Resolution No. 79-45 /7
CITY OF TIGARD, OREGON
RESOLUTION NO. 79-.CJS
A RESOLUTION ADOPTING RECOMMENDATIONS TO FURTHER THE IMPLEMENTATION OF THE
ENVIRONMENTAL DESIGN AND OPEN SPACE PLAN OF THE CITY OF TIGARD.
Acknowledging its earlier passage of the environmental design and
open space plan of the City of Tigard and its commitment to that plan and
to satisfy at the earliestpossible time the obligation to accomplish its
planning and development work in accord with the goals and guidelines of
the Land Conservation and Development Commission of the State of Oregon,
and having received the recommendations of the planning staff of the City
of Tigard with regard to methods of implementing the adopted "environmental
design and open space plan, the City Council by this resolution expresses
its intention to implement the environmental design and open space plan by
the methods recited in the attached memorandum.
PASSED: This _2t, _ day of 1979.
� X
, CITY OF TIGARD
ATTEST:
CITY CORDER, 'CITY OF IGARD
RESOLUTION NO. 79- �
,
MEMORANDUM
TO: City Council
FROM: Planning Department
SUBJECT: Amendment of the Official Environmental Constraints Maps
(Environmental Design Plan)
DATE: December 26, 1978
Recent information about the extent of the 100-year flood plain in the Tigard
Plan Area necessitates modification of one of the previously adopted Environmental
Constraints Maps.
Ash Creek between Oak Street and Highway 217
Staff requested review of the City's official Environmental constraints Maps
by the Washington County Public Works Department earlier this year. The
only significant difference between the City's maps and the county's (at scale
1" = 1001) was along Ash Creek north of Highway 217 (1S1 35 NE). In a letter
(dated June 20, 1978), the county identified the 100-year flood elevations as follows r.
(City estimates as mapped in parenthesis): 171 feet at Oak Street (164), 170 feet
at Pine (164), 166 feet at Thorn (164)•
Staff Recommendation
Inview of the more precise data now available, staff recommends az_ndment of the
Environmental Design Plan (Environmental Constraints Maps )as follows:
o Adoption of the Washington County Public Works Department estimate of
the 100-year flood plain elevation along Ash Creek between Highway
217 and Oak Street.
Amendment of the Design Review Ordinance (Chapter 18.59) to
Provide Greater Consideration of Topographic Features
Policy 9. In order to realize a sense of integrated community design, the
design review ordinance shall be modified to include specified
landscape objectives, emphasizing the incorporation of natural
vegetation and unique topographic features in site design. Careful
consideration should also be given to the 3600, 3-dimensional
impact of a site and structure design.
Findings
1. The Design Review Ordinance 18.59 was significantly modified earlier
this year (January 15, 1978).
2. Some current provisions of the Code address aspects of this policy.
For example, 18.59.060 (d) (2) (C) calls for "maximum retention of
trees" and 18.59.060 (d) (3) (E) in effect provides for comprehensive
consideration of the 3600 aesthetic impact of a development.
3. There is no explicit requirement that a topographic map be submitted
to help guide staff review of a proposal's incorporation of "unique
topographic features" or the natural contours of a site generally.
4. There is no explicit requirement that an inventory of existing trees
be provided to assist in a decision about which will be retained.
Implementation Recommendations
The Design Review Ordinance should be amended as follows:
18.59.60 Design Review Procedure.
(c) Application for Design Review....
At a minimum, the design plan must contain, as appropriate, the
following:
1. Site plan, showing topography, (including3 and vicinity map ...
(d) Standards and Criteria
2. Project Development
(D) It shall reasonably conform to the natural contours of the site,
incorporating special designs, where appropriate, to accommodate unique topograhic
features;
(E) it shall provide a minimum onsite landscape area ...
(Also see the staff report on tree conservation)
r ]- to be deleted
-x
,r to be added
Amendment of the Nuisances Chapter (7.40) of the City Code
Dealing with Noxious Vegetation
Poles of the Environmental Design and 0 e Space Plan
Policy 5. - Calls for regulation of the removal of natural vegetation
in designated areas
a
Policy 9. - Calls for modification of the site design review ordinance
to emphasize natural vegetation.
Findings
1. Natural vegetation of an unimpressive character - eg., brambles,
brush, tall grass, shrubs, small trees -- nevertheless serve im-
portant functions to the community. Such vegetation helps reduce
runoff and erosion, promotes slope stability, and is required
habitat and a prime source of food for many wildlife and bird species,
among its other uses.
2. Other proposed measures for implementing the Environmental Design
and Open Space Plan will protect natural vegetation in only specified
parts of the City.
3. The existing City Code, under the Nuisances Chapter (7.40), actively
encourages the removal of natural vegetation (Noxious Vegetation
7.40.020).
4. This provision of the Code, while originally intended as a fire
hazard reduction measure, is not actually based on the iform Fire
Code, which specifies a firebreak width of 30 feet (Appendix , I'
Section 16).
I
implementation Recommendation
The Planning Commission recommends the following code
modificationc because,consequence
the clarifying language pertains to the fire code provisions,
be reduced incentive for property owners to needlessly cut back vegetation on their
land:
The City Code section dealing with Noxious Veggettation.(7 0.020) s£eetdofea building
revised
by adding the following wording after "... p p y, -
or street."