Hydrogeologic aspects of the Knippa Gap area in eastern Uvalde and western Medina counties, Texas
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Abstract
The Edwards aquifer is the primary source of potable water for the San Antonio area in south-central Texas. The Knippa Gap area is a structural low (trough) postulated to channel or restrict flow in the Edwards aquifer in eastern Uvalde and western Medina Counties, Tex. To better understand the function of the Knippa Gap, the U.S. Geological Survey, in cooperation with the U.S. Army Corps of Engineers, developed the first detailed surficial geologic map of the Knippa Gap area with data and information obtained from previous investigations and field observations. A simplified version of the detailed geologic map depicting the hydrologic units, faulting, and structural dips of the Knippa Gap area is provided in this fact sheet. The map shows that groundwater flow in the Edwards aquifer is influenced by the Balcones Fault Zone, a structurally complex area of the aquifer that contains relay ramps that have formed in extensional fault systems and allowed for deformational changes along fault blocks. Faulting in southeast Uvalde and southwest Medina Counties has produced relay-ramp structures that dip downgradient to the structural low (trough) of the Knippa Gap.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Hydrogeologic aspects of the Knippa Gap area in eastern Uvalde and western Medina counties, Texas |
| Series title | Fact Sheet |
| Series number | 2014-3045 |
| DOI | 10.3133/fs20143045 |
| Year Published | 2014 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Texas Water Science Center |
| Description | 6 p. |
| Country | United States |
| State | Texas |
| County | Medina County, Uvalde County |
| Other Geospatial | Knippa Gap |
| Datum | North American Datum of 1983 |
| Projection | Universal Transverse Mercator projection |
| Scale | 250000 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |