Summary of hydrologic data for the San Gabriel River basin and Edwards Aquifer, Georgetown area, Texas, water year 1990

The Edwards aquifer is the principal source of freshwater for municipal, domestic, and industrial users in the Georgetown area.  Other sources of freshwater are Lake Georgetown and the streams draining the San Gabriel River basin.  Lake Georgetown, located on the North Fork San Gabriel River west of Georgetown, is a freshwater supply for some municipalities in the area.  Water in the San Gabriel River basin also suppliesa variety of needs east of Georgetown.  Because of the importance of the Edwards aquifer and the surface waters as a source of freshwater in the area, the U.S. Geological Survey, in cooperation with the city of Georgetown, established a local streamflow and ground-water monitoring network in principal streams and teh Edwards aquifer, and conducted surveys of the network in water years 1987, 1988, and 1990.  The study area was centered on Georgetown and emcompassed an area of about 150 mi² (fig. 1).