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Notices



  
Video:
Horse and livestock Manure Video - Click here to view the video.

   
 
 

Interim Hydromodification Criteria

Visit the Standard Urban Stormwater Management Plan (SUSMP) and Hydromodification workgroup page to up to date documents.
 
Regional Water Quality Control Board Order R9-2007-0001 Provision D.1.g (6) (Board Order) requires the County of San Diego and its NPDES Co-permittees to identify Interim Hydromodification Criteria (IHC) within 365 days of Order adoption (i.e., by January 24, 2008). The interim criteria will apply until the final Hydrograph Modification Management Plan (HMP) is implemented. The IHC is described in the order as “an interim range of runoff flow rates for which Priority Development Project post-project runoff flow rates and durations shall not exceed pre-project runoff flow rates and durations.” The purpose of the IHC is to prevent development-related changes in stormwater runoff from causing, or further accelerating, stream channel erosion or other adverse impacts to beneficial stream uses. This memorandum provides background on fluvial geomorphology and hydrograph modification management, describes flow control criteria applied in other HMPs, and provides a recommendation for developing the San Diego IHC.
 

San Diego County Low Impact Development (LID) Requirements

PowerPoint Presentations from the February 25 and 27, 2008 LID Workshop.
 
The Final LID Handbook and LID Appendix can be reviewed online at
http://www.sdcdplu.org/dplu/Resource/3~procguid/3~procguid.html#hydro.

 

 
 

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