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Construction and Post-Construction Stormwater Management for New Development and Redevelopment

City of Wenatchee Stormwater Construction & Post-Construction Code Update
The Eastern Washington Phase II Municipal Stormwater Permit requires that new development and redevelopment projects begin retaining stormwater runoff generated on-site for, at a minimum, the 10-year, 24-hour rainfall event no later than December 31, 2017.  The intent of the requirement was to further the implementation of low impact development.  This approach to land development emphasizes natural landscape preservation and the implementation of stormwater best management practices that mimic the natural infiltration and dispersion of stormwater on an undeveloped site.  With regards to stormwater pollution prevention, on-site stormwater retention reduces the opportunity for stormwater runoff to pick up pollutants and carry them into rivers and streams.  The city’s municipal stormwater system carries runoff to the Columbia River, Wenatchee River, Squilchuck Creek, and the No. 1 Canyon, No. 2 Canyon, and Dry Gulch Drain ways. 

To comply with the permit requirements for on-site stormwater retention, city council recently adopted revisions to Wenatchee City Code Chapter 12.10 (Please use the link below to view the document).  In addition to the changes for permit compliance, city staff attempted to improve the readability of the code as well as consistency with the Stormwater Management Manual for Eastern Washington and Chelan County stormwater regulations.  The enforcement section of the code was also re-written to be consistent with the City’s utility code enforcement for the water and sewer utilities.

Update of the Eastern Washington Stormwater Management Manual
The Wenatchee Valley Stormwater Technical Advisory Committee hosted two meetings to discuss the current Department of Ecology update of the Stormwater Management Manual for Eastern Washington.  Comments were collected and submitted to the Department of Ecology on behalf of local designers, engineers and interested parties.  Please click here to view the letter and comments that were sent to the Department of Ecology.  The final draft of the manual is expected to be out for review in November.

If you have any questions or comments, contact Tom Wachholder at twachholder@east-wenatchee.com or (509)884-1829. 

For more information on the Ecology update of the stormwater manual please click here to visit the Department of Ecology's website.

Construction: 
Construction Site Stormwater Runoff Control is Appendix D in the Wenatchee Valley Stormwater Management Program.  It was written as a regional template, so each jurisdiction could customize it with the specifics of their system.

Post-Construction:
Post-Construction Stormwater Management for New Development and Redevelopment is Appendix E in the Wenatchee Valley Stormwater Management Program.  It was written as a regional template, so each jurisdiction could customize it with the specific of their system.

Construction and Post-Construction Ordinances
The following ordinances were adopted in February 2010 and went into effect by the February 2011 deadline.  For more information, contact your local member of the WVSTAC.

The following resolutions were approved in Chelan County in February 2010 and went into effect by the February 2011 deadline.

Construction and Post-Construction Links and Documents:

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