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100 KILOMETERS Figure 50 100 KILOMETERS Alhers Equal-Area projection amount of water approaches to ground-water AQUIFER BOUNDARY Base Base from U.S. Base of aquifer central meridian 101 changes in water Colorado County courtesy of R.R. Datum depletion discharge doctrine feet of water-level geohydrologic geologic units Geological Survey digital ground water Ground-Water Conservation Districts ground-water management ground-water-management High Plains aquifer High Plains Designated irrigation Land surface landowners large-capacity locations Mexico million acre-feet Nebraska NGVD 29 Oklahoma Water Resources overlie the High overlies the aquifer OWRB percent Photograph courtesy PLAINS AQUIFER BOUNDARY Plains Designated Basin predevelopment period predevelopment saturated thickness predevelopment to 2000 prior appropriation doctrine pumpage pumping recharge rule of capture sand saturated zone siltstone South Dakota Southern High Plains Standard parallels 29 Survey digital data Texas U.S. Department U.S. Geological Survey volume of water water in storage Water Resources Board water rights water table water-level declines