vegetated swales, street trees, green streets Seattle has been working at green infrastructure for over a decade, and its commitment over many years has resulted in a serious overall program. The city does not yet have a comprehensive citywide green infrastructure plan; its Comprehensive Drainage Plan is generally supportive of green infrastructure (which it dubs “natural drainage strategies”), but does not spell out an overall vision of its implementation. On the other hand, Seattle contains broadly-applicable requirements to use green infrastructure “to the maximum extent feasible, ” for both new and redevelopment projects and the city requires certain projects to achieve specific numeric targets for peak runoff following development. Seattle has strong resources to assist private parties to implement green infrastructure and an equally major investment in implementing green infrastructure in practice to achieve stormwater and CSO reduction goals. Specifically, the city has stormwater and right-of-way improvement design manuals laying out stormwater design strategies for different kinds of projects, and it has demonstrated gree
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