Ordinance No. 07-20 CITY OF TIGARD, OREGON
TIGARD CITY COUNCIL
ORDINANCE NO. 07- ,�D
AN ORDINANCE ADOPTING COMPRE IENSIVL PLAN AMENDMENT CPA 2007-00002
TO UPDATE THE GOALS, POLICIES, AND RECOMMENDED ACTION -\VEASURES
PERTAINING TO STATEWIDE PLANNING GOAL 7: NATURAL I LIZARDS
WHEREAS, the Tigard City Council directed staff to complete a full update of the Tigard
Comprehensive Plan, including a process for garnering citizen input; and
WI IER ,,AS, the Tigard visioning reports, cornrnunity surveys, and policy interest tcain meetings were
utilized to develop draft language for the update of the Tigard Comprehensive Plan; and
WHEREAS, the City has proposed an amendment to the Tigard Comprehensive Plan Chapter 3 by
updating Goals, Policies, and Reconnnendcd Action Measures corresponding to Statewide Planning
Goal 7; and
WHEREAS, the Tigard Planning Col-Mission held a public meeting, which was noticed in accordance
with City standards, on September 17, 2007, and recommended approval of the proposed CPA 2007-
00002 by motion and xvidz majority vote; and
WHEREAS, on December 4, 2007, the Tigard City Council held a public hearing, which was
noticed in accordance with City standards, to consider the Commission's recommendation on CPA
2007-00002, and at this meeting the Tigard City Council adopted CPA 2007-00002 by motion, as
amended pursuant to the public hearing and its deliberations; and
WHERE AS, Council's decision to adopt CPA 2007-00002 is based on the findings and conclusions
found in the City of Tigard staff report dated September 7, 2007 and the associated record which
are incorporated herein by reference and are contained in land-use file CPA 2007-00002.
NOW, THEREFORE, THE CITY OF TIGARD ORDAINS AS FOLLOWS:
SECTION 1: Tigard Comprehensive Plan is amended to include new text and to rescind existing
tett as shown in EXHIBIT A; and
SECTION 2: Revisions to EXHIBIT A, as made at the public heating and as memorialized in
EXHIBIT B, are incor-lDorated by reference; and
SECTION 3: Tlus ordinance shall be effective 30 days after its passage by the Council, signature
by the Mayor, and posting by the City Recorder.
ORDINANCE No. 07-J,0
Page I
PASSED: ByZfi91 eZ/7-Z/1' 31'2— voof all Council members present after being read by
ntunber and title only, this-41"' day of 3C� , 2007.
Carol ,1. Krager, Deputy City Recorder
APPROVED: By Tigard City Council this _'/-/I-/�day of_/���i,L , 2007
irlksen, Mayor
Ap)roved as to form:
City Attorney
i
I
ORDINANCE No. 07-,;).p
i
Page 7
i
I
1
EXHIBIT A
I
Hazards
`7'rotecting people and property
from natural and man-made ha.Zards. "
HAzARDS
atural features provide a communit)7 with valuable resources but, under
certain conditions, these resources may also present a hazard. For
example, rivers and creeks are important for storm water conveyance,
wildlife habitat, and water quality: However, these resources can quickly threaten
property and people unless careful planning has documented flooding risk and
adequate precautions are taken. The City's commitment to protect people and
property from hazards is based on Oregon Statewide Planning Goal 7. Goal
7 lists six hazard categories to be addressed by comprehensive plans. Four of
these apply to the City of Tigard: wildfire, landslides, flooding, and earthquakes.
In addition, the City is also vulnerable to harm from severe weather and man-
made hazards.
• ;'Hazards
'To protect people and property from natural hazards."
Tigard's citizens value a safe community where natural resources are protected
and there is minimal danger; from both natural and man-made hazards. Tigard
residents value the importance of natural systems in protecting the community
from hazards, and additionally recognize that
although landslides, earthquakes,wildfires and
floods occur naturally, the effects of these events "Hazards I
are often made worse by human activities.
can i i
Hazards can have a significant negative impact
on a community's quality of life. It is important significant
for the Comprehensive Plan to provide policy
negative
direction on how the City will manage hazardous
conditions and events. Land use planning, devel- impact on i
opment regulation and emergency management
play key roles in assessing and reducing the risk to
people and property from hazards. It is important quality of
for local governments to have an understanding
of underlying natural conditions and past event
history to develop hazard mitigation and preven-
tion programs.
