPLICANT(S) SHALL CERTIFY THAT: • The above request does not violate any deed restrictions that may be attached to or imposed upon the subject property. • If the application is granted, the applicant will exercise the rights granted in accordance with the terms and subject to all the conditions and limitations of the approval. • All of the above statements and the statements In the plot plan, attachments, and exhibits transmitted herewith, are true; and the applicants so acknowledge that any permit issued, based on this application, and may be revoked If It is found that any such statements are false. • The applicant has read the entire contents of the application, including the policies and criteria, and understands the requirements for approving or denying the application. SIGNATURES of each owner of the subject property. /( DATED this 3 day of ��j -ogA.10 re-/Z ,200 3 X /-1t5 Owner's na re / Owner's Signature Owner's Signature Owner's Signature A CITY OF TIGARD 9/25/2003 13 12 5 SW Hall Blvd. 10:36:40AM Tigard,Oregon 97223 +�- 1J-1 (503) 639-4 17 1 Receipt #: 27200300000000004271 Date: 09/25/2003 Line Items: Case No Tran Code Description Revenue Account No Amount Paid MMD2003-00017 [LANDUS]Minor Modification 100-0000-438000 446.00 Line Item Total: $446.00 Payments: Method Payer User ID Acct./Check Approval No. How Received Amount Poid TRUST TIGARD-TUALATIN SCHOOL TTSD23J In Person 446.v0 Payment Total: $446.00 Page lofl cReceipt.rpt 1.04■10 Tvvality Middle School MINOR Aii0D111C/11101M 10 A 0 Conthtlollal S � O O � Se Permit W N &runimm.18121103 .y. •J" ftk Cornerstone Construction Management, Inc. Twality Middle School KEY INFORMATION Project Name: Twality Middle School Minor modification of an existing conditional use Property Description: 2S111ACO2901 Location: 14650 97th Avenue Parcel size: Approximately 15.55 acres Zoning: R-4.5 Applicant: Tigard-Tualatin School District 23J 6960 SW Sandburg Street Tigard, Oregon 97223 Attention: Stephen Poage Telephone 503-431-4003 Fax: 503-431-4047 Property Owner: Same Applicants Representatives: Project Manager Nick Harris, Senior Project Manager Cornerstone Construction Management Inc. 5410 SW Macadam Avenue, Suite 250 Portland, Oregon 97210 Telephone 503-295-0108 O Fax 503-295-1896 G��� �G Architect v 003 Keith Johnson FQ �5 Dull Olson Weekes Architects OF l\GEeR�NG 319 SW Washington St., Suite 200 040/4 Portland, Oregon 97204 Telephone 503-226-6950 Fax 503-273-9192 °v�Q Land Use Planner REG Ed Murphy `10\1 Ed Murphy & Associates ccP 2 9875 SW Murdock St. T�GPa° ,Na Tigard, OR 97224 o ENGINEER Telephone 503-624-4625 ii)0 1N"N� Fax 503-968-1674 edmurphy&associates/ttsd/tms-cup/findr/9/17/03 1 Twaliry Middle School Civil Engineer Mark Wharrey SJO Consulting Engineers 6650 Redwood Lane, Suite 360 Tigard, OR 97224 Telephone 503-226-3921 Fax 503-226-3926 Landscape Design Nick Wilson Atlas Landscape Architecture 320 SW 6th Avenue, Suite 310 Portland, OR 97204 Telephone 503-224-5238 Fax 503-224-5239 2 edmurphy&associates/ttsd/tms-cup/findr/9/17/03 Twality Middle School SUMMARY • The Tigard-Tualatin School District plans to construct some minor modifications to the Twality Middle School. The modifications fit the description of a minor, versus a major, • modification of a conditional use permit. • The modifications include the addition of a multi-use student commons space near the southwest corner of the existing building, which will function as a cafeteria, informal performance space, and a community meeting space. It will add approximately 5800 square feet of floor space, which represents a 4.7% increase in the total square footage of the elementary school. • The capacity of the school will not change, and will remain at 1060 students. The number of staff persons will also remain the same. • Sixteen parking spaces will be added in the northwest corner of the property. Thirteen spaces will be removed along the south side to make room for the building addition, for a net increase in three parking spaces (from 74 existing to 77 proposed). There may be two additional parking areas created on the north side of the property, shown as "alternate bids" on the site plan. If both of these were constructed, it would add another 14 parking spaces, for a total of 91 parking spaces. • There will be virtually no impact to the sewer, water, roads and storm water systems. There will be a 9490 square foot increase in the amount of impervious surface. edmurphy&associates/nsd/tms-cup/5ndr/9/17/03 3 Twaliry Middle School This page intentionally left blank 4 edmurphy&associates/ttsd/tms-cup/findr/9/17/03 Twality Middle School BACKGROUND INFORMATION History: The property is made up of one tax lot, a 15.5-acre parcel with frontage on SW 97th Avenue on the west side, and SW Inez Street along a portion of north side. (Please refer to the Tax Assessor's map, Exhibit `A'). The site slopes slightly from west to east. northwest to the southeast. The school has been in this location since it was built in the early 1960's. It was expanded by about 4500 square feet in 1982. The most recent modification to the conditional use permit occurred in 1991, when two portable classrooms were added, along with four parking spaces. (Please refer to Aerial Photograph, Exhibit `B'). Adjacent uses. The property is zoned R-4.5, as is the surrounding neighborhood. (Please refer to Zoning Map, Exhibit `C'). The property is bordered by single-family homes on the west, north and east sides, and a portion of the south side. Most of the property to the south is developed as Templeton Elementary School. Description of Proposal. The modifications will greatly improve the quality of the middle school. Most of the modifications are improvements to the existing building, including remodeling the kitchen, and improving the mechanical, electrical, and plumbing systems. The existing building will be expanded by 5800 square feet in the southwest corner of the building, where a new "commons" space will be added. The site itself will not change significantly, except for a new parking area(s) near the existing parking lot on the northwest corner of the property. (Please refer to Architectural Site Plan, Sheet A1.1, Exhibit D'). The school is already served with adequate sewer, water and storm water lines. No changes to any of the existing utilities are necessary, except for a 3" water line near the south driveway entrance that will be cut, re-routed, and re-connected. The traffic impact is minimal, since access to the new school is provided in the same manner as access to the existing school. The south driveway will be modified slight near the commons addition for improved bus queuing. There are no sensitive lands that will be impacted by the proposed use, i.e. wetlands, steep slopes, floodplains, or wildlife habitats. The Washington County Clean Water Services (CWS) Agency has provided a service provider letter. (Please refer to the CWS letter, Exhibit `E'.) Chapter 18.390.040.B.2.e Impact Analysis: No impact study is required as part of the Type I procedure. No improvements to the transportation, drainage, parks, water, and sewer systems are necessary to meet City standards or to minimize the impact of the development on the public at large, public facilities systems, and affected private property users. Drainage System: A storm water detention pond and storm water quality swale is proposed between the existing parking lot and the new proposed parking lot on the north end of the school site. (Please refer to Civil Utility Plan, Sheet C4, Exhibit `D') edmurphy&associates/ttsd/tms-cup/findr/9/17/03 5 Twality Middle School Lighting: Currently, only a small portion of the school building, school grounds and parking lots are illuminated. There are only three exterior wall lights on the entire west side of the building, all near the northwest corner of the building. There are two parking lot lights for the north parking lot, and two for the south parking lot. There is also one light over the northern driveway, near SW 97'h Avenue. The new parking lot(s) in the northwest corner of the site will have additional parking lot light(s), as shown on the electrical site plan (Sheet E1.0, Exhibit 'D'). Lighting improvements will also be made to the existing parking area on the south side of the school. The parking lot lights will be 19" "cutoff' shoebox luminaire on 20' high poles, which will lessen the impact to the neighbors from light intrusion. Police. Fire and other Emergency Services: No impact to police, fire or other emergency services will occur as a result of this proposed site development. The new school building addition will have a full sprinkler system installed, and will be built to modern building code standards. 6 edmurphy&associates/ttsd/tms-cup/findr/9/17/03 Twality Middle School RESPONSE TO CUP CRITERIA Chapter 18.330 of the Tigard Development Code (hereinafter "Code" or "TDC") contains the standards and procedures under which a conditional use may be permitted. Section 18.330.030 contains the approval standards, which are as follows: 18.330.020.0 1. Any modification which is not within the description of a major modification as provided in Subsection B above shall be considered a minor modification. Response: The proposed modifications do not fall within the description of a major modification. In particular, there is no change in the type and/or location of access ways and parking areas where off-site traffic would be affected, and the increase in floor area is less than 10%. Therefore, the proposed improvements should be considered as a minor modification. Following are responses to the criteria found in Section 18.330-1 of the Tigard Development Code showing that the modifications are properly classified as minor. a. A change in land use. Response: The land use stays the same, a public middle school b.An 10% increase in dwelling unit density; Response: There are no existing or proposed dwelling units on this site. c. A change in the type and/or location of access ways and parking areas where off-site traffic would be affected; Response: There is a new parking lot proposed near the north property line, but the location and use of this parking lot will not affect off-site traffic. The use of the circular driveway will remain the same. The driveway will be moved west (into the sloped area) on the south end to improve the bus queuing and passenger loading area. However, this shifting of the driveway will not significantly affect the width of the south entrance driveway where it intersects with SW Murdock Street and SW 97"' Avenue, and will not affect off-site traffic. d. An increase in the floor area proposed for non-residential use by more than 10% where previously specified; Response: The floor area will be increased from 122,532 square feet to 128,335 square feet, which is an increase of only 4.7%. e. A reduction of more than 10% of the area reserved for common open space and/or usable open space; Response: There will be no reduction in the amount of common open space and/or usable open space. The usable and common open space is behind (to the east of)the building, and is used for ball fields and a track. The area where the new parking will be constructed would not be considered common or usable open space. f. A reduction of specified setback requirements by more than 20%; Response: There will be no reduction of the specified setback requirement. edmurphy&associates/ttsd/tms-cup/findr/9/17/03 7 Twality Middle School g. An elimination of project amenities by more than 10% where previously specified provided such as: (1) Recreational facilities; (2) Screening; or (3) Landscaping provisions; Response: There will be no elimination of previously specified project amenities as a result of this application. h. A 10% increase in the approved density; Response: The projected student and staff populations are expected to stay level with the current population. 2. An applicant may request approval of a minor modification by means of a type I procedure, as regulated by Section 18.390.030, using approval criteria in Subsection C3 below. Response: The school District is requesting approval of a Type I minor modification. 3. A minor modification shall be approved, approved with conditions, or denied following the Director's review based upon findings that: a. The proposed development is in compliance with all applicable requirements of this title; and b. The modification is not a major modification as defined in Subsection A above. Response: Although this section of the Development Code is not specific about which requirements of the Code are applicable, other sections of the Code, along with the application form, provide additional guidance. This application will demonstrate that the proposed development is in compliance with all applicable requirements. 18.330.030 Approval Standards and Conditions of Approval The criteria for approval, as per Section 18,330.030.A, are: 1. The site size and dimensions provide adequate area for the needs of the proposed use. Response: The parcel size is rectangular in shape, and approximately 15.5-acres in size. It is relatively flat, except for the area between the building and SW 97th Street, which is sloped. The middle school building, after the remodel, will be 128,335 square feet in size, or just 19 % of the site size. The site where the school building addition is proposed is not an area that is subject to ground slumping or sliding. There is adequate distance between the new school building addition and any surrounding buildings, which provides for adequate light and air circulation, and accessibility to fire-suppression equipment. Therefore, there is adequate area to meet the needs of the proposed use. 2. The impacts of the proposed use of the site can be accommodated considering the size, shape, location,topography,and natural features. Response: The only area where the existing use is being expanded is at the southwest corner of the school, which is flat and already improved as a parking lot. The only impact to the natural features will be that two trees will need to be removed in the area where the building addition and walkways will be constructed. Only one of these trees is of a significant size (over 12" in diameter). All of the other trees on the site will be retained. There will be no significant impacts to any of the adjacent neighbors. The height of the new 8 edmurphy&associates/ttsd/tms-cup/findr/9/17/03 Twality Middle School addition will be within the 30' maximum height limit. The lighting from the school building and new parking lot will be designed to minimize the impact on the neighborhood. Therefore, the impacts of the proposed use can be accommodated. 3. All required public facilities have adequate capacity to serve the proposal. Response: The student population will remain the same. There is virtually no impact to the public utilities or to the transportation system. Other semi-public facilities and services, including electrical, natural gas, cable, and garbage disposal are available, and the construction of the new addition will not significantly change the impact on those services and facilities. 4. The applicable requirements of this zoning district are met except as modified by this chapter. Response: The proposed use meets the applicable requirements of the Development Code, particularly with regard to minimum building setbacks, maximum building height, and minimum and maximum parking, and clear vision areas. The landscaping is mature, including the street trees along SW 97th Street. No screening and buffering is required between a residential zone and a school. Only one tree over 12" in diameter will be removed; no mitigation is required since over 75% of the significantly sized trees will remain. The property is zoned R-4.5. The middle school is a pre-existing use. The addition to the building and the new parking lot will comply with all of the applicable requirements of R-4.5 zone. Following is a summary of how the school and site comply with the zoning district regulations. Minimum lot size. The requirement is 7500 sq. ft. per unit. The lot size exceeds this minimum lot size requirement. Average lot width. The requirement is 50 feet. The lot width exceeds this minimum average lot width standard. Minimum building setbacks. The setback requirements ordinarily applicable in the R-4.5 zone are superceded by Section 18.330.050.B.8 of the Development Code. The school will exceed those setbacks (explained in more detail below). Maximum Building Height. The maximum allowable building height is 30 feet. The proposed addition to the middle school building will not exceed the maximum building height. Maximum percentage of lot coverage. There is no maximum percentage of lot coverage in the R-4.5 zone. Streets. No changes to the street system or facilities are proposed. SW 97th Avenue and SW Inez Streets are the only two bordering streets. SW Inez Street is already fully improved. SW 97th Avenue lacks sidewalks along the east side, but the School District does not plan on constructing a sidewalk as a part of this project. (According to the pre- application notes, improvements to SW 97th Avenue will not be required). edmurphy&associates/ttsd/tms-cup/findr/9/17/03 9 Twality Middle School Pedestrian and handicapped accessibility. Pedestrian accessibility to the middle school will remain the same as it is currently. Accessible parking will be provided as shown on the site plan. Accessible parking. The proposed site plan calls for 16 - 30 new parking spaces, and the removal of 13 parking spaces. The net total number of parking spaces will be 77 — 91 (depending on whether the alternate bids are accepted), of which 3 will be accessible. Bicycle parking. The Code requires 6 spaces per classroom. But because this application is for a minor modification, and the current number of bicycle spaces is adequate, the School District does not intend to add more bicycle parking spaces at this time. Utilities. All utilities will meet City standards. All new on-site utilities will be undergrounded. (Please refer to the Civil Utility Plan, Sheet C4, Exhibit D'). Parking lot landscaping. Most of the parking area would be considered a pre-existing use. The new parking lot(s) will meet the City standard of one parking lot tree per seven parking spaces. (Please refer to the Planting Plan, Sheet L101, Exhibit `D', which shows 5 trees for 30 spaces). The parking lots are screened from view with shrubs. Parking lot lighting. The lighting from the new parking lot will be directed downward so as not to interfere with the neighbor's properties. Minimum percentage of site landscaping. There is no minimum required percentage of landscaping in the R-4.5 zone. Buffering and Screening. Buffering and screening is not required in this case because schools are not listed in the buffer matrix (Table 18.745.1). However, the District plans on screening the new parking lot in the northwest corner of the site from the adjoining residential property owners with shrubs and trees. In addition, the District plans to retain the three trees between the existing and the new parking area, which provides some screening of the school from the closest adjoining home. 5. The applicable requirements of 18.330.050; Response: Subsection 8 of Section 18.330.050 applies, which sets different setback standards that the R-4.5 does. These standards are: • Front yard—30 feet • Side yard facing street—20 feet • Side yard—20 feet • Rear yard—20 feet. The building, after the addition of the commons area, will still exceed these setback standards. The actual setbacks will be: front — 60 feet; south side yard — 24 feet; north side yard — 155 feet; and rear yard —682 feet. 6. The supplemental requirements set forth in other chapters of this code including but not limited to Chapter 18.780, Signs, and Chapter 198.360, Site Development Review, if applicable, are met. 10 edmurphy&associates/ttsd/tms-cup/findr/9/17/03 Twality Middle School Response: Because this is a minor modification, most chapters of the code are not applicable. That is, the City does not expect the School District to bring the entire site up to current city standards as a condition of the minor modification. This proposed use is not subject to the Site Development Review Chapter of the Code. Section 18.360.020.A.5, under "applicability and exemptions", says site development review shall not apply to "any proposed development which has a valid conditional use approved through the conditional use permit application process". However, this application will address those standards in the Development Code which appear to be applicable, as follows: APPLICABLE STANDARDS Chapter 18.705 Access, Egress and Circulation. The access, egress and circulation will not change, other than the minor change to the south driveway. Chapter 18.710 Accessory Residential Units. The Chapter is not applicable. Chapter 18.715 Density Computations. The Chapter is not applicable. Chapter 18.720 Design Compatibility Standards. The Chapter is not applicable. Chapter 18.725 Environmental Performance Standards. This Chapter applies the federal and state environmental laws, rules and regulations to development within the City of Tigard. • Noise. The City's noise ordinance makes an exception to the noise regulations for schools, in Section 7.40.180. • Visible emissions. This applies only to areas zoned commercial or industrial, and is not applicable to schools. • Vibration. There will not be any vibrations emanating from the school property that will be discernible without instruments at the property line. • Odors. There should not be any odorous gases or other matter generated from the school property in such quantities as to be readily detectable at any point beyond the property line. • Glare and heat. The will be no direct or sky-reflected glare visible at the property line, or any emission or transmission of heat or heated air which is discernible at the property line. • Insects and rodents. The materials that might attract rodents will be located near the kitchen and loading area, on the south side of the building behind the new commons area. All wastes will be stored in closed containers, and the grounds will be maintained in a manner that will not attract or aid in the propagation of insects or rodents or create any type of health hazard. Because this is a middle school, it is extremely important that the waste disposal and recycling area be kept as clean as possible at all times. Chapter 18.730 Exceptions to Development Standards. This Chapter is not applicable. Chapter 18.740 Historic Overlay. This Chapter is not applicable. Chapter 18.742 Home Occupations. This Chapter is not applicable. edmurphy&associates/ttsd/tms-cup/findr/9/17/03 11 Twality Middle School Chapter 18.745 Landscaping and Screening. Buffering and screening, As noted previously, the buffering and screening matrix (Table 18.745.1) does not show a requirement for buffering and screening between existing detached single-family units and institutional uses such as schools. Therefore, the buffering and screening requirements are not applicable. Street Trees. Twality Middle School is a pre-existing use, and this requirement does not apply. Nonetheless, there are already several street trees along SW 97th Street. Screening. Screening and landscaping of parking lots, loading areas and refuse containers is required, as per Section 18.745.050.E. The new parking lot area(s) will be screened from view, particularly from the residences to the north and from SW 97th Street. The new parking lot(s) will also include parking lot trees, which will provide some screening from view. The refuse containers will be blocked from view by the new addition to the school, as well as the parking lot tree and shrubs near the southeast corner of the new addition. That is, the refuse containers will not be visible from SW Murdock Street or SW 97th Avenue, or from nearby homes. Chapter 18.750 Manufactured/Mobile Home Regulations. This Chapter is not applicable. Chapter 18.755 Mixed Solid Waste and Recyclable Storage. This Chapter is not applicable, since the remodeling project is not subject to full site plan review. Chapter 18.760 Nonconforming Situations. This chapter does not apply. The structures on the school property conform to the current yard setback, height and other basic dimensional requirements. The use of the land and structures is allowed in the R-4.5 zoning district. The lot size meets the minimum requirements. Chapter 18.765 Off-Street Parking and Loading Requirements. Vehicular parking. For a middle school, a minimum of two parking spaces per classroom are required. The proposed school has 42 classrooms, so at least 84 parking spaces are required. The maximum number of parking spaces allowed is 3.5 spaces per classroom, which would be 147 parking spaces. There are currently 74 existing parking spaces, including three accessible spaces. The architectural site plan, Exhibit D', shows 77 parking spaces, with the potential of another 14, for a total of 91 spaces. Of those, three would be accessible spaces. If neither of the two "alternative bid" parking lots are built, the school will be 7 spaces short of the minimum number of off-street parking spaces required. However, no new classrooms are being added, and the proposed parking additions bring the parking situation closer to meeting the standard. The design of the new parking lot(s) at the northwest corner of the property meets the regulations of this Chapter, including landscaping, lighting, drainage, and width of access aisles. 