Description: The boundaries of the 9 California Regional Water Quality Control Boards are derived from watershed boundaries in the The California Watershed Map (CALWATER version 2.2). Calwater 2.2 is a set of standardized watershed boundaries meeting standardized delineation criteria.
Service Item Id: 3cb84792a05c4f1da31863aa98ca4fb3
Copyright Text: California State Water Resource Control Board, Tierra Data Systems
Description: The Municipal Storm Water Permitting Program regulates storm water discharges from municipal separate storm sewer systems (MS4s). Municipal or urban areas commonly include large impervious surfaces which contribute to an increase in stormwater runoff. On April 30, 2003 as part of Phase II, the State Water Resources Control Board issued a General Permit for the Discharge of Storm Water from Small MS4s (WQ Order No. 2003-0005-DWQ) to provide permit coverage for smaller municipalities (population less than 100,000), including non-traditional Small MS4s, which are facilities such as military bases, public campuses, prison and hospital complexes.
Description: The Municipal Storm Water Permitting Program regulates storm water discharges from municipal separate storm sewer systems (MS4s). Municipal or urban areas commonly include large impervious surfaces which contribute to an increase in stormwater runoff. Under Phase I, which started in 1990, the Regional Water Quality Control Boards have adopted National Pollutant Discharge Elimination System General Permit (NPDES) storm water permits for medium (serving between 100,000 and 250,000 people) and large (serving 250,000 people) municipalities.
Description: The DISTRICT feature class is a polygon coverage representing the California Department of Transportation (Caltrans) district boundaries. There are 12 Caltrans Districts in California.
Description: The boundaries of the 9 California Regional Water Quality Control Boards are derived from watershed boundaries in the The California Watershed Map (CALWATER version 2.2). Calwater 2.2 is a set of standardized watershed boundaries meeting standardized delineation criteria.
Service Item Id: 3cb84792a05c4f1da31863aa98ca4fb3
Copyright Text: California State Water Resource Control Board, Tierra Data Systems