Development Standards—Design Requirements | Town Center
d. Visual Standards for Stormwater Management Ponds and Biofiltration Swales and Other Stormwater Management Features (Reference SDC 21.07.070 ). i. Intent. To integrate detention ponds, grass swales and other features into site design while maintaining biofiltration efficiency. ii. Where possible, integrate biofiltration swales and ponds into the overall site design. Methods of filtration are listed below in order of preference: a) Locate biofiltration swales, ponds, or other approved stormwater management systems as part of a landscape feature such as a screen, natural area or garden. Trees may be planted near the grass swale as long as they do not substantially shade the grass within the swale. The swale or pond should be designed so it does not impede pedestrian circulation or shared parking between two or more properties; b) Where topography is favorable, locate the biofiltration swale, wet pond, or other approved stormwater management system within the paved parking or service area. The swale or pond should be landscaped as part of the required internal parking lot landscaping and oriented so it does not impede pedestrian circulation; or c) Locate the swale along the front edge of the property. Incorporate landscaping and screening to visually enhance the swale without reducing maintainability and sun exposure; and
standards and requirements in the Stormwater Master Plan for the Town Center. i. Rain gardens and similar landscape measures to treat stormwater may be counted as part of landscaped open space, pedestrian-oriented space, and common open space for the purpose of meeting the requirements of SDC 21.07.060A.9.; provided, that the director finds that they are located and designed to enhance the visual, pedestrian-oriented or residential qualities of the development as well; ii. Green roofs may be counted for up to 50 percent of the required multifamily residential open space required in SDC 21.07.060A.9.c. if there is access for residents to the roof and elements, such as seating to allow them to enjoy the space; iii. Stormwater ponds meeting the requirements of subsection 4. of this section may be counted as landscaped area in meeting the requirements of SDC 21.07.060A.9.; and iv. Areas where native vegetation is retained may be counted as landscaped area in meeting the requirements of SDC 21.07.060A.9.
Effective | January 1, 2022
Title 21: Sammamish Development Code | 471
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