12 edmurphy&.associates/ttsd/tms-cup/findr/9/1 7/03 Twality Middle School For loading and unloading passengers (TDC 18.765.040.C), the plan proposes shifting the driveway where school busses queue for loading children westward, just in the area along the new commons area. This accommodates the new addition, and provides a better passenger loading area by providing additional covered waiting space. Bicycle parking. This standard does not apply to a pre-existing use, and a major modification of a conditional use permit. No increase in the number of students attending Twality Middle School is anticipated as a result of these building improvements. Chapter 18.775 Sensitive Lands. There are no sensitive lands affected by this proposal. Chapter 18.780 Signs. The District is not proposing any new signs at this time. Chapter 18.785 Temporary uses. This Chapter is not applicable. Chapter 18.790 Tree removal. The location of the existing trees over 6" in caliper are shown on the grading and erosion control plan (Sheet C3, Exhibit `D'). Only one tree over 12" in diameter will be removed, which is 5% of the total number of trees over 12". (There are 19 trees over 12" in diameter, one of which will be removed). Since over 75% of the trees over 12" in caliper are being retained, no mitigation is required. Chapter 18.795 Visual Clearance Areas. No significant change to the existing driveways is proposed; the visual clearance areas are not affected. Chapter 18.797 Water Resources (WR) Overlay District. This Chapter is not applicable. Chapter 18.798 Wireless Communication Facilities. This Chapter is not applicable. Chapter 18.810 Street and Utility Improvement Standards. Since this is a minor modification of a conditional use, this chapter does not apply. No improvements to the public streets or utilities are proposed. edmurphy&associates/ttsd/tmscup/findr/9/17/03 13 Twality Middle School This page intentionally left blank 14 edmurphy&associates/ttsd/tms-cup/findr/9/17/03 Twality Middle School CONCLUSIONS The addition of a student and community use commons area to the Twality Middle School, along with the new parking area(s), will be a tremendous improvement to the school, and will benefit the neighborhood and the entire city. The proposed addition and the new parking lot(s) meet the criteria for a minor modification to a Conditional Use Permit and comply with applicable development standards. edmurphy&associates/ttsd/tms-cup/findr/9/17/03 15 Twality Middle School This page intentionally left blank 16 edmurphy&associates/ttsd/tms-cup/findr/9/17/03 Twality Middle School EXHIBITS Exhibit`A' Tax assessor's map showing the location and dimensions of the tax lot Exhibit 'B' Aerial photograph Exhibit`C' Zoning Map Exhibit `D' Architectural Site Plan Sheet A1.1 Architectural Site Plan Sheet C3 Grading and Erosion Control Plan Sheet C4 Civil Utility Plan Sheet L101 Planting Plan Sheet E1.0 Electrical Site Plan Exhibit `E' Service provider response - Clean Water Services Agency edmurphy&associates/ttsd/tms-cup/findr/9/17/03 17 . 2S 1 1 lAC 2S 1 i1Au 1 I - .. .. • „ .. _ .. • •• •.• , .. •.,:,;;,;.:Milli-;;:l . kl SW : lam auk "7."4•L'e co INEZ "=''I STREET Wiall'Ol MMUS i a : :q..s!",.''•.' 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I --,i,:• X \ \ 0 E I • / LcIA \I\ CD Cr) / / .....--• ., . (I. I \\ \ \ ' 1:1 -...---- e oa CU 3 I , •, • '13 I i \ '.\ L'-:(1 I ... EXISTING TWALITY _ .1. / \.,: \ I MIDDLE SCHOOL 'ITEN i / \ ... i ( at't - tCY/- - . ---- .... 13 CI . --- -...- ' '• l / i I ,4'. Z5 r. 1 , 3 < cr) S 1 ,_,... .../ ' I I- • . \ \ I I 1 I __ I ...--- '- , \„-- ' s \ \ 1 1 1 .] .., t. m Coosolitee hewers 2007 SI_Alb SI — , ir„,...-.0. \ • L /1 -7 ''' / ., , „..--\ . \ ...---- / / / /............si / /As \ ..- \ Iizci_i > \\....„...., • / / ______ \ \ ' \ \ _ \-------------- __ -,.. / .," ,,-/ ..,/ -' \--- \ ''% ., ----: c i -- \ ' \ -- . .-- - ...?"-- \ \ \ ..,,,"fr''' \ \ ' - . .''' -f•---''( ,• -. ■ ,. - ___ ,// / • . \- ---- , „------- 7.7.------- // -----...,/ ( ELECTRICAL SITE PLAN I ----------...,,N\ \ \\c.----- _ phase Seem a:Design revisdionsate 111 September 5,23 / / E!,:N. SCALE. t••AY-0. .4" ....''.- - --■, / / \ .. ..' . -- __..--"" / / . I I .., 7-----...\ , ........ \ ,,,. _, ..... . ...., \...t,„. .........„ Nfr , , /, / , , LIGHTING FIXTURE LIST \ -- \\ . – (--------- /,,...V \ mi LAY, 010/ACTUROI ; WAITS RAM C(SCRIP101___=_. CRAST \r../'' i / , le I 010 MI CAW ,1091-3-23010.040 !RRE Tr'MEW ERCOPI EMMA( 1 rosA•P MANTEL \ \ IRUESC STOAT :IL •00111/1C AP f RCM ,1•15111C *LUMP •21 n c sc.SIER KU•M• 0191 TO Pf01 CANON • I pf Ofed# 03029 • \ ./A/ , I i ELVS/REIT-MOM%ASS lEAS/RRE I 10.00 WITT-TOP \ ELECTRICAL 4/ ..... --- st 1 MI I PLIAS! -RASE SIMT _ E1 .0 , r t Exhibit `E' 5.1u consu r_t i ng 5032263926 •-/28 '03 14:22 No.722 03 1 4 AUG 2 8 2003 J1 File Number 33 ? • CleanWatea� Srt vices ZOur commitment ip clear. - Pre-Screening Site Assessment en N a aa�1,, t r� Jt.� ctiort CcrY oo T�r6itp Date fw4vS"T Z8 , Zoo3 l Tax Lot 2S i- It AG Ti. Z-IPo Owner Ttr,, -TvALgsW 0 o S dress 14.4'74 3w W'!_ Scheer_ DAs lucT T1ZAt� ,of- "r12-7--4 Contact 5TO ceAlSo rw4 EUwnERS la Pro fluiLI tNG t}�Dr-ION Address (.(.SC s fiEbotleD LN+ STE. 36o cjn ca �f sw`t& SiT� 1r►P£0+6*tFitTf$ Po{LZLAwtp,PR. 9l"t2.4 °� Pliciie 503- ZZ6 -3928 ORrael use only below this ow Y N NA Y N NA _ ❑ ❑ Sensitive Area I Composite"gyp ❑ ❑ (;4-1 QS# w�tes%tra3y Zre paps ❑ ❑ Locally adopted studies or maps ❑ ❑ O Specify 1--) Specify Based on a review of the above information and the requirements of Clean Water Services Design and Construction Standards Resolution and Order No.03-11: Sensitive areas potentially exist on site or within 200'of the site.THE APPLICANT MUST PERFORM A SITE CERTIFICATION PRIOR TO ISSUANCE OF A SERVICE PROVIDER LETTER OR STORMWATER CONNECTION PERMIT.if Sensitive Areas exist on the site or within 200 feet on adjacent properties,a Natural Resources Assessment Report may also be required. Sensitive areas do not appear to exist on site or within 200'of the site.This pre- screening site assessment does NOT eliminate the need to evaluate and protect water quality sensitive areas if they are subsequently discovered on your property. NO FURTHER SITE ASSESSMENT OR SERVICE PROVIDER LETTER IS REQUIRED_THIS FORM WILL SERVE AS AUTHORIZATION TO ISSUE A STORMWATER CONNECTION PERMIT. The-proposed activity does not meet the definition of development NO SITE ASSESSMENT OR SERVICE PROVIDER LETTER IS REQUIRED. Comments Reviewed By: Date: 'f Returned to Applicant Matt Y Fax Date le S By 0 155 N First Avenue,Sul*270•Hillsboro.Oregon 97124 Phone: (503)846-8621•Fax (5031 846-3525•_,,w,ckm,av .l g TOTAL P.02 LETTER OF TRANSMITTAL 14) U;1ib Consulting Engineers,Inc. 10/14/03 2401 6650 SW Redwood Lane-Suite 360 Portland,OR 97224 ■TTFTio\ ph: 503/226-3921 Kim McMillan fax: 503/226-3926 Twality School TO: City of Tigard "` RECEIVED 13125 SW Hall Blvd �/ Tigard, OR 97223 OCT 14 2003 WE ARE SENDING YOU: z Attached OITYOFTIGARD ❑ Under separate cover via: Courier NLANNINEVENQtNEERING THE FOLLOWING: ❑ Shop Drawings ❑ Prints ❑ Plans - Samples ❑ Specification ❑ Copy of Letter ❑ Change Order ❑ Other _ COPIES DATE No. DESCRIPTION 1 Additional Items Requested by Kim McMillan at City of Tigard for Twality CUP Application - Revised Calculations Showing Exact Drainage Areas - Revised Basin Map Showing Additive Bid Items - Stormwater Maintenance Agreement (Draft) (These have been submitted to Kim directly.) If enclosures are not as noted,kindly notify us at once. THESE ARE TRANSMITTED as checked ❑ For Approval ❑ Approved as Submitted ❑ Resubmit_ copies for Approval ® For Your Use ❑ Approved as Noted ❑ Submit_ copies for Distribution ❑ As Requested ❑ Returned for Corrections ❑ Return Corrected Prints ❑ For Review and Comment ❑ Other ❑ FOR BIDS DUE ❑ Prints returned after loan to SJO REMARKS: Copies To: Signed: Mark B. Wharry O:■2401 TTSD-Twality\DOCS\XTML\101403km.wpd EXAMPLE Service COME RAIN, WE SHINE. (sTORMwATEERM. ; PRELIMINARY Agreement 12021-B NE Airport Way, Portland OR, 97220 Q 800.548.4667 Q 800.361.1271 Q stormwatarinc.com StormFilterTM' name: Serial number: (2)Storm Filter Catch Basins Owner: Contact name: Tigard-Tualation School District Steven Poage Phone: Fax: Federal tax identification number: 503-431-4000 _503-431-4047 Street/Mailing Address: 6960 SW Sandburg Street Tigard,OR 97223 Site Address: 14650 SW 97th Avenue Tigard,OR 97224 Tigard Middle School Media type: Vault size: Cartridges: Agency: Annual maintenance estimate:* 1 _Clean Water Services Term *See reverse for information regarding price increases. From: To: Services provided by Stormwater Management: 1. Mid-season inspection:test/evaluate the filter media for hazardous constituents. (regional composite annually) 2. Evaluate the condition of mechanical filter components. 3. Remove and replace exhausted cartridges and remove accumulated sediment from the vault as necessary. 4. Notify regulatory agency and owner,via written confirmation,that maintenance has been performed. Services not provided by Stormwater Management: 1. Maintenance of other stormwater treatment devices or appurtenances, except as noted in Attachment A. NOTE: the owner is encouraged to maintain these facilities as needed. The services to be performed and the related charges have been based upon the assumptions of unrestricted access, reasonable sedimentation loading, dry conditions, non-hazardous materials and no inappropriate discharges. Work arising from the presence of regulated materials in excess of permitted levels will be billed as extra services. Regulated materials include but are not limited to: Pesticides, Herbicides, Insecticides, Solvents, Fuels, Strong Acids or Bases, Free Oils and/or Greases. Maintenance services will be performed during the dry months (typically July through September). This contract must be signed and returned no later than May 31st to guarantee maintenance in the current calendar year. This agreement is subject to and includes the Service Agreement Terms and Conditions printed on the reverse side of this sheet. This section to be updated/completed by owner or authorized representative: Site Contact Site Telephone No: This is a legally binding contract. Stormwater Management agrees to provide and Customer agrees to accept the specified services. CUSTOMER STORMWATER MANAGEMENT Title Representative's Signature Name(please print) Date Authorized Signature Date M,14 D 2 crc'3 - azt-c9 I 7 STORMWATER MANAGEMENT REPORT for Twality Middle School Building and Parking Additions Tigard, Oregon D mac'`�►�i�s� !PM, 944 B. WNPQQ- D(P1R i"cq 1 (CONDITIONAL USE APPLICATION) 6650 SW Redwood Lane, Suite 360 Portland, Oregon 97224 October, 2003 TWALITY MIDDLE SCHOOL PROJECT TIGARD, OREGON STORMWATER MANAGEMENT REPORT Page 2 TABLE OF CONTENTS 1. Project Overview Existing Site Information Proposed Development Agency Stormwater Criteria Proposed Stormwater Management Exchange of Treatment Areas 2. Stormwater Detention Summary Site Basin Areas Design Storm 24-Hour Rainfall Amounts Basin Curve Numbers (CN) Basin Runoff Concentration Times (Tc) Stormwater Discharge Peak Flows Detention Provided Orifice Control Structure 3. Water Quality Design TWALITY MIDDLE SCHOOL PROJECT TIGARD, OREGON STORMWATER MANAGEMENT REPORT Page 3 1. PROJECT OVERVIEW Existing Site Information The existing school is a developed site with buildings, paving, sidewalks and landscaped areas. The total developed building site is approximately 7.5 acres. Proposed Development The proposed development includes the addition of new building space as well as a new 18 space parking area. In addition, there are two proposed areas of additional parking that will be included as Additive Bid Items. The areas they represent have been included in the overall area treatment calculations. If it turns out that these Additive Bid Items areas are not constructed, there is still enough impervious area being captured and treated to compensate for the new development. The new impervious areas will be constructed in areas that are currently landscaped as well as areas that are existing impervious. Agency Stormwater Criteria Quantity Control: The City of Tigard uses the Clean Water Services criteria for storm water detention. Onsite detention is required to provide quantity control for all new impervious surface runoff. Detention will be provided to detain the 2-year storm, the 10- year storm, and the 25-year storm to pre-development levels. Quality Control: The City of Tigard uses the Clean Water Services manual for stormwater quality. The water quality storm is based on 0.36 inches of rain falling over 100% of the new impervious area over a 4 hour period. Proposed Stormwater Management Water quality and quantity facilities will be provided for the new impervious areas. Fabricated water quality catch basins with biofilers manufactured by Stormwater Management will be used to achieve water quality requirements. An above-ground basin will be installed to provide adequate storage volume for stormwater detention. The stormwater management system for treatment and detention has been designed for an appropriate amount of paving (parking and drive) areas to compensate for the new building roof area. TWALITY MIDDLE SCHOOL PROJECT TIGARD, OREGON STORMWATER MANAGEMENT REPORT Page 4 Exchange of Treatment Areas Per the attached sketches, the new impervious area being added with the project is tabulated as follows: Total New New Impervious Area Created by Project New Bus Lane = 3,735 sf Newly Created Sidewalk Impervious = 331 sf Roof (Over Existing Pervious) = 173 sf Roof (Over Existing Pervious) = 1,000 sf New 16 Space Parking = 5,378 sf New 6 Space Parking = 1,213 sf New 5 Space Parking = 1,079 sf Created Pervious Landscape Island = (322 sf) Created Pervious Landscape Island = (784 sf) Total Net New Impervious Area 11,803 sf Total Paved Area Treated by Project Upper Drive (Existing) = 4,877 sf Lower Drive (Existing) = 1,728 sf New 16 Space Parking Lot = 5,378 sf New 6 Space Parking Lot = 1,213 sf Total Treated Impervious Paved Area 13,196 sf The attached basin maps demonstrates the configuration of the areas. The above calculated treatment area represents 0.30 acres. The system will be designed to treat 0.33 acres, however, to include a small amount of offsite runoff contribution from SW 97`' Avenue. 2. STORMWATER DETENTION Site Basin Areas Parking and Drive Area Basin Basin I Impervious Area Pervious Area Total Acres Pre-Development 0.00 acres 0.33 acres 0.33 Post-Development 0.33 acres 0.00 acres 0.33 Design 24-Hour Rainfall Amounts Design Storm I 24-Hour Rainfall ] Source 2-Year 2.50" Based on Clean Water Services 10-Year 3.45" Stormwater Management Manual 25-Year 3.90" Appendix A Hydrology & Hydraulics TWALITY MIDDLE SCHOOL PROJECT TIGARD, OREGON STORMWATER MANAGEMENT REPORT Page 5 Basin Curve Numbers (CN) Basin I Surface CN I Description Parking Lot New Impervious 98 AC Paving Existing Greenfield 82 _ Lawn Concentration Times (Tc) Basin I Pre/Post 1 Tc Description Parking Lot Pre-Dev 10 min Lawn Post-Dev , 5 min AC Paving Stormwater Discharge Flows Parking Lot Design Storm I PreDev Peak Q I PostDev Peak Q I Req. Det. Vol. 2 Year 0.075 cfs 0.212 cfs 445 cf 10 Year 0.135 cfs 0.297 cfs 541 cf 25-Year 0.169 cfs 0.337 cfs 587 cf Detention Provided Surface Detention Pond: 24' Avg Length x 14' Avg Width x 2' Deep = 672 cf Basin ( Req. Det. Vol. I Design Det. Vol Parking Lot 587 cf 672f Orifice Control Structure Basin Orifice 1 Orifice 1 Orifice 2 Orifice 2 Overflow Diameter Elevation Diameter Elevation Elevation Parking Lot 1.5" Outlet IE 6" 18" 24" 3. Water Quality Design Impervious Area = 0.33 acres = 14,378 sf Rainfall = 0.36" Time Period = 4 hours Water Quality Volume = (14,378)(0.36) / 12 = 431 cf Water Quality Flow = 431 / 14,400 = 0.03 cfs = 13.5 gpm Summary Use Stormwater Management catch basins. A minimum of one catch basin is needed to provide water quality. Site topography requires that two will be needed. See attached vendor data sheets 7 `>c A • .k : • I • F%T I 2 -A �` 111 I Lt '"—t 0• 111111 ■ 1111111 ' -'+s'�.s 3j, \\ 1 1 1 1 1 1 1 --, �e�4� �- �� }ll` I I I I I I I I I ---- [i' 1-i •Sir\.\\ IIIIIIIIIII/ y �� 111111111111 ) I? () 0 \ 1111111111111 IIII \\ \�IIIIIIIIIIIIII ' 111111 1111111111 , .,__•-•! ts \ \�\ ` IIIIIIIIIIIIII 111111IIIII 11111111 \ \ \ y�(1 ` 1111111111111H 111111111Illllilll _ \ iU.i L \ \ •\ / \ 111111111111111 11111111111111( m• \ \ 111111111111111 liimr j L..(.�, 1= \\ '\\::\\\ I1111111111111I 11r211I ' ' i_1;�\\ \\ \ , Ilili11111111I1,14, . 1 J% HMO 111111 Ti \ •� {` \ 111111:1111111 i x •, `1 :`�\ y $ I VIII<.I II I I I r9 r11111� ++ ► f + ri , i'� _�_ `t____ . 111111111111111 .-_11, 1 -M-\\ �. ∎ \ r-1.- 111111111111111 I 11 \ \ •• ! \ �,� i^ 11111{Illilllll +++ �I ,R \.A \ ! �.� /' `� \ ` I I I I I I 1 111111 II + r. \l� \ \ 10 \ \\k \ I I I I I 1 1111111 i 1 �' MIMI \ \ \t . VIII 1 ' ' -_--=—_-'• `.:..:1-1----/'/,....:I"...±...j...) (J) (Li 'i\ . \ \ \ \ \ ' \ \ \ \ \ \7; '----..\ \ .....\ii , -->•‘,- \ --;/\'...-'"....00:,?#.---v------ -A; ''''''';#11... -1'. \ \ \ 1 ' V i/ / I / . 1 ,/ / g$ y \ + ++ + + + + i �� .� + + + + + + \`•• .\ / + + + + + + + + + + + + +.4.4.87fg.+ + + i \ ,.\\ + + + T + + + , .0..:0.•;•,..00. • + + + + + + + '..\ + + + + 4. . .,...r..;_...)1 ,....0 firriNnatiro)Hr++.4.+ +++4.+ 1 + + + + + + + + + + + t + r + A�5378 + + t r + + i;� . i AiteA ....,s ...• :::+++ tr + + + + + + + + + + '- \••\ ''\...7. \ ALTERNATIVE BID ITEM #1—\ i 0+ + \ - 4t toot T + ,Yh i , , 4 ,,,,++ ,,,...3, ,,, ...„,./..„ ,..„, ,,, \ ...i.,<. ......,,,.. .....-\ 1 4-..„+ /17 \ -. - \ \ \ \+ • � N\..\ • • ■ -;-■■ #f . . .. •., .. iiiii. , • , I t `1. v \\ o • ♦ h ALTERNATIVE'BID iTEI #1 -! ♦♦ 1♦ t / i ? , ,. /1-42 I I \....\ \ 4, \ . / I i 1 I pTI ,r,, , , ,-� ' ! , I I I 1 � I I 1. • 1,....., L -t • , AREA ``'; . • 1ULATIONS 1 Fi-i.ii Hydrographs for Parking & Drive Area STORMWATER CALCULATION MATRIX-SANTA BARBARA HYDROGRAPGH METHOD Date: Sep-03 Given: Project= TWALITY-PARKING LOT Area = 0.33 acres Pt = 2.5 inches 2-Year/24 Hour Storm dt = 10 min. Tc = 10 min. (Pre-Developed Site Conditions) PERVIOUS Parcel IMPERVIOUS Parcel Area = 0.33 acres Area = 0 acres CN = 82 CN = 98 S = 2.20 S = 0.20 0.2S = 0.44 0.2S = 0.04 Compute:Developed Conditions Runoff hydrograph Column(3)=SCS Type IA Rainfall Distribution Column(4)=Col. (3)x Pt= 10 year-24 Hour Hyetograph at this location. Column(5)=Accumulated Sum of Col. (4) Column(6)=[If P<=0.2S]=0; Note, use PERVIOUS Area"S"value. [If P>0.2S]=(Col.(5)-0.2S)^2/(Col.(5)+0.8S); Using the PERVIOUS Area"S"value. Column(7)=Col.(6)of Present Time Step-Col.(6)of Previous Time Step Column(8)=Same method as for Col.(6), except use the IMPERVIOUS Area"S"value. Column(9)=Col.(8)of the present time step-Col.(8)of the previous time step. Column(10)=((PERVIOUS area/Total area)x Col.(7))+((IMPERVIOUS area/Total area)x Col.(9)) Column(11)=(60.5 x Col.(10)x Total Area)/10(dt= 10 minutes) Routing Constant,w=dt/(2Tc+dt) = 0.3333 Column(12)=Col.(12)of Previous Time Step+(w x[Col.(11)of Previous Time Step +Col.(11)of Present Time Step-(2 x Col.(12)of Previous Time Step)]) Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. %of Pt in. in. in. in. in. in. in. cfs cfs 1 10 0.0040 0.0100 0.0100 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 2 20 0.0040 0.0100 0.0200 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 3 30 0.0040 0.0100 0.0300 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 4 40 0.0040 0.0100 0.0400 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 5 50 0.0040 0.0100 0.0500 0.0000 0.0000 0.0004 0.0004 0.0000 0.0 0.000 6 60 0.0040 0.0100 0.0600 0.0000 0.0000 0.0016 0.0013 0.0000 0.0 0.000 7 70 0.0040 0.0100 0.0700 0.0000 0.0000 0.0037 0.0020 0.0000 0.0 0.000 8 80 0.0040 0.0100 0.0800 0.0000 0.0000 0.0063 0.0027 0.0000 0.0 0.000 9 90 0.0040 0.0100 0.0900 0.0000 0.0000 0.0096 0.0032 0.0000 0.0 0.000 10 100 0.0040 0.0100 0.1000 0.0000 0.0000 0.0133 0.0038 0.0000 0.0 0.000 11 110 0.0050 0.0125 0.1125 0.0000 0.0000 0.0186 0.0053 0.0000 0.0 0.000 12 120 0.0050 0.0125 0.1250 0.0000 0.0000 0.0246 0.0060 0.0000 0.0 0.000 13 130 0.0050 0.0125 0.1375 0.0000 0.0000 0.0311 0.0065 0.0000 0.0 0.000 14 140 0.0050 0.0125 0.1500 0.0000 0.0000 0.0381 0.0070 0.0000 0.0 0.000 15 150 0.0050 0.0125 0.1625 0.0000 0.0000 0.0455 0.0074 0.0000 0.0 0.000 16 160 0.0050 0.0125 0.1750 0.0000 0.0000 0.0532 0.0078 0.0000 0.0 0.000 17 170 0.0060 0.0150 0.1900 0.0000 0.0000 0.0630 0.0098 0.0000 0.0 0.000 18 180 0.0060 0.0150 0.2050 0.0000 0.0000 0.0732 0.0102 0.0000 0.0 0.000 19 190 0.0060 0.0150 0.2200 0.0000 0.0000 0.0838 0.0106 0.0000 0.0 0.000 20 200 0.0060 0.0150 0.2350 0.0000 0.0000 0.0947 0.0109 0.0000 0.0 0.000 21 210 0.0060 0.0150 0.2500 0.0000 0.0000 0.1059 0.0112 0.0000 0.0 0.000 22 220 0.0060 0.0150 0.2650 0.0000 0.0000 0.1174 0.0115 0.0000 0.0 0.000 23 230 0.0070 0.0175 0.2825 0.0000 0.0000 0.1310 0.0137 0.0000 0.0 0.000 24 240 0.0070 0.0175 0.3000 0.0000 0.0000 0.1450 0.0140 0.0000 0.0 0.000 25 250 0.0070 0.0175 0.3175 0.0000 0.0000 0.1592 0.0142 0.0000 0.0 0.000 26 260 0.0070 0.0175 0.3350 0.0000 0.0000 0.1737 0.0145 0.0000 0.0 0.000 27 270 0.0070 0.0175 0.3525 0.0000 0.0000 0.1884 0.0147 0.0000 0.0 0.000 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 28 280 0.0070 0.0175 0.3700 0.0000 0.0000 0.2032 0.0148 0.0000 0.0 0.000 29 290 0.0082 0.0205 0.3905 0.0000 0.0000 0.2208 0.0176 0.0000 0.0 0.000 30 300 0.0082 0.0205 0.4110 0.0000 0.0000 0.2386 0.0178 0.0000 0.0 0.000 31 310 0.0082 0.0205 0.4315 0.0000 0.0000 0.2566 0.0180 0.0000 0.0 0.000 32 320 0.0082 0.0205 0.4520 0.0001 0.0001 0.2748 0.0182 0.0001 0.0 0.000 33 330 0.0082 0.0205 0.4725 0.0005 0.0004 0.2931 0.0183 0.0004 0.0 0.000 34 340 0.0082 0.0205 0.4930 0.0013 0.0008 0.3116 0.0185 0.0008 0.0 0.001 35 350 0.0095 0.0238 0.5168 0.0027 0.0014 0.3331 0.0215 0.0014 0.0 0.002 36 360 0.0095 0.0238 0.5405 0.0045 0.0018 0.3548 0.0217 0.0018 0.0 0.003 37 370 0.0095 0.0238 0.5643 0.0068 0.0023 0.3766 0.0218 0.0023 0.0 0.004 38 380 0.0095 0.0238 0.5880 0.0095 0.0027 0.3985 0.0219 0.0027 0.0 0.005 39 390 0.0095 0.0238 0.6118 0.0126 0.0031 0.4206 0.0221 0.0031 0.0 0.005 40 400 0.0095 0.0238 0.6355 0.0161 0.0035 0.4427 0.0222 0.0035 0.0 0.006 41 410 0.0134 0.0335 0.6690 0.0218 0.0057 0.4741 0.0314 0.0057 0.0 0.008 42 420 0.0134 0.0335 0.7025 0.0282 0.0064 0.5057 0.0316 0.0064 0.0 0.011 43 430 0.0134 0.0335 0.7360 0.0354 0.0072 0.5374 0.0317 0.0072 0.0 0.013 44 440 0.0180 0.0450 0.7810 0.0461 0.0107 0.5802 0.0428 0.0107 0.0 0.016 45 450 0.0180 0.0450 0.8260 0.0580 0.0119 0.6232 0.0430 0.0119 0.0 0.020 46 460 0.0340 0.0850 0.9110 0.0835 0.0255 0.7049 0.0817 0.0255 0.1 0.032 _ 47 470 0.0540 0.1350 1.0460 0.1315 0.0480 0.8355 0.1307 0.0480 0.1 . 