"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.
- 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.
- Conserve Natural Areas
- Minimize Storm Water Pollutants of Concern
- Protect Slopes and Channels
- Provide Storm Drain System Stenciling and Signage (only applicable if a catch basin is built on-site)
- Properly Design Outdoor Material Storage Areas (limited application)
- Properly Design Trash Storage Areas (limited application)
- Provide Proof on Ongoing BMP Maintenance (only applicable if a structural BMP is installed)
- 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].
- Divert Roof Runoff: Divert roof runoff to vegetated areas before discharge unless the diversion would result in slope instability.
- Divert Surface Flow: Divert surface flow to vegetated areas before discharge unless the diversion would result in slope instability.
FOR ADDITIONAL INFORMATION
A complete handbook titled "Development Best Management Practices Handbook, Part B – Planning Activities" describing the above requirements in detail is available here.