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Changes in water levels in the High Plains aquifer underlying parts of South Dakota, Wyoming, Nebraska, Colorado, Kansas, New Mexico, Oklahoma, and Texas are caused by interacting changes in precipitation, land use, and annual pumpage. Water levels declined from the time aquifer development began until 1980 throughout parts of the High Plains of Nebraska, Colorado, Kansas, New Mexico, Oklahoma, and Texas. From 1980 through 1987, water-level changes were mixed, with declines of 10 feet to greater than 25 feet in the highly developed areas of Kansas, New Mexico, Oklahoma and Texas and almost stable to rising water levels throughout the remaining area of the aquifer. The net change was a rise of 0.8 foot. Precipitation generally was greater than normal during 1981-87; therefore, pumping for irrigated agriculture decreased. Water-level changes also were mixed during 1987. Water-level declines continued in some highly developed areas, but water levels generally rose throughout most of the aquifer. The average area-weighted change was a rise of 0.28 foot. This rise was due to the generally greater than normal precipitation, a decrease in irrigated acreage, and a decrease in pumpage for those areas irrigated. At the end of the 1988 growing season the drought in the Midwest affected only limited areas of the High Plains. The effects of the drought on water levels in the High Plains aquifer can not be assessed until the water-level measurements for the nonirrigation season of 1988-89 are compiled. The changes in water levels in the High Plains aquifer from 1980 to 1988 are presented in a map for the entire area, and water-level changes from 1987 to 1988 are shown in individual state maps. The maps were compiled from data obtained from U.S. Geological Survey and State agency data files. Trends in water levels are discussed in relation to precipitation trends and trends of acres irrigated by ground water.

water-resources investigations report

Water-level changes in the High Plains aquifer underlying parts of South Dakota, Wyoming, Nebraska, Colorado, Kansas, New Mexico, Oklahoma, and Texas: Predevelopment through nonirrigation season 1987-88