59 48 480 0.0270 0.0675 1.1135 0.1585 0.0271 0.9012 0.0657 0.0271 0.1 0.070 Q peak 49 490 0.0180 0.0450 1.1585 0.1776 0.0191 0.9451 0.0439 0.0191 0.0 4 50 500 0.0134 0.0335 1.1920 0.1923 0.0147 0.9778 0.0327 0.0147 0.0 0.040 9 r> 51 510 0.0134 0.0335 1.2255 0.2075 0.0151 1.0106 0.0328 0.0151 0.0 0.033 52 520 0.0134 0.0335 1.2590 0.2230 0.0155 1.0434 0.0328 0.0155 0.0 0.032 53 530 0.0088 0.0220 1.2810 0.2334 0.0104 1.0649 0.0216 0.0104 0.0 0.028 54 540 0.0088 0.0220 1.3030 0.2440 0.0106 1.0865 0.0216 0.0106 0.0 0.023 55 550 0.0088 0.0220 1.3250 0.2548 0.0108 1.1081 0.0216 0.0108 0.0 0.022 56 560 0.0088 0.0220 1.3470 0.2657 0.0109 1.1297 0.0216 0.0109 0.0 0.022 57 570 0.0088 0.0220 1.3690 0.2767 0.0111 1.1513 0.0216 0.0111 0.0 0.022 58 580 0.0088 0.0220 1.3910 0.2880 0.0112 1.1729 0.0216 0.0112 0.0 0.022 59 590 0.0088 0.0220 1.4130 0.2993 0.0114 1.1945 0.0216 0.0114 0.0 0.022 60 600 0.0088 0.0220 1.4350 0.3109 0.0115 1.2162 0.0216 0.0115 0.0 0.023 61 610 0.0088 0.0220 1.4570 0.3225 0.0117 1.2378 0.0216 0.0117 0.0 0.023 62 620 0.0088 0.0220 1.4790 0.3343 0.0118 1.2595 0.0217 0.0118 0.0 0.023 63 630 0.0088 0.0220 1.5010 0.3463 0.0119 1.2811 0.0217 0.0119 0.0 0.024 64 640 0.0088 0.0220 1.5230 0.3583 0.0121 1.3028 0.0217 0.0121 0.0 0.024 65 650 0.0072 0.0180 1.5410 0.3683 0.0100 1.3205 0.0177 0.0100 0.0 0.023 66 660 0.0072 0.0180 1.5590 0.3784 0.0101 1.3383 0.0177 0.0101 0.0 0.021 67 670 0.0072 0.0180 1.5770 0.3885 0.0102 1.3560 0.0177 0.0102 0.0 0.020 68 680 0.0072 0.0180 1.5950 0.3988 0.0102 1.3738 0.0178 0.0102 0.0 0.020 69 690 0.0072 0.0180 1.6130 0.4091 0.0103 1.3915 0.0178 0.0103 0.0 0.020 70 700 0.0072 0.0180 1.6310 0.4195 0.0104 1.4093 0.0178 0.0104 0.0 0.021 71 710 0.0072 0.0180 1.6490 0.4300 0.0105 1.4271 0.0178 0.0105 0.0 0.021 72 720 0.0072 0.0180 1.6670 0.4405 0.0106 1.4449 0.0178 0.0106 0.0 0.021 73 730 0.0072 0.0180 1.6850 0.4512 0.0106 1.4626 0.0178 0.0106 0.0 0.021 74 740 0.0072 0.0180 1.7030 0.4619 0.0107 1.4804 0.0178 0.0107 0.0 0.021 75 750 0.0072 0.0180 1.7210 0.4727 0.0108 1.4982 0.0178 0.0108 0.0 0.021 76 760 0.0072 0.0180 1.7390 0.4835 0.0109 1.5160 0.0178 0.0109 0.0 0.022 77 770 0.0057 0.0143 1.7533 0.4922 0.0087 1.5301 0.0141 0.0087 0.0 0.020 78 780 0.0057 0.0143 1.7675 0.5009 0.0087 1.5442 0.0141 0.0087 0.0 0.018 79 790 0.0057 0.0143 1.7818 0.5096 0.0087 1.5583 0.0141 0.0087 0.0 0.018 80 800 0.0057 0.0143 1.7960 0.5184 0.0088 1.5724 0.0141 0.0088 0.0 0.018 81 810 0.0057 0.0143 1.8103 0.5272 0.0088 1.5865 0.0141 0.0088 0.0 0.018 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 82 820 0.0057 0.0143 1.8245 0.5361 0.0089 1.6006 0.0141 0.0089 0.0 0.018 83 830 0.0057 0.0143 1.8388 0.5450 0.0089 1.6147 0.0141 0.0089 0.0 0.018 84 840 0.0057 0.0143 1.8530 0.5540 0.0090 1.6288 0.0141 0.0090 0.0 0.018 85 850 0.0057 0.0143 1.8673 0.5630 0.0090 1.6429 0.0141 0.0090 0.0 0.018 86 860 0.0057 0.0143 1.8815 0.5720 0.0090 1.6570 0.0141 0.0090 0.0 0.018 87 870 0.0057 0.0143 1.8958 0.5811 0.0091 1.6711 0.0141 0.0091 0.0 0.018 88 880 0.0057 0.0143 1.9100 0.5902 0.0091 1.6852 0.0141 0.0091 0.0 0.018 89 890 0.0050 0.0125 1.9225 0.5982 0.0080 1.6976 0.0124 0.0080 0.0 0.017 90 900 0.0050 0.0125 1.9350 0.6063 0.0081 1.7100 0.0124 0.0081 0.0 0.017 91 910 0.0050 0.0125 1.9475 0.6144 0.0081 1.7223 0.0124 0.0081 0.0 0.016 92 920 0.0050 0.0125 1.9600 0.6225 0.0081 1.7347 0.0124 0.0081 0.0 0.016 93 930 0.0050 0.0125 1.9725 0.6307 0.0082 1.7471 0.0124 0.0082 0.0 0.016 94 940 0.0050 0.0125 1.9850 0.6389 0.0082 1.7595 0.0124 0.0082 0.0 0.016 95 950 0.0050 0.0125 1.9975 0.6471 0.0082 1.7719 0.0124 0.0082 0.0 0.016 96 960 0.0050 0.0125 2.0100 0.6553 0.0082 1.7843 0.0124 0.0082 0.0 0.016 97 970 0.0050 0.0125 2.0225 0.6636 0.0083 1.7967 0.0124 0.0083 0.0 0.016 98 980 0.0050 0.0125 2.0350 0.6719 0.0083 1.8090 0.0124 0.0083 0.0 0.017 99 990 0.0050 0.0125 2.0475 0.6802 0.0083 1.8214 0.0124 0.0083 0.0 0.017 100 1000 0.0050 0.0125 2.0600 0.6885 0.0084 1.8338 0.0124 0.0084 0.0 0.017 101 1010 0.0040 0.0100 2.0700 0.6952 0.0067 1.8438 0.0099 0.0067 0.0 0.016 102 1020 0.0040 0.0100 2.0800 0.7020 0.0067 1.8537 0.0099 0.0067 0.0 0.014 103 1030 0.0040 0.0100 2.0900 0.7087 0.0067 1.8636 0.0099 0.0067 0.0 0.014 104 1040 0.0040 0.0100 2.1000 0.7154 0.0068 1.8735 0.0099 0.0068 0.0 0.014 105 1050 0.0040 0.0100 2.1100 0.7222 0.0068 1.8834 0.0099 0.0068 0.0 0.014 106 1060 0.0040 0.0100 2.1200 0.7290 0.0068 1.8933 0.0099 0.0068 0.0 0.014 107 1070 0.0040 0.0100 2.1300 0.7358 0.0068 1.9033 0.0099 0.0068 0.0 0.014 108 1080 0.0040 0.0100 2.1400 0.7426 0.0068 1.9132 0.0099 0.0068 0.0 0.014 109 1090 0.0040 0.0100 2.1500 0.7495 0.0068 1.9231 0.0099 0.0068 0.0 0.014 110 1100 0.0040 0.0100 2.1600 0.7563 0.0068 1.9330 0.0099 0.0068 0.0 0.014 111 1110 0.0040 0.0100 2.1700 0.7632 0.0069 1.9430 0.0099 0.0069 0.0 0.014 112 1120 0.0040 0.0100 2.1800 0.7701 0.0069 1.9529 0.0099 0.0069 0.0 0.014 113 1130 0.0040 0.0100 2.1900 0.7769 0.0069 1.9628 0.0099 0.0069 0.0 0.014 114 1140 0.0040 0.0100 2.2000 0.7839 0.0069 1.9727 0.0099 0.0069 0.0 0.014 115 1150 0.0040 0.0100 2.2100 0.7908 0.0069 1.9827 0.0099 0.0069 0.0 0.014 116 1160 0.0040 0.0100 2.2200 0.7977 0.0069 1.9926 0.0099 0.0069 0.0 0.014 117 1170 0.0040 0.0100 2.2300 0.8047 0.0070 2.0025 0.0099 0.0070 0.0 0.014 118 1180 0.0040 0.0100 2.2400 0.8117 0.0070 2.0124 0.0099 0.0070 0.0 0.014 119 1190 0.0040 0.0100 2.2500 0.8187 0.0070 2.0224 0.0099 0.0070 0.0 0.014 120 1200 0.0040 0.0100 2.2600 0.8257 0.0070 2.0323 0.0099 0.0070 0.0 0.014 121 1210 0.0040 0.0100 2.2700 0.8327 0.0070 2.0422 0.0099 0.0070 0.0 0.014 122 1220 0.0040 0.0100 2.2800 0.8397 0.0070 2.0521 0.0099 0.0070 0.0 0.014 123 1230 0.0040 0.0100 2.2900 0.8468 0.0070 2.0621 0.0099 0.0070 0.0 0.014 124 1240 0.0040 0.0100 2.3000 0.8538 0.0071 2.0720 0.0099 0.0071 0.0 0.014 125 1250 0.0040 0.0100 2.3100 0.8609 0.0071 2.0819 0.0099 0.0071 0.0 0.014 126 1260 0.0040 0.0100 2.3200 0.8680 0.0071 2.0919 0.0099 0.0071 0.0 0.014 127 1270 0.0040 0.0100 2.3300 0.8751 0.0071 2.1018 0.0099 0.0071 0.0 0.014 128 1280 0.0040 0.0100 2.3400 0.8822 0.0071 2.1117 0.0099 0.0071 0.0 0.014 129 1290 0.0040 0.0100 2.3500 0.8894 0.0071 2.1217 0.0099 0.0071 0.0 0.014 130 1300 0.0040 0.0100 2.3600 0.8965 0.0071 2.1316 0.0099 0.0071 0.0 0.014 131 1310 0.0040 0.0100 2.3700 0.9037 0.0072 2.1415 0.0099 0.0072 0.0 0.014 132 1320 0.0040 0.0100 2.3800 0.9109 0.0072 2.1515 0.0099 0.0072 0.0 0.014 133 1330 0.0040 0.0100 2.3900 0.9180 0.0072 2.1614 0.0099 0.0072 0.0 0.014 134 1340 0.0040 0.0100 2.4000 0.9252 0.0072 2.1714 0.0099 0.0072 0.0 0.014 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distil- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 135 1350 0.0040 0.0100 2.4100 0.9325 0.0072 2.1813 0.0099 0.0072 0.0 0.014 136 1360 0.0040 0.0100 2.4200 0.9397 0.0072 2.1912 0.0099 0.0072 0.0 0.014 137 1370 0.0040 0.0100 2.4300 0.9469 0.0072 2.2012 0.0099 0.0072 0.0 0.014 138 1380 0.0040 0.0100 2.4400 0.9542 0.0073 2.2111 0.0099 0.0073 0.0 0.014 139 1390 0.0040 0.0100 2.4500 0.9615 0.0073 2.2210 0.0099 0.0073 0.0 0.014 140 1400 0.0040 0.0100 2.4600 0.9687 0.0073 2.2310 0.0099 0.0073 0.0 0.015 141 1410 0.0040 0.0100 2.4700 0.9760 0.0073 2.2409 0.0099 0.0073 0.0 0.015 142 1420 0.0040 0.0100 2.4800 0.9834 0.0073 2.2509 0.0099 0.0073 0.0 0.015 143 1430 0.0040 0.0100 2.4900 0.9907 0.0073 2.2608 0.0099 0.0073 0.0 0.015 144 1440 0.0040 0.0100 2.5000 0.9980 0.0073 2.2707 0.0099 0.0073 0.0 0.015 Total Volume of Runoff= 1186.737 cu.ft. (Found by summing this column and multiplying by 600. 600 is the conversion required to convert SUM(Q)in cfs to total volume in cubic feet as follows: V=SUM(Q)x dt (cu.ft.)=(cu.ft/s)x(10 min.)x(60 s/min.) STORMWATER CALCULATION MATRIX-SANTA BARBARA HYDROGRAPGH METHOD Date: Sep-03 Given: Project= TWALITY-PARKING LOT Area = 0.33 acres Pt = 2.5 inches 2-Year/24 Hour Storm dt = 10 min. Tc = 5 min. (Post-Developed Site Conditions) PERVIOUS Parcel IMPERVIOUS Parcel Area = 0 acres Area = 0.33 acres CN = 82 CN = 98 S = 2.20 S = 0.20 0.2S = 0.44 0.2S = 0.04 Compute:Developed Conditions Runoff hydrograph Column(3)=SCS Type IA Rainfall Distribution Column(4)=Col. (3)x Pt= 10 year-24 Hour Hyetograph at this location. Column(5)=Accumulated Sum of Col. (4) Column(6)=[If P<=0.2S]=0; Note,use PERVIOUS Area"S"value. [If P>0.2S]_(Col.(5)-0.2S)^2/(Col.(5)+0.8S); Using the PERVIOUS Area"S"value. Column(7)=Col.(6)of Present Time Step-Col.(6)of Previous Time Step Column(8)=Same method as for Col.(6),except use the IMPERVIOUS Area"S"value. Column(9)=Col.(8)of the present time step-Col.(8)of the previous time step. Column(10)=((PERVIOUS area/Total area)x Col.(7))+((IMPERVIOUS area/Total area)x Col.(9)) Column(11)=(60.5 x Col.(10)x Total Area)/10(dt= 10 minutes) Routing Constant,w=dt/(2Tc+dt) = 0.5000 Column(12)=Col.(12)of Previous Time Step+(w x[Col.(11)of Previous Time Step +Col.(11)of Present Time Step-(2 x Col.(12)of Previous Time Step)]) Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. %of Pt in. in. in. in. in. in. in. cfs cfs 1 10 0.0040 0.0100 0.0100 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 2 20 0.0040 0.0100 0.0200 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 3 30 0.0040 0.0100 0.0300 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 4 40 0.0040 0.0100 0.0400 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 5 50 0.0040 0.0100 0.0500 0.0000 0.0000 0.0004 0.0004 0.0004 0.0 0.000 6 60 0.0040 0.0100 0.0600 0.0000 0.0000 0.0016 0.0013 0.0013 0.0 0.002 7 70 0.0040 0.0100 0.0700 0.0000 0.0000 0.0037 0.0020 0.0020 0.0 0.003 8 80 0.0040 0.0100 0.0800 0.0000 0.0000 0.0063 0.0027 0.0027 0.0 0.005 9 90 0.0040 0.0100 0.0900 0.0000 0.0000 0.0096 0.0032 0.0032 0.0 0.006 10 100 0.0040 0.0100 0.1000 0.0000 0.0000 0.0133 0.0038 0.0038 0.0 0.007 11 110 0.0050 0.0125 0.1125 0.0000 0.0000 0.0186 0.0053 0.0053 0.0 0.009 12 120 0.0050 0.0125 0.1250 0.0000 0.0000 0.0246 0.0060 0.0060 0.0 0.011 13 130 0.0050 0.0125 0.1375 0.0000 0.0000 0.0311 0.0065 0.0065 0.0 0.012 14 140 0.0050 0.0125 0.1500 0.0000 0.0000 0.0381 0.0070 0.0070 0.0 0.013 15 150 0.0050 0.0125 0.1625 0.0000 0.0000 0.0455 0.0074 0.0074 0.0 0.014 16 160 0.0050 0.0125 0.1750 0.0000 0.0000 0.0532 0.0078 0.0078 0.0 0.015 17 170 0.0060 0.0150 0.1900 0.0000 0.0000 0.0630 0.0098 0.0098 0.0 0.018 18 180 0.0060 0.0150 0.2050 0.0000 0.0000 0.0732 0.0102 0.0102 0.0 0.020 19 190 0.0060 0.0150 0.2200 0.0000 0.0000 0.0838 0.0106 0.0106 0.0 0.021 20 200 0.0060 0.0150 0.2350 0.0000 0.0000 0.0947 0.0109 0.0109 0.0 0.021 21 210 0.0060 0.0150 0.2500 0.0000 0.0000 0.1059 0.0112 0.0112 0.0 0.022 22 220 0.0060 0.0150 0.2650 0.0000 0.0000 0.1174 0.0115 0.0115 0.0 0.023 23 230 0.0070 0.0175 0.2825 0.0000 0.0000 0.1310 0.0137 0.0137 0.0 0.025 24 240 0.0070 0.0175 0.3000 0.0000 0.0000 0.1450 0.0140 0.0140 0.0 0.028 25 250 0.0070 0.0175 0.3175 0.0000 0.0000 0.1592 0.0142 0.0142 0.0 0.028 26 260 0.0070 0.0175 0.3350 0.0000 0.0000 0.1737 0.0145 0.0145 0.0 0.029 27 270 0.0070 0.0175 0.3525 0.0000 0.0000 0.1884 0.0147 0.0147 0.0 0.029 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 28 280 0.0070 0.0175 0.3700 0.0000 0.0000 0.2032 0.0148 0.0148 0.0 0.029 29 290 0.0082 0.0205 0.3905 0.0000 0.0000 0.2208 0.0176 0.0176 0.0 0.032 30 300 0.0082 0.0205 0.4110 0.0000 0.0000 0.2386 0.0178 0.0178 0.0 0.035 31 310 0.0082 0.0205 0.4315 0.0000 0.0000 0.2566 0.0180 0.0180 0.0 0.036 32 320 0.0082 0.0205 0.4520 0.0001 0.0001 0.2748 0.0182 0.0182 0.0 0.036 33 330 0.0082 0.0205 0.4725 0.0005 0.0004 0.2931 0.0183 0.0183 0.0 0.036 34 340 0.0082 0.0205 0.4930 0.0013 0.0008 0.3116 0.0185 0.0185 0.0 0.037 35 350 0.0095 0.0238 0.5168 0.0027 0.0014 0.3331 0.0215 0.0215 0.0 0.040 36 360 0.0095 0.0238 0.5405 0.0045 0.0018 0.3548 0.0217 0.0217 0.0 0.043 37 370 0.0095 0.0238 0.5643 0.0068 0.0023 0.3766 0.0218 0.0218 0.0 0.043 38 380 0.0095 0.0238 0.5880 0.0095 0.0027 0.3985 0.0219 0.0219 0.0 0.044 39 390 0.0095 0.0238 0.6118 0.0126 0.0031 0.4206 0.0221 0.0221 0.0 0.044 40 400 0.0095 0.0238 0.6355 0.0161 0.0035 0.4427 0.0222 0.0222 0.0 0.044 41 410 0.0134 0.0335 0.6690 0.0218 0.0057 0.4741 0.0314 0.0314 0.1 0.053 42 420 0.0134 0.0335 0.7025 0.0282 0.0064 0.5057 0.0316 0.0316 0.1 0.063 43 430 0.0134 0.0335 0.7360 0.0354 0.0072 0.5374 0.0317 0.0317 0.1 0.063 44 440 0.0180 0.0450 0.7810 0.0461 0.0107 0.5802 0.0428 0.0428 0.1 0.074 45 450 0.0180 0.0450 0.8260 0.0580 0.0119 0.6232 0.0430 0.0430 0.1 0.086 46 460 0.0340 0.0850 0.9110 0.0835 0.0255 0.7049 0.0817 0.0817 0.2 0.124 47 470 0.0540 0.1350 1.0460 0.1315 0.0480 0.8355 0.1307 0.1307 0.3 2 48 480 0.0270 0.0675 1.1135 0.1585 0.0271 0.9012 0.0657 0.0657 0.1 0.196 Q 49 490 0.0180 0.0450 1.1585 0.1776 0.0191 0.9451 0.0439 0.0439 0.1 . 50 500 0.0134 0.0335 1.1920 0.1923 0.0147 0.9778 0.0327 0.0327 0.1 0.076 liZnAil1 LA 51 510 0.0134 0.0335 1.2255 0.2075 0.0151 1.0106 0.0328 0.0328 0.1 0.065 n pA 52 520 0.0134 0.0335 1.2590 0.2230 0.0155 1.0434 0.0328 0.0328 0.1 0.065 '�'O , 53 530 0.0088 0.0220 1.2810 0.2334 0.0104 1.0649 0.0216 0.0216 0.0 0.054 54 540 0.0088 0.0220 1.3030 0.2440 0.0106 1.0865 0.0216 0.0216 0.0 0.043 55 550 0.0088 0.0220 1.3250 0.2548 0.0108 1.1081 0.0216 0.0216 0.0 0.043 56 560 0.0088 0.0220 1.3470 0.2657 0.0109 1.1297 0.0216 0.0216 0.0 0.043 57 570 0.0088 0.0220 1.3690 0.2767 0.0111 1.1513 0.0216 0.0216 0.0 0.043 58 580 0.0088 0.0220 1.3910 0.2880 0.0112 1.1729 0.0216 0.0216 0.0 0.043 59 590 0.0088 0.0220 1.4130 0.2993 0.0114 1.1945 0.0216 0.0216 0.0 0.043 60 600 0.0088 0.0220 1.4350 0.3109 0.0115 1.2162 0.0216 0.0216 0.0 0.043 61 610 0.0088 0.0220 1.4570 0.3225 0.0117 1.2378 0.0216 0.0216 0.0 0.043 62 620 0.0088 0.0220 1.4790 0.3343 0.0118 1.2595 0.0217 0.0217 0.0 0.043 63 630 0.0088 0.0220 1.5010 0.3463 0.0119 1.2811 0.0217 0.0217 0.0 0.043 64 640 0.0088 0.0220 1.5230 0.3583 0.0121 1.3028 0.0217 0.0217 0.0 0.043 65 650 0.0072 0.0180 1.5410 0.3683 0.0100 1.3205 0.0177 0.0177 0.0 0.039 66 660 0.0072 0.0180 1.5590 0.3784 0.0101 1.3383 0.0177 0.0177 0.0 0.035 67 670 0.0072 0.0180 1.5770 0.3885 0.0102 1.3560 0.0177 0.0177 0.0 0.035 68 680 0.0072 0.0180 1.5950 0.3988 0.0102 1.3738 0.0178 0.0178 0.0 0.035 69 690 0.0072 0.0180 1.6130 0.4091 0.0103 1.3915 0.0178 0.0178 0.0 0.035 70 700 0.0072 0.0180 1.6310 0.4195 0.0104 1.4093 0.0178 0.0178 0.0 0.035 71 710 0.0072 0.0180 1.6490 0.4300 0.0105 1.4271 0.0178 0.0178 0.0 0.035 72 720 0.0072 0.0180 1.6670 0.4405 0.0106 1.4449 0.0178 0.0178 0.0 0.035 73 730 0.0072 0.0180 1.6850 0.4512 0.0106 1.4626 0.0178 0.0178 0.0 0.035 74 740 0.0072 0.0180 1.7030 0.4619 0.0107 1.4804 0.0178 0.0178 0.0 0.035 75 750 0.0072 0.0180 1.7210 0.4727 0.0108 1.4982 0.0178 0.0178 0.0 0.036 76 760 0.0072 0.0180 1.7390 0.4835 0.0109 1.5160 0.0178 0.0178 0.0 0.036 77 770 0.0057 0.0143 1.7533 0.4922 0.0087 1.5301 0.0141 0.0141 0.0 0.032 78 780 0.0057 0.0143 1.7675 0.5009 0.0087 1.5442 0.0141 0.0141 0.0 0.028 79 790 0.0057 0.0143 1.7818 0.5096 0.0087 1.5583 0.0141 0.0141 0.0 0.028 80 800 0.0057 0.0143 1.7960 0.5184 0.0088 1.5724 0.0141 0.0141 0.0 0.028 81 810 0.0057 0.0143 1.8103 0.5272 0.0088 1.5865 0.0141 0.0141 0.0 0.028 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 82 820 0.0057 0.0143 1.8245 0.5361 0.0089 1.6006 0.0141 0.0141 0.0 0.028 83 830 0.0057 0.0143 1.8388 0.5450 0.0089 1.6147 0.0141 0.0141 0.0 0.028 84 840 0.0057 0.0143 1.8530 0.5540 0.0090 1.6288 0.0141 0.0141 0.0 0.028 85 850 0.0057 0.0143 1.8673 0.5630 0.0090 1.6429 0.0141 0.0141 0.0 0.028 86 860 0.0057 0.0143 1.8815 0.5720 0.0090 1.6570 0.0141 0.0141 0.0 0.028 87 870 0.0057 0.0143 1.8958 0.5811 0.0091 1.6711 0.0141 0.0141 0.0 0.028 88 880 0.0057 0.0143 1.9100 0.5902 0.0091 1.6852 0.0141 0.0141 0.0 0.028 89 890 0.0050 0.0125 1.9225 0.5982 0.0080 1.6976 0.0124 0.0124 0.0 0.026 90 900 0.0050 0.0125 1.9350 0.6063 0.0081 1.7100 0.0124 0.0124 0.0 0.025 91 910 0.0050 0.0125 1.9475 0.6144 0.0081 1.7223 0.0124 0.0124 0.0 0.025 92 920 0.0050 0.0125 1.9600 0.6225 0.0081 1.7347 0.0124 0.0124 0.0 0.025 93 930 0.0050 0.0125 1.9725 0.6307 0.0082 1.7471 0.0124 0.0124 0.0 0.025 94 940 0.0050 0.0125 1.9850 0.6389 0.0082 1.7595 0.0124 0.0124 0.0 0.025 95 950 0.0050 0.0125 1.9975 0.6471 0.0082 1.7719 0.0124 0.0124 0.0 0.025 96 960 0.0050 0.0125 2.0100 0.6553 0.0082 1.7843 0.0124 0.0124 0.0 0.025 97 970 0.0050 0.0125 2.0225 0.6636 0.0083 1.7967 0.0124 0.0124 0.0 0.025 98 980 0.0050 0.0125 2.0350 0.6719 0.0083 1.8090 0.0124 0.0124 0.0 0.025 99 990 0.0050 0.0125 2.0475 0.6802 0.0083 1.8214 0.0124 0.0124 0.0 0.025 100 1000 0.0050 0.0125 2.0600 0.6885 0.0084 1.8338 0.0124 0.0124 0.0 0.025 101 1010 0.0040 0.0100 2.0700 0.6952 0.0067 1.8438 0.0099 0.0099 0.0 0.022 102 1020 0.0040 0.0100 2.0800 0.7020 0.0067 1.8537 0.0099 0.0099 0.0 0.020 103 1030 0.0040 0.0100 2.0900 0.7087 0.0067 1.8636 0.0099 0.0099 0.0 0.020 104 1040 0.0040 0.0100 2.1000 0.7154 0.0068 1.8735 0.0099 0.0099 0.0 0.020 105 1050 0.0040 0.0100 2.1100 0.7222 0.0068 1.8834 0.0099 0.0099 0.0 0.020 106 1060 0.0040 0.0100 2.1200 0.7290 0.0068 1.8933 0.0099 0.0099 0.0 0.020 107 1070 0.0040 0.0100 2.1300 0.7358 0.0068 1.9033 0.0099 0.0099 0.0 0.020 108 1080 0.0040 0.0100 2.1400 0.7426 0.0068 1.9132 0.0099 0.0099 0.0 0.020 109 1090 0.0040 0.0100 2.1500 0.7495 0.0068 1.9231 0.0099 0.0099 0.0 0.020 110 1100 0.0040 0.0100 2.1600 0.7563 0.0068 1.9330 0.0099 0.0099 0.0 0.020 111 1110 0.0040 0.0100 2.1700 0.7632 0.0069 1.9430 0.0099 0.0099 0.0 0.020 112 1120 0.0040 0.0100 2.1800 0.7701 0.0069 1.9529 0.0099 0.0099 0.0 0.020 113 1130 0.0040 0.0100 2.1900 0.7769 0.0069 1.9628 0.0099 0.0099 0.0 0.020 114 1140 0.0040 0.0100 2.2000 0.7839 0.0069 1.9727 0.0099 0.0099 0.0 0.020 115 1150 0.0040 0.0100 2.2100 0.7908 0.0069 1.9827 0.0099 0.0099 0.0 0.020 116 1160 0.0040 0.0100 2.2200 0.7977 0.0069 1.9926 0.0099 0.0099 0.0 0.020 117 1170 0.0040 0.0100 2.2300 0.8047 0.0070 2.0025 0.0099 0.0099 0.0 0.020 118 1180 0.0040 0.0100 2.2400 0.8117 0.0070 2.0124 0.0099 0.0099 0.0 0.020 119 1190 0.0040 0.0100 2.2500 0.8187 0.0070 2.0224 0.0099 0.0099 0.0 0.020 120 1200 0.0040 0.0100 2.2600 0.8257 0.0070 2.0323 0.0099 0.0099 0.0 0.020 121 1210 0.0040 0.0100 2.2700 0.8327 0.0070 • 2.0422 0.0099 0.0099 0.0 0.020 122 1220 0.0040 0.0100 2.2800 0.8397 0.0070 2.0521 0.0099 0.0099 0.0 0.020 123 1230 0.0040 0.0100 2.2900 0.8468 0.0070 2.0621 0.0099 0.0099 0.0 0.020 124 1240 0.0040 0.0100 2.3000 0.8538 0.0071 2.0720 0.0099 0.0099 0.0 0.020 125 1250 0.0040 0.0100 2.3100 0.8609 0.0071 2.0819 0.0099 0.0099 0.0 0.020 126 1260 0.0040 0.0100 2.3200 0.8680 0.0071 2.0919 0.0099 0.0099 0.0 0.020 127 1270 0.0040 0.0100 2.3300 0.8751 0.0071 2.1018 0.0099 0.0099 0.0 0.020 128 1280 0.0040 0.0100 2.3400 0.8822 0.0071 2.1117 0.0099 0.0099 0.0 0.020 129 1290 0.0040 0.0100 2.3500 0.8894 0.0071 2.1217 0.0099 0.0099 0.0 0.020 130 1300 0.0040 0.0100 2.3600 0.8965 0.0071 2.1316 0.0099 0.0099 0.0 0.020 131 1310 0.0040 0.0100 2.3700 0.9037 0.0072 2.1415 0.0099 0.0099 0.0 0.020 132 1320 0.0040 0.0100 2.3800 0.9109 0.0072 2.1515 0.0099 0.0099 0.0 0.020 133 1330 0.0040 0.0100 2.3900 0.9180 0.0072 2.1614 0.0099 0.0099 0.0 0.020 134 1340 0.0040 0.0100 2.4000 0.9252 0.0072 2.1714 0.0099 0.0099 0.0 0.020 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 135 1350 0.0040 0.0100 2.4100 0.9325 0.0072 2.1813 0.0099 0.0099 0.0 0.020 136 1360 0.0040 0.0100 2.4200 0.9397 0.0072 2.1912 0.0099 0.0099 0.0 0.020 137 1370 0.0040 0.0100 2.4300 0.9469 0.0072 2.2012 0.0099 0.0099 0.0 0.020 138 1380 0.0040 0.0100 2.4400 0.9542 0.0073 2.2111 0.0099 0.0099 0.0 0.020 139 1390 0.0040 0.0100 2.4500 0.9615 0.0073 2.2210 0.0099 0.0099 0.0 0.020 140 1400 0.0040 0.0100 2.4600 0.9687 0.0073 2.2310 0.0099 0.0099 0.0 0.020 141 1410 0.0040 0.0100 2.4700 0.9760 0.0073 2.2409 0.0099 0.0099 0.0 0.020 142 1420 0.0040 0.0100 2.4800 0.9834 0.0073 2.2509 0.0099 0.0099 0.0 0.020 143 1430 0.0040 0.0100 2.4900 0.9907 0.0073 2.2608 0.0099 0.0099 0.0 0.020 144 1440 0.0040 0.0100 2.5000 0.9980 0.0073 2.2707 0.0099 0.0099 0.0 0.020 Total Volume of Runoff= 2714.166 cu.ft. (Found by summing this column and multiplying by 600. 600 is the conversion required to convert SUM(Q)in cfs to total volume in cubic feet as follows: V=SUM(Q)x dt (cu.ft.)=(cu.ftls)x(10 min.)x(60 s/min.) STORMWATER CALCULATION MATRIX-SANTA BARBARA HYDROGRAPGH METHOD Date: 37868.00 Given: Project= TWALITY PARKING LOT Average Pond Length(ft)= 20.000 Average Pond Width(ft)= 15.000 Orifice Diameter(ft)= 0.125 • y Orifice Area= 0.012 SF Avg Pond Area= 300.000 SF Column(3)=Col A:L"600=Incremental CFS into Pond Column(4)=Starting Pond Depth=Previous Remaining Pond Depth=Col(11) Column(5)= Column(6)=2*g*Starting h Column(7)=Square Root of 2gh Column(8)= Incremental Vol out=Col(7)*0.60*Orifice Area'600 Column(9)=Delta Vol=Incremental Vol in- Incremental Vol out=Col(3)-Col(8) Column(10)=Remaining Pond Vol=Previous Remaining Vol+Col(9) Column(11)= Column(12)= (1) (2) (3) (4) (6) (7) (8) (9) (10) (11) (12) Time Time Increm. Starting Increm. Delta Remain Remain CFS Increm. Vol into Pond Vol out Vol Total Pond Discharge Pond Depth Pond Vol Depth min. cf ft. cf cf in. ft 1 10 0.00 0.000 0.000 0.000 0.000 0.00 0.0 0.000 0.00 2 20 0.00 0.000 0.000 0.000 0.000 0.00 0.0 0.000 0.00 3 30 0.00 0.000 0.000 0.000 0.000 0.00 0.0 0.000 0.00 4 40 0.00 0.000 0.000 0.000 0.000 0.00 0.0 0.000 0.00 5 50 0.24 0.000 0.000 0.000 0.000 0.24 0.2 0.001 0.00 6 60 0.99 0.001 0.051 0.225 0.996 -0.01 0.2 0.001 0.00 7 70 1.95 0.001 0.049 0.221 0.977 0.97 1.2 0.004 0.00 8 80 2.79 0.004 0.258 0.508 2.243 0.55 1.8 0.006 0.00 9 90 3.53 0.006 0.376 0.613 2.708 0.83 2.6 0.009 0.00 10 100 4.19 0.009 0.553 0.744 3.285 0.90 3.5 0.012 0.01 11 110 5.44 0.012 0.747 0.864 3.818 1.62 5.1 0.017 0.01 12 120 6.76 0.017 1.095 1.046 4.623 2.13 7.2 0.024 0.01 13 130 7.45 0.024 1.553 1.246 5.505 1.95 9.2 0.031 0.01 14 140 8.07 0.031 1.971 1.404 6.203 1.86 11.0 0.037 0.01 15 150 8.61 0.037 2.372 1.540 6.804 1.81 12.9 0.043 0.01 16 160 9.09 0.043 2.759 1.661 7.338 1.75 14.6 0.049 0.01 17 170 10.51 0.049 3.135 1.771 7.822 2.69 17.3 0.058 0.01 18 180 11.96 0.058 3.712 1.927 8.512 3.45 20.7 0.069 0.01 19 190 12.44 0.069 4.452 2.110 9.322 3.12 23.9 0.080 0.02 20 200 12.87 0.080 5.122 2.263 9.998 2.87 26.7 0.089 0.02 21 210 13.24 0.089 5.737 2.395 10.582 2.66 29.4 0.098 0.02 22 220 13.58 0.098 6.309 2.512 11.097 2.48 31.9 0.106 0.02 23 230 15.06 0.106 6.842 2.616 11.556 3.51 35.4 0.118 0.02 24 240 16.56 0.118 7.595 2.756 12.176 4.39 39.8 0.133 0.02 25 250 16.89 0.133 8.537 2.922 12.908 3.98 43.7 0.146 0.02 26 260 17.18 0.146 9.392 3.065 13.539 3.64 47.4 0.158 0.02 27 270 17.44 0.158 10.173 3.190 14.091 3.35 50.7 0.169 0.02 • (1) (2) Time Time Increment Jb" min. $1() 28 280 17.68 0.169 10.893 3.300 14.581 3.10 53.8 0.179 0.02 29 290 19.44 0.179 11.557 3.400 15.019 4.42 58.3 0.194 0.03 30 300 21.22 0.194 12.507 3.536 15.624 5.59 63.9 0.213 0.03 31 310 21.45 0.213 13.707 3.702 16.357 5.10 68.9 0.230 0.03 32 320 21.66 0.230 14.801 3.847 16.997 4.67 73.6 0.245 0.03 33 330 21.85 0.245 15.803 3.975 17.562 4.29 77.9 0.260 0.03 34 340 22.02 0.260 16.724 4.089 18.067 3.96 81.9 0.273 0.03 35 350 23.95 0.273 17.573 4.192 18.520 5.43 87.3 0.291 0.03 36 360 25.88 0.291 18.739 4.329 19.124 6.76 94.1 0.314 0.03 37 370 26.05 0.314 20.190 4.493 19.851 6.20 100.3 0.334 0.03 38 380 26.21 0.334 21.522 4.639 20.495 5.71 106.0 0.353 0.03 39 390 26.35 0.353 22.748 4.770 21.071 5.28 111.2 0.371 0.04 40 400 26.48 0.371 23.881 4.887 21.589 4.89 116.1 0.387 0.04 41 410 32.08 0.387 24.930 4.993 22.058 10.02 126.2 0.421 0.04 42 420 37.71 0.421 27.081 5.204 22.990 14.72 140.9 0.470 0.04 43 430 37.90 0.470 30.241 5.499 24.295 13.60 154.5 0.515 0.04 44 440 44.62 0.515 33.161 5.759 25.441 19.18 173.7 0.579 0.04 45 450 51.38 0.579 37.278 6.106 26.974 24.41 198.1 0.660 0.04 46 460 74.67 0.660 42.518 6.521 28.807 45.86 243.9 0.813 0.05 47 470 127.18 0.813 52.363 7.236 31.969 95.21 339.1 1.130 0.05 48 480 117.60 1.130 72.802 8.532 37.695 79.91 419.0 1.397 0.06 49 490 65.63 1.397 89.955 9.484 41.901 23.72 : 1.476 - 0.07 50 500 45.89 1.476 95.048 9.749 43.071 2.81 445.6 1.4 0.07 51 510 39.22 1.485 95.653 9.780 43.208 -3.99 . 1.472 0.07 4 52 520 39.26 1.472 94.796 9.736 43.014 -3.75 437.8 1.459 0.07 53 530 32.55 1.459 93.991 9.695 42.831 -10.28 427.6 1.425 0.07 54 540 25.83 1.425 91.784 9.580 42.325 -16.50 411.1 1.370 0.07 55 550 25.84 1.370 88.243 9.394 41.501 -15.66 395.4 1.318 0.07 56 560 25.86 1.318 84.882 9.213 40.702 -14.84 380.6 1.269 0.07 57 570 25.87 1.269 81.695 9.039 39.931 -14.06 366.5 1.222 0.07 58 580 25.89 1.222 78.677 8.870 39.187 -13.30 353.2 1.177 0.07 59 590 25.90 1.177 75.822 8.708 38.469 -12.57 340.6 1.135 0.06 60 600 25.91 1.135 73.124 8.551 37.778 -11.87 328.8 1.096 0.06 61 610 25.92 1.096 70.577 8.401 37.114 -11.19 317.6 1.059 0.06 62 620 25.94 1.059 68.174 8.257 36.477 -10.54 307.0 1.023 0.06 63 630 25.95 1.023 65.911 8.119 35.867 -9.92 297.1 0.990 0.06 64 640 25.96 0.990 63.782 7.986 35.283 -9.33 287.8 0.959 0.06 65 650 23.61 0.959 61.780 7.860 34.725 -11.12 276.7 0.922 0.06 66 660 21.25 0.922 59.393 7.707 34.047 -12.79 263.9 0.880 0.06 67 670 21.26 0.880 56.647 7.526 33.251 -11.99 251.9 0.840 0.06 68 680 21.27 0.840 54.073 7.353 32.486 -11.22 240.7 0.802 0.05 69 690 21.27 0.802 51.664 7.188 31.755 -10.48 230.2 0.767 0.05 70 700 21.28 0.767 49.414 7.029 31.055 -9.78 220.4 0.735 0.05 71 710 21.28 0.735 47.315 6.879 30.389 -9.11 211.3 0.704 0.05 72 720 21.29 0.704 45.360 6.735 29.754 -8.47 202.8 0.676 0.05 73 730 21.29 0.676 43.543 6.599 29.152 -7.86 195.0 0.650 0.05 74 740 21.30 0.650 41.856 6.470 28.582 -7.28 187.7 0.626 0.05 75 750 21.30 0.626 40.292 6.348 28.043 -6.74 181.0 0.603 0.05 76 760 21.31 0.603 38.846 6.233 27.535 -6.23 174.7 0.582 0.05 77 770 19.09 0.582 37.509 6.124 27.057 -7.96 166.8 0.556 0.05 78 780 16.88 0.556 35.800 5.983 26.433 -9.56 157.2 0.524 0.04 79 790 16.88 0.524 33.748 5.809 25.665 -8.79 148.4 0.495 0.04 80 800 16.88 0.495 31.862 5.645 24.937 -8.06 140.4 0.468 0.04 81 810 16.88 0.468 30.133 5.489 24.251 -7.37 133.0 0.443 0.04 . J (1) (2) Time Time Increment min. 82 820 16.89 0.000 30.133 5.489 24.251 -7.36 125.6 0.419 • 83 830 16.89 0.419 26.971 5.193 22.944 -6.05 119.6 0.399 84 840 16.89 0.399 25.672 5.067 22.384 -5.49 114.1 0.380 85 850 16.90 0.380 24.493 4.949 21.864 -4.97 109.1 0.364 86 860 16.90 0.364 23.426 4.840 21.383 -4.49 104.6 0.349 87 870 16.90 0.349 22.463 4.740 20.939 -4.04 100.6 0.335 88 880 16.90 0.335 21.596 4.647 20.531 -3.63 97.0 0.323 89 890 15.87 0.323 20.817 4.563 20.157 -4.29 92.7 0.309 90 900 14.83 0.309 19.896 4.461 19.706 -4.88 87.8 0.293 91 910 14.83 0.293 18.850 4.342 19.181 -4.35 83.5 0.278 92 920 14.83 0.278 17.916 4.233 18.700 -3.87 79.6 0.265 93 930 14.84 0.265 17.086 4.134 18.262 -3.43 76.2 0.254 94 940 14.84 0.254 16.351 4.044 17.864 -3.03 73.1 0.244 95 950 14.84 0.244 15.701 3.962 17.506 -2.67 70.5 0.235 96 960 14.84 0.235 15.128 3.890 17.183 -2.34 68.1 0.227 97 970 14.84 0.227 14.625 3.824 16.895 -2.05 66.1 0.220 98 980 14.84 0.220 14.185 3.766 16.639 -1.80 64.3 0.214 99 990 14.84 0.214 13.799 3.715 16.411 -1.57 62.7 0.209 100 1000 14.85 0.209 13.463 3.669 16.210 -1.36 61.4 0.205 101 1010 13.36 0.205 13.170 3.629 16.033 -2.67 58.7 0.196 102 1020 11.88 0.196 12.597 3.549 15.680 -3.80 54.9 0.183 103 1030 11.88 0.183 11.781 3.432 15.164 -3.28 51.6 0.172 104 1040 11.88 0.172 11.076 3.328 14.703 -2.82 48.8 0.163 105 1050 11.88 0.163 10.470 3.236 14.295 -2.41 46.4 0.155 106 1060 11.88 0.155 9.952 3.155 13.937 -2.05 44.3 0.148 107 1070 11.88 0.148 9.511 3.084 13.625 -1.74 42.6 0.142 108 1080 11.88 0.142 9.137 3.023 13.354 -1.47 41.1 0.137 109 1090 11.88 0.137 8.822 2.970 13.122 -1.24 39.9 0.133 110 1100 11.89 0.133 8.556 2.925 12.923 -1.04 38.8 0.129 111 1110 11.89 0.129 8.334 2.887 12.753 -0.87 38.0 0.127 112 1120 11.89 0.127 8.147 2.854 12.610 -0.72 37.2 0.124 113 1130 11.89 0.124 7.992 2.827 12.490 -0.60 36.6 0.122 114 1140 11.89 0.122 7.863 2.804 12.388 -0.50 36.1 0.120 115 1150 11.89 0.120 7.756 2.785 12.304 -0.41 35.7 0.119 116 1160 11.89 0.119 7.667 2.769 12.233 -0.34 35.4 0.118 117 1170 11.89 0.118 7.594 2.756 12.174 -0.28 35.1 0.117 118 1180 11.89 0.117 7.533 2.745 12.125 -0.23 34.9 0.116 119 1190 11.89 0.116 7.483 2.735 12.085 -0.19 34.7 0.116 120 1200 11.89 0.116 7.441 2.728 12.052 -0.16 34.5 0.115 121 1210 11.89 0.115 7.407 2.722 12.024 -0.13 34.4 0.115 122 1220 11.89 0.115 7.380 2.717 12.001 -0.11 34.3 0.114 123 1230 11.90 0.114 7.357 2.712 11.983 -0.09 34.2 0.114 124 1240 11.90 0.114 7.338 2.709 11.967 -0.07 34.1 0.114 125 1250 11.90 0.114 7.323 2.706 11.955 -0.06 34.1 0.114 126 1260 11.90 0.114 7.310 2.704 11.945 -0.05 34.0 0.113 127 1270 11.90 0.113 7.300 2.702 11.936 -0.04 34.0 0.113 128 1280 11.90 0.113 7.292 2.700 11.930 -0.03 33.9 0.113 129 1290 11.90 0.113 7.285 2.699 11.924 -0.02 33.9 0.113 130 1300 11.90 0.113 7.280 2.698 11.920 -0.02 33.9 0.113 131 1310 11.90 0.113 7.276 2.697 11.916 -0.02 33.9 0.113 132 1320 11.90 0.113 7.272 2.697 11.914 -0.01 33.9 0.113 133 1330 11.90 0.113 7.269 2.696 11.911 -0.01 33.9 0.113 134 1340 11.90 0.113 7.267 2.696 11.910 -0.01 33.8 0.113 (1) (2) Time Time Increment min. 135 1350 11.90 0.113 7.266 2.696 11.908 -0.01 33.8 0.113 136 1360 11.90 0.113 7.265 2.695 11.908 -0.00 33.8 0.113 137 1370 11.90 0.113 7.264 2.695 11.907 -0.00 33.8 0.113 138 1380 11.90 0.113 7.263 2.695 11.906 -0.00 33.8 0.113 139 1390 11.91 0.113 7.263 2.695 11.906 -0.00 33.8 0.113 140 1400 11.91 0.113 7.263 2.695 11.906 -0.00 33.8 0.113 141 1410 11.91 0.113 7.263 2.695 11.906 0.00 33.8 0.113 142 1420 11.91 0.113 7.263 2.695 11.906 0.00 33.8 0.113 143 1430 11.91 0.113 7.263 2.695 11.906 0.00 33.8 0.113 144 1440 11.91 0.113 7.263 2.695 11.906 0.00 33.8 0.113 2714.17 STORMWATER CALCULATION MATRIX-SANTA BARBARA HYDROGRAPGH METHOD Date: Sep-03 Given: Project= TWALITY-PARKING LOT Area = 0.33 acres Pt = 3.45 inches 10-Year/24 Hour Storm dt = 10 min. Tc = 10 min. (Pre-Developed Site Conditions) PERVIOUS Parcel IMPERVIOUS Parcel Area = 0.33 acres Area = 0 acres CN = 82 CN = 98 S = 2.20 S = 0.20 0.2S = 0.44 0.2S = 0.04 Compute:Developed Conditions Runoff hydrograph Column(3)=SCS Type IA Rainfall Distribution Column(4)=Col. (3)x Pt= 10 year-24 Hour Hyetograph at this location. Column(5)=Accumulated Sum of Col. (4) Column(6)=[If P<=0.2S]=0; Note, use PERVIOUS Area"S"value. [If P>0.2S]=(Col.