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      Department of Public Works Bureau of Sanitation

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

1.
Conserve Existing Landscape and Natural Areas.
2.
Protect Existing Slopes and Drainage Devices.
3.
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.
4.
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

1.
Divert Roof Runoff:
Direct runoff from roof gutters and down spouts to planter areas.
2.
Divert Surface Flow:
Direct slope surface flow to vegetated areas or areas with permeable paving.
3.
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.

Related Internal Links

Main SUSMP Page

SUSMP Infiltration Requirements and Guidelines [pdf 49kb]

Flow Chart of the Plan Review and Approval Process

What to Submit?

SUSMP Fees [PDF 143Kb]

Forms

Redevelopment Definition

Development BMPs Handbook Part B: Planning Activities

SUSMP Conference

Contact Us


Related External Links

State Water Resources Control Board SUSMP Website