Records of Ground-Water Recharge, Discharge, Water Levels and Chemical Quality of Water for the Edwards Aquifer in the San Antonio Area, Texas, 1934-78

Author Reeves RD, Maclay RW, Grimm KC and Davis MF (US Geological Survey)
Year 1980
Description Title page: Records of Ground-water Recharge and Discharge, 1934-78; Water Levels, 1975-78; and Chemical Quality of Water, 1977-78, for the Edwards Aquifer in the San Antonio Area, Texas. Annual hydrologic report issued by the Edwards Underground Water District.
Report Number Bulletin 38
Publisher Edwards Underground Water District
Location Edwards Aquifer - San Antonio Area
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The average -annual ground- water recharge to the Edwards aquifer in the San Antonio area, Texas, from 1934 through 1978 was 587,200 acre- feet. The recharge in 1978 was 502,500 acre-feet, ending a trend of above average recharge that began i n 1968.  A maximum annual recharge of 1,711,200 acre- feet occurred in 1958, and a minimum annual recharge of 43,700 acre-feet occurred in 1956.

A maximum annual discharge of 960,900 acre- feet occurred in 1977, and a minimum annual discharge of 388,800 acre- feet occurred in 1955. The maximum annual discharge by wells was 431,800 acre- feet in 1978, which is a record high for the 1934-78 period.

Although water levels in wells in the Edwards aquifer showed a general decline in 1978, the volume of ground water in storage in the aquifer was above average.

Analyses of water samples from 72 wells and 3 springs show no evidence of significant degradation of water quality in the Edwards aquifer, and the data show no trend of degradation in water quality.