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Hydraulic Design Basis |
Hydraulic Sizing Method |
| Volume-Based Treatment Measures: Treatment measures whose primary mode of action depends on volume capacity, such as bioretention areas or infiltration structures. |
The volume of annual runoff required to achieve 80% or more capture, determined in accordance with the methodology set forth in Appendix D of the California Stormwater Best Management Practices Handbook (1993), using local rainfall data. |
| Flow-Based Treatment Measures: Treatment measures whose primary mode of action depends on flow capacity, such as swales, sand filters, or vegetated buffer strips. |
The flow of runoff resulting from a rain event equal to at least 0.2 inches per hour intensity (uniform intensity approach). |
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Hydraulic Sizing Criteria Guidance and Design Examples |
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| The full version of the ACCWP C.3 Technical Guidance Manual, including technical guidance on how to design treatment measures, may be downloaded or it may be purchased at the Development Services Center Permit Counter at 39550 Liberty Street,  Fremont, CA 94538.
Every development project is unique and will require different stormwater treatment measures. For more information on stormwater treatment as it relates to your project or site, please call the Environmental Services Division at 510-494-4570. |
