Experience has shown this recharge rate to be approximately correct for the Wichita well-field area of Harvey County (Stramel, 1956). 129) estimated the net average recharge in the Arkansas Valley to be about 20 percent of the annual precipitation or about 320 acre-feet per square mile per year in years of normal precipitation. Ultimately, the perennial field will depend on the average annual recharge. This volume of water does not represent the amount that could ultimately be withdrawn from the area, but rather a reserve that could be regulated to provide a perennial yield without progressive depletion of storage if other hydrologic factors affecting the aquifer are known. The quantity of ground water in storage within the sediments of the valley is about 6.1 million acre-feet if an assumed specific yield of 20 percent for the sediments is correct. The Arkansas River valley contains most of the usable ground water in the County, and most of the large ground-water supplies are obtained from this area. 2)., the sand and gravel beds containing most of the ground water are interconnected, and the complete sequence of silt, clay, sand, and gravel beds responds to long-term withdrawals of water as a singe aquifer. Although the deposits are stratified and lenticular (Pl. The area is underlain by alluvial sediments of Pliocene to Recent age that are the most productive water-bearing rocks in the County. The Arkansas Valley is characterized by its extreme flatness and the poorly developed surface drainage of the land flanking the Arkansas River. Where ground-water conditions are not uniform within an area, it has been divided into subareas.įigure 20-Map of Sedgwick County, Kansas, showing generalized ground-water areas and subareas. There are four major ground-water areas: the Arkansas Valley, the Ninnescah Valley, the Wellington Upland, and the Ninnescah-Wellington Upland. Generalized ground-water areas and subareas within the County are shown on Figure 20 and are explained in the section of the report that follows. Ground Water, continued Ground-water Areas
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