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Originally published in 1978 as Kansas Geological Survey Irrigation Series 4.
This publication is also available as an Acrobat PDF file (1.1 MB). A dependable supply of suitable quality ground water is an increasingly important factor in the economic growth of the Great Bend Prairie area.
It is estimated that 45 million acre-feet of ground water are in storage in the unconsolidated deposits.
However, only about 60 percent of this water may be usable because of insufficient saturated thickness or excessively high mineralization in local areas.
The work consisted of (1) making an inventory of about 1,500 wells, (2) measuring the water level in a network of about 290 wells, (3) measuring the discharge and rate of fuel consumption for 53 randomly sampled irrigation wells, (4) collecting about 150 ground-water samples for chemical analysis, (5) determining the flow-duration curves of 20 small streams in the area, (6) analyzing about 2,000 logs of oil, gas, and water tests to prepare maps of the geology of the bedrock and the altitude and configuration of the bedrock surface, and (7) evaluating the hydrologic properties of the unconsolidated aquifer.
The test drilling was done with auger and hydraulic rotary rigs operated by the Kansas Geological Survey.
The chemical quality of ground water in the western half of the area generally is suitable for most uses.
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.
In the eastern half of the area, the quality may be unsuitable locally as a result of upward leakage of highly mineralized water from underlying Permian rocks.
A continuing program of monitoring changes in water levels and water quality is needed for assessing future problems and planning appropriate management.