Consolidating benthal deposits
The principal source of water for all uses is from unconsolidated alluvial deposits that underlie most of the area.
The test drilling was done with auger and hydraulic rotary rigs operated by the Kansas Geological Survey.In 1940, there were about 30 municipal and industrial wells and 50 irrigation wells in the area.In 1973, there were about 200 municipal and industrial wells and 950 irrigation wells; and in 1974, about 1,160 irrigation wells.Annual withdrawals of ground water by wells increased from about 5,000 acre-feet in 1940 to about 140,000 acre-feet in 1974.The steadily increasing withdrawal rate has not produced long-term declines of water levels that may be distinguished from the effects of climatic changes.In this system, the first set of digits of a well number indicates the township; the second set, the range east or west of the sixth principal meridian; and the third set, the section. For readers interested in the metric system, the English units of measurement given ill this report are listed below in equivalent metric units using the following abbreviations and conversion factors: The land surface of the report area is an undulating plain with little relief.
The first letter after the section number denotes the quarter section or the 160-acre tract; the second, the quarter-quarter section or the 40-acre tract; and the third, the quarter-quarter-quarter section or the 10-acre tract. The topography grades southward from sand dunes along the Arkansas River to a loess-covered upland that is terminated on the south and southeast by deeply eroded valleys.
Significant additional development for irrigation that could cause ground-water withdrawal to exceed longterm recharge and result in water-level declines is anticipated in some areas.
The average annual recharge rate to ground water from precipitation is estimated to be about 2 inches.
The purpose of this study was to combine data from previous studies and other records with current information obtained in the area, to evaluate the ground-water resources of the area with respect to future development, and to make recommendations as to the needs for future studies. Support for the study was provided by the Division of Water Resources of the Kansas State Board of Agriculture and the Division of Environment of the Kansas Department of Health and Environment.
This study began in 1972 as part of a cooperative program of ground-water investigations between the Kansas Geological Survey and the U. The Great Bend Prairie consists of a 5,400-square-mile area south of the Arkansas River (lat 37° 23' to 38° 22' N., long 97° 40' to 99° 35' E.) in south-central Kansas, as shown on figure 1.
The chemical quality of ground water from unconsolidated deposits in the western half of the area is generally suitable for most uses.