(5)-0.2S)^2/(Col.(5)+0.8S); Using the PERVIOUS Area"S"value. Column(7)=Col.(6)of Present Time Step-Col.(6)of Previous Time Step Column(8)=Same method as for Col.(6),except use the IMPERVIOUS Area"S"value. Column(9)=Col.(8)of the present time step-Col.(8)of the previous time step. Column(10)=((PERVIOUS area/Total area)x Col.(7))+((IMPERVIOUS area/Total area)x Col.(9)) Column(11)=(60.5 x Col.(10)x Total Area)/10(dt= 10 minutes) Routing Constant,w=dt/(2Tc+dt) = 0.3333 Column(12)=Col.(12)of Previous Time Step+(w x[Col.(11)of Previous Time Step +Col.(11)of Present Time Step-(2 x Col.(12)of Previous Time Step)]) Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. %of Pt in. in. in. in. in. in. in. cfs cfs 1 10 0.0040 0.0138 0.0138 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 2 20 0.0040 0.0138 0.0276 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 3 30 0.0040 0.0138 0.0414 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 4 40 0.0040 0.0138 0.0552 0.0000 0.0000 0.0009 0.0009 0.0000 0.0 0.000 5 50 0.0040 0.0138 0.0690 0.0000 0.0000 0.0034 0.0025 0.0000 0.0 0.000 6 60 0.0040 0.0138 0.0828 0.0000 0.0000 0.0072 0.0037 0.0000 0.0 0.000 7 70 0.0040 0.0138 0.0966 0.0000 0.0000 0.0120 0.0048 0.0000 0.0 0.000 8 80 0.0040 0.0138 0.1104 0.0000 0.0000 0.0177 0.0057 0.0000 0.0 0.000 9 90 0.0040 0.0138 0.1242 0.0000 0.0000 0.0242 0.0065 0.0000 0.0 0.000 10 100 0.0040 0.0138 0.1380 0.0000 0.0000 0.0313 0.0072 0.0000 0.0 0.000 11 110 0.0050 0.0173 0.1553 0.0000 0.0000 0.0411 0.0098 0.0000 0.0 0.000 12 120 0.0050 0.0173 0.1725 0.0000 0.0000 0.0516 0.0105 0.0000 0.0 0.000 13 130 0.0050 0.0173 0.1898 0.0000 0.0000 0.0628 0.0112 0.0000 0.0 0.000 14 140 0.0050 0.0173 0.2070 0.0000 0.0000 0.0746 0.0118 0.0000 0.0 0.000 15 150 0.0050 0.0173 0.2243 0.0000 0.0000 0.0868 0.0122 0.0000 0.0 0.000 16 160 0.0050 0.0173 0.2415 0.0000 0.0000 0.0995 0.0127 0.0000 0.0 0.000 17 170 0.0060 0.0207 0.2622 0.0000 0.0000 0.1152 0.0157 0.0000 0.0 0.000 18 180 0.0060 0.0207 0.2829 0.0000 0.0000 0.1314 0.0162 0.0000 0.0 0.000 19 190 0.0060 0.0207 0.3036 0.0000 0.0000 0.1479 0.0166 0.0000 0.0 0.000 20 200 0.0060 0.0207 0.3243 0.0000 0.0000 0.1648 0.0169 0.0000 0.0 0.000 21 210 0.0060 0.0207 0.3450 0.0000 0.0000 0.1820 0.0172 0.0000 0.0 0.000 22 220 0.0060 0.0207 0.3657 0.0000 0.0000 0.1995 0.0175 0.0000 0.0 0.000 23 230 0.0070 0.0242 0.3899 0.0000 0.0000 0.2203 0.0207 0.0000 0.0 0.000 24 240 0.0070 0.0242 0.4140 0.0000 0.0000 0.2413 0.0210 0.0000 0.0 0.000 25 250 0.0070 0.0242 0.4382 0.0000 0.0000 0.2625 0.0213 0.0000 0.0 0.000 26 260 0.0070 0.0242 0.4623 0.0002 0.0002 0.2840 0.0215 0.0002 0.0 0.000 27 270 0.0070 0.0242 0.4865 0.0010 0.0008 0.3057 0.0217 0.0008 0.0 0.001 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated fated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 28 280 0.0070 0.0242 0.5106 0.0023 0.0013 0.3275 0.0219 0.0013 0.0 0.002 29 290 0.0082 0.0283 0.5389 0.0043 0.0021 0.3533 0.0258 0.0021 0.0 0.003 30 300 0.0082 0.0283 0.5672 0.0071 0.0027 0.3793 0.0260 0.0027 0.0 0.004 31 310 0.0082 0.0283 0.5955 0.0104 0.0033 0.4055 0.0262 0.0033 0.0 0.005 32 320 0.0082 0.0283 0.6238 0.0143 0.0039 0.4318 0.0263 0.0039 0.0 0.007 33 330 0.0082 0.0283 0.6521 0.0188 0.0045 0.4582 0.0265 0.0045 0.0 0.008 34 340 0.0082 0.0283 0.6803 0.0239 0.0051 0.4848 0.0266 0.0051 0.0 0.009 35 350 0.0095 0.0328 0.7131 0.0304 0.0065 0.5157 0.0309 0.0065 0.0 0.011 36 360 0.0095 0.0328 0.7459 0.0376 0.0072 0.5468 0.0311 0.0072 0.0 0.013 37 370 0.0095 0.0328 0.7787 0.0455 0.0079 0.5780 0.0312 0.0079 0.0 0.014 38 380 0.0095 0.0328 0.8114 0.0540 0.0085 0.6093 0.0313 0.0085 0.0 0.016 39 390 0.0095 0.0328 0.8442 0.0631 0.0091 0.6407 0.0314 0.0091 0.0 0.017 40 400 0.0095 0.0328 0.8770 0.0728 0.0097 0.6721 0.0315 0.0097 0.0 0.018 41 410 0.0134 0.0462 0.9232 0.0875 0.0147 0.7167 0.0445 0.0147 0.0 0.022 42 420 0.0134 0.0462 0.9695 0.1032 0.0157 0.7613 0.0447 0.0157 0.0 0.028 43 430 0.0134 0.0462 1.0157 0.1200 0.0167 0.8061 0.0448 0.0167 0.0 0.031 44 440 0.0180 0.0621 1.0778 0.1440 0.0240 0.8664 0.0603 0.0240 0.0 0.037 45 450 0.0180 0.0621 1.1399 0.1696 0.0256 0.9269 0.0605 0.0256 0.1 0.046 46 460 0.0340 0.1173 1.2572 0.2221 0.0525 1.0416 0.1147 0.0525 0.1 0.067 47 470 0.0540 0.1863 1.4435 0.3153 0.0932 1.2245 0.1829 0.0932 0.2 .119 48 480 0.0270 0.0932 1.5366 0.3659 0.0505 1.3162 0.0917 0.0505 0.1 0.135 Q pea 49 490 0.0180 0.0621 1.5987 0.4009 0.0350 1.3775 0.0612 0.0350 0.1 0. 50 500 0.0134 0.0462 1.6450 0.4276 0.0267 1.4231 0.0456 0.0267 0.1 0.075 1 f'Q) 51 510 0.0134 0.0462 1.6912 0.4548 0.0272 1.4688 0.0457 0.0272 0.1 0.061 / 52 520 0.0134 0.0462 1.7374 0.4826 0.0277 1.5144 0.0457 0.0277 0.1 0.057 53 530 0.0088 0.0304 1.7678 0.5010 0.0185 1.5445 0.0300 0.0185 0.0 0.050 54 540 0.0088 0.0304 1.7981 0.5197 0.0187 1.5745 0.0300 0.0187 0.0 0.041 55 550 0.0088 0.0304 1.8285 0.5386 0.0189 1.6045 0.0300 0.0189 0.0 0.039 56 560 0.0088 0.0304 1.8589 0.5577 0.0191 1.6346 0.0300 0.0191 0.0 0.038 57 570 0.0088 0.0304 1.8892 0.5769 0.0193 1.6646 0.0301 0.0193 0.0 0.038 58 580 0.0088 0.0304 1.9196 0.5964 0.0194 1.6947 0.0301 0.0194 0.0 0.038 59 590 0.0088 0.0304 1.9499 0.6160 0.0196 1.7248 0.0301 0.0196 0.0 0.039 60 600 0.0088 0.0304 1.9803 0.6358 0.0198 1.7548 0.0301 0.0198 0.0 0.039 61 610 0.0088 0.0304 2.0107 0.6557 0.0200 1.7849 0.0301 0.0200 0.0 0.040 62 620 0.0088 0.0304 2.0410 0.6759 0.0201 1.8150 0.0301 0.0201 0.0 0.040 63 630 0.0088 0.0304 2.0714 0.6962 0.0203 1.8451 0.0301 0.0203 0.0 0.040 64 640 0.0088 0.0304 2.1017 0.7166 0.0205 1.8752 0.0301 0.0205 0.0 0.041 65 650 0.0072 0.0248 2.1266 0.7335 0.0168 1.8999 0.0246 0.0168 0.0 0.038 66 660 0.0072 0.0248 2.1514 0.7504 0.0170 1.9245 0.0246 0.0170 0.0 0.035 67 670 0.0072 0.0248 2.1763 0.7675 0.0171 1.9492 0.0246 0.0171 0.0 0.034 68 680 0.0072 0.0248 2.2011 0.7846 0.0171 1.9738 0.0247 0.0171 0.0 0.034 69 690 0.0072 0.0248 2.2259 0.8019 0.0172 1.9985 0.0247 0.0172 0.0 0.034 70 700 0.0072 0.0248 2.2508 0.8192 0.0173 2.0231 0.0247 0.0173 0.0 0.034 71 710 0.0072 0.0248 2.2756 0.8366 0.0174 2.0478 0.0247 0.0174 0.0 0.035 72 720 0.0072 0.0248 2.3005 0.8542 0.0175 2.0725 0.0247 0.0175 0.0 0.035 73 730 0.0072 0.0248 2.3253 0.8718 0.0176 2.0971 0.0247 0.0176 0.0 0.035 74 740 0.0072 0.0248 2.3501 0.8895 0.0177 2.1218 0.0247 0.0177 0.0 0.035 75 750 0.0072 0.0248 2.3750 0.9073 0.0178 2.1465 0.0247 0.0178 0.0 0.035 76 760 0.0072 0.0248 2.3998 0.9251 0.0179 2.1712 0.0247 0.0179 0.0 0.036 77 770 0.0057 0.0197 2.4195 0.9393 0.0142 2.1907 0.0195 0.0142 0.0 0.033 78 780 0.0057 0.0197 2.4392 0.9536 0.0143 2.2103 0.0195 0.0143 0.0 0.030 79 790 0.0057 0.0197 2.4588 0.9679 0.0143 2.2298 0.0195 0.0143 0.0 0.029 80 800 0.0057 0.0197 2.4785 0.9822 0.0144 2.2493 0.0195 0.0144 0.0 0.029 81 810 0.0057 0.0197 2.4981 0.9966 0.0144 2.2689 0.0195 0.0144 0.0 0.029 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 82 820 0.0057 0.0197 2.5178 1.0111 0.0145 2.2884 0.0196 0.0145 0.0 0.029 83 830 0.0057 0.0197 2.5375 1.0256 0.0145 2.3080 0.0196 0.0145 0.0 0.029 84 840 0.0057 0.0197 2.5571 1.0401 0.0145 2.3276 0.0196 0.0145 0.0 0.029 85 850 0.0057 0.0197 2.5768 1.0547 0.0146 2.3471 0.0196 0.0146 0.0 0.029 86 860 0.0057 0.0197 2.5965 1.0694 0.0146 2.3667 0.0196 0.0146 0.0 0.029 87 870 0.0057 0.0197 2.6161 1.0841 0.0147 2.3862 0.0196 0.0147 0.0 0.029 88 880 0.0057 0.0197 2.6358 1.0988 0.0147 2.4058 0.0196 0.0147 0.0 0.029 89 890 0.0050 0.0173 2.6531 1.1118 0.0130 2.4229 0.0172 0.0130 0.0 0.028 90 900 0.0050 0.0173 2.6703 1.1248 0.0130 2.4401 0.0172 0.0130 0.0 0.027 91 910 0.0050 0.0173 2.6876 1.1378 0.0130 2.4573 0.0172 0.0130 0.0 0.026 92 920 0.0050 0.0173 2.7048 1.1508 0.0131 2.4744 0.0172 0.0131 0.0 0.026 93 930 0.0050 0.0173 2.7221 1.1639 0.0131 2.4916 0.0172 0.0131 0.0 0.026 94 940 0.0050 0.0173 2.7393 1.1770 0.0131 2.5088 0.0172 0.0131 0.0 0.026 95 950 0.0050 0.0173 2.7566 1.1902 0.0132 2.5259 0.0172 0.0132 0.0 0.026 96 960 0.0050 0.0173 2.7738 1.2034 0.0132 2.5431 0.0172 0.0132 0.0 0.026 97 970 0.0050 0.0173 2.7911 1.2166 0.0132 2.5602 0.0172 0.0132 0.0 0.026 98 980 0.0050 0.0173 2.8083 1.2298 0.0132 2.5774 0.0172 0.0132 0.0 0.026 99 990 0.0050 0.0173 2.8256 1.2431 0.0133 2.5946 0.0172 0.0133 0.0 0.026 100 1000 0.0050 0.0173 2.8428 1.2564 0.0133 2.6118 0.0172 0.0133 0.0 0.027 101 1010 0.0040 0.0138 2.8566 1.2671 0.0107 2.6255 0.0137 0.0107 0.0 0.025 102 1020 0.0040 0.0138 2.8704 1.2778 0.0107 2.6392 0.0137 0.0107 0.0 0.022 103 1030 0.0040 0.0138 2.8842 1.2885 0.0107 2.6530 0.0137 0.0107 0.0 0.022 104 1040 0.0040 0.0138 2.8980 1.2992 0.0107 2.6667 0.0137 0.0107 0.0 0.021 105 1050 0.0040 0.0138 2.9118 1.3099 0.0107 2.6804 0.0137 0.0107 0.0 0.021 106 1060 0.0040 0.0138 2.9256 1.3207 0.0108 2.6942 0.0137 0.0108 0.0 0.021 107 1070 0.0040 0.0138 2.9394 1.3315 0.0108 2.7079 0.0137 0.0108 0.0 0.021 108 1080 0.0040 0.0138 2.9532 1.3423 0.0108 2.7217 0.0137 0.0108 0.0 0.022 109 1090 0.0040 0.0138 2.9670 1.3531 0.0108 2.7354 0.0137 0.0108 0.0 0.022 110 1100 0.0040 0.0138 2.9808 1.3639 0.0108 2.7491 0.0137 0.0108 0.0 0.022 111 1110 0.0040 0.0138 2.9946 1.3747 0.0108 2.7629 0.0137 0.0108 0.0 0.022 112 1120 0.0040 0.0138 3.0084 1.3856 0.0109 2.7766 0.0137 0.0109 0.0 0.022 113 1130 0.0040 0.0138 3.0222 1.3965 0.0109 2.7904 0.0137 0.0109 0.0 0.022 114 1140 0.0040 0.0138 3.0360 1.4074 0.0109 2.8041 0.0137 0.0109 0.0 0.022 115 1150 0.0040 0.0138 3.0498 1.4183 0.0109 2.8179 0.0137 0.0109 0.0 0.022 116 1160 0.0040 0.0138 3.0636 1.4292 0.0109 2.8316 0.0137 0.0109 0.0 0.022 117 1170 0.0040 0.0138 3.0774 1.4402 0.0109 2.8454 0.0137 0.0109 0.0 0.022 118 1180 0.0040 0.0138 3.0912 1.4511 0.0110 2.8591 0.0137 0.0110 0.0 0.022 119 1190 0.0040 0.0138 3.1050 1.4621 0.0110 2.8728 0.0137 0.0110 0.0 0.022 120 1200 0.0040 0.0138 3.1188 1.4731 0.0110 2.8866 0.0137 0.0110 0.0 0.022 121 1210 0.0040 0.0138 3.1326 1.4841 0.0110 2.9003 0.0137 0.0110 0.0 0.022 122 1220 0.0040 0.0138 3.1464 1.4951 0.0110 2.9141 0.0137 0.0110 0.0 0.022 123 1230 0.0040 0.0138 3.1602 1.5062 0.0110 2.9278 0.0137 0.0110 0.0 0.022 124 1240 0.0040 0.0138 3.1740 1.5172 0.0111 2.9416 0.0137 0.0111 0.0 0.022 125 1250 0.0040 0.0138 3.1878 1.5283 0.0111 2.9553 0.0137 0.0111 0.0 0.022 126 1260 0.0040 0.0138 3.2016 1.5394 0.0111 2.9691 0.0137 0.0111 0.0 0.022 127 1270 0.0040 0.0138 3.2154 1.5505 0.0111 2.9828 0.0137 0.0111 0.0 0.022 128 1280 0.0040 0.0138 3.2292 1.5616 0.0111 2.9966 0.0137 0.0111 0.0 0.022 129 1290 0.0040 0.0138 3.2430 1.5727 0.0111 3.0103 0.0138 0.0111 0.0 0.022 130 1300 0.0040 0.0138 3.2568 1.5839 0.0111 3.0241 0.0138 0.0111 0.0 0.022 131 1310 0.0040 0.0138 3.2706 1.5950 0.0112 3.0378 0.0138 0.0112 0.0 0.022 132 1320 0.0040 0.0138 3.2844 1.6062 0.0112 3.0516 0.0138 0.0112 0.0 0.022 133 1330 0.0040 0.0138 3.2982 1.6174 0.0112 3.0653 0.0138 0.0112 0.0 0.022 134 1340 0.0040 0.0138 3.3120 1.6286 0.0112 3.0791 0.0138 0.0112 0.0 0.022 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 135 1350 0.0040 0.0138 3.3258 1.6398 0.0112 3.0928 0.0138 0.0112 0.0 0.022 136 1360 0.0040 0.0138 3.3396 1.6511 0.0112 3.1066 0.0138 0.0112 0.0 0.022 137 1370 0.0040 0.0138 3.3534 1.6623 0.0112 3.1203 0.0138 0.0112 0.0 0.022 138 1380 0.0040 0.0138 3.3672 1.6736 0.0113 3.1341 0.0138 0.0113 0.0 0.022 139 1390 0.0040 0.0138 3.3810 1.6848 0.0113 3.1479 0.0138 0.0113 0.0 0.022 140 1400 0.0040 0.0138 3.3948 1.6961 0.0113 3.1616 0.0138 0.0113 0.0 0.023 141 1410 0.0040 0.0138 3.4086 1.7074 0.0113 3.1754 0.0138 0.0113 0.0 0.023 142 1420 0.0040 0.0138 3.4224 1.7187 0.0113 3.1891 0.0138 0.0113 0.0 0.023 143 1430 0.0040 0.0138 3.4362 1.7301 0.0113 3.2029 0.0138 0.0113 0.0 0.023 144 1440 0.0040 0.0138 3.4500 1.7414 0.0113 3.2166 0.0138 0.0113 0.0 0.023 Total Volume of Runoff= 2072.464 cu.ft. (Found by summing this column and multiplying by 600.600 is the conversion required to convert SUM(Q)in cfs to total volume in cubic feet as follows: V=SUM(Q)x dt (cu.ft.)=(cu.fUs)x(10 min.)x(60 s/min.) STORMWATER CALCULATION MATRIX-SANTA BARBARA HYDROGRAPGH METHOD Date: Sep-03 Given: Project= TWALITY-PARKING LOT Area = 0.33 acres Pt = 3.45 inches 10-Year/24 Hour Storm dt = 10 min. Tc = 5 min. (Post-Developed Site Conditions) PERVIOUS Parcel IMPERVIOUS Parcel Area = 0 acres Area = 0.33 acres CN = 80 CN = 98 S = 2.50 S = 0.20 0.2S = 0.50 0.2S = 0.04 Compute:Developed Conditions Runoff hydrograph Column(3)=SCS Type IA Rainfall Distribution Column(4)=Col. (3)x Pt= 10 year-24 Hour Hyetograph at this location. Column(5)=Accumulated Sum of Col. (4) Column(6)=[If P<=0.2S]=0; Note,use PERVIOUS Area"S"value. [If P>0.2S] =(Col.(5)-0.2S)A2/(Col.(5)+0.8S); Using the PERVIOUS Area"S"value. Column(7)=Col.(6)of Present Time Step-Col.(6)of Previous Time Step Column(8)=Same method as for Col.(6),except use the IMPERVIOUS Area"S"value. Column(9)=Col.(8)of the present time step-Col.(8)of the previous time step. Column(10)=((PERVIOUS area/Total area)x Col.(7))+((IMPERVIOUS area/Total area)x Col.(9)) Column(11)=(60.5 x Col.(10)x Total Area)/10(dt=10 minutes) Routing Constant,w=dt/(2Tc+dt) = 0.5000 Column(12)=Col.(12)of Previous Time Step+(w x[Col.(11)of Previous Time Step +Col.(11)of Present Time Step-(2 x Col.(12)of Previous Time Step)]) Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. %of Pt in. in. in. in. in. in. in. cfs cfs 1 10 0.0040 0.0138 0.0138 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 2 20 0.0040 0.0138 0.0276 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 3 30 0.0040 0.0138 0.0414 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 4 40 0.0040 0.0138 0.0552 0.0000 0.0000 0.0009 0.0009 0.0009 0.0 0.001 5 50 0.0040 0.0138 0.0690 0.0000 0.0000 0.0034 0.0025 0.0025 0.0 0.003 6 60 0.0040 0.0138 0.0828 0.0000 0.0000 0.0072 0.0037 0.0037 0.0 0.006 7 70 0.0040 0.0138 0.0966 0.0000 0.0000 0.0120 0.0048 0.0048 0.0 0.009 8 80 0.0040 0.0138 0.1104 0.0000 0.0000 0.0177 0.0057 0.0057 0.0 0.011 9 90 0.0040 0.0138 0.1242 0.0000 0.0000 0.0242 0.0065 0.0065 0.0 0.012 10 100 0.0040 0.0138 0.1380 0.0000 0.0000 0.0313 0.0072 0.0072 0.0 0.014 11 110 0.0050 0.0173 0.1553 0.0000 0.0000 0.0411 0.0098 0.0098 0.0 0.017 12 120 0.0050 0.0173 0.1725 0.0000 0.0000 0.0516 0.0105 0.0105 0.0 0.020 13 130 0.0050 0.0173 0.1898 0.0000 0.0000 0.0628 0.0112 0.0112 0.0 0.022 14 140 0.0050 0.0173 0.2070 0.0000 0.0000 0.0746 0.0118 0.0118 0.0 0.023 15 150 0.0050 0.0173 0.2243 0.0000 0.0000 0.0868 0.0122 0.0122 0.0 0.024 16 160 0.0050 0.0173 0.2415 0.0000 0.0000 0.0995 0.0127 0.0127 0.0 0.025 17 170 0.0060 0.0207 0.2622 0.0000 0.0000 0.1152 0.0157 0.0157 0.0 0.028 18 180 0.0060 0.0207 0.2829 0.0000 0.0000 0.1314 0.0162 0.0162 0.0 0.032 19 190 0.0060 0.0207 0.3036 0.0000 0.0000 0.1479 0.0166 0.0166 0.0 0.033 20 200 0.0060 0.0207 0.3243 0.0000 0.0000 0.1648 0.0169 0.0169 0.0 0.033 21 210 0.0060 0.0207 0.3450 0.0000 0.0000 0.1820 0.0172 0.0172 0.0 0.034 22 220 0.0060 0.0207 0.3657 0.0000 0.0000 0.1995 0.0175 0.0175 0.0 0.035 23 230 0.0070 0.0242 0.3899 0.0000 0.0000 0.2203 0.0207 0.0207 0.0 0.038 24 240 0.0070 0.0242 0.4140 0.0000 0.0000 0.2413 0.0210 0.0210 0.0 0.042 25 250 0.0070 0.0242 0.4382 0.0000 0.0000 0.2625 0.0213 0.0213 0.0 0.042 26 260 0.0070 0.0242 0.4623 0.0000 0.0000 0.2840 0.0215 0.0215 0.0 0.043 27 270 0.0070 0.0242 0.4865 0.0000 0.0000 0.3057 0.0217 0.0217 0.0 0.043 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 28 280 0.0070 0.0242 0.5106 0.0000 0.0000 0.3275 0.0219 0.0219 0.0 0.043 29 290 0.0082 0.0283 0.5389 0.0006 0.0006 0.3533 0.0258 0.0258 0.1 0.048 30 300 0.0082 0.0283 0.5672 0.0018 0.0012 0.3793 0.0260 0.0260 0.1 0.052 31 310 0.0082 0.0283 0.5955 0.0035 0.0018 0.4055 0.0262 0.0262 0.1 0.052 32 320 0.0082 0.0283 0.6238 0.0058 0.0023 0.4318 0.0263 0.0263 0.1 0.052 33 330 0.0082 0.0283 0.6521 0.0087 0.0029 0.4582 0.0265 0.0265 0.1 0.053 34 340 0.0082 0.0283 0.6803 0.0121 0.0034 0.4848 0.0266 0.0266 0.1 0.053 35 350 0.0095 0.0328 0.7131 0.0167 0.0046 0.5157 0.0309 0.0309 0.1 0.057 36 360 0.0095 0.0328 0.7459 0.0220 0.0053 0.5468 0.0311 0.0311 0.1 0.062 37 370 0.0095 0.0328 0.7787 0.0279 0.0059 0.5780 0.0312 0.0312 0.1 0.062 38 380 0.0095 0.0328 0.8114 0.0345 0.0066 0.6093 0.0313 0.0313 0.1 0.062 39 390 0.0095 0.0328 0.8442 0.0417 0.0072 0.6407 0.0314 0.0314 0.1 0.063 40 400 0.0095 0.0328 0.8770 0.0494 0.0077 0.6721 0.0315 0.0315 0.1 0.063 41 410 0.0134 0.0462 0.9232 0.0613 0.0119 0.7167 0.0445 0.0445 0.1 0.076 42 420 0.0134 0.0462 0.9695 0.0742 0.0129 0.7613 0.0447 0.0447 0.1 0.089 43 430 0.0134 0.0462 1.0157 0.0882 0.0140 0.8061 0.0448 0.0448 0.1 0.089 44 440 0.0180 0.0621 1.0778 0.1085 0.0203 0.8664 0.0603 0.0603 0.1 0.105 45 450 0.0180 0.0621 1.1399 0.1304 0.0219 0.9269 0.0605 0.0605 0.1 0.121 46 460 0.0340 0.1173 1.2572 0.1760 0.0456 1.0416 0.1147 0.1147 0.2 0 7�1 5� 47 470 0.0540 0.1863 1.4435 0.2585 0.0825 1.2245 0.1829 0.1829 0.4 `/g0 229987 48 480 0.0270 0.0932 1.5366 0.3038 0.0453 1.3162 0.0917 0.0917 0.2 peak 49 490 0.0180 0.0621 1.5987 0.3355 0.0316 1.3775 0.0612 0.0612 0.1 0.153 50 500 0.0134 0.0462 1.6450 0.3597 0.0242 1.4231 0.0456 0.0456 0.1 0.107 l,�(i� 51 510 0.0134 0.0462 1.6912 0.3844 0.0248 1.4688 0.0457 0.0457 0.1 0.091 S�`, / 52 520 0.0134 0.0462 1.7374 0.4097 0.0253 1.5144 0.0457 0.0457 0.1 0.091 Q.\') 53 530 0.0088 0.0304 1.7678 0.4266 0.0169 1.5445 0.0300 0.0300 0.1 0.076 54 540 0.0088 0.0304 1.7981 0.4437 0.0171 1.5745 0.0300 0.0300 0.1 0.060 55 550 0.0088 0.0304 1.8285 0.4610 0.0173 1.6045 0.0300 0.0300 0.1 0.060 56 560 0.0088 0.0304 1.8589 0.4785 0.0175 1.6346 0.0300 0.0300 0.1 0.060 57 570 0.0088 0.0304 1.8892 0.4962 0.0177 1.6646 0.0301 0.0301 0.1 0.060 58 580 0.0088 0.0304 1.9196 0.5141 0.0179 1.6947 0.0301 0.0301 0.1 0.060 59 590 0.0088 0.0304 1.9499 0.5322 0.0181 1.7248 0.0301 0.0301 0.1 0.060 60 600 0.0088 0.0304 1.9803 0.5505 0.0183 1.7548 0.0301 0.0301 0.1 0.060 61 610 0.0088 0.0304 2.0107 0.5690 0.0185 1.7849 0.0301 0.0301 0.1 0.060 62 620 0.0088 0.0304 2.0410 0.5877 0.0187 1.8150 0.0301 0.0301 0.1 0.060 63 630 0.0088 0.0304 2.0714 0.6065 0.0188 1.8451 0.0301 0.0301 0.1 0.060 64 640 0.0088 0.0304 2.1017 0.6255 0.0190 1.8752 0.0301 0.0301 0.1 0.060 65 650 0.0072 0.0248 2.1266 0.6412 0.0157 1.8999 0.0246 0.0246 0.0 0.055 66 660 0.0072 0.0248 2.1514 0.6569 0.0158 1.9245 0.0246 0.0246 0.0 0.049 67 670 0.0072 0.0248 2.1763 0.6728 0.0159 1.9492 0.0246 0.0246 0.0 0.049 68 680 0.0072 0.0248 2.2011 0.6888 0.0160 1.9738 0.0247 0.0247 0.0 0.049 69 690 0.0072 0.0248 2.2259 0.7049 0.0161 1.9985 0.0247 0.0247 0.0 0.049 70 700 0.0072 0.0248 2.2508 0.7211 0.0162 2.0231 0.0247 0.0247 0.0 0.049 71 710 0.0072 0.0248 2.2756 0.7374 0.0163 2.0478 0.0247 0.0247 0.0 0.049 72 720 0.0072 0.0248 2.3005 0.7538 0.0164 2.0725 0.0247 0.0247 0.0 0.049 73 730 0.0072 0.0248 2.3253 0.7703 0.0165 2.0971 0.0247 0.0247 0.0 0.049 74 740 0.0072 0.0248 2.3501 0.7869 0.0166 2.1218 0.0247 0.0247 0.0 0.049 75 750 0.0072 0.0248 2.3750 0.8036 0.0167 2.1465 0.0247 0.0247 0.0 0.049 76 760 0.0072 0.0248 2.3998 0.8203 0.0168 2.1712 0.0247 0.0247 0.0 0.049 77 770 0.0057 0.0197 2.4195 0.8337 0.0133 2.1907 0.0195 0.0195 0.0 0.044 78 780 0.0057 0.0197 2.4392 0.8471 0.0134 2.2103 0.0195 0.0195 0.0 0.039 79 790 0.0057 0.0197 2.4588 0.8605 0.0135 2.2298 0.0195 0.0195 0.0 0.039 80 800 0.0057 0.0197 2.4785 0.8740 0.0135 2.2493 0.0195 0.0195 0.0 0.039 81 810 0.0057 0.0197 2.4981 0.8876 0.0136 2.2689 0.0195 0.0195 0.0 0.039 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 82 820 0.0057 0.0197 2.5178 0.9012 0.0136 2.2884 0.0196 0.0196 0.0 0.039 83 830 0.0057 0.0197 2.5375 0.9149 0.0137 2.3080 0.0196 0.0196 0.0 0.039 84 840 0.0057 0.0197 2.5571 0.9286 0.0137 2.3276 0.0196 0.0196 0.0 0.039 85 850 0.0057 0.0197 2.5768 0.9424 0.0138 2.3471 0.0196 0.0196 0.0 0.039 86 860 0.0057 0.0197 2.5965 0.9562 0.0138 2.3667 0.0196 0.0196 0.0 0.039 87 870 0.0057 0.0197 2.6161 0.9701 0.0139 2.3862 0.0196 0.0196 0.0 0.039 88 880 0.0057 0.0197 2.6358 0.9840 0.0139 2.4058 0.0196 0.0196 0.0 0.039 89 890 0.0050 0.0173 2.6531 0.9963 0.0123 2.4229 0.0172 0.0172 0.0 0.037 90 900 0.0050 0.0173 2.6703 1.0085 0.0123 2.4401 0.0172 0.0172 0.0 0.034 91 910 0.0050 0.0173 2.6876 1.0209 0.0123 2.4573 0.0172 0.0172 0.0 0.034 92 920 0.0050 0.0173 2.7048 1.0332 0.0124 2.4744 0.0172 0.0172 0.0 0.034 93 930 0.0050 0.0173 2.7221 1.0456 0.0124 2.4916 0.0172 0.0172 0.0 0.034 94 940 0.0050 0.0173 2.7393 1.0581 0.0124 2.5088 0.0172 0.0172 0.0 0.034 95 950 0.0050 0.0173 2.7566 1.0705 0.0125 2.5259 0.0172 0.0172 0.0 0.034 96 960 0.0050 0.0173 2.7738 1.0830 0.0125 2.5431 0.0172 0.0172 0.0 0.034 97 970 0.0050 0.0173 2.7911 1.0956 0.0125 2.5602 0.0172 0.0172 0.0 0.034 98 980 0.0050 0.0173 2.8083 1.1081 0.0126 2.5774 0.0172 0.0172 0.0 0.034 99 990 0.0050 0.0173 2.8256 1.1207 0.0126 2.5946 0.0172 0.0172 0.0 0.034 100 1000 0.0050 0.0173 2.8428 1.1334 0.0126 2.6118 0.0172 0.0172 0.0 0.034 101 1010 0.0040 0.0138 2.8566 1.1435 0.0101 2.6255 0.0137 0.0137 0.0 0.031 102 1020 0.0040 0.0138 2.8704 1.1537 0.0102 2.6392 0.0137 0.0137 0.0 0.027 103 1030 0.0040 0.0138 2.8842 1.1638 0.0102 2.6530 0.0137 0.0137 0.0 0.027 104 1040 0.0040 0.0138 2.8980 1.1740 0.0102 2.6667 0.0137 0.0137 0.0 0.027 105 1050 0.0040 0.0138 2.9118 1.1842 0.0102 2.6804 0.0137 0.0137 0.0 0.027 106 1060 0.0040 0.0138 2.9256 1.1945 0.0102 2.6942 0.0137 0.0137 0.0 0.027 107 1070 0.0040 0.0138 2.9394 1.2047 0.0103 2.7079 0.0137 0.0137 0.0 0.027 108 1080 0.0040 0.0138 2.9532 1.2150 0.0103 2.7217 0.0137 0.0137 0.0 0.027 109 1090 0.0040 0.0138 2.9670 1.2253 0.0103 2.7354 0.0137 0.0137 0.0 0.027 110 1100 0.0040 0.0138 2.9808 1.2356 0.0103 2.7491 0.0137 0.0137 0.0 0.027 111 1110 0.0040 0.0138 2.9946 1.2460 0.0103 2.7629 0.0137 0.0137 0.0 0.027 112 1120 0.0040 0.0138 3.0084 1.2563 0.0104 2.7766 0.0137 0.0137 0.0 0.027 113 1130 0.0040 0.0138 3.0222 1.2667 0.0104 2.7904 0.0137 0.0137 0.0 0.027 114 1140 0.0040 0.0138 3.0360 1.2771 0.0104 2.8041 0.0137 0.0137 0.0 0.027 115 1150 0.0040 0.0138 3.0498 1.2875 0.0104 2.8179 0.0137 0.0137 0.0 0.027 116 1160 0.0040 0.0138 3.0636 1.2979 0.0104 2.8316 0.0137 0.0137 0.0 0.027 117 1170 0.0040 0.0138 3.0774 1.3083 0.0104 2.8454 0.0137 0.0137 0.0 0.027 118 1180 0.0040 0.0138 3.0912 1.3188 0.0105 2.8591 0.0137 0.0137 0.0 0.027 119 1190 0.0040 0.0138 3.1050 1.3293 0.0105 2.8728 0.0137 0.0137 0.0 0.027 120 1200 0.0040 0.0138 3.1188 1.3398 0.0105 2.8866 0.0137 0.0137 0.0 0.027 121 1210 0.0040 0.0138 3.1326 1.3503 0.0105 2.9003 0.0137 0.0137 0.0 0.027 122 1220 0.0040 0.0138 3.1464 1.3608 0.0105 2.9141 0.0137 0.0137 0.0 0.027 123 1230 0.0040 0.0138 3.1602 1.3714 0.0106 2.9278 0.0137 0.0137 0.0 0.027 124 1240 0.0040 0.0138 3.1740 1.3820 0.0106 2.9416 0.0137 0.0137 0.0 0.027 125 1250 0.0040 0.0138 3.1878 1.3925 0.0106 2.9553 0.0137 0.0137 0.0 0.027 126 1260 0.0040 0.0138 3.2016 1.4032 0.0106 2.9691 0.0137 0.0137 0.0 0.027 127 1270 0.0040 0.0138 3.2154 1.4138 0.0106 2.9828 0.0137 0.0137 0.0 0.027 128 1280 0.0040 0.0138 3.2292 1.4244 0.0106 2.9966 0.0137 0.0137 0.0 0.027 129 1290 0.0040 0.0138 3.2430 1.4351 0.0107 3.0103 0.0138 0.0138 0.0 0.027 130 1300 0.0040 0.0138 3.2568 1.4457 0.0107 3.0241 0.0138 0.0138 0.0 0.027 131 1310 0.0040 0.0138 3.2706 1.4564 0.0107 3.0378 0.0138 0.0138 0.0 0.027 132 1320 0.0040 0.0138 3.2844 1.4671 0.0107 3.0516 0.0138 0.0138 0.0 0.027 133 1330 0.0040 0.0138 3.2982 1.4778 0.0107 3.0653 0.0138 0.0138 0.0 0.027 134 1340 0.0040 0.0138 3.3120 1.4886 0.0107 3.0791 0.0138 0.0138 0.0 0.027 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distil- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 135 1350 0.0040 0.0138 3.3258 1.4993 0.0108 3.0928 0.0138 0.0138 0.0 0.027 136 1360 0.0040 0.0138 3.3396 1.5101 0.0108 3.1066 0.0138 0.0138 0.0 0.027 137 1370 0.0040 0.0138 3.3534 1.5209 0.0108 3.1203 0.0138 0.0138 0.0 0.027 138 1380 0.0040 0.0138 3.3672 1.5317 0.0108 3.1341 0.0138 0.0138 0.0 0.027 139 1390 0.0040 0.0138 3.3810 1.5425 0.0108 3.1479 0.0138 0.0138 0.0 0.027 140 1400 0.0040 0.0138 3.3948 1.5533 0.0108 3.1616 0.0138 0.0138 0.0 0.027 141 1410 0.0040 0.0138 3.4086 1.5642 0.0108 3.1754 0.0138 0.0138 0.0 0.027 142 1420 0.0040 0.0138 3.4224 1.5750 0.0109 3.1891 0.0138 0.0138 0.0 0.027 143 1430 0.0040 0.0138 3.4362 1.5859 0.0109 3.2029 0.0138 0.0138 0.0 0.027 144 1440 0.0040 0.0138 3.4500 1.5968 0.0109 3.2166 0.0138 0.0138 0.0 0.027 Total Volume of Runoff= 3844.961 cu.ft. (Found by summing this column and multiplying by 600.600 is the conversion required to convert SUM(Q)in cfs to total volume in cubic feet as follows: V=SUM(Q)x dt (cu.ft.)