Subwatersheds 12-digit Hydrologic Unit Code (HUC) Watershed Boundary Dataset (WBD) for Orange County, California. The intent of defining Hydrologic Units (HU) within the Watershed Boundary Dataset is
The Watershed and Subwatershed hydrologic unit boundaries provide a uniquely identified and uniform method of subdividing large drainage areas. The smaller sized 6th level sub-watersheds (up to 250,00