EARTHQUAKES
Because hazards, such as earthquake faults and floodplains, extend across
Comprehensive Plan I City of Tigard 7-1
HAzARDs
jurisdictional boundaries,it is essential to coordinate planning and emergency
response services region-wide and with the state and federal governments. For
example, due to the scale and complexity of earthquakes,Tigard coordinates
with the Oregon Department of Geology and Mineral Industries (DOGAMI).
In addition to DOGAMI,Tigard coordinates with Metro, Washington County,
and other jurisdictions to mitigate the risk associated with an earthquake. To
minimize loss of life and property from earthquakes, the City requires all
new commercial,industrial, and multifamily structures to conform to Oregon
Structural Specialty Code requirements,while single-family construction must
conform to the Oregon One and Two Dwelling Specialty Code for seismic
category D1.
WILDFIRE
In Tigard,wildfire is characterized by the Urban Interface Zone, or the urban-
rural fringe where Homes and other structures are built onto a densely forested
or natural landscape. The Oregon Department
Tigard
of Forestry implements the Oregon Forestland-
Urban Interface Fire Program,which is expected
wildfire is to be fully implemented by 2011,in order to
protect interface communities in Oregon from
cbaracterized mi wildfire.The City of Tigard works with Tualatin
Valley Fire and Rescue (TVF&R) to mitigate the
by t7ge Urban t
effects of wildfire. TVF&R is responsible for
Interface
all fire prevention and education, and has the
opportunity to comment on all development
applications. TVF&R also maps the urban inter-
face zone in Tigard.The Oregon Department
of Environmental Quality (DEQ) controls both
backyard and agricultural burning in Oregon;however,Tigard is within the
DEQ permanent burn-ban area in an effort to reduce the risk of wildfire as a
result of backyard burning.
LANDSLIDES
People and property are best protected from landslide when building struc-
tures and roads are not built within areas prone to mass movement. Although
landslides are a natural geologic process, the incidence of landslides and
their impacts on people can be exacerbated by human activities. Such human
activities include grading for road construction and development, excavation,
7-2 City of Tigard I Comprehensive Plan
HAzARDs
drainage and groundwater alterations, and changes in vegetation. The City uses
steep slopes to define sensitive lands in the Community Development Code and
has special requirements for development in these areas. When LIDAR infor-
mation is available the City will evaluate the effectiveness of this approach to
identifying landslide hazards and limiting their impact on the community. Also,
by retaining vegetation and natural drainageways in these areas, the City can
work to identifying landslide hazards and limiting their impact on the commu-
nity.The effects of landslides are often more widespread than the physical area
they inhabit, as landslides can affect utility services, transportation systems, and
critical lifelines.
FLOODING
Floods are influenced by a number of factors, including the amount and inten-
sity of precipitation,geography and geology, and development activity.The City
of Tigard cannot control precipitation or the
community's soil type but can control develop-
ment activity which contributes to, and is affected Floods
by, flooding. The City coordinates with several can have a
agencies to mitigate the risk of flooding. The
FEMA designated floodplain is used to administer devastating
the national flood insurance program (NFIP).
The floodplain serves as the FEMA flood hazard impact on
regulatory area. Within this area, development almost
activities are regulated to minimize impacts on
floodwater flows and storage areas to reduce aspect
impacts from flood events. Oregon state law regu-
lates development within the 100-year floodplain
and Tigard complies through adoption of Metro's
Urban Growth Management Functional Plan,
Tide 3.The Sensitive Lands chapter of the Tigard Community Development
Code implements Title 3 through the Clean Water Services'Design and
Construction Standards.
Floods can have a devastating impact on almost every aspect of the community,
including private property damage, public infrastructure damage, and economic
loss from business interruption. The City has been proactive in mitigating flood
hazards by purchasing floodplain property. These areas,if left undisturbed, can
act to store excess floodwater.The Oregon Division of State Lands (DSL),
jointly with the U.S. Army Corps of Engineers, requires a permit for develop-
Comprehensive Plan I City of Tigard 7-3
HAZARDS,
Event within the waters of the United States. Any disturbance to a water body
and its associated floodplain is covered through tivs process.
OTHER HAZARDS
Tigard is also at risk of non-natural or man-made hazards. Although state-
wide planning goal 7 addresses natural hazards,
other hazards are included in this chapter as the
'Tigard is
community is concerned about protection from
non-natural hazards as well as natural hazards.
also at risko W Other hazards addressed by this section may
non-naturalinclude mass casualty transportation accidents,
hazardous material releases, severe storms,
or man-made terrorism, epidemics, and infestation. Tigard
coordinates planning for non-natural hazardous
occurrences with other jurisdictions and agencies
from around the state.
