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Interim Hydromodification Criteria
- Draft
County Wide Model SUSMP (.pdf, June 2008)
- Answers
for Common Interim Hydromodification Mangement Criteria
Questions (.pdf, May 2008)
- Using
Continuous Simulation to Size Storm water Control
Facilities (.pdf, May 2008)
- Geomorphic
analysis for interim Hydrograph Modification Plan (HMP)
(.pdf, May 2008)
Click
here for the Interim Hydromodification Criteria
document.
Hydromodification and SUSMP Public Workshop, Model Standard Urban Storm Water Mitigation Plan
(November 2007)
A
Hydromodification and SUSMP Public Workshop was held on November 19, 2007.
Click here to see the Standard Urban Stormwater Management Plan (SUSMP) and Hydromodification Workgroup
page for more information and workshop presentations.
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
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