DEFINITION
"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.
GENERAL REQUIREMENTS 
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1.
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Conserve Existing Landscape and Natural Areas. |
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2.
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Protect Existing Slopes and Drainage Devices. |
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Divert Roof Runoff and Surface Flow to Vegetated Areas before discharge into the Storm Drain System if the diverted flow will not result in slope instability. |
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Design Standards for Structural or Treatment Control BMPs:
Post-construction treatment control BMPs are required to incorporate, at minimum, either a volumetric or flow based treatment control design standard or both, to mitigate (infiltrate, filter or treat) storm water runoff for single-family hillside residential developments with one acre or more of surface area. |
SPECIFIC REQUIREMENTS
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1.
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Divert Roof Runoff:
Direct runoff from roof gutters and down spouts to planter areas. |
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2.
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Divert Surface Flow:
Direct slope surface flow to vegetated areas or areas with permeable paving. |
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3.
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Overflow
Provide overflow drainage devices at all areas (landscape planters, permeable pavements, etc) that receive storm water runoff in order to conduct overflow drainage to the street in non-erosive devices, as required by Chapter 70 of the Los Angeles City Building Code. |
OTHER CATEGORIES
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.
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