Find comprehensive services, data and information related to stormwater and non-point source pollution in King County, Washington.
To offer a suggestion or report an error on the King County stormwater services and information website, please contact Fred Bentler, webmaster.
Application of the Design Manual's targeted protection levels is determined from the following three application maps of King County. The maps are available here to view or download. To view the Adobe Acrobat maps you need Acrobat Reader, Version 3.0 or later, which is FREE. This format was chosen to allow the user to zoom in and out, pan the map in any direction, and print the map at the best resolution possible. Click the icon below if you need the Adobe Reader.
King County Runoff Time Series (KCRTS) Model Program
The KCRTS model is a required methodology under the 1998 and 2005 King County Surface Water Design Manual for sizing detention and infiltration flow control facilities. The program and software reference manual may be purchased for $50. For KCRTS software reference manuals purchased prior to 1999, an upgrade package is available for $25. The software package includes the King County Backwater (KCBW) program. Tax and shipping charges will be applied as applicable. For information on purchasing software or documents contact Document sales at (206) 296-6519.
Download the software patch for the KCRTS Software Version 6.0
This self-extracting software patch must be applied to King County Runoff Time Series (KCRTS) model software that is already loaded on your computer. Requires version 4.40g, or later, currently installed. This upgrade fixes the items indicated in the 10/24/06 Bug Report .
King County Runoff Time Series Model Software - Online Documentation
Pond volume calculation spreadsheet
This Excel spreadsheet can be used to estimate pond volumes for typical land cover conversions on till soils.
Please review the frequently asked questions and responses before contacting the Water and Land Resources Division for technical support.
For help with the KCRTS program, please call the Drainage Complaint/Information Line (206) 296-1900.
Sea-Tac full historical runoff files
For more information, view the Sea-Tac Read me file before downloading.
Landsburg full historical runoff files
For more information, view the Landsburg Read me file before downloading.
Sea-Tac historical precipitation
For more information, view the Sea-Tac Precipitation Read me file before downloading.
Landsburg historical precipitation
For more information, view the Landsburg Precipitation Read me file before downloading.
King County Backwater Software version 6.0
The KCBW program is bundled with KCRTS on the blue, light green and now a gold CD-ROM. The software patch update may also be downloaded separately below. The KCBW program documentation is included with the KCRTS software reference manual and online. People with KCRTS software reference manuals dated prior to 1/1/99 may purchase an upgrade package for $25-. Tax and shipping charges will be applied as applicable. For information on purchasing, contact Document Sales at 206-296-6519.
Download the software patch to King County Backwater Software version 6.0
For more information, view the Backwater Read me file before downloading.
Software patch WKCBW.EXE (355k)
King County Backwater Software documentation
These are the software documents.