KEY FINDINGS
■ The Cascadia Subduction Zone could potentially cause a 9+ magnitude
earthquake,affecting Tigard.
■ Tigard is subject to more frequent shallow earthquakes (crustal fault
earthquakes). These events typically do not exceed magnitude 4, but could
go up to magnitude 7.
■ According to DOGAMI's relative eard-iquake hazard data, fifty-eight
percent of the City is subject to the greatest earthquake hazard level,with
an additional 21% falling into the next hazard level. These areas include
developed residential and commercial areas, as well as the Washington
Square Regional Center.
■ Wood-frame homes tend to withstand earthquakes better than unreinforced
brick buildings.
■ The City of Tigard requires all new commercial,industrial, and multifamily
structures to conform to Oregon Structural Specialty Code requirements,
while single-family construction must conform to the Oregon One and Two
Family Dwelling Specialty Code for Seismic Category D1.
• The increasing number of homes being built in the urban interface zone
is increasing the threat of wildfire in Tigard. More than 30% of all land in
Tigard is vulnerable to wildfire.
7-4 City of Tigard I Comprehensive Plan
HAzA ws
■ Tigard is ,vitlun the Oregon Department of Environmental Quality's
permanent burn ban area, so backyard burning is not allowed anywhere
within Tigard.
■ The most common type of landslide in
Washington County is caused by erosion.
■ Landslides widun Tigard have historically not "'Floods are
caused major property damage. However in _. /
other parts of the Portland metropolitan region
they have caused considerable damage. most
• It is estimated about 3% of the City's Iand, or
fuently
286 acres, is vulnerable to landslides. req
■ Human activities such as deforestation, stream
occurring
alteration, and urban development Nvithin the
Tualatin basin have significantly altered the natural
hydrology of the watershed. This has resulted
in increased water runoff and greater potential disaster.
for flooding.
• Floods are Tigard's most frequently occurring
natural disaster.
■ The 100-year floodplain includes six streams and 7.9%of all land area in Tigard.
■ As of June 2006,Tigard owns 34% of the 100-year floodplain.
■ Tigard residents are concerned about the effects of all other hazards on the
community.
GOAL
7.1 Protect people and property from flood, landslide, earthquake,wildfire,
and severe weather hazards.
POLICIES
1. The City shall not allow development in areas having the following
development limitations except where the developer demonstrates that
generally accepted engineering techniques related to a specific site plan
will make the area stdtable for the proposed development:
A. areas having a severe soil erosion potential;
Comprehensive Plan I City of Tigard 7-5
HAzARDS
B. areas subject to slumping, earth slides, or movement;
C. areas having slopes in excess of 25%; or
a areas having severe weak foundation soils.
2. The City shall favor the use of non-structural approaches to hazard
mitigation.
3. The City shall coordinate land use and public facility planning with
public safety providers (law enforcement, fire safety,and emergency
service providers) to ensure their capability to respond to hazard events.
4. The City shall design and construct public facilities to withstand
hazardous events with a priority on hazard protection of public services
and facilities that are needed to provide emergency response services.
5. The City shall apply and enforce the most current building code
standards to protect the built environment from natural disasters and
other hazards.
6. The City shall enforce standards requiring the creation and maintenance
of defensible space around habitable structures located in wildfire
hazard areas.
7. The City* shat] comply with the Federal Emergency Management Agency
(FEIVLA) flood regulations,which include standards for base flood levels,
flood proofing, and minimum finished floor elevations.
8. The City shall prohibit any land form alterations or developments in the
100-year floodplain which would result in any rise in elevation of the
100-year floodplain.
9. The City shall not allow land form alterations or development within the
100-year floodplain outside the zero-foot rise floodway unless:
A. The streamflow capacity of the zero-foot rise floodway is main-
tained; and
B. Engineered drawings and/or documentation shows there will be no
detrimental upstream or downstream effects in the floodplain area.
10. The City shall work with Clean Water Services to protect natural
drainageways and wetlands as valuable water retention areas and,where
7-6 Cite of Tigard I Comprehensive Plan
s
HAzARDs
possible, find ways to restore and enhance these areas.
11. The City shall comply with Metro Title 3 Functional Plan requirements
for balanced fill and removal in the
floodplain.
