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Method of estimating natural recharge to the Edwards Aquifer in the San Antonio area, Texas

Water-Resources Investigations Report 78-10

Prepared in cooperation with the Texas Department of Water Resources, the Edwards Underground Water District, and the city of San Antonio
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Abstract

The method of estimating annual recharge is based on data collected from a network of stream-gaging stations and on assumptions related to applying the runoff characteristics from gaged areas to ungaged areas. The basic approach is a water-balance equation, in which recharge within a stream basin is the difference between measured streamflow above and below the infiltration area of the aquifer plus the estimated runoff in the zone that includes the infiltration area. Recharge in the Medina River basin also includes seepage losses from Medina Lake and Diversion Reservoir.

The principal errors in the estimates of annual recharge are related to errors in estimating runoff in ungaged areas, which represent about 30 percent of the infiltration area. The estimated long-term average annual recharge in each basin, however, is probably representative of the actual recharge because the averaging procedure tends to cancel out the major errors.

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Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Method of estimating natural recharge to the Edwards Aquifer in the San Antonio area, Texas
Series title:
Water-Resources Investigations Report
Series number:
78-10
Year Published:
1978
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Austin, TX
Contributing office(s):
Texas Water Science Center
Description:
iv, 34 p.
Country:
United States
State:
Texas
City:
San Antonio
Other Geospatial:
Edwards Aquifer
Online Only (Y/N):
N
Additional Online Files (Y/N):
N