Geohydrology of the Anza-Terwilliger Area, Riverside County, California

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Description

The Anza-Terwilliger area consists of about 96 square miles (24-9 square kilometers) in the upper parts of the Santa Margarita River and Coyote Creek drainage basins in Riverside County, Calif., about 90 miles (145 kilometers) southeast of Los Angeles. This report deals with geology, steady state and transient state of ground water, net depletion of ground water, surface-water flow, precipitation, chemistry of water, land and water use, and gravity data for the Anza-Terwilliger area. The data indicate that the rate of ground-water depletion ha's accelerated since 1950. Pumping depressions adjacent to the Cahuilla Indian Reservation have increased the hydraulic gradient ... continued below

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30 p. : ill. ; 28 cm.

Creation Information

Moyle, W. R., Jr. March 1976.

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Description

The Anza-Terwilliger area consists of about 96 square miles (24-9 square kilometers) in the upper parts of the Santa Margarita River and Coyote Creek drainage basins in Riverside County, Calif., about 90 miles (145 kilometers) southeast of Los Angeles. This report deals with geology, steady state and transient state of ground water, net depletion of ground water, surface-water flow, precipitation, chemistry of water, land and water use, and gravity data for the Anza-Terwilliger area. The data indicate that the rate of ground-water depletion ha's accelerated since 1950. Pumping depressions adjacent to the Cahuilla Indian Reservation have increased the hydraulic
gradient and are.causing water beneath the reservation to flow toward these depressions. Total depletion of ground water since 1950 is about 14,000 acre-feet (17.3 cubic hectometers). Chemical analyses indicate that the ground water in local areas contains
concentrations of nitrate above that recommended by the Environmental Protection Agency for human consumption.

Physical Description

30 p. : ill. ; 28 cm.

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Technical Report Archive and Image Library

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Creation Date

  • March 1976

Added to The UNT Digital Library

  • April 27, 2017, 7:35 p.m.

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  • Nov. 29, 2017, 1:16 p.m.

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Moyle, W. R., Jr. Geohydrology of the Anza-Terwilliger Area, Riverside County, California, report, March 1976; United States. (https://digital.library.unt.edu/ark:/67531/metadc968332/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.