12. The City shall encourage pervious, "The Cit.- shall
and minimize impervious, surfaces to work to reduce
reduce storm water runoff.
the risk of loss /
13. The City shall retain and restore
existing vegetation with non-invasive lif- and damage
species in areas with landslide topropertyfrom
potential to the greatest extent
weathersevere
possible.
14. The City shallwort. to reduce the risk
of loss of life and damage to property
from severe weather events.
RECOMMENDED ACTION MEASURES
i. Place land acquisition priorities on high hazard areas to he used for
recreation or open space purposes.
ii. Update and maintain accurate information regarding natural hazard risks
and past events.
iii. Publicize and maintain maps of high hazard areas.
iv. Address planning for the protection of public facilities and services from
hazards in the Tigaazl Public Facilities Plan and Conemunit'InresIment Plan.
v Retrofit existing public facilities and services to contemporary standards
to better withstand natural disasters and hazardous occurrences.
vi. Recognize some existing buildings have not been built to contemporary
building code standards and seek ways to encourage their retrofit to
modern codes.
vii. Design and Implement a natural hazards home inspection program.
Comprehensive Plan I City of Tigard 7-7
HAZARDS
viii.Update and maintain a list of essential and critical facilities to be used in
hazards planning.
ix. Work with Tualatin Valley Fire and Rescue Community Safety Program
to provide information and education about urban interface-wildfire to
Tigard citizens.
x. Adopt the Tualatin Valley Fire and Rescue Wildfire Hazard Map and
implement the Wildfire Hazard Mitigation section of the Oregon
Residential Specialty Code.
xi. Provide information and access to resources for property owners who
wish to assess the ability of their buildings to withstand natural hazards.
xii. Continue to maintain eligibility for the National Flood Insurance
Program.
xiii.Research and implement standards to ensure only appropriate land uses
are allowed in high hazard areas.
xiv. Complete the Tigard Natural Iazards Addendum to the vVashington
County Natural Hazards Mitigation Plan and include risk assessments
and mitigation action items.
GOAL
7.2 Protect people and property from non-natural hazardous occurrences.
POLICIES
1. The City shall design, construct, and coordinate the surface
transportation system to reduce the potential for mass casualty accidents
and to provide the ability to evacuate when necessary.
2. The City shall encourage communication and coordination among a
wide variety of agencies to respond to technological and roan-made
disasters.
7-8 City of Tigard I Comprehensive Plan
a
HAzARDs
RECOMMENDED ACTION MEASURES
i. Keep a current inventory of locations where hazardous materials might
pose a danger to the public,including storage and transportation areas.
u. Update and maintain the Tigard E»>eigeng, Openitions Plan to ensure
essential governance and public safety services are available during a
disaster.
iii. Continue to work with the Washington County Office of Emergency
Management to:
A. coordinate emergency preparedness education for Tigard residents;
B. provide ongoing responder training and exercises;
C. coordinate regionwide hazards response; and
D. provide hazards information and resources countywide.
iv. Continue to implement the Community Emergency Response Team
(CERT) Program for community members and City staff.
v Encourage projects that enhance medical treatment capabilities and
capacity.
Comprehensive Plan I City of Tigard 7-9
3. NATURAL FEATURES AND OPEN SPACE
This chapter addresses a broad range of topics all having to do with the natural resources located within the
Tigard Urban Planning Area. This chapter reflects the concerns expressed in several of the Statewide
Planning Goals including:
Goal #3 - Agricultural Lands; Goal #4 - Forest Land; Goal #5 - Open Spaces; Scenic and
Historic Areas and Natural Resources; Goal #7 Areas su e t le Natural Disasters and
Hazards; and Goal#8- Recreational Needs.
The natural environments within the planning area offer many opportunities for a unique and healthy urban
development. Those environments, when viewed as a series of systems rather than isolated features, will
provide Tigard with those elements necessary for a healthy place in which to live, work and play. .Floodplain
greenways, for example, can provide the community with an excellent system of open space links between
neighborhoods and services, in addition to providing a relatively inexpensive system for storm water runoff. It
is to the community's benefit that consideration be given to both the opportunities and the limitations of the
various environments within the planning area.
The natural environments included within the planning area all have their own respective limitations with regard
to urbanization. Development pressure upon lands with such limitations can have profound effects on the
environment. Erosion of steep slopes caused by inappropriate development, for instance, does not occur as
an isolated incident. Soil type, permeability, vegetation and drainage all play major roles in and are effected by
development. Likewise, the effects of inappropriate development located within the floodplain areas could
have adverse effects on properties both up and down stream from the development site. The social, cultural
and economic values of such resource lands could be reduced by the effects of urban development nearby.