=(cult's)x(10 min.)x(60 s/min.) STORMWATER CALCULATION MATRIX-SANTA BARBARA HYDROGRAPGH METHOD Date: 37868.00 POND ROUTING Given: Project= TWALITY PARKING LOT Average Pond Length(ft)= 20.000 Average Pond Width (ft)= 15.000 Orifice 1 Diameter(ft)= 0.125 Orifice 2 Diameter(ft)= 0.500 Height to Orifice 2= 1.500 Orifice 2 Area 0.196 SF Orifice 1 Area= 0.012 SF Avg Pond Area= 300.000 SF Column(3)=Col A:L*600= Incremental CFS into Pond Column(4)=Starting Pond Depth=Previous Remaining Pond Depth=Col(11) Column(5)= Column(6)=2*g*Starting h Column(7)=Square Root of 2gh Column(8)=Incremental Vol out=Col(7)*0.60*Orifice Area*600 Column(9)=Delta Vol=Incremental Vol in-Incremental Vol out=Col(3)-Col (8) Column(10)= Remaining Pond Vol=Previous Remaining Vol+Col(9) Column(11)=Pond Depth at End of Interval=Col(J)/Pond Area Column(12)=Pond CFS Discharge=Col(8)/600 (1) (2) (3) (4) (6) (7) (8) (6a) (9) Time Time Increm. Starting Increm. Delta Increm. Vol into Pond Vol 1 out Vol Pond Depth Pond min. cf ft. cf cf 1 10 0.00 0.000 0.000 0.000 0.000 -96.60 0.000 0.000 0.00 2 20 0.00 0.000 0.000 0.000 0.000 -96.60 0.000 0.000 0.00 3 30 0.00 0.000 0.000 0.000 0.000 -96.60 0.000 0.000 0.00 4 40 0.57 0.000 0.000 0.015 0.065 -96.60 0.000 0.000 0.50 5 50 2.05 0.002 0.108 0.329 1.453 -96.49 0.000 0.000 0.59 6 60 3.72 0.004 0.236 0.486 2.145 -96.36 0.000 0.000 1.58 7 70 5.12 0.009 0.575 0.758 3.349 -96.03 0.000 0.000 1.78 8 80 6.31 0.015 0.956 0.978 4.319 -95.64 0.000 0.000 1.99 9 90 7.31 0.021 1.382 1.176 5.194 -95.22 0.000 0.000 2.12 10 100 8.18 0.029 1.837 1.356 5.989 -94.76 0.000 0.000 2.19 11 110 10.14 0.036 2.308 1.519 6.712 -94.29 0.000 0.000 3.43 12 120 12.16 0.047 3.043 1.745 7.707 -93.56 0.000 0.000 4.45 13 130 13.01 0.062 3.998 2.000 8.834 -92.60 0.000 0.000 4.18 14 140 13.74 0.076 4.895 2.212 9.774 -91.71 0.000 0.000 3.97 15 150 14.37 0.089 5.746 2.397 10.590 -90.85 0.000 0.000 3.78 16 160 14.92 0.102 6.558 2.561 11.314 -90.04 0.000 0.000 3.61 17 170 16.99 0.114 7.333 2.708 11.963 -89.27 0.000 0.000 5.03 18 180 19.08 0.131 8.411 2.900 12.813 -88.19 0.000 0.000 6.26 19 190 19.60 0.151 9.756 3.124 13.799 -86.84 0.000 0.000 5.80 20 200 20.05 0.171 11.001 3.317 14.653 -85.60 0.000 0.000 5.40 21 210 20.44 0.189 12.159 3.487 15.405 -84.44 0.000 0.000 5.04 22 220 20.79 0.206 13.241 3.639 16.076 -83.36 0.000 0.000 4.72 23 230 22.88 0.221 14.253 3.775 16.679 -82.35 0.000 0.000 6.20 24 240 24.98 0.242 15.585 3.948 17.441 -81.01 0.000 0.000 7.54 25 250 25.31 0.267 17.204 4.148 18.324 -79.40 0.000 0.000 6.98 26 260 25.59 0.290 18.703 4.325 19.106 -77.90 0.000 0.000 6.49 27 270 25.85 0.312 20.096 4.483 19.805 -76.50 0.000 0.000 6.04 (1) (2) (3) (4) (6) (7) (8) (9) Time Time Increm. Starting Increm. Delta Increm. Vol into Pond Vol out Vol Pond Depth Pond min. cf ft. cf cf 28 280 26.07 0.332 21.393 4.625 20.434 -75.21 0.000 0.000 5.64 29 290 28.54 0.351 22.603 4.754 21.004 -74.00 0.000 0.000 7.54 30 300 31.02 0.376 24.221 4.921 21.742 -72.38 0.000 0.000 9.28 31 310 31.24 0.407 26.213 5.120 22.619 -70.39 0.000 0.000 8.62 32 320 31.43 0.436 28.063 5.297 23.404 -68.54 0.000 0.000 8.03 33 330 31.61 0.463 29.787 5.458 24.112 -66.81 0.000 0.000 7.50 34 340 31.76 0.488 31.396 5.603 24.754 -65.20 0.000 0.000 7.01 35 350 34.44 0.511 32.900 5.736 25.340 -63.70 0.000 0.000 9.10 36 360 37.13 0.541 34.854 5.904 26.082 -61.75 0.000 0.000 11.05 37 370 37.28 0.578 37.226 6.101 26.955 -59.37 0.000 0.000 10.33 38 380 37.42 0.612 39.442 6.280 27.746 -57.16 0.000 0.000 9.67 39 390 37.54 0.645 41.518 6.443 28.466 -55.08 0.000 0.000 9.07 40 400 37.65 0.675 43.466 6.593 29.126 -53.13 0.000 0.000 8.52 41 410 45.52 0.703 45.295 6.730 29.733 -51.30 0.000 0.000 15.79 42 420 53.42 0.756 48.684 6.977 30.825 -47.92 0.000 0.000 22.60 43 430 53.58 0.831 53.535 7.317 32.324 -43.07 0.000 0.000 21.25 44 440 62.96 0.902 58.097 7.622 33.674 -38.50 0.000 0.000 29.29 45 450 72.37 1.000 64.384 8.024 35.449 -32.22 0.000 0.000 36.92 46 460 104.91 1.123 72.311 8.504 37.568 -24.29 0.000 0.000 67.35 47 470 178.22 1.347 86.767 9.315 41.152 -9.83 0.000 0.000 137.07 48 480 164.49 1.804 116.192 10.779 47.621 19.59 4.426 312.878 -196.01 49 490 91.62 1.151 74.115 8.609 38.034 -22.48 0.000 0.000 53.59 50 500 64.01 1.329 85.618 9.253 40.879 -10.98 0.000 0.000 23.13 51 510 54.67 1.407 90.583 9.518 42.047 -6.02 0.000 0.000 12.63 52 520 54.71 1.449 93.293 9.659 42.672 -3.31 0.000 0.000 12.04 53 530 45.34 1.489 95.877 9.792 43.258 -0.72 0.000 0.000 2.08 54 540 35.96 1.496 96.324 9.814 43.359 -0.28 0.000 0.000 -7.40 55 550 35.97 1.471 94.736 9.733 43.000 -1.86 0.000 0.000 -7.03 56 560 35.99 1.448 93.228 9.655 42.657 -3.37 0.000 0.000 -6.67 57 570 36.00 1.425 91.796 9.581 42.328 -4.80 0.000 0.000 -6.33 58 580 36.01 1.404 90.437 9.510 42.013 -6.16 0.000 0.000 -6.00 59 590 36.02 1.384 89.148 9.442 41.713 -7.45 0.000 0.000 -5.69 60 600 36.03 1.365 87.926 9.377 41.426 -8.67 0.000 0.000 -5.40 61 610 36.04 1.347 86.767 9.315 41.152 -9.83 0.000 0.000 -5.11 62 620 36.05 1.330 85.670 9.256 40.891 -10.93 0.000 0.000 -4.84 63 630 36.06 1.314 84.630 9.199 40.642 -11.97 0.000 0.000 -4.59 64 640 36.06 1.299 83.645 9.146 40.405 -12.95 0.000 0.000 -4.34 65 650 32.79 1.284 82.714 9.095 40.179 -13.89 0.000 0.000 -7.39 66 660 29.52 1.260 81.128 9.007 39.792 -15.47 0.000 0.000 -10.27 67 670 29.52 1.226 78.923 8.884 39.248 -17.68 0.000 0.000 -9.72 68 680 29.53 1.193 76.836 8.766 38.725 -19.76 0.000 0.000 -9.20 69 690 29.53 1.162 74.862 8.652 38.225 -21.74 0.000 0.000 -8.69 70 700 29.54 1.133 72.996 8.544 37.745 -23.60 0.000 0.000 -8.21 71 710 29.54 1.106 71.234 8.440 37.287 -25.37 0.000 0.000 -7.74 72 720 29.55 1.080 69.572 8.341 36.849 -27.03 0.000 0.000 -7.30 73 730 29.55 1.056 68.005 8.246 36.432 -28.60 0.000 0.000 -6.88 74 740 29.56 1.033 66.528 8.156 36.034 -30.07 0.000 0.000 -6.48 75 750 29.56 1.011 65.137 8.071 35.656 -31.46 0.000 0.000 -6.10 76 760 29.56 0.991 63.828 7.989 35.296 -32.77 0.000 0.000 -5.73 77 770 26.49 0.972 62.598 7.912 34.954 -34.00 0.000 0.000 -8.47 78 780 23.41 0.944 60.780 7.796 34.443 -35.82 0.000 0.000 -11.03 79 790 23.41 0.907 58.412 7.643 33.765 -38.19 0.000 0.000 -10.35 80 800 23.41 0.873 56.189 7.496 33.116 -40.41 0.000 0.000 -9.70 81 810 23.42 0.840 54.107 7.356 32.497 -42.49 0.000 0.000 -9.08 (1) (2) (3) (4) (6) (7) (8) (9) Time Time Increm. Starting Increm. Delta Increm. Vol into Pond Vol out Vol Pond Depth Pond min. cf ft. cf cf 82 820 23.42 0.810 54.107 7.356 32.497 -44.44 0.000 0.000 -9.08 83 830 23.42 0.780 50.209 7.086 31.304 -46.39 0.000 0.000 -7.88 84 840 23.42 0.753 48.516 6.965 30.772 -48.08 0.000 0.000 -7.35 85 850 23.42 0.729 46.938 6.851 30.268 -49.66 0.000 0.000 -6.84 86 860 23.43 0.706 45.469 6.743 29.790 -51.13 0.000 0.000 -6.36 87 870 23.43 0.685 44.103 6.641 29.339 -52.50 0.000 0.000 -5.91 88 880 23.43 0.665 42.834 6.545 28.914 -53.77 0.000 0.000 -5.48 89 890 21.99 0.647 41.657 6.454 28.514 -54.94 0.000 0.000 -6.52 90 900 20.56 0.625 40.257 6.345 28.031 -56.34 0.000 0.000 -7.48 91 910 20.56 0.600 38.652 6.217 27.466 -57.95 0.000 0.000 -6.91 92 920 20.56 0.577 37.169 6.097 26.934 -59.43 0.000 0.000 -6.38 93 930 20.56 0.556 35.800 5.983 26.434 -60.80 0.000 0.000 -5.87 94 940 20.56 0.536 34.539 5.877 25.964 -62.06 0.000 0.000 -5.40 95 950 20.56 0.518 33.379 5.777 25.524 -63.22 0.000 0.000 -4.96 96 960 20.56 0.502 32.314 5.685 25.114 -64.29 0.000 0.000 -4.55 97 970 20.56 0.487 31.337 5.598 24.731 -65.26 0.000 0.000 -4.17 98 980 20.57 0.473 30.442 5.517 24.375 -66.16 0.000 0.000 -3.81 99 990 20.57 0.460 29.625 5.443 24.046 -66.98 0.000 0.000 -3.48 100 1000 20.57 0.448 28.878 5.374 23.741 -67.72 0.000 0.000 -3.17 101 1010 18.51 0.438 28.196 5.310 23.459 -68.40 0.000 0.000 -4.95 102 1020 16.46 0.421 27.134 5.209 23.013 -69.47 0.000 0.000 -6.56 103 1030 16.46 0.399 25.727 5.072 22.408 -70.87 0.000 0.000 -5.95 104 1040 16.46 0.380 24.449 4.945 21.845 -72.15 0.000 0.000 -5.39 105 1050 16.46 0.362 23.292 4.826 21.322 -73.31 0.000 0.000 -4.86 106 1060 16.46 0.345 22.248 4.717 20.838 -74.35 0.000 0.000 -4.38 107 1070 16.46 0.331 21.308 4.616 20.393 -75.29 0.000 0.000 -3.93 108 1080 16.46 0.318 20.463 4.524 19.985 -76.14 0.000 0.000 -3.53 109 1090 16.46 0.306 19.707 4.439 19.612 -76.89 0.000 0.000 -3.15 110 1100 16.46 0.295 19.030 4.362 19.272 -77.57 0.000 0.000 -2.81 111 1110 16.46 0.286 18.427 4.293 18.964 -78.17 0.000 0.000 -2.50 112 1120 16.46 0.278 17.889 4.230 18.686 -78.71 0.000 0.000 -2.22 113 1130 16.46 0.270 17.412 4.173 18.435 -79.19 0.000 0.000 -1.97 114 1140 16.46 0.264 16.989 4.122 18.209 -79.61 0.000 0.000 -1.75 115 1150 16.46 0.258 16.614 4.076 18.007 -79.99 0.000 0.000 -1.54 116 1160 16.46 0.253 16.282 4.035 17.827 -80.32 0.000 0.000 -1.36 117 1170 16.46 0.248 15.990 3.999 17.666 -80.61 0.000 0.000 -1.20 118 1180 16.47 0.244 15.732 3.966 17.523 -80.87 0.000 0.000 -1.06 119 1190 16.47 0.241 15.505 3.938 17.396 -81.09 0.000 0.000 -0.93 120 1200 16.47 0.238 15.305 3.912 17.284 -81.29 0.000 0.000 -0.82 121 1210 16.47 0.235 15.130 3.890 17.184 -81.47 0.000 0.000 -0.72 122 1220 16.47 0.233 14.976 3.870 17.097 -81.62 0.000 0.000 -0.63 123 1230 16.47 0.230 14.841 3.852 17.019 -81.76 0.000 0.000 -0.55 124 1240 16.47 0.229 14.723 3.837 16.951 -81.88 0.000 0.000 -0.48 125 1250 16.47 0.227 14.619 3.823 16.892 -81.98 0.000 0.000 -0.42 126 1260 16.47 0.226 14.528 3.812 16.839 -82.07 0.000 0.000 -0.37 127 1270 16.47 0.224 14.449 3.801 16.793 -82.15 0.000 0.000 -0.32 128 1280 16.47 0.223 14.380 3.792 16.753 -82.22 0.000 0.000 -0.28 129 1290 16.47 0.222 14.319 3.784 16.718 -82.28 0.000 0.000 -0.25 130 1300 16.47 0.222 14.266 3.777 16.687 -82.33 0.000 0.000 -0.21 131 1310 16.47 0.221 14.220 3.771 16.660 -82.38 0.000 0.000 -0.19 132 1320 16.47 0.220 14.180 3.766 16.636 -82.42 0.000 0.000 -0.16 133 1330 16.47 0.220 14.145 3.761 16.615 -82.46 0.000 0.000 -0.14 134 1340 16.47 0.219 14.114 3.757 16.597 -82.49 0.000 0.000 -0.12 (1) (2) (3) (4) (6) (7) (8) (9) Time Time Increm. Starting Increm. Delta Increm. Vol into Pond Vol out Vol Pond Depth Pond min. cf ft. cf cf 135 1350 16.47 0.219 14.088 3.753 16.582 -82.51 0.000 0.000 -0.11 136 1360 16.47 0.218 14.064 3.750 16.568 -82.54 0.000 0.000 -0.09 137 1370 16.47 0.218 14.044 3.748 16.556 -82.56 0.000 0.000 -0.08 138 1380 16.48 0.218 14.027 3.745 16.546 -82.57 0.000 0.000 -0.07 139 1390 16.48 0.218 14.012 3.743 16.537 -82.59 0.000 0.000 -0.06 140 1400 16.48 0.217 13.999 3.741 16.529 -82.60 0.000 0.000 -0.05 141 1410 16.48 0.217 13.987 3.740 16.523 -82.61 0.000 0.000 -0.05 142 1420 16.48 0.217 13.977 3.739 16.517 -82.62 0.000 0.000 -0.04 143 1430 16.48 0.217 13.969 3.737 16.512 -82.63 0.000 0.000 -0.03 144 1440 16.48 0.217 13.961 3.736 16.507 -82.64 0.000 0.000 -0.03 3844.96 (10) (11) (12) Remain Remain CFS Total Pond Discharge Vol Depth in. ft 0.0 0.000 0.00 0.0 0.000 0.00 0.0 0.000 0.00 0.5 0.002 0.00 1.1 0.004 0.00 2.7 0.009 0.00 4.5 0.015 0.01 6.4 0.021 0.01 8.6 0.029 0.01 10.8 0.036 0.01 14.2 0.047 0.01 18.6 0.062 0.01 22.8 0.076 0.01 26.8 0.089 0.02 30.6 0.102 0.02 34.2 0.114 0.02 39.2 0.131 0.02 45.4 0.151 0.02 51.2 0.171 0.02 56.6 0.189 0.02 61.7 0.206 0.03 66.4 0.221 0.03 72.6 0.242 0.03 80.1 0.267 0.03 87.1 0.290 0.03 93.6 0.312 0.03 99.7 0.332 0.03 (10) (11) (12) Remain Remain CFS Total Pond Discharge Vol Depth in. ft 105.3 0.351 0.03 112.8 0.376 0.04 122.1 0.407 0.04 130.7 0.436 0.04 138.8 0.463 0.04 146.3 0.488 0.04 153.3 0.511 0.04 162.4 0.541 0.04 173.4 0.578 0.04 183.7 0.612 0.04 193.4 0.645 0.05 202.5 0.675 0.05 211.0 0.703 0.05 226.8 0.756 0.05 249.4 0.831 0.05 270.6 0.902 0.05 299.9 1.000 0.06 336.9 1.123 0.06 1 + 0.06 .804 0.07 0.08 398.8 1.329 0.06 422.0 1.407 0.07 434.6 1.449 0.07 446.6 1.489 0.07 448.7 1.496 0.07 441.3 1.471 0.07 434.3 1.448 0.07 427.6 1.425 0.07 421.3 1.404 0.07 415.3 1.384 0.07 409.6 1.365 0.07 404.2 1.347 0.07 399.1 1.330 0.07 394.2 1.314 0.07 389.7 1.299 0.07 385.3 1.284 0.07 377.9 1.260 0.07 367.7 1.226 0.07 357.9 1.193 0.07 348.7 1.162 0.06 340.0 1.133 0.06 331.8 1.106 0.06 324.1 1.080 0.06 316.8 1.056 0.06 309.9 1.033 0.06 303.4 1.011 0.06 297.3 0.991 0.06 291.6 0.972 0.06 283.1 0.944 0.06 272.1 0.907 0.06 261.8 0.873 0.06 252.0 0.840 0.06 243.0 0.810 0.05 (10) (11) (12) Remain Remain CFS Total Pond Discharge Vol Depth in. ft 233.9 0.780 0.05 226.0 0.753 0.05 218.7 0.729 0.05 211.8 0.706 0.05 205.4 0.685 0.05 199.5 0.665 0.05 194.1 0.647 0.05 187.5 0.625 0.05 180.1 0.600 0.05 173.1 0.577 0.05 166.8 0.556 0.04 160.9 0.536 0.04 155.5 0.518 0.04 150.5 0.502 0.04 146.0 0.487 0.04 141.8 0.473 0.04 138.0 0.460 0.04 134.5 0.448 0.04 131.3 0.438 0.04 126.4 0.421 0.04 119.8 0.399 0.04 113.9 0.380 0.04 108.5 0.362 0.04 103.6 0.345 0.04 99.3 0.331 0.03 95.3 0.318 0.03 91.8 0.306 0.03 88.6 0.295 0.03 85.8 0.286 0.03 83.3 0.278 0.03 81.1 0.270 0.03 79.1 0.264 0.03 77.4 0.258 0.03 75.8 0.253 0.03 74.5 0.248 0.03 73.3 0.244 0.03 72.2 0.241 0.03 71.3 0.238 0.03 70.5 0.235 0.03 69.8 0.233 0.03 69.1 0.230 0.03 68.6 0.229 0.03 68.1 0.227 0.03 67.7 0.226 0.03 67.3 0.224 0.03 67.0 0.223 0.03 66.7 0.222 0.03 66.5 0.222 0.03 66.2 0.221 0.03 66.1 0.220 0.03 65.9 0.220 0.03 65.7 0.219 0.03 65.6 0.219 0.03 (10) (11) (12) Remain Remain CFS Total Pond Discharge Vol Depth in. ft 65.5 0.218 0.03 65.4 0.218 0.03 65.3 0.218 0.03 65.3 0.218 0.03 65.2 0.217 0.03 65.2 0.217 0.03 65.1 0.217 0.03 65.1 0.217 0.03 65.0 0.217 0.03 65.0 0.217 0.03 STORMWATER CALCULATION MATRIX-SANTA BARBARA HYDROGRAPGH METHOD Date: Sep-03 Given: Project= TWALITY-PARKING LOT Area = 0.33 acres Pt = 3.9 inches 25-Year/24 Hour Storm dt = 10 min. Tc = 10 min. (Pre-Developed Site Conditions) PERVIOUS Parcel IMPERVIOUS Parcel Area = 0.33 acres Area = 0 acres CN = 82 CN = 98 S = 2.20 S = 0.20 0.2S = 0.44 0.2S = 0.04 Compute:Developed Conditions Runoff hydrograph Column(3)=SCS Type IA Rainfall Distribution Column(4) =Col. (3)x Pt= 10 year-24 Hour Hyetograph at this location. Column(5)=Accumulated Sum of Col. (4) Column(6)=[If P<=0.2S] =0; Note, use PERVIOUS Area"S"value. [If P>0.2S] =(Col.(5)-0.2S)^2/(Col.(5)+0.8S); Using the PERVIOUS Area"S"value. Column(7)=Col.(6)of Present Time Step-Col.(6)of Previous Time Step Column(8)=Same method as for Col.(6), except use the IMPERVIOUS Area"S"value. Column(9)=Col.(8)of the present time step-Col.(8)of the previous time step. Column(10)=((PERVIOUS area/Total area)x Col.(7))+((IMPERVIOUS area/Total area)x Col.(9)) Column(11)=(60.5 x Col.(10)x Total Area)/10(dt= 10 minutes) Routing Constant,w=dt/(2Tc+dt) = 0.3333 Column(12)=Col.(12)of Previous Time Step+(w x[Col.(11)of Previous Time Step +Col.(11)of Present Time Step-(2 x Col.(12)of Previous Time Step)]) Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. %of Pt in. in. in. in. in. in. in. cfs cfs 1 10 0.0040 0.0156 0.0156 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 2 20 0.0040 0.0156 0.0312 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 3 30 0.0040 0.0156 0.0468 0.0000 0.0000 0.0002 0.0002 0.0000 0.0 0.000 4 40 0.0040 0.0156 0.0624 0.0000 0.0000 0.0021 0.0019 0.0000 0.0 0.000 5 50 0.0040 0.0156 0.0780 0.0000 0.0000 0.0057 0.0037 0.0000 0.0 0.000 6 60 0.0040 0.0156 0.0936 0.0000 0.0000 0.0108 0.0051 0.0000 0.0 0.000 7 70 0.0040 0.0156 0.1092 0.0000 0.0000 0.0172 0.0063 0.0000 0.0 0.000 8 80 0.0040 0.0156 0.1248 0.0000 0.0000 0.0245 0.0073 0.0000 0.0 0.000 9 90 0.0040 0.0156 0.1404 0.0000 0.0000 0.0327 0.0082 0.0000 0.0 0.000 10 100 0.0040 0.0156 0.1560 0.0000 0.0000 0.0416 0.0089 0.0000 0.0 0.000 11 110 0.0050 0.0195 0.1755 0.0000 0.0000 0.0535 0.0120 0.0000 0.0 0.000 12 120 0.0050 0.0195 0.1950 0.0000 0.0000 0.0664 0.0128 0.0000 0.0 0.000 13 130 0.0050 0.0195 0.2145 0.0000 0.0000 0.0799 0.0135 0.0000 0.0 0.000 14 140 0.0050 0.0195 0.2340 0.0000 0.0000 0.0939 0.0141 0.0000 0.0 0.000 15 150 0.0050 0.0195 0.2535 0.0000 0.0000 0.1085 0.0146 0.0000 0.0 0.000 16 160 0.0050 0.0195 0.2730 0.0000 0.0000 0.1236 0.0150 0.0000 0.0 0.000 17 170 0.0060 0.0234 0.2964 0.0000 0.0000 0.1421 0.0185 0.0000 0.0 0.000 18 180 0.0060 0.0234 0.3198 0.0000 0.0000 0.1611 0.0190 0.0000 0.0 0.000 19 190 0.0060 0.0234 0.3432 0.0000 0.0000 0.1805 0.0194 0.0000 0.0 0.000 20 200 0.0060 0.0234 0.3666 0.0000 0.0000 0.2003 0.0198 0.0000 0.0 0.000 21 210 0.0060 0.0234 0.3900 0.0000 0.0000 0.2204 0.0201 0.0000 0.0 0.000 22 220 0.0060 0.0234 0.4134 0.0000 0.0000 0.2407 0.0203 0.0000 0.0 0.000 23 230 0.0070 0.0273 0.4407 0.0000 0.0000 0.2648 0.0240 0.0000 0.0 0.000 24 240 0.0070 0.0273 0.4680 0.0004 0.0004 0.2891 0.0243 0.0004 0.0 0.000 25 250 0.0070 0.0273 0.4953 0.0014 0.0010 0.3136 0.0246 0.0010 0.0 0.001 26 260 0.0070 0.0273 0.5226 0.0031 0.0017 0.3384 0.0248 0.0017 0.0 0.002 27 270 0.0070 0.0273 0.5499 0.0053 0.0023 0.3634 0.0250 0.0023 0.0 0.003 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 28 280 0.0070 0.0273 0.5772 0.0082 0.0029 0.3885 0.0251 0.0029 0.0 0.005 29 290 0.0082 0.0320 0.6092 0.0122 0.0041 0.4182 0.0297 0.0041 0.0 0.006 30 300 0.0082 0.0320 0.6412 0.0170 0.0048 0.4480 0.0298 0.0048 0.0 0.008 31 310 0.0082 0.0320 0.6731 0.0226 0.0055 0.4780 0.0300 0.0055 0.0 0.010 32 320 0.0082 0.0320 0.7051 0.0288 0.0062 0.5082 0.0301 0.0062 0.0 0.011 33 330 0.0082 0.0320 0.7371 0.0356 0.0069 0.5385 0.0303 0.0069 0.0 0.012 34 340 0.0082 0.0320 0.7691 0.0431 0.0075 0.5689 0.0304 0.0075 0.0 0.014 35 350 0.0095 0.0371 0.8061 0.0526 0.0095 0.6042 0.0353 0.0095 0.0 0.016 36 360 0.0095 0.0371 0.8432 0.0628 0.0102 0.6397 0.0355 0.0102 0.0 0.018 37 370 0.0095 0.0371 0.8802 0.0738 0.0110 0.6752 0.0356 0.0110 0.0 0.020 38 380 0.0095 0.0371 0.9173 0.0856 0.0117 0.7109 0.0357 0.0117 0.0 0.022 39 390 0.0095 0.0371 0.9543 0.0980 0.0124 0.7467 0.0358 0.0124 0.0 0.023 40 400 0.0095 0.0371 0.9914 0.1110 0.0131 0.7826 0.0359 0.0131 0.0 0.025 41 410 0.0134 0.0523 1.0436 0.1306 0.0195 0.8333 0.0507 0.0195 0.0 0.030 42 420 0.0134 0.0523 1.0959 0.1513 0.0207 0.8841 0.0508 0.0207 0.0 0.037 43 430 0.0134 0.0523 1.1482 0.1732 0.0219 0.9350 0.0509 0.0219 0.0 0.041 44 440 0.0180 0.0702 1.2184 0.2042 0.0310 1.0036 0.0686 0.0310 0.1 0.049 45 450 0.0180 0.0702 1.2886 0.2370 0.0328 1.0723 0.0687 0.0328 0.1 0.059 46 460 0.0340 0.1326 1.4212 0.3036 0.0666 1.2025 0.1302 0.0666 0.1 0.086 47 470 0.0540 0.2106 1.6318 0.4199 0.1163 1.4101 0.2075 0.1163 0.2 48 480 0.0270 0.1053 1.7371 0.4823 0.0624 1.5141 0.1040 0.0624 0.1 0.169 Q p 49 490 0.0180 0.0702 1.8073 0.5254 0.0430 1.5835 0.0694 0.0430 0.1 .1Z 50 500 0.0134 0.0523 1.8595 0.5581 0.0327 1.6352 0.0517 0.0327 0.1 0.093 51 510 0.0134 0.0523 1.9118 0.5914 0.0333 1.6870 0.0517 0.0333 0.1 0.075 52 520 0.0134 0.0523 1.9640 0.6252 0.0338 1.7387 0.0518 0.0338 0.1 0.070 53 530 0.0088 0.0343 1.9984 0.6476 0.0225 1.7727 0.0340 0.0225 0.0 0.061 54 540 0.0088 0.0343 2.0327 0.6703 0.0227 1.8067 0.0340 0.0227 0.0 0.050 55 550 0.0088 0.0343 2.0670 0.6932 0.0229 1.8408 0.0340 0.0229 0.0 0.047 56 560 0.0088 0.0343 2.1013 0.7163 0.0231 1.8748 0.0340 0.0231 0.0 0.046 57 570 0.0088 0.0343 2.1356 0.7396 0.0233 1.9089 0.0340 0.0233 0.0 0.046 58 580 0.0088 0.0343 2.1700 0.7631 0.0235 1.9429 0.0341 0.0235 0.0 0.047 59 590 0.0088 0.0343 2.2043 0.7868 0.0237 1.9770 0.0341 0.0237 0.0 0.047 60 600 0.0088 0.0343 2.2386 0.8107 0.0239 2.0110 0.0341 0.0239 0.0 0.047 61 610 0.0088 0.0343 2.2729 0.8347 0.0240 2.0451 0.0341 0.0240 0.0 0.048 62 620 0.0088 0.0343 2.3072 0.8590 0.0242 2.0792 0.0341 0.0242 0.0 0.048 63 630 0.0088 0.0343 2.3416 0.8833 0.0244 2.1133 0.0341 0.0244 0.0 0.048 64 640 0.0088 0.0343 2.3759 0.9079 0.0246 2.1474 0.0341 0.0246 0.0 0.049 65 650 0.0072 0.0281 2.4040 0.9281 0.0202 2.1753 0.0279 0.0202 0.0 0.046 66 660 0.0072 0.0281 2.4320 0.9484 0.0203 2.2032 0.0279 0.0203 0.0 0.042 67 670 0.0072 0.0281 2.4601 0.9688 0.0204 2.2311 0.0279 0.0204 0.0 0.041 68 680 0.0072 0.0281 2.4882 0.9894 0.0205 2.2590 0.0279 0.0205 0.0 0.041 69 690 0.0072 0.0281 2.5163 1.0100 0.0206 2.2869 0.0279 0.0206 0.0 0.041 70 700 0.0072 0.0281 2.5444 1.0307 0.0207 2.3148 0.0279 0.0207 0.0 0.041' 71 710 0.0072 0.0281 2.5724 1.0515 0.0208 2.3428 0.0279 0.0208 0.0 0.041 72 720 0.0072 0.0281 2.6005 1.0724 0.0209 2.3707 0.0279 0.0209 0.0 0.042 73 730 0.0072 0.0281 2.6286 1.0934 0.0210 2.3986 0.0279 0.0210 0.0 0.042 74 740 0.0072 0.0281 2.6567 1.1145 0.0211 2.4266 0.0279 0.0211 0.0 0.042 75 750 0.0072 0.0281 2.6848 1.1357 0.0212 2.4545 0.0279 0.0212 0.0 0.042 76 760 0.0072 0.0281 2.7128 1.1569 0.0213 2.4824 0.0279 0.0213 0.0 0.042 77 770 0.0057 0.0222 2.7351 1.1738 0.0169 2.5045 0.0221 0.0169 0.0 0.039 78 780 0.0057 0.0222 2.7573 1.1908 0.0169 2.5267 0.0221 0.0169 0.0 0.036 79 790 0.0057 0.0222 2.7795 1.2078 0.0170 2.5488 0.0221 0.0170 0.0 0.034 80 800 0.0057 0.0222 2.8018 1.2248 0.0170 2.5709 0.0221 0.0170 0.0 0.034 81 810 0.0057 0.0222 2.8240 1.2419 0.0171 2.5930 0.0221 0.0171 0.0 0.034 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 82 820 0.0057 0.0222 2.8462 1.2591 0.0171 2.6152 0.0221 0.0171 0.0 0.034 83 830 0.0057 0.0222 2.8685 1.2763 0.0172 2.6373 0.0221 0.0172 0.0 0.034 84 840 0.0057 0.0222 2.8907 1.2935 0.0172 2.6594 0.0221 0.0172 0.0 0.034 85 850 0.0057 0.0222 2.9129 1.3108 0.0173 2.6816 0.0221 0.0173 0.0 0.034 86 860 0.0057 0.0222 2.9351 1.3281 0.0173 2.7037 0.0221 0.0173 0.0 0.035 87 870 0.0057 0.0222 2.9574 1.3455 0.0174 2.7258 0.0221 0.0174 0.0 0.035 88 880 0.0057 0.0222 2.9796 1.3630 0.0174 2.7480 0.0221 0.0174 0.0 0.035 89 890 0.0050 0.0195 2.9991 1.3783 0.0153 2.7674 0.0194 0.0153 0.0 0.033 90 900 0.0050 0.0195 3.0186 1.3936 0.0154 2.7868 0.0194 0.0154 0.0 0.032 91 910 0.0050 0.0195 3.0381 1.4090 0.0154 2.8062 0.0194 0.0154 0.0 0.031 92 920 0.0050 0.0195 3.0576 1.4245 0.0154 2.8256 0.0194 0.0154 0.0 0.031 93 930 0.0050 0.0195 3.0771 1.4399 0.0155 2.8451 0.0194 0.0155 0.0 0.031 94 940 0.0050 0.0195 3.0966 1.4554 0.0155 2.8645 0.0194 0.0155 0.0 0.031 95 950 0.0050 0.0195 3.1161 1.4709 0.0155 2.8839 0.0194 0.0155 0.0 0.031 96 960 0.0050 0.0195 3.1356 1.4865 0.0156 2.9033 0.0194 0.0156 0.0 0.031 97 970 0.0050 0.0195 3.1551 1.5021 0.0156 2.9228 0.0194 0.0156 0.0 0.031 98 980 0.0050 0.0195 3.1746 1.5177 0.0156 2.9422 0.0194 0.0156 0.0 0.031 99 990 0.0050 0.0195 3.1941 1.5334 0.0157 2.9616 0.0194 0.0157 0.0 0.031 100 1000 0.0050 0.0195 3.2136 1.5490 0.0157 2.9810 0.0194 0.0157 0.0 0.031 101 1010 0.0040 0.0156 3.2292 1.5616 0.0126 2.9966 0.0155 0.0126 0.0 0.029 102 1020 0.0040 0.0156 3.2448 1.5742 0.0126 3.0121 0.0155 0.0126 0.0 0.026 103 1030 0.0040 0.0156 3.2604 1.5868 0.0126 3.0277 0.0155 0.0126 0.0 0.026 104 1040 0.0040 0.0156 3.2760 1.5994 0.0126 3.0432 0.0155 0.0126 0.0 0.025 105 1050 0.0040 0.0156 3.2916 1.6121 0.0126 3.0588 0.0155 0.0126 0.0 0.025 106 1060 0.0040 0.0156 3.3072 1.6247 0.0127 3.0743 0.0155 0.0127 0.0 0.025 107 1070 0.0040 0.0156 3.3228 1.6374 0.0127 3.0898 0.0155 0.0127 0.0 0.025 108 1080 0.0040 0.0156 3.3384 1.6501 0.0127 3.1054 0.0155 0.0127 0.0 0.025 109 1090 0.0040 0.0156 3.3540 1.6628 0.0127 3.1209 0.0155 0.0127 0.0 0.025 110 1100 0.0040 0.0156 3.3696 1.6755 0.0127 3.1365 0.0155 0.0127 0.0 0.025 111 1110 0.0040 0.0156 3.3852 1.6883 0.0127 3.1520 0.0155 0.0127 0.0 0.025 112 1120 0.0040 0.0156 3.4008 1.7010 0.0128 3.1676 0.0155 0.0128 0.0 0.025 113 1130 0.0040 0.0156 3,4164 1.7138 0.0128 3.1831 0.0155 0.0128 0.0 0.025 114 1140 0.0040 0.0156 3.4320 1.7266 0.0128 3.1987 0.0155 0.0128 0.0 0.026 115 1150 0.0040 0.0156 3.4476 1.7394 0.0128 3.2142 0.0155 0.0128 0.0 0.026 116 1160 0.0040 0.0156 3.4632 1.7523 0.0128 3.2298 0.0156 0.0128 0.0 0.026 117 1170 0.0040 0.0156 3.4788 1.7651 0.0128 3.2453 0.0156 0.0128 0.0 0.026 118 1180 0.0040 0.0156 3.4944 1.7780 0.0129 3.2609 0.0156 0.0129 0.0 0.026 119 1190 0.0040 0.0156 3.5100 1.7909 0.0129 3.2764 0.0156 0.0129 0.0 0.026 120 1200 0.0040 0.0156 3.5256 1.8038 0.0129 3.2920 0.0156 0.0129 0.0 0.026 121 1210 0.0040 0.0156 3.5412 1.8167 0.0129 3.3075 0.0156 0.0129 0.0 0.026 122 1220 0.0040 0.0156 3.5568 1.8296 0.0129 3.3231 0.0156 0.0129 0.0 0.026 123 1230 0.0040 0.0156 3.5724 1.8426 0.0129 3.3387 0.0156 0.0129 0.0 0.026 124 1240 0.0040 0.0156 3.5880 1.8555 0.0130 3.3542 0.0156 0.0130 0.0 0.026 125 1250 0.0040 0.0156 3.6036 1.8685 0.0130 3.3698 0.0156 0.0130 0.0 0.026 126 1260 0.0040 0.0156 3.6192 1.8815 0.0130 3.3853 0.0156 0.0130 0.0 0.026 127 1270 0.0040 0.0156 3.6348 1.8945 0.0130 3.4009 0.0156 0.0130 0.0 0.026 128 1280 0.0040 0.0156 3.6504 1.9075 0.0130 3.4164 0.0156 0.0130 0.0 0.026 129 1290 0.0040 0.0156 3.6660 1.9205 0.0130 3.4320 0.0156 0.0130 0.0 0.026 130 1300 0.0040 0.0156 3.6816 1.9336 0.0131 3.4475 0.0156 0.0131 0.0 0.026 131 1310 0.0040 0.0156 3.6972 1.9467 0.0131 3.4631 0.0156 0.0131 0.0 0.026 132 1320 0.0040 0.0156 3.7128 1.9597 0.0131 3.4786 0.0156 0.0131 0.0 0.026 133 1330 0.0040 0.0156 3.7284 1.9728 0.0131 3.4942 0.0156 0.0131 0.0 0.026 134 1340 0.0040 0.0156 3.7440 1.9859 0.0131 3.5098 0.0156 0.0131 0.0 0.026 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 135 1350 0.0040 0.0156 3.7596 1.9991 0.0131 3.5253 0.0156 0.0131 0.0 0.026 136 1360 0.0040 0.0156 3.7752 2.0122 0.0131 3.5409 0.0156 0.0131 0.0 0.026 137 1370 0.0040 0.0156 3.7908 2.0253 0.0132 3.5564 0.0156 0.0132 0.0 0.026 138 1380 0.0040 0.0156 3.8064 2.0385 0.0132 3.5720 0.0156 0.0132 0.0 0.026 139 1390 0.0040 0.0156 3.8220 2.0517 0.0132 3.5876 0.0156 0.0132 0.0 0.026 140 1400 0.0040 0.0156 3.8376 2.0649 0.0132 3.6031 0.0156 0.0132 0.0 0.026 141 1410 0.0040 0.0156 3.8532 2.0781 0.0132 3.6187 0.0156 0.0132 0.0 0.026 142 1420 0.0040 0.0156 3.8688 2.0913 0.0132 3.6342 0.0156 0.0132 0.0 0.026 143 1430 0.0040 0.0156 3.8844 2.1045 0.0132 3.6498 0.0156 0.0132 0.0 0.026 144 1440 0.0040 0.0156 3.9000 2.1178 0.0132 3.6654 0.0156 0.0132 0.0 0.026 Total Volume of Runoff= 2521.028 cu. ft. (Found by summing this column and multiplying by 600. 