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)|
|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|
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.