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The design of storm drains by City forces for the Los Angeles County Flood Control District or the State Division of Highways is not included in this manual Resources. Below are valuable resources for the County Stormwater Quality Program County of Los Angeles ICID Elimination Program Manual Home · water issues · programs · stormwater · municipal · losangeles. Los Angeles County MS4 Permit. New! Modification of the Los Angeles County MS4 Permit pollutants in storm water runoff from construction sites to the MS4. LA County MS4 Permit, inspections of construction. Stormwater Engineering Data Products page. We provide information for your Hydrologic report, Hydrology Manual, rainfall data, dams, reservoir data, Lessen the adverse impacts of stormwater runoff from development and urban runoff on natural drainage systems, receiving waters and other water bodies. B.