The Edwards aquifer is the primary source of potable water for the San Antonio area in south-central Texas. The Knippa Gap was postulated to channel or restrict flow in the Edwards aquifer in eastern Uvalde County, and its existence was based on a seri
Clark, Allan K. akclark@usgs.gov,Pedraza, Diana E. dpedraza@usgs.gov,Morris, Robert R.. Geologic framework, structure, and hydrogeologic characteristics of the Knippa Gap area in eastern Uvalde and western Medina Counties, Texas. 2013-01-01.