Low Impact Development Technical Guidance Manual for Puget Sound
The purpose of the Low Impact Technical Guidance manual is to provide stormwater managers and site designers with common understanding of low impact development (LID) goals, objectives, flow reduction credits, and specifications applicable to the Puget Sound region. Continued research and distribution of the current state of knowledge through this document and other forums will facilitate the application of LID tools toward the more effective management of stormwater runoff and protection of our streams, lakes, wetlands, and Puget Sound.
In addition to the guidelines for specific practices, this manual provides research and data related to those practices to help managers and designers make informed decisions when adapting LID applications to their jurisdiction.
Low Impact Development is a new and evolving management approach; accordingly, this document will evolve and be periodically updated as additional research becomes available and designers gain more practical experience in the region. This is a technical manual and the information provided is targeted for engineers, planners, landscape architects, technical staff for policy makers, and developers.
How the Manual is Organized
Chapter one of the manual sets the context for the LID approach with an introduction to Puget Sound lowland hydrology and the effects of urban development on streams, wetlands and Puget Sound. Chapter one also establishes the goals and objectives of LID.
Chapters on site assessment, planning and layout, vegetation protection, and clearing and grading follow and emphasize the importance of planning and conservation of native soils and vegetation in the LID approach.
Chapter six provides general guidance for six integrated management practices (IMPs), as well as detailed construction and material specifications for many of the IMPs.
Chapter seven provides the new flow reduction credits for LID practices when using the Western Washington Hydrologic model.
Finally, several appendices include example specifications, lists of plants appropriate for LID applications, and tables summarizing bioretention and permeable paving research.
For more information about Low Impact Development,
contact Curtis Hinman, 253.798.3257
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