Unified Interior Regions

This report is based on an investigation by the United States Geological Survey, the Texas State Board of Water Engineers, and the Texas State Board of Health to determine the ground-water resources of Uvalde and Medina Counties, especially in relation to irrigation, both in these counties and in the counties to the south where water is obtained...

The water discharged from the large springs of San Antonio and most of the deep wells of the San Antonio area comes from a common reservoir in fissures and solution channels in the Edwards limestone. The water enters the limestone in a zone of outcrop along the Balcones escarpment, which crosses the northern parts of Bexar and Medina Counties and...

Somervell County is part of the Grand Prairie region of north-central Texas. An excellent supply of artesian water is available from the Trinity reservoir at no great depth. The first flowing well in Somervell County was drilled in 1880, and the first flowing well in Glen Rose, the county seat, was drilled in 1881. Since 1880 more than 500 wells...

Heavy rainfall over a large area in south-central Texas from September 8 to September 10, 1921, produced great floods which caused the loss of at least 224 lives and damage to property amounting to more than $10,000,000. The most destructive flood in Texas prior to 1921 occurred in December, 1913. That flood, which is described on pages 46-47,...