New Development

The Sacramento Stormwater Quality Partnership's New Development program addresses post-construction stormwater quantity and quality from new development and re-development projects. The goal is to protect local creeks and rivers by reducing the discharge of pollutants found in stormwater resulting from new developments to the Maximum Extent Practicable (MEP) and by mitigating increased flows that can cause erosion and degrade habitat.

NEW! FINAL Stormwater Design Manual

The DRAFT of the Sacramento Region Stormwater Quality Design Manual is now available! This edition of the design manual is based on the 2007 Stormwater Quality Design Manual for the Sacramento and South Placer Regions, but has been revised to incorporate hydromodification management and low impact development design standards.

The Stormwater Quality Design Manual for the Sacramento Region, October 2017

Not sure which stormwater quality requirements apply to your project? Check out Table 3-3

Want to know how many LID points you need for your proje ct, or how much volume you need to treat? Please see the revised residential and commercial LID Credits Worksheets! 

Like flow charts? We have one for you: Stormwater Quality Requirements flow chart

Have questions? We are here to help. Please submit questions to Archie Wright (County of Sacramento) at or Dalia Fadl (City of Sacramento) at

Please use this excel table to submit comments.  Comments are due by COB on Tuesday, January 2, 2018.

Sacramento Area Hydrology Model (SAHM)

The Sacramento Area Hydrology Model (SAHM)
was developed by the Sacramento Stormwater Quality Partnership (Partnership) as part of the Hydromodification Management Plan (HMP) project. This tool is intended to assist Engineers in designing BMPs that meet upcoming hydromodification management requirements. The Partnership’s proposed hydromodification management requirements are presented in the revised HMP that was submitted to Central Valley Regional Board for approval in February 2013. It is anticipated that the HMP will be approved in 2014.

Project applicants may use this tool for site planning and evaluation purposes. However, the calculator may not be used for project approval purposes at this time. 

SAHM (latest 2018 version); SAHM User's Manual

Note: The SSQP will be conducting training workshops for the SAHM tool in the near future. If interested in being notified of the training dates, please email Archie Wright (County of Sacramento) at or Dalia Fadl (City of Sacramento) at

2007 Design Manual

Sacramento Stormwater Quality Design Manual – Current technical guidance manual to meet stormwater management requirements in the NPDES permit for new development and re-development priority project

- Priority Project and Stormwater Quality Control Measure Selection Matrix
- Proprietary Stormwater Quality Treatment Devices

Hydromodification Management Plan (HMP) 

Download the Sacramento Stormwater Quality Partnership Hydromodification Managament Plan (revised February 14, 2013).

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