Although published well-test results are lacking, the Hays area possesses a remarkable amount of subsurface data in the form of driller's logs. Private wells are abundant throughout the area of this study, logs of which were assembled by RSKERC staff, and summarized (through 1985) by <.Bermudez 1986.>, and added to the RSKERC Hays well databaseAdditional published data was derived from a USGS drilling effort, undertaken to improve water supplies at a local Army Air Force base during World War II [.Latta 1948.]. An unpublished consulting report also described efforts in the early 1970's to explore the Big Creek aquifer at greater distances from Hays [.Nuzman 1974.].
A problem in interpreting these data sources is that the sand-gravel aquifer tends to form the basal Quaternary deposits in the valley, and driller's logs tend to neglect isolated sand-gravel bodies above the main aquifer, as well as silt-clay zones within the aquifer. This tendency represents an unresolvable bias in the data, and therefore in the results described below.