The limitations of the various environments should be considered in reviewing new development within the
planning area.
The recognition of the natural environment in the planning area and the development of findings and policies
which address the characteristics of the environment are extremely important elements in the Comprehensive
Plan. The purpose of this chapter is to define the parameters of the various natural environments in the
planning area and to identify the limitations and opportunities inherent in those environments.
Additional information on this topic is available in the "Comprehensive Plan Report: Natural Features and
Open Spaces."
3.1 O4�ycrm SIGAL LIMITATIONS NATI IRA] H.A.-74.1RDS AND WETLANDS
F�ndinge
'ese-e 44d have -aireG#relatiOR&hip te the4ype
and-der�si# -sf de�relepmeat�rk►isf� same-accommodated-e" that (Ga R9 capacity)-.
SsFF►bir�atieF}s si�asSteep-61[epe8 and-VRF4able seilc ^r- .iIGPFnAni-GARA Fair
€ s8ss+ve dev2iepMent-in-suck►-physically limited areas greatly_.,,GFRARPS the-peteRtial
landslide;earthquake-dam ge-#ieeding,etc:
Many-PaFt+eas Af the#leedplofn-aFea s9a#a+n-n2#61Fal-aspect6 sgn+f Gan#-vegetation, wiirlr,n,d"f, and
scenic-areas-,-and-aFe.aluable-far-spen-space and4esFeatian-
VeqBt2t Se a^ essen4al-elemef}l in-FuAeff-and erGsiea control;as-well-as-feF-the-PFetestienand
natural-habitation of wildlife N9R6tI49IeGG, it e PARR-renaeved-and-replaced by IJu4Gin9s--GF
impervious s4+4aee�
ue t9-t#e0ene694&-and geologic-Mappia9-,-64 spesif4G-anaIysis-is-a#ten-nesessar e
determine-the-PFesense ef-geslegic hazaFds aR e-&ori#y--e€--ssiJ--PFebteFFls whiGh-are ^ RStFai„tS t9
develepMeRt. SuGh geolegiG h2zaFds gmist whenreFtain Ggml3kiatiens-Gf slope;soil;-Eared}-bedFesk-and
rpaisture rendaNand unstable:
F-=a4h#lew-and-slurp-areas-exist in-hill+sestisns of-the-planrsing-area aR Fe associated-with-PeeF
drainagess ailew-subsurface #low-en-grei4Rd nater-and-SpFiRgs,A4-h49 I--sWssept+bili4, tG reP'.
€artt4Gwand 6lurp-essurrenses Gan-deStrey-Fsads-and-bu+ldinge;aR dye rsel„ a#e Gt wateFlitu-:
Mass4rseverent-iae-net-resulted4n-any4RajeF4ess ef-life-or-prepe us4ar�eGausalittle-in44eanray g#
urban develeprent�.srotr ^ th serious-problems.
CPA 2007-00002 Vol. II, Policy 3-1 Exhibit A
City of Tigqrd 7-10
In^���c^ ,,^e# -arid-sed+eaeataiela- raaa--paar -deelae4lsides--safa-req�+ire-insfeasaa�--p�lis
expeditures fef4eed-af4d-eFesiOR seetFel-and-stefm watep m gemant
•- ---The Oity Of Tigard had adepted a"Hillside Dev lepmeFt Pre-isieF"with' sitave Lands,94Raf4Ge
wh4oh FequiFes-additino�l-rppeIam�- € hese deyelepmest-s.
Th fel ew-de elG eRtS tG haVe StOFM , �ateF-FURG4 12R„--to
�" � -''T l� �PTv �iRSUFe-aha
adverse ef#este saIshFasiOR and sedePA
POLICY
3.1.1 THE CITY SHALL NOT ALLOW DEVELOPMENT IN AREAS HAVING THE FOLLOWING
DEVELOPMENT LIMITATIONS EXCEPT WHERE IT QA'N'I-RE SHOWN THAT-ESTABLISHED
AND PROVEN THE DEVELOPER DEMONSTRATES THAT GENERALLY ACCEPTED
ENGINEERING TECHNIQUES RELATED TO A SPECIFIC SITE PLAN WILL MAKE THE AREA
SUITABLE FOR THE PROPOSED DEVELOPMENT. (NOTE: THIS POLICY DOES NOT APPLY
TO LANDS DESIGNATED AS SIGNIFICANT WETLANDS ON THE FLOODPLAIN AND
WETLANDS MAP.):
a. AREAS MEETING THE DEFINITION OF WETLANDS UNDER CHAPTER 18.26 OF THE
COMMUNITY DEVELOPMENT CODE;
h. AREAS HAVING BVERESO11 ElRGSIGNl onTENITIAI •
G AIREAS CI IR EGT-TO SLUMPING,MPIN G EAIRTH C1 I1DEC OR NIGVEMENIT•
(AAOEAS HAVING SI OOPS INI F= 6999 OF 25%j OR
AREAS HAVING SENIFIRE IOWAK F01 INDATION SON C
e. rn-tc-rlv--r-'�-r�rrcvL r��Zt-rr�-r-i cc.
