Development Standards—Landscaping and Irrigation | Town Center
D. Landscaping – Drainage
v. The planting and bioretention soil media shall consist of a bioretention soil mix in accordance with the January 2009 WSU Pierce County Extension “Bioretention Soil Mix Review and Recommendations for Western Washington,” or equivalent. vi. No plants included in the King County noxious weed list.
Detention facilities shall be designed and landscaped as a visual amenity and environmental restoration. 1. Revisions to plans or additional landscaping requirements may be required to ensure that the proposed landscaping provides a visual amenity and environmental restoration. 2. Trails or walkways may be incorporated into the landscaping plan. 3. Landscaped areas should be topographically lower than surrounding areas, where possible, in order to facilitate surface water drainage to these areas.
7. Type VII Landscaping – Green Roofs.
a. Type VII landscaping refers to vegetated roofs, living roofs, eco-roofs and rooftop gardens. These roofs feature vegetation on top of a growing medium with drainage, water storage and root barrier on top of a roofing membrane and structural support. b. Type VII landscaping shall be constructed, planted and maintained in general accordance with the 2005 Puget Sound Action Team Low Impact Development Technical
E. Landscaping – Surface parking areas
Parking area landscaping shall be provided within surface parking areas with 10 or more parking stalls for the purpose of providing shade, diminishing the visual impacts of large paved areas, and providing stormwater management. Island and planter strips shall be designed to work as rain gardens, sloped grading and curb cuts. Surface parking areas shall be as follows: 1. Residential developments with common parking areas shall provide planting areas at the rate of 20 square feet per parking stall; 2. Commercial, industrial, or institutional developments shall provide landscaping at a rate of:
Guidance Manual for Puget Sound, the adopted Sammamish Stormwater Code, or equivalent.
c. Type VII landscaping shall minimally consist of:
i. Trees (in the case of rooftop gardens only), shrubs, and groundcovers adapted to harsh conditions, including seasonal drought, high winds and strong sun exposure. Plants should be adapted or native to the installation area. ii. With the exception of rooftop gardens, plants should have compact forms and require very little maintenance and pruning.
a. Twenty square feet per parking stall when 10 to 30 parking stalls are provided; and
Effective | January 1, 2022
Title 21: Sammamish Development Code | 513
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