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The South Coast Hydrologic Subregion is composed of three third-level hydrological units. The federally-defined Southern California Coastal water resource subregion equates roughly with the state-designated South Coast hydrologic region. Per a USGS report of 1976, "Water deficiency is prevalent in the South Coastal subregion."
An analysis on historic water quality data from the Borrego Valley Groundwater Basin performed by the U.S. Geological Survey concluded that total dissolved solids (TDS) and nitrate in the upper level of the aquifer exceeded the water-quality thresholds for each given substance (500mg/L and 10 mg/L respectively). [6]
Aquifers of the United States Withdrawal rates from the Ogallala Aquifer.. This is a list of some aquifers in the United States.. Map of major US aquifers by rock type. An aquifer is a geologic formation, a group of formations, or a part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to groundwater wells and springs.
The Laguna–San Diego Coastal water resource basin is a third-level subdivision of the United States hydrologic unit system. [1] The tiers of the classification system, in order from largest to smallest, are regions , subregions, basins (formerly accounting units), subbasins (formerly cataloging units), watersheds, and subwatersheds.
Map of California's interconnected water system, including all eleven reservoirs over 1,000,000 acre-feet (1.2 km 3) as well as selected smaller ones. This is a list of the largest reservoirs, or man-made lakes, in the U.S. state of California.
California groundwater basins, subbasins, and hydrologic regions. The California Department of Water Resources recognizes 10 hydrologic regions and three additional drainage areas within the U.S. state of California. The hydrologic regions are further subdivided into 515 groundwater basins. [1]
Under the Federal Clean Water Act and the state's pioneering Porter-Cologne Water Quality Control Act the State Water Board has regulatory authority for protecting the water quality of nearly 1,600,000 acres (6,500 km 2) of lakes, 1,300,000 acres (5,300 km 2) of bays and estuaries, 211,000 miles (340,000 km) of rivers and streams, and about ...
The Porter-Cologne Act (California Water Code, Section 7) was created in 1969 and is the law that governs water quality regulation in California. The legislation bears the names of legislators Carley V. Porter and Gordon Cologne. [1] It was established to be a program to protect water quality as well as beneficial uses of water.