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<br /> <br />~, . <br /> <br />Pleistocene-Ogallala aquifers are the most commonly used <br />sources of ground water because, as shown in figure 2-4, they <br /> <br />have the greatest areal extent of the water-bearing formations <br />in the basin and the chemical quality of their water usually is <br />suitable for most purposes. Because these aquifers are the shal- <br />lowest water-bearing formations, the cost of well drilling is <br />less than it would be in deeper formations and they generally <br />yield more water to wells than any of the other water-bearing <br />formations in the basin. <br /> <br />~ <br />When no Pleistocene-Ogallala aquifers are present or where <br />they are thin or nearly impervious, wells can usually be completed <br />in other water-bearing formations. Figure 2-5 shows the approxi- <br /> <br />mate areas where formations other than the Pleistocene deposits <br /> <br />and the Ogallala Formation may be used as alternate sources of <br /> <br />ground water. <br /> <br />2-6 <br />