(Rev. Ord. 85-13; Ord. 84-36)
JNAD ENITATIG)NI CTCJATF=GE-&
1. A.MaS h2V1RgiGa,1 IiFFlRAI ORS (pear drainage, seasonalmay besabjest4s
peky^3.1r1-of-the GampFaheRSWe Plan,
2.Th Rsiti s L ads sestieR e# #e�igaFd-CaFaF a elapfReRt Serle to ideRt4y
the standaFds and defiRe-these areas having distiRS ssRstFaiRts ani-fin*atiens
3. The Gory shat epeFate with othep ageRsies to help ideRtify these aFe2S.
4. The-Gi"f- igaFd shall-pFevide4n4he-GGmmui4ity-DovelepFRe4-Gadea-pFawsian aF hermit to Fegoire
site speai€isi--saR,eys-and-geG14G-studies-wheFe p teRtial-hFds are-ideFtiged-based apeR
available-geelegr-and Goilde-RAP WhGR RatUFal hazaFds aFe ideR#ifie474he Gityil,=ll,egwiFe-that
special--design-GaRsider- t ERs-and-GGR&#UstieR-measeyes-be- keR--te-offset-the-se"R"eelegis
e6Rs#aiR"FeseRt in AFder to pFeteet4ife-aR"rapeq, and to pFateGt eRN` 9RFRenta4y seRrifl„e aFEarr.
5. The�aFRFRURity�BeValaprReRt GO& Shall--Rat-oFFRit develep-ments-te-be-planned-sF-1esated-4n-k4;aWR
aFea� ^f RAfiAfi wal4sasters and haaards without-apprepFiate safe
3.2 F1=009PLAINS
F4ndiRgs
Trhhe-objec4ve-af4he-G4tyAs-to-Use-tlae-detailed4RfGFMatieR-gatheFed-eR-49odplaiRs-frGR4 he U.S. ,p
GoFPs Of€R&8eFS,and develop-policies-to:
1. Go-Mml deuelopFReRt-as-to Rly affeGt the fig PlaiR aoedway aFeasi
CPA 2007-00002 Vol. II, Policy 3-1 Exhibit A
City of Tigard 7-11
3. Mini nine-tfie-runeff-emsien-impaet of de slepFReat-9R4-he--serFeefldiflg-ai:ea-aed--dewRstfeam
PFGpefties=and
3. Emphasize the reteen-a#--a-vegetative-baa#er-aleag-st4:eaFns-ar,4d-drainageway&,4e-redeee r-aes##
and-flood-damageand prey+de-eresier-aad-siltatiereea#e1-
I-add+tier-there4&4he-is&ue Gf the semula4Ve-et#est-ef-developmeR"pstream of Tigard. Peed levels
in-Tigard-will-be sub ntia-!"eterraiaedby the ssrrtrols-exercised-eveFdevelepment-eetside-the—plaR
area, I-as-nsimde P anning
T;e-F-aRRA Gree"Fainage-systeslades--Rumereus-smelt-water-seorses Th tegr y eftthese
natural-drainageways is intri^ lly-searaested le the-systems-sapaoity-teabserb eXGessive-Funef�-aad
sn-srabse$uen#-fl n-,-however, waterGeurses--are aitered-4s-prev+de-MGFe-usable-land—#
alterations-aro-done-lasorrestly-impacts-oan-be adverse If the-4rapastS are dversethey-san-be
detriMeRtal-te-the entire-drainage system,i.e., ttarageGapasity of the-water Course-is-{essened-and
fleed+ng-esseFs. In fi4st, inn-iewer reackEes-iNs--boaefiGW ft; have mere wateFaaeve through at-a-faster
r
ate-
=oenides-the bas.�eed tG Gea#e1-developa�e^' '^ 'rr�,fleGd prop^areas, it Was F^oRd that publ+o IEnowledge
of flood-plain-hazards-was laslting. MaRy of t bstrustie►rs-previeus"[aoed-in-the-Heed-plain-were
the result-of-a4ask-off infsrmatieFl mad-adequate-nfnof�predistiensabeut-potential-#iood+ng-problern�
These ebstruetiens (e.g., Maip Streridge}-kinder-the-flaw-ef-high-water-and-tend-to-increase-Heed
levels.
