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Much of this data was digitized from historical drainage study maps. To learn more about MS4 outfalls and corresponding stormwater catchment areas, please visit the NPDES site, hosted by the United States Environmental Protection Agency.Principle Attributes:AREA_NAME: These areas roughly coincide with Hydrologic Unit Codes (HUCs) as identified by the United States Geological Survey.OUTFALL_ID: Corresponds to a proposed MS4 outfall point identifier.This data is a work in progress. To obtain the most recent download, visit the Los Angeles County GIS Data Portal. |