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Stormwater & Urban Forestry Division
The City of Snoqualmie references the 2021 King County Surface Water Design Manual as its primary guidance document for stormwater design. Additionally, all new development and redevelopment projects in the City of Snoqualmie must follow the stormwater standards from the 2021 City of Snoqualmie Addendum to the 2021 King County Surface Water Design Manual.
This update includes terminology, code, and drainage review guidance, as well as revised water quality, flow control, temporary erosion and sediment control (TESC), and other requirements. Construction and development parties are responsible for determining whether a construction or industrial NOI is required from the Department of Ecology.
The Snoqualmie Addendum lists various amendments to the 2021 King County Surface Water Design Manual regarding water quality treatment requirements. The City will also accept all water quality treatment facility-types identified in the 2019 Ecology Stormwater Management Manual for Western Washington, though emerging technologies are considered on a case-by-case basis provided that the product has received a level of use designation from the Washington Ecology Technical Assessment Protocol Ecology (TAPE) program.
Stormwater Flow Control
Flow control amendments are listed that provide consistency with the 2021 King County Surface Water Design Manual. Refer to the 2021 City of Snoqualmie Addendum for more specific information.
Snoqualmie maintains a robust urban forestry program with 1,051 acres of open space and a tree canopy of 47%, one of the largest in the region. In addition, the city has a street and park tree population of 9,306 trees representing 122 different species, and more than 6,000 street trees lining sidewalks, or about one tree for every two people. It
One aspect of urban forestry is the installation and management of street trees in urban areas, an increasingly popular program across many U.S. cities. As populations grow, higher densities in urban areas are inevitable. Urban forests are an important way to support surrounding ecosystems while minimizing the impact of expanding urban centers.
Urban Forestry Program Benefits
Urban forestry programs across the nation provide cities with many benefits:
- Reduced temperatures by shading streets and buildings
- Lower heating and cooling costs for surrounding buildings
- Reduced levels of pollutants released during high summer temperatures
- Absorption of “greenhouse” gases
- Release of chemicals that support ozone formation
- Wind barriers
- Less water runoff, reducing the changes of erosion flooding
- Shade and cooling for fish-bearing streams
- Protected wildlife habitat
- Improved air quality
- Increased property values
Get involved through the Green Snoqualmie Partnership, which continues the region’s forest legacy and invites people of all ages to get outsides, have fun, and engage in helping restore green spaces.
Plans and Reports
- 2022 Stormwater Management Program Plan (PDF)
- Water Quality Program Annual Report 2021 03 31 Copy of Record (PDF)
- Stormwater Management Program Annual Report 05 11 2020
- Water Quality Program Permit Submittal Electronic Certification
- Stormwater System Operations and Maintenance Manual 2013 (PDF)
- Low Impact Development (LID) Operation and Maintenance Guidance Document 08 08 2013 (PDF)
- Low Impact Development (LID) Code Review Summary Report 03 27 2018 (PDF)
- King County Surface Water Design Manual 2016 (PDF)
- King County Surface Water Design Manual 2016 Addendum (PDF)
- Stormwater Pollutants Best Practices for Metals (PDF)
- 2019 Storm Water Standard Operating Procedures (SOP) Manual (PDF)
- 2012 Stormwater Management Manual for Western Washington (PDF)
- Snoqualmie Urban Forest Strategic Plan Final June 24, 2014 (PDF)