Proper-adnp+nistFati9R of the leodplain@rea6 Felies-heavily upenA-he availability efdequate4geFn}2tien
uperwhiM te-asset Fe}est—The-develepment,whish rremtp he
need, she ald-ba-rasp ble-feF-pFevidiRg the city wit +hG RE) y-data-fGr mak+ng-&cund-decisions:
The-baFdea-is-errthe-applisa#to prove that a-prejest-will-nGt adversely arrerimen,ire;orppte
t�ndae-#k►tt�re-liabilities�er�he-City:
T ham, r MThe U.S. n F r ---9 €i girieeps, has established aR area
designated-within-the4-99-yeaFfleedplain-
The Gita of Tigard Inas been accepted as an eligible-area fm 4; M;;tienal-F4aed.4nser.RGe oF^gFaFR ^r,
as-a-Fesalt-Head-insl4ranse-Will-be available-tG prepe"wneF6-4n4eed-pr9ne-areas.Th der-at
pFogram,howeveF Feq-uyFeG the City to adGpt-anFdinanse whieets-eertairi-fed eFa1 staradardS.
The-city-ef—Tigard-currently-has-eFdinanses—Pelisias-and-s#andaFds-within-the-T4gard-Gemmunity
8evelepmeRt Gode which-pF9pAde adequate 9errtFalster dev lepmeni within floodplain areas-
^wFdin ge44aster-Ian Study-sondasted-by-GIi2M44ill-fer-the-Gity, fleed-leveis�f
Al I of 4hor thou the A-Xictinn 'Inn_„nn�QGdPlarn FR@Y F.�e�dif RE) G ea$��r$s
are taken �T�*9 r^r era
TeFFete`'t t�rthe-iRtent-o` the t e-Gity's-6Foenway pelicy-,44e-GFeem ay is de€ined with the same phys sal
beundaries as the 490 year;;eedplain boundary:-(Rev-Ord.95 4 3)
RoNS4l=9
242.1. THE_CITY_SHALL PROHIBIT ANY 1 anlnnn n1 T�oDnT WS OR nF=\/F=l nFAITS IN THF=
100 YEAR FLOODPLAIN %.'-HIGkI tnNQIJI=B-R€zS'a''T Inc ANY olcc lPl .OF THE
400 YEAR n nnoal,LAIN.
3.3.3 THR CITY SMALL:
a PROHIBIT I AND FnRzM Al TFRATInnIS AND DRIED nRAAEnIT In! THE R nnn{AIAV*
F=UNGTION AND 9€€ F TSE 7F=.Rn_Fn�ISEFI=Qnn,nY*•A
At 1 ON AND F=QRM nl TERnTlnnlc n[a nF\/CI nonny In: TrH€ F= OnD L�4t^rr
9JTSIBE THE Z€RG FOOT RIS€ P1 999WAY-!k GH Rr.-RRF=eFP1/F�R FN G9
THE FI INCTlnnl OF THE ZERO FOOT RISC CI nnnt N.A.W RROVInCn•
CPO 2007-00002 Vol. 11, Policy 3-1 Exhibit A
City of Tigatcl 7-12
1. THE LAND-FOR44-AI TES P9)R, L RENT IS IN AN ARE
n> s1GNnTEo cQ5.0.1€RCIAI1_ 9F NI-DUSTRIAL ON THE
PLAN LAND USE MAP, AND FACTORS SET PORT-H IN POLICY '32_2rn�E
SATISFIED; OR
2. THE LAtNDFO��M-ALTERATION nRlnlno n€V€LORME-IIIT IS 05.220CIATGED
141TW GOMMl IAIITV REGREATION I ISES, UTILITIES, OR D �RIr CvPPORT
FACILITIES AS IDEFINES IN QW.A.PTER Wi4.^-,-2 gl= THEnnRSO,Y, UNITY
DEVEI nIRMENT GODS ARID TUE EnrTP R-9 CET FORTH IN onl Iry 3.2.3 GAN
%4WERE LA INID FORM AALT€F��4TI9NS-AND DEVEL9,-,ME^ IT A'F= '4LI OWED WITH .E
x
RF=01 11R
a. TH€ aTRE-AM€L9'^�CA4PA5SITY BF THE €Rn ^�T RISE I=L9nn�n,ITIE
Ia4AINXAIAI€D;
b E�•LrgI EGIRCn IDRAWI NGS ANDD QIR D00 IM G^ITA TI n^I 2WQ1 IN l`_TUAT THERE 1M1f
