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      Department of Public Works Bureau of Sanitation


"Hillside" refers to property located in an area with known erosive soil conditions, where the development contemplates grading on any natural slope that is 25% or greater and where grading contemplates cut or fill slopes.


  1. Peak Storm Water Runoff Discharge Rate: Post-development peak storm water runoff discharge rates shall not exceed the estimated pre-development rate for developments where the increased peak storm water discharge rate will result in increased potential for downstream erosion.
  2. Conserve Natural Areas
  3. Minimize Storm Water Pollutants of Concern
  4. Protect Slopes and Channels
  5. Provide Storm Drain System Stenciling and Signage (only applicable if a catch basin is built on-site)
  6. Properly Design Outdoor Material Storage Areas (limited application)
  7. Properly Design Trash Storage Areas (limited application)
  8. Provide Proof on Ongoing BMP Maintenance (only applicable if a structural BMP is installed)
  9. Design Standards for Structural or Treatment Control BMPs: Post-construction Treatment Control BMPs are required to incorporate, at a minimum, either a volumetric or flow based treatment control design standard or both, to mitigate (infiltrate, filter, or treat) storm water runoff [only applicable for homes with one acre or more of surface area].


  1. Divert Roof Runoff: Divert roof runoff to vegetated areas before discharge unless the diversion would result in slope instability.
  2. Divert Surface Flow: Divert surface flow to vegetated areas before discharge unless the diversion would result in slope instability.



A complete handbook titled "Development Best Management Practices Handbook, Part B – Planning Activities" describing the above requirements in detail is available here.

Related Internal Links

Main SUSMP Page

Flow Chart of the Plan Review and Approval Process

What to Submit?


Redevelopment Definition

Development BMPs Handbook Part B: Planning Activities

SUSMP Conference

Contact Us

Related External Links

State Water Resources Control Board SUSMP Website