600 is the conversion required to convert SUM(Q)in cfs to total volume in cubic feet as follows: V=SUM(Q)x dt (cu.ft.)_(cu.ft/s)x(10 min.)x(60 s/min.) STORMWATER CALCULATION MATRIX-SANTA BARBARA HYDROGRAPGH METHOD Date: Sep-03 Given: Project= TWALITY-PARKING LOT Area = 0.33 acres Pt = 3.9 inches 25-Year/24 Hour Storm dt = 10 min. Tc = 5 min. (Post-Developed Site Conditions) PERVIOUS Parcel IMPERVIOUS Parcel Area = 0 acres Area = 0.33 acres CN = 80 CN = 98 S = 2.50 S = 0.20 0.2S = 0.50 0.2S = 0.04 Compute:Developed Conditions Runoff hydrograph Column(3)=SCS Type IA Rainfall Distribution Column (4)=Col. (3)x Pt= 10 year-24 Hour Hyetograph at this location. Column (5)=Accumulated Sum of Col. (4) Column(6)=[If P<=0.2S] =0; Note, use PERVIOUS Area"S"value. [If P>0.2S] =(Col.(5)-0.2S)^2/(Col.(5)+0.8S); Using the PERVIOUS Area"S"value. Column(7)= Col.(6)of Present Time Step- Col.(6)of Previous Time Step Column(8)=Same method as for Col.(6), except use the IMPERVIOUS Area"S"value. Column(9)=Col.(8)of the present time step-Col.(8)of the previous time step. Column(10)_((PERVIOUS area/Total area)x Col.(7))+((IMPERVIOUS area/Total area)x Col.(9)) Column(11)=(60.5 x Col.(10)x Total Area)/10(dt= 10 minutes) Routing Constant,w=dt/(2Tc+dt) = 0.5000 Column(12)=Col.(12)of Previous Time Step+(w x[Col.(11)of Previous Time Step +Col.(11)of Present Time Step-(2 x Col.(12)of Previous Time Step)]) Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. %of Pt in. in. in. in. in. in. in. cfs cfs 1 10 0.0040 0.0156 0.0156 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 2 20 0.0040 0.0156 0.0312 0.0000 0.0000 0.0000 0.0000 0.0000 0.0 0.000 3 30 0.0040 0.0156 0.0468 0.0000 0.0000 0.0002 0.0002 0.0002 0.0 0.000 4 40 0.0040 0.0156 0.0624 0.0000 0.0000 0.0021 0.0019 0.0019 0.0 0.002 5 50 0.0040 0.0156 0.0780 0.0000 0.0000 0.0057 0.0037 0.0037 0.0 0.006 6 60 0.0040 0.0156 0.0936 0.0000 0.0000 0.0108 0.0051 0.0051 0.0 0.009 7 70 0.0040 0.0156 0.1092 0.0000 0.0000 0.0172 0.0063 0.0063 0.0 0.011 8 80 0.0040 0.0156 0.1248 0.0000 0.0000 0.0245 0.0073 0.0073 0.0 0.014 9 90 0.0040 0.0156 0.1404 0.0000 0.0000 0.0327 0.0082 0.0082 0.0 0.015 10 100 0.0040 0.0156 0.1560 0.0000 0.0000 0.0416 0.0089 0.0089 0.0 0.017 11 110 0.0050 0.0195 0.1755 0.0000 0.0000 0.0535 0.0120 0.0120 0.0 0.021 12 120 0.0050 0.0195 0.1950 0.0000 0.0000 0.0664 0.0128 0.0128 0.0 0.025 13 130 0.0050 0.0195 0.2145 0.0000 0.0000 0.0799 0.0135 0.0135 0.0 0.026 14 140 0.0050 0.0195 0.2340 0.0000 0.0000 0.0939 0.0141 0.0141 0.0 0.028 15 150 0.0050 0.0195 0.2535 0.0000 0.0000 0.1085 0.0146 0.0146 0.0 0.029 16 160 0.0050 0.0195 0.2730 0.0000 0.0000 0.1236 0.0150 0.0150 0.0 0.030 17 170 0.0060 0.0234 0.2964 0.0000 0.0000 0.1421 0.0185 0.0185 0.0 0.034 18 180 0.0060 0.0234 0.3198 0.0000 0.0000 0.1611 0.0190 0.0190 0.0 0.037 19 190 0.0060 0.0234 0.3432 0.0000 0.0000 0.1805 0.0194 0.0194 0.0 0.038 20 200 0.0060 0.0234 0.3666 0.0000 0.0000 0.2003 0.0198 0.0198 0.0 0.039 21 210 0.0060 0.0234 0.3900 0.0000 0.0000 0.2204 0.0201 0.0201 0.0 0.040 22 220 0.0060 0.0234 0.4134 0.0000 0.0000 0.2407 0.0203 0.0203 0.0 0.040 23 230 0.0070 0.0273 0.4407 0.0000 0.0000 0.2648 0.0240 0.0240 0.0 0.044 24 240 0.0070 0.0273 0.4680 0.0000 0.0000 0.2891 0.0243 0.0243 0.0 0.048 25 250 0.0070 0.0273 0.4953 0.0000 0.0000 0.3136 0.0246 0.0246 0.0 0.049 26 260 0.0070 0.0273 0.5226 0.0002 0.0002 0.3384 0.0248 0.0248 0.0 0.049 27 270 0.0070 0.0273 0.5499 0.0010 0.0008 0.3634 0.0250 0.0250 0.0 0.050 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 28 280 0.0070 0.0273 0.5772 0.0023 0.0013 0.3885 0.0251 0.0251 0.1 0.050 29 290 0.0082 0.0320 0.6092 0.0046 0.0023 0.4182 0.0297 0.0297 0.1 0.055 30 300 0.0082 0.0320 0.6412 0.0075 0.0030 0.4480 0.0298 0.0298 0.1 0.059 31 310 0.0082 0.0320 0.6731 0.0112 0.0037 0.4780 0.0300 0.0300 0.1 0.060 32 320 0.0082 0.0320 0.7051 0.0156 0.0043 0.5082 0.0301 0.0301 0.1 0.060 33 330 0.0082 0.0320 0.7371 0.0205 0.0050 0.5385 0.0303 0.0303 0.1 0.060 34 340 0.0082 0.0320 0.7691 0.0261 0.0056 0.5689 0.0304 0.0304 0.1 0.061 35 350 0.0095 0.0371 0.8061 0.0334 0.0072 0.6042 0.0353 0.0353 0.1 0.066 36 360 0.0095 0.0371 0.8432 0.0414 0.0080 0.6397 0.0355 0.0355 0.1 0.071 37 370 0.0095 0.0371 0.8802 0.0502 0.0088 0.6752 0.0356 0.0356 0.1 0.071 38 380 0.0095 0.0371 0.9173 0.0597 0.0095 0.7109 0.0357 0.0357 0.1 0.071 39 390 0.0095 0.0371 0.9543 0.0699 0.0102 0.7467 0.0358 0.0358 0.1 0.071 40 400 0.0095 0.0371 0.9914 0.0807 0.0108 0.7826 0.0359 0.0359 0.1 0.072 41 410 0.0134 0.0523 1.0436 0.0971 0.0164 0.8333 0.0507 0.0507 0.1 0.086 42 420 0.0134 0.0523 1.0959 0.1147 0.0176 0.8841 0.0508 0.0508 0.1 0.101 43 430 0.0134 0.0523 1.1482 0.1334 0.0187 0.9350 0.0509 0.0509 0.1 0.102 44 440 0.0180 0.0702 1.2184 0.1603 0.0269 1.0036 0.0686 0.0686 0.1 0.119 45 450 0.0180 0.0702 1.2886 0.1891 0.0287 1.0723 0.0687 0.0687 0.1 0.137 46 460 0.0340 0.1326 1.4212 0.2480 0.0589 1.2025 0.1302 0.1302 0.3 _0199 47 470 0.0540 0.2106 1.6318 0.3527 0.1047 1.4101 0.2075 0.2075 0.4 (/ 0.337 48 480 0.0270 0.1053 1.7371 0.4095 0.0568 1.5141 0.1040 0.1040 0.2 �Q31LQ eak 49 490 0.0180 0.0702 1.8073 0.4489 0.0394 1.5835 0.0694 0.0694 0.1 0.173 50 500 0.0134 0.0523 1.8595 0.4789 0.0300 1.6352 0.0517 0.0517 0.1 0.121 51 510 0.0134 0.0523 1.9118 0.5095 0.0306 1.6870 0.0517 0.0517 0.1 0.103 52 520 0.0134 0.0523 1.9640 0.5407 0.0312 1.7387 0.0518 0.0518 0.1 0.103 53 530 0.0088 0.0343 1.9984 0.5615 0.0208 1.7727 0.0340 0.0340 0.1 0.086 54 540 0.0088 0.0343 2.0327 0.5825 0.0210 1.8067 0.0340 0.0340 0.1 0.068 55 550 0.0088 0.0343 2.0670 0.6038 0.0212 1.8408 0.0340 0.0340 0.1 0.068 56 560 0.0088 0.0343 2.1013 0.6252 0.0215 1.8748 0.0340 0.0340 0.1 0.068 57 570 0.0088 0.0343 2.1356 0.6469 0.0217 1.9089 0.0340 0.0340 0.1 0.068 58 580 0.0088 0.0343 2.1700 0.6688 0.0219 1.9429 0.0341 0.0341 0.1 0.068 59 590 0.0088 0.0343 2.2043 0.6909 0.0221 1.9770 0.0341 0.0341 0.1 0.068 60 600 0.0088 0.0343 2.2386 0.7131 0.0223 2.0110 0.0341 0.0341 0.1 0.068 61 610 0.0088 0.0343 2.2729 0.7356 0.0225 2.0451 0.0341 0.0341 0.1 0.068 62 620 0.0088 0.0343 2.3072 0.7583 0.0227 2.0792 0.0341 0.0341 0.1 0.068 63 630 0.0088 0.0343 2.3416 0.7811 0.0228 2.1133 0.0341 0.0341 0.1 0.068 64 640 0.0088 0.0343 2.3759 0.8042 0.0230 2.1474 0.0341 0.0341 0.1 0.068 65 650 0.0072 0.0281 2.4040 0.8231 0.0190 2.1753 0.0279 0.0279 0.1 0.062 66 660 0.0072 0.0281 2.4320 0.8422 0.0191 2.2032 0.0279 0.0279 0.1 0.056 67 670 0.0072 0.0281 2.4601 0.8614 0.0192 2.2311 0.0279 0.0279 0.1 0.056 68 680 0.0072 0.0281 2.4882 0.8807 0.0193 2.2590 0.0279 0.0279 0.1 0.056 69 690 0.0072 0.0281 2.5163 0.9002 0.0194 2.2869 0.0279 0.0279 0.1 0.056 70 700 0.0072 0.0281 2.5444 0.9197 0.0195 2.3148 0.0279 0.0279 0.1 0.056 71 710 0.0072 0.0281 2.5724 0.9393 0.0196 2.3428 0.0279 0.0279 0.1 0.056 72 720 0.0072 0.0281 2.6005 0.9591 0.0197 2.3707 0.0279 0.0279 0.1 0.056 73 730 0.0072 0.0281 2.6286 0.9789 0.0198 2.3986 0.0279 0.0279 0.1 0.056 74 740 0.0072 0.0281 2.6567 0.9988 0.0199 2.4266 0.0279 0.0279 0.1 0.056 75 750 0.0072 0.0281 2.6848 1.0189 0.0200 2.4545 0.0279 0.0279 0.1 0.056 76 760 0.0072 0.0281 2.7128 1.0390 0.0201 2.4824 0.0279 0.0279 0.1 0.056 77 770 0.0057 0.0222 2.7351 1.0550 0.0160 2.5045 0.0221 0.0221 0.0 0.050 78 780 0.0057 0.0222 2.7573 1.0711 0.0161 2.5267 0.0221 0.0221 0.0 0.044 79 790 0.0057 0.0222 2.7795 1.0872 0.0161 2.5488 0.0221 0.0221 0.0 0.044 80 800 0.0057 0.0222 2.8018 1.1034 0.0162 2.5709 0.0221 0.0221 0.0 0.044 81 810 0.0057 0.0222 2.8240 1.1196 0.0162 2.5930 0.0221 0.0221 0.0 0.044 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 82 820 0.0057 0.0222 2.8462 1.1359 0.0163 2.6152 0.0221 0.0221 0.0 0.044 83 830 0.0057 0.0222 2.8685 1.1522 0.0163 2.6373 0.0221 0.0221 0.0 0.044 84 840 0.0057 0.0222 2.8907 1.1686 0.0164 2.6594 0.0221 0.0221 0.0 0.044 85 850 0.0057 0.0222 2.9129 1.1851 0.0164 2.6816 0.0221 0.0221 0.0 0.044 86 860 0.0057 0.0222 2.9351 1.2016 0.0165 2.7037 0.0221 0.0221 0.0 0.044 87 870 0.0057 0.0222 2.9574 1.2181 0.0166 2.7258 0.0221 0.0221 0.0 0.044 88 880 0.0057 0.0222 2.9796 1.2347 0.0166 2.7480 0.0221 0.0221 0.0 0.044 89 890 0.0050 0.0195 2.9991 1.2493 0.0146 2.7674 0.0194 0.0194 0.0 0.041 90 900 0.0050 0.0195 3.0186 1.2640 0.0146 2.7868 0.0194 0.0194 0.0 0.039 91 910 0.0050 0.0195 3.0381 1.2786 0.0147 2.8062 0.0194 0.0194 0.0 0.039 92 920 0.0050 0.0195 3.0576 1.2934 0.0147 2.8256 0.0194 0.0194 0.0 0.039 93 930 0.0050 0.0195 3.0771 1.3081 0.0148 2.8451 0.0194 0.0194 0.0 0.039 94 940 0.0050 0.0195 3.0966 1.3229 0.0148 2.8645 0.0194 0.0194 0.0 0.039 95 950 0.0050 0.0195 3.1161 1.3377 0.0148 2.8839 0.0194 0.0194 0.0 0.039 96 960 0.0050 0.0195 3.1356 1.3526 0.0149 2.9033 0.0194 0.0194 0.0 0.039 97 970 0.0050 0.0195 3.1551 1.3675 0.0149 2.9228 0.0194 0.0194 0.0 0.039 98 980 0.0050 0.0195 3.1746 1.3824 0.0149 2.9422 0.0194 0.0194 0.0 0.039 99 990 0.0050 0.0195 3.1941 1.3974 0.0150 2.9616 0.0194 0.0194 0.0 0.039 100 1000 0.0050 0.0195 3.2136 1.4124 0.0150 2.9810 0.0194 0.0194 0.0 0.039 101 1010 0.0040 0.0156 3.2292 1.4244 0.0120 2.9966 0.0155 0.0155 0.0 0.035 102 1020 0.0040 0.0156 3.2448 1.4365 0.0120 3.0121 0.0155 0.0155 0.0 0.031 103 1030 0.0040 0.0156 3.2604 1.4485 0.0121 3.0277 0.0155 0.0155 0.0 0.031 104 1040 0.0040 0.0156 3.2760 1.4606 0.0121 3.0432 0.0155 0.0155 0.0 0.031 105 1050 0.0040 0.0156 3.2916 1.4727 0.0121 3.0588 0.0155 0.0155 0.0 0.031 106 1060 0.0040 0.0156 3.3072 1.4848 0.0121 3.0743 0.0155 0.0155 0.0 0.031 107 1070 0.0040 0.0156 3.3228 1.4970 0.0121 3.0898 0.0155 0.0155 0.0 0.031 108 1080 0.0040 0.0156 3.3384 1.5092 0.0122 3.1054 0.0155 0.0155 0.0 0.031 109 1090 0.0040 0.0156 3.3540 1.5214 0.0122 3.1209 0.0155 0.0155 0.0 0.031 110 1100 0.0040 0.0156 3.3696 1.5336 0.0122 3.1365 0.0155 0.0155 0.0 0.031 111 1110 0.0040 0.0156 3.3852 1.5458 0.0122 3.1520 0.0155 0.0155 0.0 0.031 112 1120 0.0040 0.0156 3.4008 1.5580 0.0122 3.1676 '0.0155 0.0155 0.0 0.031 113 1130 0.0040 0.0156 3.4164 1.5703 0.0123 3.1831 0.0155 0.0155 0.0 0.031 114 1140 0.0040 0.0156 3.4320 1.5826 0.0123 3.1987 0.0155 0.0155 0.0 0.031 115 1150 0.0040 0.0156 3.4476 1.5949 0.0123 3.2142 0.0155 0.0155 0.0 0.031 116 1160 0.0040 0.0156 3.4632 1.6072 0.0123 3.2298 0.0156 0.0156 0.0 0.031 117 1170 0.0040 0.0156 3.4788 1.6196 0.0123 3.2453 0.0156 0.0156 0.0 0.031 118 1180 0.0040 0.0156 3.4944 1.6319 0.0124 3.2609 0.0156 0.0156 0.0 0.031 119 1190 0.0040 0.0156 3.5100 1.6443 0.0124 3.2764 0.0156 0.0156 0.0 0.031 120 1200 0.0040 0.0156 3.5256 1.6567 0.0124 3.2920 0.0156 0.0156 0.0 0.031 121 1210 0.0040 0.0156 3.5412 1.6691 0.0124 3.3075 0.0156 0.0156 0.0 0.031 122 1220 0.0040 0.0156 3.5568 1.6815 0.0124 3.3231 0.0156 0.0156 0.0 0.031 123 1230 0.0040 0.0156 3.5724 1.6940 0.0125 3.3387 0.0156 0.0156 0.0 0.031 124 1240 0.0040 0.0156 3.5880 1.7065 0.0125 3.3542 0.0156 0.0156 0.0 0.031 125 1250 0.0040 0.0156 3.6036 1.7190 0.0125 3.3698 0.0156 0.0156 0.0 0.031 126 1260 0.0040 0.0156 3.6192 1.7315 0.0125 3.3853 0.0156 0.0156 0.0 0.031 127 1270 0.0040 0.0156 3.6348 1.7440 0.0125 3.4009 0.0156 0.0156 0.0 0.031 128 1280 0.0040 0.0156 3.6504 1.7565 0.0125 3.4164 0.0156 0.0156 0.0 0.031 129 1290 0.0040 0.0156 3.6660 1.7691 0.0126 3.4320 0.0156 0.0156 0.0 0.031 130 1300 0.0040 0.0156 3.6816 1.7816 0.0126 3.4475 0.0156 0.0156 0.0 0.031 131 1310 0.0040 0.0156 3.6972 1.7942 0.0126 3.4631 0.0156 0.0156 0.0 0.031 132 1320 0.0040 0.0156 3.7128 1.8068 0.0126 3.4786 0.0156 0.0156 0.0 0.031 133 1330 0.0040 0.0156 3.7284 1.8195 0.0126 3.4942 0.0156 0.0156 0.0 0.031 _ 134 1340 0.0040 0.0156 3.7440 1.8321 0.0126 3.5098 0.0156 0.0156 0.0 0.031 Pervious Area Impervious Area (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) Time Time Rainfall Incre- Accumu- Accumu- Incre- Accumu- Incre- Total Instant design Increment distri- mental lated lated mental lated mental Runoff hydro- hydro- bution Rainfall Rainfall Runoff Runoff Runoff Runoff graph graph min. in. in. in. in. in. in. in. cfs cfs 135 1350 0.0040 0.0156 3.7596 1.8447 0.0127 3.5253 0.0156 0.0156 0.0 0.031 136 1360 0.0040 0.0156 3.7752 1.8574 0.0127 3.5409 0.0156 0.0156 0.0 0.031 137 1370 0.0040 0.0156 3.7908 1.8701 0.0127 3.5564 0.0156 0.0156 0.0 0.031 138 1380 0.0040 0.0156 3.8064 1.8828 0.0127 3.5720 0.0156 0.0156 0.0 0.031 139 1390 0.0040 0.0156 3.8220 1.8955 0.0127 3.5876 0.0156 0.0156 0.0 0.031 140 1400 0.0040 0.0156 3.8376 1.9082 0.0127 3.6031 0.0156 0.0156 0.0 0.031 141 1410 0.0040 0.0156 3.8532 1.9210 0.0127 3.6187 0.0156 0.0156 0.0 0.031 142 1420 0.0040 0.0156 3.8688 1.9338 0.0128 3.6342 0.0156 0.0156 0.0 0.031 143 1430 0.0040 0.0156 3.8844 1.9465 0.0128 3.6498 0.0156 0.0156 0.0 0.031 144 1440 0.0040 0.0156 3.9000 1.9593 0.0128 3.6654 0.0156 0.0156 0.0 0.031 Total Volume of Runoff= 4381.405 cu.ft. (Found by summing this column and multiplying by 600. 600 is the conversion required to convert SUM(Q)in cfs to total volume in cubic feet as follows: V=SUM(Q)x dt (cu.ft.)_(cu.fUs)x(10 min.)x(60 s/min.) Water Quality DATA BLOCK ONE -CARTRIDGE STEEL CATCH BASIN STORNIF LTER STRUCTURE CALLOUT ID WATER QUALITY FLOW (CFS) CONVEYANCE FLOW (CFS) RETURN PERIOD OF PEAK FLOW MEDIA TYPE RIM ELEVATION (CHECK: RIM - IE-OUT = 2.3') I.E. DIAMETER INLET STUB OUTLET STUB CIRCLE CONFIGURATION: OUTLET OUTLET • ^ I O O , INLET INLET OPTIONS (AVAILABLE AT EXTRA COST): ❑ OUTLET STUB - OTHER THAN 8" DIAMETER ❑ INLET STUB ❑ OTHER: STORMWATER - 41F1x MANAGEMENT INC. 12021-8 N.E. AIRPORT WAY. PORTLAND, OR 97220 (503) 240-3393 • FAX: (503) 240-9553 SHCET °°'°°"ear "ma,°"_ °`°cwt. CATCH BASIN STORMF7LTER isc w wia opt. 2/4 do r a, . o 'av ,r„ ONE-CARTRIDGE STEEL UNIT 2 DATA BLOCK w AA WALL L• PAWICCT Np_ OMYNC FLE NWC; _ Pt II_ �wc Tom CAW—,_ r •r r IN C1. 0 s REINFORCING BM29 MATH .. NOTES: . MININUM 4- OVERLAP RADIAL FLOW 6' OWLET 1.) STORMFll1ER DT ST0rnAWATER MANAGEMENT INC., PORTLAND. OREGON (BOO/SA0-4807). k FOR IERMETER SLAB CARTROGE PPE STUB (STD) „ v. r (ITT CONTRACTOR) 0 4 2.) CATCH BSSIN MUST PE SET LEVEL ,�� L7 3.) ExTERNAI PIPING AND COUPLINGS TO BE PROVIOED BT OTHERS. W 4.) FLEXIBLE court INC 10 BE USED AT INLE1 do OUTLET. FERNOO OR ENGINEER APPROVED. • 5.) PERIMETER SLAB TO 0E PROVIDED BY CONTRACTOR S; B.) STORMBLTER REQUIRES REGULAR MAINTENANCE REFER TO OPERATION AND MAINTENANCE iii!'; ��• • MANUAL FUR DETAILS. _ �� 1� A 7.) CATCH BASIN STORMFILTER STRUCTURAL SPECIFICATIONS:A l�.c?!61■ si LOAD RATING: 70.000 LB. A . Irrvi∎zi∎Slm I CONSTRUCDON: 1/4- STEEL PLATE • ,`�^��`11 ! 11�_. COATING: CORROSION RESISTANT, ALL SURFACES ::`;:\.'•,�( ``7� 1 UNR WEIGHT: 850 LP. _ INLET GRA1 E: DUCTILE IRON B0 y/ I I I I!,,�1iL PERIMETER SLAB REQUIRED II MI UrnNO EYE (MI) d�Ilk i R SOLD UD INLET CRATE U STUB (OPIIONAI) z Y r. 6+ J CA1CH BASIN SIORMiILftR - PLAN VIEW lO a 6' el TJRE; w.r.s I D t W 28Q FE-ti 4 maz a OvQin_Ow •--• I PERIMETER SLAB HEIR CREST IL 3.000 PSI CONCRETE a Q (BY CONTRACTOR) ►.9,a Fw _wMOE NM Y ∎' 1 .• rt0►A- - IIw� 2-/4 TIFPFORCING BARS Z5 I —II — (B7 CONTRACTOR) j- ∎OTC AllsIii ILIei IILIBIJL11 II 6• B...... ■2§ [ a FLttR jj%j _I y avNtLn- ' , %%/, I INLET !'_]J .• H / ('. r-r __ EMSFLE "' _ ,....I=,.,.,. 6' OUTLET PPE ' 1 11 .1I1% STUB (510) M VAA1[S oVFAFLOW MFIR WRH FL101 FLIER cement NLEVOUTLEI mutiny CLEAN OUT 0H46ER I' r c I.CAHOU 1 OPENING OUTLET !•-I•—.- —T-L I/1• IN OVERFLOW MDR CA1CH BASIN SIORMfIL1ER - SECTION VIEW CATCH BASIN STORMFILTER - SECTION VIEW , 1 ECRU w.TAL SCALE Mal. I ECRU The BTORk1AT73 144A8ENB17 EMI S`-'"" INniiI U.6. t.nLEt No. 6•]�E,6f�, No. 6,707,6A7. Na 6,OR7,666, No. 6,111 1,676, AND MEI U.S. UM POwEMO11 PAILIRS Marten 6 C STEM CATCH BASIN STORMFILTER SPECIFICATIONS PART 1 GENERAL 2.2 STEEL CAIO4 BASIN COMPONENTS 1.1 SEC11CN N11UDE5 A. Steel Catch Bash: Catch Poen once be all veiled Ilea mnsenction, fabricated from 1/4-neh steel coated :rode 0114 021 with aIDnanic point Catch Bm(n Stain Ond rated for 2D.000 IP !maim. 12 OQATFD SEC110NS B. Catch RaeIn Crater Groting than be ductile iron oonetruatfon and rated for 20,000 lb loading_ Section ( 1: C. Catch Satin Said Lid: Solid lid 111011 De diamond-Clots construction 13 SU9.4ITTAIS .6k 7-inch angle name, all sides mated wan ammonia point, ore rated for 20,000 lb Icodinq. A. Stem-water Monagement tO submit shop ceOvirg to contractor for approval. 2.3 OONTRACTOR-PRONDEO I302PONENTS B. Storew•otr Management to eubrna Operation and l ainionarce Manual to A. Concrete: Shall be 3000 psi. 25 day strength. 3/4-incrl round rack. contractor 'f requested. 4-inch Sump rwm(irumh, placed whin 90 mnutee of .nitol rniairid. or as othemse specMea in the general technical spuccllcodone. PART 2 PRCOUC15 B. Rebor. Shol meet ASTM A-515M Code 4.20 (50 k51) cr as otherwise 21 INTEfd4AL COMPCI'QRS specifies In the worm tecnnrcal SO ecl7lc0dane. A. All 'Memel component's including PVC pipng• Alter cartrsge(s) and filter C. Sub-8aseb Shall 1. 6-inch minimum 01 3/4-loon minus r002 or as medic (a• seeerred in the Star milker dote blocs() •hal be prevfded by otherwise specrlred in the general technical eparil■cabons. Stor'aoter Management Inc, 2035 NE Columbia bad. Portend. OR 97211 (1300/5Ae-a657). 0. r3eokflll: Shdl be 3/4-inch rn,nus rook or as of sre,ee .pecrfed in the general technical speehoatiores. B. PVC (resins: NI ;nterrol PVC dieing and frltings snail mast ASTM 01785. PART 3 Ex ECVT10N C. rater Cartridge: 3.1 STEEL CATCH SAN 7. Cervrag• bdharw pd 01ner Ong, and flood sneer be canetruct•o nom (nice' low-density pdyetnylene. Cartridge screen shall eeriest Of dalranZaa A. Catch bodn floor shell b• set 'net and plump. 1- • t/2 "misled wire fabrc (15 poops minimum) vrth a bonded PVC coating. Internal parts shop cermet of Pn,C or ABS Pipe are fittings. B. Contractor roll Nevert 9edirnent and (learnt 'tom entering Vie Mier goon-prirning (loot roil be aOratruotsd from Pnea- or-mnerty unit during cast uctian. polyethylene_ Outer flier fabric snail be 10 a 95 clear fiberglass mesh. hoer Inter f pone anal on 10 1 B, clear fiberglass mesh aver fnsamat C. Co-Vector face compact sub-vase to 95% of rroslmurn densely or as 7210 or woven oolyetnyiene with a u5 StanMO'a Save '+20 opening al.. NI otr 12151 opal mod ay Ygfn Car. Jrtsurta Ohv matend pongee sup-gram snail rrimell0re0Uel 901001, nut*, and feetenrs mall oe alurninum or staiviaee 0e reploClo ere OiHtt10 q engner. dad. 0. 4 necessary, the inet cheroer may be Riled wkh Ilion vans t0 05eid 2 An Orfice plate snail be suop1bd with each cartridge to restrict floc in preventing Rotation during ooneuvetfon until the eruct-re a bo0s(filled rote IS gam mere"rnum. and the concrete color 'e poured. D. fiber Media: Fifer media shall be by Stnrrnwocer Oanagrrmnt err E. Contractor anal! COrnOact bOc K�I CO 0158 of rn07imum density or as approved alternate. Fitr media shall casfat of one or more of the o1Mni•s spsCmed Sy engineer. lapsing, as speerfied the Sternilter data blaaec T. Catch basin outlet shall be connected to do•nstreom (cad upstream, if 1. Penne MDafcc Psrttte media 171011 De rna0* of natural ellkorUs vctcanlc oppicable) piping using a flexible-type cadoing. loan free of any aeons or forelgn matter. The expanded Dent* In011 nave a bulk denehy rongno from 6.5 to 8.5 I0/113 and particle dzm ranging G. Concrete perimeter slab 1001 as <oretruc.sd 1 (cot Wqs and 6 inches Irarw 0.08 to 0.50 inanee. Nick. Sion snail include two 44 re0Cr neaps with minimum 6-inch ovenab et dwuro. Maw -inch Vertical spacing between heave and mnimurn 2. CST Leaf Nedioe CST Leaf medic shall be made o,elusi•ely of fallen 2-1ndh clearance from concrete euraces_ acCt.uaus loaves with loos OlOn Sx OF wafgnt Of woody or green yeas debt,* materials. flter Media small oe granular arc anal contrail ',ass than 32 f1UER CARTR10CE 0.571 favgm mesterei such vs doss or dodo corrtom:oonta. Maths anal be dry at the drne of installation. Colon Basin StarrnFlter snail a* planted <amerte with cartridge(*) and cortnege media metaled. The CST Leaf mledia bra11 hove a bulk density ranging barn 40 to 50 b/et3 and particle sizes roofing rrem 0.05 to 0.50 ;ranoe Mmdrnum eel 3.3 CLEANUP 0/ 0451 for liter media shall be Get'ned as: media 2055109 through 0 US Standard Sieve 04 anal have no mere than 10R (by cross of dry rheas) A. The proisot Ste droll be clean and 11-24 of art and debris Oerere runoff pawing a US Store pad Sieve #45. i1 clinesa t0 enter the tiller. Sit* w01% shall be in a complete condition as approved by the enamor. The project sale includes any surface that 3. Zeolite Media: Zeol naturally te media shall be made of narally occurring oentnhutee storm drainage to the system. elfnoptnorrte, .which nee a geological atrvelure of po nln-a01Lmn-eoalurn dlumindsilicot*. B.The tract/outlet charneer and filter chorroer(s) anal be free of construction debris and saQeen( Delon, the system is placed in Operation. The wale meta 31701 haw■ a bulk daneiy ranging ,nom 44- to 50 lb/ft3, pvifde sirs rongng Iron, 0.125 to 0.25 manse, and a cation esrhange C. Cadroetor arid! remove the 4-•ndx temporary construction olua(s) oopooity ranging from 1.0 to 2.2 rneq/g. between the inhe enamor and filter cnornber(s) tp pace this system in operation. 4. Ilan-rnu0eO Nacfa: 1100-Infueea rneaf0 Snail 04 macro from onancilc 14510 101050 wit71 00(1 particle. and paymeriZtd t0 cam open 1*1Mlar roam. D.the 0-mash clsanart plug h tn• overflow weft .ere snail remain h piece This stock materials mud be free of debris with the :ran pares. using for proper operation of the system. non-reactive and non-;ea.ed. The Yon-+nfueod n edia 41011 have a bulk density rengfng from 20 to 30 EN0 OT SECTION b/rt..l end parooee WEIRS ran(rng (ram 0.0 to 03 ',nave. 5. Pleated fabric heart Pleated fabrc neert moll be constructed vrth a minimum of 75 sq-m of fabric placed between two aluminum and cape with neoprene goatee. The a•eral dknenslans of the Insert 11111 be 18.0' 0D. w 115' I.D. a 1525' tal. The fabric shall meet the folhwlrg speclflcatiaree 14.0 pleats measuring 2.125' a 18.25': 10071 30 PE/PET Ofcompolent It0sr: 1110(1511 or IS rnfl5: Mullen SU1at of '35 per: and Coulter Parameter of 70 micron. qffE7 oars.on t10" .422.7 0*O Gm ace en. CATCH BASIN STORNF7LTeR ,y Down m _spa es(_ .e.t o.e. J/J snit I h .OVew ltAV .I'*e. ONE-CARTRIDGE STEEL UNIT .3 SPECJF1CAT/CNS fTOMIIIV WALL: i PROJECT MO. QOAVPC FIE-sec, 4/S 0000 -r-s. NASASIUIBT INC. ' uau;iswr CAT©CAT© 0=0 gAg ii 1M gt@PUR F d P 7Efeil .: it 1 .1IIIII —OYICt a >:ua 9 -.- . +t.a_ I 1, I ----,/ A A --yam Vii- ----_ A '" ti li it 1 ` .:,'./1.,t ''70,---.."'-'-. .7,.,_..:- :,,. 't•+r.:•,1^x, =. INLL'•:nor[. 8 f-' `ime,'oi.,rv,i STEEL CATCNIASP1 Store EPN:r PLAN .IEN (TN. j'� ; __'fir. ;; ; 1 4 r PS —— iIz•,+.rnw '* 0uc• ua• c,GNO:r..,,,..r,: I . _IN l0P:4l(W WElt i _ — ._1 1:: ii.i.: STEEL CA-C.1-,EA:.... Stor nfl sr - SECTION V.' ! _ E A-4t STEEL CA'.HBAS:N 3ta•r I•sr - SEC-ION .Sy 18-7. U.S.PATENT N0. 5.322.629, 5,624,576.AND OTHER U.S.AND FOREIGN PATENTS PENDING The Stormwater Management StormFilterc i is now available in a steel, concrete or plastic catch basin configuration. The CatchBasin Storm Filter system, an extension of the widely accepted StormFilter Best Management Practice, has been engineered to replace the standard catch basin. In the CatchBasin StormFilter, polluted runoff enters the system through a traffic-bearing grate. In the inlet chamber primary settling of the runoff occurs, and the heavier solids drop to a sump on the vault floor.The water is directed under a baffle into the filter chamber where the StormFilter cartridge is housed. During filtration, finer solids and soluble pollutants are removed. Clean water is discharged from the filter and directed around the overflow bypass weir to the outlet pipe. During heavy storms, when the flow exceeds the design flow,water in the inlet chamber spills over the bypass weir, preventing the re-suspension of { sediments and pollutants trapped in the cartridge chamber. I I I SYSTEM FEATURES AND BENEFITS GENERAL SPECIFICATIONS •Proven StormFilter technology targets site-specific pollutants •StormFilter capacity–5-15 gpmicartridge(up to 4 cartridges) !' •Low cost,heavy gauge,all steel construction •Peak hydraulic capacity–1.0 cfs or 3.0 cfs I •Internal bypass minimizes re-suspension of trapped pollutants •Hydraulic drop(Rim to Invert)–2.3'to 3.3' I I •Simple,low cost installation •Outlet pipe diameter–6"to 12" ;1 :1 •Easy maintenance supported by Stormwater Management •Load bearing capacity–H-20 rated i •Operation and Maintenance Guidelines available from •Optional corrosion-resistant powder coating I 1 I Stormwater Management Inc. .i I i •Also available in concrete and plastic t, II 11 JI 12021-8 NE Airport Way, Portland, OR 97220 (, 0800.548.4667 0800.561.1271 ©stormwaterinc.com UR Base Ao{iMr ■ CATC -'' akg 0 K M@Putt f 00 @PI� 1 1.-\-- -------,- ■ 1 \ � - — 1,______ . , , — I �__ \,_____. , - _ _ . ________ ____. i_. \__I I , it l , CONCRETE COLLAR • r � --- FILTER CHAMBER COVER ` u - X14. l'•-- -cam. GRATE&FRAME _ r� ., # . / .CS�-may � +� � I ! I -v • 4° 11 FILTER CHAMBER INLET s -ji SLOPED DIVERTER PLATE t _. llllli CARTRIDGE SUPPORT far i -. BEAMS(2) OVERFLOW WEIR CREST :. 