R I ILL
o€ ^IO D€TRINIENTAIL UPSTREAM GR DOWNSTREAM E;=TE-GT�S IN THEI
F���oI ^I
nl • AREA, AND THAT Tu€ rIRTcoIA�cCT�nIR u IR�TUE�F^IC�ITING
I AISIPS CGrTION OFT-HE rnnE I-I n\lE BEEN MET(See FIE;Sepitnember 1981.)i
6 A
BUFFER, EITHER EXISTING OR IRI ANTEI'l GN TUE GQW11EI7r1^I n� l^Inl ICTEIn1
LAND ^oma INr. ... ........... LA^I,-.;TWHIGH A4B€Qkl,llT€LY SSP�EEPI•�T-kl€
nEVEI QPMF=NT FROM 111WA1 RV TUG An QINIRIG RESIDENTIAL 1=40, ARlfl lAful!'`u
I�..e�'ISIt=F-IGI€PIT 1A!I DTW TO R€-NQIQE-A_CT E-ISII IATI^ gin
d. THE G'ONSIDERAT-IG F QEDICATIn^I nG=noG^I I A^ID AREA GREENWAY-
FOR-TWV= Q'g^ICTRl IrTInRI OF A PEDESTIRIANIBI�PLI_ PAT T,,AIAV 1n1ITHIN TUG
€I=GBDP6AIfN* IN ^—,zG .RDAINCE WITH THE 4D9RTCr-rRID PEDESTRIAN Rlrvrl G
RATWAIAV oI AAI
3.2.4 THE CITY SHALL PROHIBIT DEVELOPMENT WITHIN AREAS DESIGNATED AS
SIGNIFICANT WETLANDS ON THE FLOODPLAIN AND WETLANDS MAP. NO
DEVELOPMENT SHALL OCCUR ON PROPERTY ADJACENT TO AREAS DESIGNATED AS
SIGNIFICANT WETLANDS ON THE FLOODPLAIN AND WETLANDS MAP WITHIN TWENTY
FIVE (25) FEET OF THE DESIGNATED WETLANDS AREA. DEVELOPMENT ON PROPERTY
ADJACENT TO SIGNIFICANT WETLANDS SHALL BE ALLOWED UNDER THE PLANNED
DEVELOPMENT SECTION OF THE CODE.
3-?5 THE CITY SHALL REQUIRE THE NSIn�DER TION OF DEDICATION 9F= All
L1NL?€VEL9I�EB-LAND 0.11TUIRI TUE 100-YEAR FIC)MRIAINI PLUS cI�IGGI,(;Ir=NIPEN
LANDD FOR GR€€NWAY of I ,POQ€SSDEGFIGALLY IDENTIFIED FOR-R€CR€ATIIONI
WITHIN PLAN.
The Fleadpleln and_GI-, ,00Q,�l,,,ey, as defined
effective FebR.ary 18, 2905-.
(Rev. Ord. 05-01; Ord. 98-19; Ord. 90-22; Ord. 85-13; Ord. 84-36)
3.3 NATURAL RESOURCES
Findings
• Currently, there are extensive rock and gravel extraction areas located to the north and west of Tigard's
planning area within Beaverton and Washington County.
(Rev. Ord. 01-07)
• There is one active mineral or aggregate resource within the Tigard Planning Area, known as the
Durham Pits,which is operated by Washington County.
CPA 2007-00002 Vol. II, Policy 3-1 Exhibit A
City of Tiggrd 7-13
EXHIBIT B
[i
r
MEMORAN" DUM
TO: Mayor Craig Dirksen and Members of City Council
FROM: Darren Wyss, Associate Planner
RE: Council Hearing- CPA2007-00002
DATE: December 5, 2007
At the December 4,2007 City Council meeting, CPA2007-00002 was adopted with revisions
that are memorialized below.
Key Findings shall read:
Floods are Oregon's Tigard's most frequently occurring natural disaster.
Goal 7.1 Policy 12 shall read:
The City shall encourage phis and minimize impervious surfaces to reduce stormwater
runoff.
ORDINr1NCE NO. 07-20 1 EXHIBIT B
CPA2007-00002
l