SS Credit 6.2: Stormwater Design—Quality Control 1 Point Intent

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SS Credit 6.2: Stormwater Design—Quality Control
1 Point

Intent
To limit disruption and pollution of natural water flows by managing stormwater runoff.

Requirements
Implement a stormwater management plan that reduces impervious cover, promotes infiltration and captures and treats the stormwater runoff from 90% of the average annual rainfall1 using acceptable best management practices(BMPs).
BMPs used to treat runoff must be capable of removing 80% of the average annual postdevelopment total suspended solids (TSS) load based on existing monitoring reports. BMPs are considered to meet these criteria if:
--They are designed in accordance with standards and specifications from a state or local program that has
adopted these performance standards,
OR
--There exists infield performance monitoring data demonstrating compliance with the criteria. Data must
conform to accepted protocol (e.g., Technology Acceptance Reciprocity Partnership [TARP], Washington
State Department of Ecology) for BMP monitoring.

Potential Technologies & Strategies
Use alternative surfaces (e.g., vegetated roofs, pervious pavement, grid pavers) and nonstructural techniques (e.g.,
rain gardens, vegetated swales, disconnection of imperviousness, rainwater recycling) to reduce imperviousness and promote infiltration and thereby reduce pollutant loadings.
Use sustainable design strategies (e.g., low-impact development, environmentally sensitive design) to create
integrated natural and mechanical treatment systems such as constructed wetlands, vegetated filters and open channels to treat stormwater runoff.

SSC6.2: 雨洪设计—水质控制
1分

目的
雨水径流管理，限制自然水体受到污染。
要求
采用最佳管理实践(BMPs)方法，实施雨洪管理措施，减少不透水铺装、本地渗透、雨水收集和
处理等，处理年均降雨量的90%1。
BMPs所采用的雨水径流处理必须能除去雨水径流中80%的总固体悬浮物(TSS)，依据已有检测报
告确定。BMPs符合以下规定可认为符合该要求：
--设计遵守州的标准和规范、采用这些效能标准的地方计划；
或者
--有现场效能监控资料说明其达标结果，资料需符合可接受的BMP监控方法的要求。（例
如技术验收互助伙伴组织[TARP]，华盛顿州府生态机构）。

技术措施和策略
采用替代地面（如种植屋面、透水铺装、花格地面）和非结构技术（如雨水花园、种植洼地、分隔不透水区域、雨水收集）减少不透水率，促进就地渗透，减少污染物。采用可持续设计措施（如低污染开发、环境敏感设计）来整合自然和机械处理方式，例如人工湿地、种植渗透、明渠等，来处理雨水径流。