1 l,` I 7 - Storm Filter CARTRIDGE SCUM BAFFLE •Y DEBRIS SUMP illkloo FILTER CHAMBER OUTLET DEBRIS SUMP n I I 1 -�--: OUTLET PIPE i CLEANOUT OPENING IN WEIR WITH HOLE S. EXPANSION PLUG { is ! i . Also available in concrete and plastic. 0144 _ STORMWATER MANAGEMENT INC . ( �; 12021-8 NE Airport Way, Portland, OR 97220 , G800.548.4667 Q800.561.1271 'Ostormwaterinc.com • 4, 4 . r , , _ , v b i t - _- , ,--- „,, •:'• 4.ef• .„_., ------- 0 — ----'‘ , , \ \ I i 1 .- ......--*`,,--, . ....<:.--.--"* + + it .69-+ + + +J \ • . el :., \\ : - .----- • - , , , , .01 • , , , , , , . . \ ,„ ..• .----- --I + + + + , + + + ; • .......;.„:,,,... ...... - 8 Z • 's 1 E ,4” + r + + + + + + + ; 0 *L. ‘ % ........'•.. ..•••'. + + + + + + + + • + ' \ I . \ a .•••" .••-...' 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'''• «./8•7004 Lae,sLITZ MN Pony^ea 0,84 V , I + + , + + . .... ._.. - ._ ........— ,_ . ---_—.4r,:t....._—_1r...rm.-•-•-••••••-,!7,,,,—.4.,,,,AA;.. .A.,.....4....-n.e.,::/........,. Ni oas■84-88 nx.[109,xmos-asae I •! .. ,'2‘ 4 2 .jj! + ... . mil .:_...., !:. ,.....4. . .! •.. Lt ., , ••••• 1 (.77-4., + , . . •, i•• . i . T.?, 07..R.. ...f, • •-• • I ,.. ,, 1 i ,,......, , /.. t '••• \ 1 le•L'•• ......T. . t... , ., , „ .i,,; AREA I \ : .• v.,■,\ . ._•7.4:..01c...,e4;*s=.11.'''...7 '2•''',-,,.-.':•"'..j' L , CALCULATIONS .,......4.,, 41. L-T, i.,,,i 6.4.:■ . i,,1/4 ' • - k ' i' \*.`;.'1 deiniN ..........._ - NEWLY CREATED IMPERVIOUS 3.735 SF BUS LANE) i.000331 s,SF RSIG0F0(W)AUE) 173 SF ROOF) - 1.• I..../..1 I AREA ;• . i ,,*7 •-t",.. '1 :„.,:% \ ' + ff PARKING) „. TOTAL BASIN MAP \ .,.7 .;V\0., '.. ALTERNATIVE BID ITEIIS •l'1!; Sr i''."411:12; /- V . i.▪ .... ,...:, TOTAL 12:909 sr phase I Design Development twivi , k . dela I October 31,2003 ,...--"-- ••.* k it t I CREATED PERVIOUS;REA 322 SF LANOSCAPE ISLAND) 784 SF LANDSCAPE!SLAT()) an . s I '\ ' f.':1 1.\•••'.i: TOTAL 11,003 SF . A • ,A TREATED IMPERVIOUS AREA 4,877 SF (UPPER MIL() \*,‘ \ ,'•'.; 1....-..:.7. ........, '..''F'. S....J. 1,728 SF (LOSER DRIVE) T.;;,...F..!".f..2.4.3 =:.4-i-7•::::::\L-iveTi...• . 1,213 SF (ADDITIVE ENO PARKING) +5 378 SF (PARKING) V ''\.L\.•••;./. : '; i TOTAL 11.1943 sr ..,,. \'..,, 11- i ; ::••— NET Ulf FERENCE 51 TREATED (+)1,393 SF IMPERVIOUS ! J• I !tt ,•,.. Ascii 103020 r ' ;r, .0 .r: i I:-' ..;.... . r•..' if -Lrehr-ir., ' \\•• .• •i • : s T m.1 ..- \ \ ,, Li/ :: ....- urs ,- , ___ _. PRE-APPLICATION .r h CONFERENCE REQUEST CITY OF TIGARD 13125 SW Hall Blvd., Tigard, OR 97223(503) 639-4171 FAX: (503) 684-7297 GENERAL INFORMATION Applicant: Tc9t') TOtst-si J SL+bNL P(StKtGT FOR STAFF USE ONLY Address: 6`Ib0 Sw S-A1491'501(L' S'r. Phone: 431,-Apo Case No.: PPi E �o03 - aoos e7 City: T& \7 Zip: 1 7 7Z3 Receipt No.: a 003 - a/.5 7 /Contact Person: `mac ObNrN501J Phone: 2Zb-40550 Application Accepted By: C e.� `4 OuLL OLSON/ WLOKA 'f; X> i t' ttlI NILA9, Date: 7 - / - v 3 Property Owner/Deed Holder(s): 6NO. as AIVI.1C,l4.S� DATE OF PRE APP.: 7-/c, 0 3 TIME OF PRE-APP.: /o: oo Address: Phone: PRE-APP. HELD WITH: City: Zip: Rev.7/1/2002 is\curpin\masters\revised\Pre-AppRequest.doc Property Address/Location(s): -11wP LvcY CI\O G 4 AL 14(Q50 St. ' c-I' A\ff, REQUIRED SUBMITTAL ELEMENTS -j-1& m (Note: applications will not be accepted without the required submittal elements) Tax Map &Tax Lot#(s): t t AG Zoning:_ g.'4-. 0. Pre-Application Conf. Request Form Site Size: I 6.56 Ac -S 2 COPIES EACH OF THE FOLLOWING: ©' Brief Description of the Proposal and PRE-APPLICATION any site-specific questions/issues that RE-APPLICATION CONFERENCE INFORMATION you would like to have staff research prior to the meeting. All of the information identified on this form are required to be submitted by the applicant and received by the Planning Division a d Site Plan. The site plan must show the minimum of one (1) week prior to officially scheduling a proposed lots and/or building layouts pre-application conference date/time to allow staff ample time to drawn to scale. Also, show the location prepare for the meeting. of the subject property in relation to the nearest streets; and the locations of A pre-application conference can usually be scheduled within 1-2 driveways on the subject property and weeks of the Planning Division's receipt of the request for either across the street. Tuesday or Thursday mornings. Pre-application conferences are ❑ The Proposed Uses. one (1) hour long and are typically held between the hours of 9:00-11:00 AM. ❑ Topographic Information. Include C ntour Lines if Possible. PRE-APPLICATION CONFERENCES MUST BE SCHEDULED IN If the Pre-Application Conference is for a PERSON AT THE COMMUNITY DEVELOPMENT COUNTER FROM MONOPOLE project, the applicant must 8:00-4:00/MONDAY-FRIDAY. attach a copy of the letter and proof in the form of an affidavit of mailing, that IF MORE THAN 4 PEOPLE ARE EXPECTED TO ATTEND THE the collocation protocol was completed PRE-APPLICATION CONFERENCE IN YOUR GROUP, PLEASE (see Section 18.798.080 of the Tigard INFORM THE CITY IN ADVANCE SO THAT ALTERNATE ROOM Community Development Code). ARRANGEMENTS CAN BE MADE TO ACCOMMODATE THE © Filing Fee $?A9II6 GROUP. n- kg, Ao.rilq SAT. 5 ---T iteevhc CITY OF TIGARD 7/1/2003 13125 SW Hall Blvd. 3:29:58PM �r.A, Tigard,Oregon 97223 s :- 4 'I i. (503) 639-4 17 1 Receipt #: 27200300000000002817 Date: 07/01/2003 Line Items: Case No Tran Code Description Revenue Account No Amount Paid PRE2003-00059 [LANDUS]PreApp Conf 100-0000-438000 205.00 Line Item Total: $205.00 Payments: Method Payer User ID Acct/Check Approval No. How Received Amount- 'i TRUST TIGARD-TUALATIN SCHOOL TTSD23J In Person 205.00 Payment Total: $205.00 Page 1 of 1 cReceipt.rpt D,U L L O L S O N W E E I C E S • -HITECTURE + INTERIORS + PLANNING architects pc DATE: June 30, 2003 TO: Brad Kilby,Associate Planner City of Tigard FROM: Keith Johnson COPY: Nick Harris Cornerstone PROJECT: Twality Middle School Addition and Remodel RE: Pre-Application Conference This memo is to provide an overview of the scope of this project and to list design-related issues we know of at the present time which we would like to have city staff research in advance of the conference. Project Overview This project is one of a number of addition and remodel projects which are funded through a bond approved by residents in the Tigard-Tualatin School District. It includes the following components: • Construction of a multi-use student commons space which will be an addition to the existing building near the southwest corner. The commons will function as a cafeteria,informal performance space,and as a community gathering/meeting space. It is proposed to be approximately 4,600 square feet in area. It is being designed with two-hour area separation walls relative to the existing building. The building sprinkler system will be extended to the new spaces. • Major remodeling of the existing school kitchen to support the new cafeteria space including new cooking and serving lines, refrigerated and dry storage spaces, and ventilation work including a new Type I cooking hood. • Minor remodel to the school offices area where the new addition impacts existing space. • Associated mechanical, electrical,and plumbing work to support the project. • Site work improvements will include an on-site revision to the bus queue area near the 1()//" commons addition,a new parking lot located at the northwest corner of the site,and a free- standing covered area (roof canopy) near the new commons for students waiting for the busses. Specific Issues for City of Tigard Staff to Research • The proposed site plan does not modify the existing curb cuts from SW 97th Street. Will the city require modifications to these? Is the scope of this project such that it would trigger any other public improvements along 97th? • We would like to discuss stormwater management requirements. • Given the description of the work and the drawings submitted, are there any obvious fire/life safety issues we should be aware of? • Are there any planning/zoning issues given the scope of this project? No change of use is being proposed by this application. MEMORANDUM 319 SW WASHINGTON ST, #200 PORTLAND, OR 97204 1: 503 226 6950 j: 503 273 9192 ww,r.down.eom \\F■e2ktprplects1Q30,2Q Twaliry MS-2074\1-Pro;ect FdetWord Processing`14 Development Review\CoT 063003 PreApp Summery hoc PRE-AP (CATION CONFERENCE ILES ENGINEERING SECTION < (cittyolTigard`Oregontt ShapingA Better Community PUBLIC FACILITIES Tax Mauls): 2S111AC Tax Lot[sl: 2700 Use Type: INSTITUTIONAL The extent of necessary public improvements and dedications which shall be required of the applica will be recommended by City staff and subject to approval by the appropriate authority. There will no final recommendation to the decision making authority on behalf of the City staff until all concern commenting agencies, City staff and the public have had an opportunity to review and comment the application. The following comments are a projection of public improvement related requiremen that may be required as a condition of development approval for your proposed project. Right-of-way dedication: The City of Tigard requires that land area be dedicated to the public: (1.) To increase abutting public rights-of-way to the ultimate functional street classification right-of-way width as specified by the Community Development Code; or (2.) For the creation of new streets. Approval of a development application for this site will require right-of-way dedication for: ® SW 97th Avenue to 29 feet from centerline H SW to feet SW to feet SW to feet Street improvements: V Half street improvements will be necessary along SW 97th Avenue, to include: ® 18 feet of pavement from centerline ® concrete curb ® storm sewers and other underground utilities ® 5-foot concrete sidewalk ® street trees ® street signs, traffic control devices, streetlights and a two-year streetlight fee. ® Other: New driveway approaches will be required. The applicant can use City of Tiqa Detail 141 (Standard Driveway) or Detail 162 (Alternate Commercial Driveway). CITY OF TIGARD Pre-Application Conference Notes Page 1 Engineering Department Section ❑ street improvements will be necessary along SW , to include: [ feet of pavement concrete curb storm sewers and other underground utilities -foot concrete sidewalk I I street trees [ I street signs, traffic control devices, streetlights and a two-year streetlight fee. I I Other: street improvements will be necessary along SW , to include: I feet of pavement concrete curb I I storm sewers and other underground utilities -foot concrete sidewalk I I street trees street signs, traffic control devices, streetlights and a two-year streetlight fee. I I Other: street improvements will be necessary along SW , to include: feet of pavement [ I concrete curb storm sewers and other underground utilities -foot concrete sidewalk I street trees I street signs, traffic control devices, streetlights and a two-year streetlight fee. I I Other: [ I street improvements will be necessary along SW , to include: feet of pavement concrete curb storm sewers and other underground utilities -foot concrete sidewalk street trees I street signs, traffic control devices, streetlights and a two-year streetlight fee. CITY OF TIGARD Pre-Application Conference Notes Page 2 Engineering Department Section • (l Other: Agreement for Future Street Improvements: In some cases, where street improvements or other necessary public improvements are not curren practical, the improvements may be deferred. In such cases, a condition of development approv may be specified which requires the property owner(s) to provide a future improvement guarante The City Engineer will determine the form of this guarantee. The following street improvements m be eligible for such a future improvement guarantee: (1.) (2.) Overhead Utility Lines: Z Section 18.810.120 of the Tigard Municipal Code (TMC) requires all overhead utility lin adjacent to a development to be placed underground or, at the election of the developer, fee in-lieu of undergrounding can be paid. This requirement is valid even if the utility lin are on the opposite side of the street from the site. If the fee in-lieu is proposed, it is equal $ 27.50 per lineal foot of street frontage that contains the overhead lines. There are existing overhead utility lines which run adjacent to this site along SW 97th Avenu Prior to final occupancy, the applicant shall either place these utilities underground, or p the fee in-lieu described above. Sanitary Sewers: • The nearest sanitary sewer line to this property is a(n) 8 inch line which is located along the sou property line. The proposed development must be connected to a public sanitary sewer. It is t developer's responsibility to connect to the public sewer Water Supply: The City of Tigard (Phone:(503) 639-4171) provides public water service in the area of this site. Th service provider should be contacted for information regarding water supply for your propos development. Fire Protection: Tualatin Valley Fire and Rescue District (South Division) [Contact: Eric McMullen, (503) 612-701 provides fire protection services within the City of Tigard. The District should be contacted information regarding the adequacy of circulation systems, the need for fire hydrants, or oth questions related to fire protection. Storm Sewer Improvements: All proposed development within the City shall be designed such that storm water runoff is convey to an approved public drainage system. The applicant will be required to submit a proposed sto CITY OF TIGARD Pre-Application Conference Notes Page 3 Engineering Department Section drainage plan for the site, and may be required to prepare a sub basin drainage analysis to ensu that the proposed system wi ;commodate runoff from upstream. Jperties when fully developed. There is storm sewer located in 97th Avenue Onsite detention is required if the new impervious ar exceeds 5000 sf.. Storm Water Quality: The City has agreed to enforce Surface Water Management (SWM) regulations established by t Unified Sewerage Agency (USA) (Resolution and Order No. 00-7) which requires the construction on-site water quality facilities. The facilities shall be designed to remove 65 percent of the phosphor contained in 100 percent of the storm water runoff generated from newly created impervious surface The resolution contains a provision that would allow an applicant to pay a fee in-lieu of constructi an on-site facility provided specific criteria are met. The City will use discretion in determining wheth or not the fee in-lieu will be offered. If the fee is allowed, it will be based upon the amount of ne impervious surfaces created; for every 2,640 square feet, or portion thereof, the fee shall be $21 Preliminary sizing calculations for any proposed water quality facility shall be submitted with t development application. It is anticipated that this project will require: 1< Construction of an on-site water quality facility. Payment of the fee in-lieu. Other Comments: All proposed sanitary sewer and storm drainage systems shall be designed such that C maintenance vehicles will have unobstructed access to critical manholes in the systems. Maintenan access roadways may be required if existing or proposed facilities are not otherwise read accessible. TRAFFIC IMPACT FEES In 1990, Washington County adopted a county-wide Traffic Impact Fee (TIF) ordinance. The Traf Impact Fee program collects fees from new development based on the development's project impact upon the City's transportation system. The applicant shall be required to pay a fee based up the number of trips which are projected to result from the proposed development. The calculation the TIF is based on the proposed use of the land, the size of the project, and a general use based f category. The TIF shall be calculated at the time of building permit issuance. In limit circumstances, payment of the TIF may be allowed to be deferred until the issuance of an occupan permit. Deferral of the payment until occupancy is permissible only when the TIF is greater th $5,000.00. Pay the TIF. CITY OF TIGARD Pre-Application Conference Notes Page 4 Engineering Department Section PERMITS Public Facility Improvement (PFI) Permit: Any work within a public right-of-way in the City of Tigard requires a PFI permit from the Engineeri Department. A PFI permit application is available at the Planning/Engineering counter in City Ha For more extensive work such as street widening improvements, main utility line extensions subdivision infrastructure, plans prepared by a registered professional engineer must be submitted review and approval. The Engineering Department fee structure for this permit is considered a cost recovery system. deposit is collected with the application, and the City will track its costs throughout the life of t permit, and will either refund any remaining portion of the deposit, or invoice the Permittee in cas where City costs exceeds the deposit amount. The Permittee will also be required to post performance bond, or other such suitable security. Where professional engineered plans a required, the Permittee must execute a Developer/Engineer Agreement, which will obligate the desi engineer to perform the primary inspection of the public improvement construction work. The P permit fee structure is as follows: NOTE: If an PFI Permit is required,the applicant must obtain that permit prior to release of any permits from the Building Division. Building Division Permits: The following is a brief overview of the type of permits issued by the Building Division. For a mo detailed explanation of these permits, please contact the Development Services Counter 503-639-4171, ext. 304. Site Improvement Permit (SIT). This permit is generally issued for all new commerci industrial and multi-family projects. This permit will also be required for land partitions where grading and private utility work is required. This permit covers all on-site preparation, gradi and utility work. Home builders will also be required to obtain a SIT permit for grading work cases where the lot they are working on has slopes in excess of 20% and foundati excavation material is not to be hauled from the site. Building Permit (BUP). This permit covers only the construction of the building and is issu after, or concurrently with, the SIT permit. Master Permit (MST). This permit is issued for all single and multi-family buildings. It covers work necessary for building construction, including sub-trades (excludes grading, etc.). Th permit can not be issued in a subdivision until the public improvements are substantia complete and a mylar copy of the recorded plat has been returned by the applicant to the Ci For a land partition, the applicant must obtain an Engineering Permit, if required, and return mylar copy of the recorded plat to the City prior to issuance of this permit. Other Permits. There are other special permits, such as mechanical, electrical and plumbi that may also be required. Contact the Development Services Counter for more information. CITY OF TIGARD Pre-Application Conference Notes Page 5 Engineering Department Section GRADING PLAN REQUIREMENTS FOI BDIVISIONS All subdivision projects shall require a proposed grading plan prepared by the design engineer. T engineer will also be required to indicate which lots have natural slopes between 10% and 20%, well as lots that have natural slopes in excess of 20%. This information will be necessary determining if special grading inspections will be required when the lots develop. The design engine will also be required to shade all structural fill areas on the construction plans. In addition, ea homebuilder will be required to submit a specific site and floor plan for each lot. The site plan sh include topographical contours and indicate the elevations of the corners of the lot. The builder sh also indicate the proposed elevations at the four corners of the building. PREPARED BY: {ryv■ rrL�✓Vl '7 • 1O. 03 ENGI EKING DEPARTMENT STAFF DATE Phone: (5031 639-4171 Fax: (5031 624-0752 is\eng\brianr\templates\preap notes-eng.dot Revised: March 21,2002 CITY OF TIGARD Pre-Application Conference Notes Page 6 Engineering Oepanment Section t TY OF TIGARD PRE-APPLICATION CONFERENCE NOTES c�mmu�i,n,tyngnjim'nt Airing A(BetterCommunzty (Pre-Application Meeting Notes are Valid for Six (6) Months) NON-RESIDENTIAL C-UP ( 0003 m ..:.m��. - = _ ORIGINAL Sp2 11 ORIGINAL APPLICANT: 1 & i i 7Da\n-VAI c1.00\ Z;%s� AGENT: FZK �nl.asa>J Phone: ( ) Phone: (303 Dab-t;9 SO PROPERTY LOCATION: ADDRESS/GENERAL LOCATION: t'- (-' o so 5'r ' A u E TAX MAP(S)/LOT #(S): :1S t ►C-4 ar100 NECESSARY APPLICATIONS: 4f(1,00 Sc 0AA'A■ONI -CLbaY,Ar ;of t€ d'C\■001, enf\t mcip;a s cvtrin c: cat ion c i er.a\ v se. -PQe^.w+y PROPOSAL DESCRIPTION: LII DIY c rnm(A M.\ Qr'eQ QaLA■it;n n COMPREHENSIVE PLAN MAP DESIGNATION: L,o1•u Dens'cr r, Q` _ ZONING MAP DESIGNATION: P� •S CITIZEN INVOLVEMENT TEAM (C.I.T.)AREA: T,_3-c H ZONING DISTRICT DIMENSIONAL REQUIREMENTS Meter to Code Section 18. 330 l MINIMUM LOT SIZE:9 S.Cesq. ft. Average Min. lot width: SO ft. Max. building height: "'b ft. Setbacks: Front 3r) ft. Side 'O ft. Rear ?(---) ft. Corner ft. from street. MAXIMUM SITE COVERAGE: -, % Minimum landscaped or natural vegetation area: - %. [ I NEIGHBORHOOD MEETING Meter to the Neighborhood Meeting Handout] THE APPLICANT SHALL NOTIFY ALL PROPERTY OWNERS WITHIN 500 FEET, THE MEMBERS OF ANY LAND USE SUBCOMMITTEE(S), AND THE CITY OF TIGARD PLANNING DIVISION of their proposal. A minimum of two (2) weeks between the mailing date and the meeting date is required. Please review the Land Use Notification handout concerning site posting and the meeting notice. Meeting is to be held prior to submitting your application or the application will not be accepted. * NOTE: In order to also preliminarily address building code standards, a meeting with a Plans Examiner is encouraged prior to submittal of a land use application. CITY OF TIGARD Pre-Application Conference Notes Page 1 of 8 NON Residential Application/Planning Division Section Li NARRATIVE (Refer to Code Chu,._.:r 18.390) The APPLICANT SHALL SUBMIT A NARRATIVE which provides findings based on the applicable approval standards. Failure to provide a narrative or adequately address criteria would be reason to consider an application incomplete and delay review of the proposal. The applicant should review the code for applicable criteria. .1 IMPACT STUDY (Refer to Code Sections 18290.040 and 18.390.0501 As a part of the APPLICATION SUBMITTAL REQUIREMENTS, applicants are required to INCLUDE IMPACT STUDY with their submittal package. The impact study shall quantify the effect of the development on public facilities and services. The study shall address, at a minimum, the transportation system, including bikeways, the drainage system, the parks system, the water system, the sewer system and the noise impacts of the development. For each public facility system and type of impact, the study shall propose improvements necessary to meet City standards, and to minimize the impact of the development on the public at large, public facilities systems, and affected private property users. In situations where the Community Development Code requires the dedication of real property interests, the applicant shall either specifically concur with the dedication requirement, or provide evidence which supports the conclusion that the real property dedication requirement is not roughly proportional to the projected impacts of the development. Li ACCESS (Refer to Chapters 18.705 and 18.1651 Minimum number of accesses: Minimum access width: Minimum pavement width: All driveways and parking areas, except for some fleet storage parking areas, must be paved. Drive-in use queuing areas: WALKWAY REQUIREMENTS (Refer to Code Section 18.705.0301 WALKWAYS SHALL EXTEND FROM THE GROUND FLOOR ENTRANCES OR FROM THE GROUND FLOOR LANDING OF STAIRS, ramps, or elevators of all commercial, institutional, and industrial uses, to the streets which provide the required access and egress. Walkways shall provide convenient connections between buildings in multi-building commercial, institutional, and industrial complexes. Unless impractical, walkways should be constructed between a new development and neighboring developments. I I SPECIAL SETBACKS (Refer to Code Chapter 1;.730) • STREETS: feet fro the centerline of :- LOWER INTENSITY ZONES: feet, along the site's boundary. ➢ FLAG LOT: 10-FOOT SIDE ARD SETBACK. ❑ SPECIAL BUILDING HEIGHT PROVISIO S (Refer to Code Section 18.730.010.B.) BUILDING HEIGHT EXCEPTIONS - Buil 'rigs located in a non-residential zone may be built to a height of 75 feet provided that: ➢ A maximum building floor area to Ite area ratio (FAR) of 1.5 to 1 will exist; ➢ All actual building setbacks will e at least half (%) of the building's height; and ➢ The structure will not abut a rOidential zoned district. BUFFERING AND SCREENING (Refer to Code Chapter 18.145) In order TO INCREASE PRIVACY AND TO EITHER REDUCE OR ELIMINATE ADVERSE NOISE OR VISUAL IMPACTS between adjacent developments, especially between different land uses, the City requires landscaped buffer areas along certain site perimeters. Required buffer areas are described by the Code in terms of width. Buffer areas must be occupied by a mixture of deciduous and evergreen trees and shrubs and must also achieve a balance between vertical and horizontal plantings. Site obscuring screens or fences may also be required; these are often advisable even if not required by the Code. The required buffer areas may only be occupied by vegetation, fences, utilities, and walkways. Additional information on required buffer area materials and sizes may be found in the Development Code. CITY OF TIGARD Pre-Application Conference Notes Page 2 of 8 NON-Residential Application/Planning Division Section The ESTIMATED REQUIRCv BUFFER WIDTHS applicable to your proposal area are: feet along north boundary. feet along east boundary. -- feet along south boundary. feet along west boundary. IN ADDITION, SIGHT OBSCURING SCREENING IS REQUIRED ALONG: TAN-e,;d. . ■ LANDSCAPING (Refer to Code Chapters 18.145,18.765 and 18.7051 --> STREET TREES ARE REQUIRED FOR ALL DEVELOPMENTS FRONTING ON A PUBLIC OR PRIVATE STREET as well as driveways which are more than 100 feet in length. Street trees must be placed either within the public right-of-way or on private property within six (6) feet of the right-of- way boundary. Street trees must have a minimum caliper of at least two (2) inches when measured four (4) feet above grade. Street trees should be spaced 20 to 40 feet apart depending on the branching width of the proposed tree species at maturity. Further information on regulations affecting street trees may be obtained from the Planning Division. A MINIMUM OF ONE (1) TREE FOR EVERY SEVEN (7) PARKING SPACES MUST BE PLANTED in and around all parking areas in order to provide a vegetative canopy effect. Landscaped parking areas shall include special design features which effectively screen the parking lot areas from view. These design features may include the use of landscaped berms, decorative walls, and raised planters. El RECYCLING (Refer to Code Chapter 18.755) Applicant should CONTACT FRANCHISE HAULER FOR REVIEW AND APPROVAL OF SITE SERVICING COMPATIBILITY. Locating a trash/recycling enclosure within a clear vision area such as at the intersection of two (2) driveways within a parking lot is prohibited. Much of Tigard is within Pride Disposal's Service area. Lenny Hing is the contact person and can be reached at (503) 625-6177. PARKING (Refer to Code Section 18365.0401 REQUIRED parking for this type of use: K.c2 C\ ass 1240m Parking SHOWN on preliminary plan(s): SECONDARY USE REQUIRED parking: Parking SHOWN on preliminary plan(s): • NO MORE THAN 50% OF REQUIRED SPACES MAY BE DESIGNATED AND/OR DIMENSIONED AS COMPACT SPACES. PARKING STALLS shall be dimensioned as follows: ➢ Standard parking space dimensions: 8 feet, 6 inches x 18 feet, 6 inches. Compact parking space dimensions: 7 feet, 6 inches x 16 feet, 6 inches. Note: Parking space width includes the width of a stripe that separates the parking space from an adjoining space. Note: A maximum of three (3) feet of the vehicle overhang area in front of a wheel stop or curb can be included as part of required parking space depth. This area cannot be included as landscaping for meeting the minimum percentage requirements. HANDICAPPED PARKING: r All parking areas shall PROVIDE APPROPRIATELY LOCATED AND DIMENSIONED DISABLED PERSON PARKING spaces. The minimum number of disabled person parking spaces to be provided, as well as the parking stall dimensions, are mandated by the Americans with Disabilities Act (ADA). A handout is available upon request. A handicapped parking space symbol shall be painted on the parking space surface and an appropriate sign shall be posted. r BICYCLE RACKS ARE REQUIRED FOR MULTI-FAMILY, COMMERCIAL AND INDUSTRIAL DEVELOPMENTS. Bicycle racks shall be located in areas protected from automobile traffic and in convenient locations. 