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Low
Impact Development Technical Guidance Manual for Puget Sound
The
purpose of the low impact technical
guidance manual (5.2 mb) is to provide stormwater managers and
site designers with a 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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