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Development of ground-water resources in the Orange County area, Texas and Louisiana, 1980-Spring of 1985

Water-Resources Investigations Report 87-4158

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Abstract

This report updates groundwater information pertaining to the lower unit of the Chicot aquifer in the Orange County area, Texas and Louisiana. The period of data collection was from 1980 to the spring of 1985. Some data collected prior to 1980 are presented to establish long-term trends and relations. The lower unit of the Chicot aquifer is the main source of freshwater for several cities, communities, industries, housing subdivisions, and individual homeowners in Orange County. The total pumpage from the lower unit of the Chicot aquifer in Orange County decreased from a historical maximum of 23.1 million gallons per day during 1984. The use of surface water decreased from a peak withdrawal of 58.1 million gallons per day during 1981 to 41.4 million gallons per day during 1984. Water levels rose throughout most of the area. The greatest rise in water levels (as much as 14 feet) occurred in and near the city of Orange, although the greatest decline (3 feet) occurred northwest of Vidor. Most of the water in the lower unit of the Chicot aquifer is fresh, but the water quality can vary greatly within short distances. Chloride concentrations during 1980-84 ranged from 10 to 1,700 milligrams per liter. In general, chloride concentrations remained constant during 1980-84. A relation exists between chloride concentrations and specific conductance. It was determined that, estimated chloride concentrations (milligrams per liter) generally can be approximately determined by multiplying 0.29 times specific-conductance values (microsiemens per centimeter at 25 degrees Celsius by 0.29) when the specific conductance is between 500 and 5,600 microsiemens per centimeter at 25 degrees Celsius. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Development of ground-water resources in the Orange County area, Texas and Louisiana, 1980-Spring of 1985
Series title:
Water-Resources Investigations Report
Series number:
87-4158
Edition:
-
Year Published:
1987
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
vi, 50 p. :ill., maps ;28 cm.