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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