Project Clean Water

A Water Quality Resource for the San Diego Region

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San Diego Model SUSMP and HMP

The Stormwater Copermittee Land Development Workgroup is responsible for the development and update of the Countywide Model Standard Urban Stormwater Management Plan (SUSMP) and Hydromodification Management Plan (HMP), as well as related tools and resources.  Workgroup information can be found here.

Final Countywide Model SUSMP

Appendix A - Stormwater Pollutant Sources/Source Control Checklist

Appendix B - Final Hydromodification Management Plan (HMP)



BMP Sizing Spreadsheet Version 1.04 (Posted March 28, 2014, revised October 9, 2014)

The BMP Sizing Calculator has been taken down effective June 30, 2014. A new, more intuitive and easier to use BMP Sizing Spreadsheet is now available for download.

The user’s guide provides instructions on how to use the BMP Sizing Spreadsheet.

For additional information contact the jurisdiction your project is located in.


• This BMP Sizing Spreadsheet is a tool offered to assist the public with permit compliance, but its use is not intended to guarantee or warrant compliance, which is the independent responsibility of the user. In no event will the San Diego area municipal Copermittees be liable for any incidental, special or consequential damages of any kind (including, but not limited to, loss of information or other monetary loss) arising in any way in connection with the use or inability to use the BMP Sizing Calculator accessed from this website.

San Diego BMP Sizing Calculator Methodology


Wet Basins

Biorentention Facilities

Dry Wells

Planter Boxes



SDHM 3.0 User Workshop Morning Session May 2016

SDHM 3.0 User Workshop Afternoon Session May 2016

City of San Diego Hydromodification Workshop

APWA SCCWRP/CSU Hydromodification Screening Tool Training - June 2012

APWA BMP Sizing Calculator Training - March 2011

APWA BMP Sizing Calculator Example Problems - March 2011

APWA Sponsored SUSMP Training - March 2010

San Diego Regional Model SUSMP Process Overview

Low Impact Development What it is and What it does

Stormwater Treatment Requirements for New Developments

Review of the Model SUSMP

Using the LID Design Guide to Prepare and Review Project Submittals

Exercise: Using the Model SUSMP LID Design Guide and Example 1d3 slide

Avoiding Common Errors in LID Design and Construction

HMP and LID Sizing Calculator for the San Diego Region

APWA HSPF Model Training - June 2009

Status of San Diego’s Local Hydromodification Management Plan (HMP) Planning

Developing Tools for Hydromodification Management and Assessment Update

Review of the Model SUSMP

Integrating Hydromodification Management Into the SUSMP

Using LID to Meet NPDES Treatment and Hydromodification Requirements

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