10 LOADING AREA REQUIREMENTS Meter to Code Section 18365.0801 Every COMMERCIAL OR INDUSTRIAL BUILDING IN EXCESS OF 10,000 SQUARE FEET shall be provided with a loading space. The space size and location shall be as approved by the City Engineer. CITY OF TIGARD Pre-Application Conference Notes Page 3 of 8 NON-Residential Appka6on/Planning Division Section I BICYCLE RACKS (Refer to Code_ .:tion 18.7651 (9 Pee' 66s-se-cr. BICYCLE RACKS are required FOR MULTI-FAMILY, COMMERCIAL AND INDUSTRIAL DEVELOPMENTS. Bicycle racks shall be located in areas protected from automobile traffic and in convenient locations. I I SENSITIVE LANDS [Refer to Code Chapter 18.7151 The Code provides REGULATIONS FOR LANDS WHICH ARE POTENTIALLY UNSUITABLE FOR DEVELOPMENT DUE TO AREAS WITHIN THE 100-YEAR FLOODPLAIN, NATURAL DRAINAGEWAYS, WETLAND AREAS, ON SLOPES IN EXCESS OF 25 PERCENT, OR ON UNSTABLE GROUND. Staff will attempt to eliminary identify sensitive lands areas at the pre- application conference based on available inf rmation. HOWEVER, the responsibility to precisely identify sensitive land areas, and their bouyldaries, is the responsibility of the applicant. Areas meeting the definitions of sensitive lands must be clearly indicated on plans submitted with the development application. / Chapter 18.775 also provides regulations/for the use, protection, or modification of sensitive lands areas. RESIDENTIAL DEVELOPMENT yS PROHIBITED WITHIN FLOODPLAINS. n STEEP SLOPES (Refer to Code Section 18.715.080.C1 When STEEP SLOPES exist, prior to issuance of a final order, a geotechnical report must be submitted which addresses the approval standards of the Tigard Community Development Code Section 18.775.080.C. The report,Shall be based upon field exploration and investigation and shall include specific recommendations for achieving the requirements of Section 18.775.080.C. I,,I CLEARWATER SERVICES(CWSI BUFFER STANDARDS (Refer to R&0 96-44/USA Regulations-Chapter 31 LAND DEVELOPMENT ADJACENT TO SENSITIVE AREAS shall preserve and maintain or create a vegetated corridor for a buffer wide enough to protect the water quality functioning of the sensitive area. Desiqn Criteria: The VEGETATED CORRIDOR WIDTH is dependent on the sensitive area. The following table identifies the required widths: TABLE 3.1 VEGETATED CORRIDOR WIDTHS SOURCE: CWS DESIGN AND CONSTRUCTION STANDARDS MANUAL/RESOLUTION & ORDER 96-44 SENSITIVE AREA DEFINITION SLOPE ADJACENT WIDTH OF VEGETATED TO SENSITIVE AREA 4 CORRIDOR PER SIDE5 - • Streams with intermittent flow draining: <25% 1 10 to <50 acres 15 feet 1 >50 to <100 acres 25 feet • Existing or created wetlands <0.5 acre 25 feet • Existing or created wetlands >0.5 acre <25% 50 feet • Rivers, streams, and springs with year-round flow • Streams with intermittent flow draining >100 acres • Natural lakes and ponds • Streams with intermittent flow draining: >25% 1 10 to <50 acres 30 feet • >50 to <100 acres 50 feet • Existing or created wetlands >25% Variable from 50-200 feet. Measure • Rivers, streams, and springs with year-round flow in 25-foot increments from the starting • Streams with intermittent flow draining >100 acres point to the top of ravine (break in • Natural lakes and ponds <25%slope), add 35 feet past the top of ravine6 4Starting point for measurement = edge of the defined channel (bankful flow) for streams/rivers, delineated wetland boundary, delineated spring boundary,and/or average high water for lakes or ponds,whichever offers greatest resource protection. Intermittent springs, located a minimum of 15 feet within the river/stream or wetland vegetated corridor,shall not serve as a starting point for measurement. 6Vegetated corridor averaging or reduction is allowed only when the vegetated corridor is certified to be in a marginal or degraded condition. 6The vegetated corridor extends 35 feet from the top of the ravine and sets the outer boundary of the vegetated corridor. The 35 feet may be reduced to 15 feet,if a stamped geotechnical report confirms slope stability shall be maintained with the reduced setback from the top of ravine. CITY OF TIGARD Pre-Application Conference Notes Page 4 of 8 NON Residential Application/Planning Division Section Restrictions in the Vegetat\ Jrridor: NO structures, development, construction activities, gardens, lawns, application of chemicals, dumping of any materials of any kind, or other activities shall be permitted which otherwise detract from the water quality protection provided by the vegetated corridor, except as provided for in the CWS Design and Construction Standards. Location of Vegetated Corridor: IN ANY RESI15ENTIAL DEVELOPMENT WHICH CREATES MULTIPLE PARCELS or lots intended for separate ownership, such as a subdivision, the vegetated corridor shall be contained in a separate tract, and shall not be a part of any parcel to be used for the construction of a dwelling unit. CWS Service Provider Letter: PRIOR TO SUBMITTAL of any land use applications, the applicant must obtain a CWS Service Provider Letter which will outline the conditions necessary to comply with the R&O 96-44 sensitive area requirements. If there are no sensitive areas, CWS must still issue a letter stating a CWS Service Provider Letter is not required. ] SIGNS (Refer to Code Chapter 18.7801 SIGN PERMITS MUST BE OBTAINED PRIOR TO INSTALLATION OF ANY SIGN in the City of Tigard. A "Guidelines for Sign Permits" handout is available upon request. Additional sign area or height beyond Code standards may be permitted if the sign proposal is reviewed as part of a development review application. Alternatively, a Sign Code Exception application may be filed for Director's review. [7 TREE REMOVAL PLAN REQUIREMENTS (Refer to Code Section 18.790.030.CJ A TREE PLAN FOR THE PLANTING, REMOVAL AND PROTECTION OF TREES prepared by a certified arborist shall be provided for any lot, parcel or combination of lots or parcels for which a development application for a subdivision, partition, site development review, planned development, or conditional use is filed. Protection is preferred over removal where possible. THE TREE PLAN SHALL INCLUDE the following: ➢ Identification of the location, size and species of all existing trees including trees designated as significant by the City; ➢ Identification of a program to save existing trees or mitigate tree removal over 12 inches in caliper. Mitigation must follow the replacement guidelines of Section 18.790.060.D according to the following standards and shall be exclusive of trees required by other development code provisions for landscaping, streets and parking lots: Retainage of less than 25% of existing trees over 12 inches in caliper requires a mitigation program according to Section 18.150.070.D. of no net loss of trees; Retainage of from 25 to 50% of existing trees over 12 inches in caliper requires that two- thirds of the trees to be removed be mitigated according to Section 18.790.060.D.; Retainage of from 50 to 75% of existing trees over 12 inches in caliper requires that 50% of the trees to be removed be mitigated according to Section 18.790.060.D.; Retainage of 75% or greater of existing trees over 12 inches in caliper requires no mitigation; ➢ Identification of all trees which are proposed to be removed; and ➢ A protection program defining standards and methods that will be used by the applicant to protect trees during and after construction. TREES REMOVED WITHIN THE PERIOD OF ONE (1) YEAR PRIOR TO A DEVELOPMENT APPLICATION LISTED ABOVE will be inventoried as part of the tree plan above and will be replaced according to Section 18.790.060.D. ] ] MITIGATION (Refer to Code Section 18.190.060.EJ REPLACEMENT OF A TREE shall take place according to the following guidelines: • A replacement tree shall be a substantially similar species considering site characteristics. ➢ If a replacement tree of the species of the tree removed or damaged is not reasonably available, the Director may allow replacement with a different species of equivalent natural resource value. CITY OF TIGARD Pre-Application Conference Notes Page 5 of 8 NON-Residential Application/Planning Division Section If a replacement trek. 1 the size cut is not reasonably avati..uIe on the local market or would not be viable, the Director shall require replacement with more than one tree in accordance with the following formula: + The number of replacement trees required shall be determined by dividing the estimated caliper size of the tree removed or damaged, by the caliper size of the largest reasonably available replacement trees. If this number of trees cannot be viably located on the subject property, the Director may require one (1) or more replacement trees to be planted on other property within the city, either public property or, with the consent of the owner, private property. ➢ The planting of a replacement tree shall take place in a manner reasonably calculated to allow growth to maturity. IN LIEU OF TREE REPLACEMENT under Subsection D of this section, a party may, with the consent of the Director, elect to compensate the City for its costs in performing such tree replacement. Qe CLEAR VISION AREA (Refer to Code Chapter 18.795) The City requires that CLEAR VISION AREAS BE MAINTAINED BETWEEN THREE (3) AND EIGHT (8) FEET IN HEIGHT at road/driveway, road/railroad, and road/road intersections. The size of the required clear vision area depends upon the abutting street's functional classification and any existing obstructions within the clear vision area. (1 ADDITIONAL LOT DIMENSIONAL REQUIREMENTS (Refer to Code Section 18.810.0601 MINIMUM LOT FRONTAGE: 25 f t unless lot is created through the minor land partition process. Lots created as part of a partition ust have a minimum of 15 feet of frontage or have a minimum 15-foot wide access easement. The DEPTH OF ALL LOTS ALL NOT EXCEED 21/2 TIMES THE AVERAGE WIDTH, unless the parcel is less than 11/2 times e minimum lot size of the applicable zoning district. CODECHAPTERS /18.330(Conditional Use) 18.620(Tigard Triangle Design Standards) 18.765(Off-Street Parking/Loading Requirements) 18.340(Directors Interpretation) 18.630(Washington Square Regional Center) 18.775(Sensitive Lands Review) 18.350(Planned Development) 18.705(Amess/Egress/Cirtulation) 18.780(signs) 18.360(Site Development Review) 18.710(Accessory Residential Units) _ 18.785(Temporary Use Permits) 18.370(Variances/Adjustments) 18.715(Density Computations) 18.790(Tree Removal) - 18.380(Zoning Map/Text Amendments) 18.720(Design Compatibility Standards) 18.795(Visual Clearance Areas) 18.385(Miscellaneous Permits) 18.725(Environmental Performance Standards) _ 18.798(Wireless Communication Facilities) 18.390(Decision Making Procedures/Impact Study) 18.730(Exceptions To Development Standards) 18.810(Street&Utility Improvement Standards) 18.410(Lot Line Adjustments) 18.740(Historic Overlay) 18.420(Land Partitions) 18.742(Home Occupation Permits) 18.430(Subdivisions) 18.745(Landscaping&Screening Standards) 18.510(Residential Zoning Districts) 18.750(Manufactured/Mobil Horne Regulations) - 18.520(Commercial Zoning Districts) 18.755(Mixed Solid Waste/Recycling Storage) - 18.530(Industrial Zoning Districts) 18.760(Nonconforming Situations) CITY OF TIGARD Pre-Application Conference Notes Page 6 of 8 NON-Residential Application/Planning Division Section ADDITIONAL CONCERNS OR COMMEN1a. r11ay be a t rtexr t ;.i ► ►o t.1 - tC) �0 t - 1{e5 LNG 6.c'ac-E 6Lerlsidr, (WY, CBS;Or has 12rEe,c\ U m_ED can irke Qcs NE.:■sizlaockcsaA Me..eV, C crk i c e i Mef` taarpa-ri1l.1 CUM ess►nc gat)'16W tar ri,c e+s Ids(Nk; eA on ' y (P tmfv.e� PROCEDURE Administrative Staff Review. Public hearing before the Land Use Hearings Officer. Public hearing before the Planning Commission. Public hearing before the Planning Commission with the Commission making a recommendation on the proposal to the City Council. An additional public hearing shall be held by the City Council. APPLICATION SUBMITTAL PROCESS All APPLICATIONS MUST BE ACCEPTED BY A PLANNING DIVISION STAFF MEMBER of the Community Development Department at Tigard City Hall offices. PLEASE NOTE: Applications submitted by mail or dropped off at the counter without Planning Division acceptance may be returned. The Planning counter closes at 4:00 PM. Maps submitted with an application shall be folded IN ADVANCE to 8.5 by 11 inches. One (1), 81/2" x 11" map of a proposed project should be submitted for attachment to the staff report or administrative decision. Application with unfolded maps shall not be accepted. The Planning Division and Engineering Department will perform a preliminary review of the application and will determine whether an application is complete within 30 days of the counter submittal. Staff will notify the applicant if additional information or additional copies of the submitted materials are required. CITY OF TIGARD Pre-Application Conference Notes Page 7 of 8 NON-Residential Applicatm/Planning Division Section The administrative decisiot. . public hearing will typically occur at,, .aximately 45 to 60 days after an application is accepted as being complete by the Planning Division. Applications involving difficult or protracted issues or requiring review by other jurisdictions may take additional time to review. Written recommendations from the Planning staff are issued seven (7) days prior to the public hearing. A 10-day public appeal period follows all land use decisions. An appeal on this matter would be heard by the Tigard Cl, Co,anc• L . A basic flow chart which illustrates the review process is available from the Planning Division upon request. Land use applications requiring a public hearing must have notice posted on-site by the applicant no less than 10 days prior to the public hearing. This PRE-APPLICATION CONFERENCE AND THE NOTES OF THE CONFERENCE ARE INTENDED TO INFORM the prospective applicant of the primary Community Development Code requirements applicable to the potential development of a particular site and to allow the City staff and prospective applicant to discuss the opportunities and constraints affecting development of the site. BUILDING PERMITS PLANS FOR BUILDING AND OTHER RELATED PERMITS WILL NOT BE ACCEPTED FOR REVIEW UNTIL A LAND USE APPROVAL HAS BEEN ISSUED. Final inspection approvals by the Building Division will not be granted until there is compliance with all conditions of development approval. These pre-application notes do not include comments from the Building Division. For proposed buildings or modifications to existing buildings, it is recommended to contact a Building Division Plans Examiner to determine if there are building code issues that would prevent the structure from being constructed, as proposed. Additionally, with regard to Subdivisions and Minor Land Partitions where any structure to be demolished has system development charge (SDC) credits and the underlying parcel for that structure will be eliminated when the new plat is recorded, the City's policy is to apply those system development credits to the first building permit issued in the development (UNLESS OTHERWISE DIRECTED BY THE DEVELOPER AT THE TIME IN WHICH THE DEMOLITION PERMIT IS OBTAINED). PLEASE NOTE: The conference and notes cannot cover all Code requirements and aspects related to site planning that should apply to the development of your site plan. Failure of the staff to provide information required by the Code shall not constitute a waiver of the applicable standards or requirements. It is recommended that a prospective applicant either obtain and read the Community Development Code or ask any questions of City staffrelative to Code requirements prior to submitting an application. AN ADDITIONAL PRE-APPLICATION FEE AND CONFERENCE WILL BE REQUIRED IF AN APPLICATION PERTAINING TO THIS PRE-APPLICATION CONFERENCE IS SUBMITTED AFTER A PERIOD OF MORE THAN SIX (6) MONTHS FOLLOWING THIS CONFERENCE (unless deemed as unnecessary by the Planning Division). PREPARED BY: \c c s �,\V-1 CITY OF TIGARD PLANNING DIVISION - STAFF PERSON HOLDING PRE-APP. MEETING PHONE: (503) 639-4111 FAX: (503) 684-7291 E-MAIL (staffs first name) ci.tigard.or.us TITLE 18(CITY OF TIGARD'S COMMUNITY DEVELOPMENT CODE)INTERNET ADDRESS: www.ci.tigard.or.us H:lpattylmasters\Pre-App Notes Commercial.doc Updated: 3-Oct-02 (Engineering section:preapp.eng) CITY OF TIGARD Pre-Application Conference Notes Page 8 of 8 NON-Residential Application/Planning Division Section W0" County,Oregon 2005_031025 0305 09:33:52 AM D-E Cnta1 8tns10 KBARNETT $20.00$0.00$11.00-Total a$37.00 �4 After Recording Return Recorded Document to: City Records-City of Tigard 00744519200500310250040043 6 Jerry Hanson,Director of Assessment and Taxation 13125 SW Hall Blvd.-Tigard,OR 97223 and Ex-Officio county Clerk for Washington County, Oregon,do hereby certify that the within Instrument of writing was received and recorded In the book of records of said county. �J� w.stly.Jerry R.Hanson,Directorment and Taxation, CORPORATION Ex-Officio county Clerk Project/File No. Za©;- pip 1'7 EASEMENT PERMANENT WATERLINE hereinafter called the "Grantors", grant, convey, and transfer unto the City of Tigard, a municipal corporation of Washington County, Oregon hereinafter referred to as "Grantee", its successor and assigns forever, a permanent easement over and upon the following described real property,to wit: This easement shall be for the construction, maintenance, and repair of an underground pipeline and/or mains for the purpose of conveying water over, across, through, and under the hereinabove described real property and shall include the perpetual right to enter upon said real property at reasonable times, together with the right to excavate and refill ditches for the location of said pipelines and/or mains, and the further right to remove all obstructions interfering with the location, construction,and maintenance of said pipeline and/or mains. The true consideration for this conveyance is$ 0.00 . However,the actual consideration consists of or includes other property or value given or promised which is the whole consideration. It is expressly understood that this easement does not convey any right,title,or interest except those expressly stated in this easement, nor otherwise prevent Grantors from the full use and dominion thereover; provided, however, that such use shall not interfere with the uses and purposes of the intent of the easement. . 2005-31025 In consideration of the premises, Grantee agrees that if said Grantee, its successors or assigns should cause said easement to be vacated,the rights of the Grantee in the above-described easement will be forfeited and shall immediately revert to the Grantors, their successors and assigns in the case of such event. To have and to hold the above-described and granted premises unto said Grantee, its successors, and assigns forever. IN WITNESS WHEREOF,I hereunto set my hand on this Q day of , 20Q4- Name of Corporation Signature 144 o 514) 0BWd-:: Yr Address Title (f' 1922- 3 Si atur ,_- Title -T ' V STATE OF OREGON ) )ss. County of Washington ) This instrument was acknowledged before me on 7 hal,:Q`7� (date) by _51f4e717 2Q'Q9name(s) of person(s)) as l,''rrcIrrr (type of authority,e.g.,officer,trustee,etc) of c (name ofParh'on behalf of whom instrument was execut4. OFFICIAL SEAL CYNTHIA I HALL Notary' ignature NOTARY PUBLIC—OREGON COMMISSION No.347037 My Commission Expires: MY COMIESSIOM E7fPM SEPTEMBER 18,2005 Accepted on behalf of the City of Tigard this 2 day of J a►^�aY 2065. 1:,P .n0C 2005-31025 1025 EXHIBIT A PROJECT: TWALITY MIDDLE SCHOOL LOCATION: TAX LOT 2700, 2S 1 11AC PROPERTY OWNER: TIGARD-TUALATIN SCHOOL DISTRICT 23J PREPARED BY: Compass Engineering 6564 S.E. Lake Road Milwaukie, Oregon 97222 503-653-9093 WATERLINE EASEMENT: A TRACT OF LAND IN THE NORTHEAST 114 OF SECTION 11, TOWNSHIP 2 SOUTH, RANGE 1 WEST, WILLAMETTE MERIDIAN, CITY OF TIGARD, WASHINGTON COUNTY, OREGON (AND BEING A PORTION OF LOT 38, "TIGARDVILLE HEIGHTS", A PLAT OF RECORD IN WASHINGTON COUNTY, OREGON) BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS: BEGINNING AT THE INTERSECTION OF THE EAST LINE OF COUNTY ROAD NO. 1982 (SAID EAST LINE BEING FURTHER DESCRIBED AS BEING 25.00 FEET EAST OF AND PARALLEL WITH THE CENTERLINE OF COUNTY ROAD NO. 1982 AS DEPICTED ON PLAT OF COUNTY ROAD NO. 1982, FILED AT THE WASHINGTON COUNTY SURVEYOR'S OFFICE) WITH THE NORTH LINE OF LOT 22, "DARMEL PLAT NO. 3", A PLAT OF RECORD IN WASHINGTON COUNTY, OREGON; THENCE ALONG SAID EAST LINE OF COUNTY ROAD NO. 1982 NORTH 01044'00" EAST 35.00 FEET; THENCE LEAVING SAID EAST LINE SOUTH 89°17'18" EAST 15.00 FEET; THENCE SOUTH 01044'00" WEST 20.00 FEET; THENCE SOUTH 89°17'18" EAST 10.00 FEET; THENCE SOUTH 01 044'00"WEST 15.00 FEET TO THE AFOREMENTIONED NORTH LINE OF LOT 22, "DARMEL PLAT NO. 3"; THENCE ALONG SAID NORTH LINE NORTH 89017'18" WEST 25.00 FEET TO THE POINT OF BEGINNING. CONTAINS 675 SQUARE FEET, MORE OR LESS. AOL 2005-31025 FOUND 3/4' IRON PIPE __/IN MONUMENT BOX �1 I I L TAX LOT 2700 N TWALITY MIDDLE SCHOOL ui ISN N NN > _,r, In 25' Cm m 3 �CIS IZ C. m ( S8917'18'E 15.00' PUBLIC WATER FOUND 3/4' IRON PIPE o g _ LINE EASEMENT IN MONUMENT BOX ui675 SQUARE FEET \ N i o a 589'17'18'E FOUND 3/4'IRON PIPE AT NORTHEAST CORNER 10.00' a OF LOT 20, 'DARMEL z / PLAT NO. 3' ai ui N8917'18'W m 25.00' �- 340.42' IPOINT OF I BEGINNING I LOT 22 "DARMEL PLAT NO. 3' 1 N A REGISTERED w E PROFESSIONAL LAN URVEY S OREGON Scale: 1" = 20' JULY 14,1978 DON DEVLAEMINCK 20' 0' 20' 40' 60' 1634 DATE OF SIGNATURE: % D VALID UNTIL 12/31/2005 EXHIBIT COMPASS ENGINEERING TAX LOT 2700(2S-1-11AC) W* ENGINEERING SURVEYING PLANNING SW 1/4 OF THE NE 1/4 SEC.11,T.2S.,R.1 W.,W.M. 959aS.E.UKEROM (503)9519993 PHONE CITY OFTIGARD,WASHINGTON COUNTY,OREGON g MILWAUKIE,OREGON 97222 WWW.COMPASS-ENGINEERING.COM 5303EXH.DWG