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001585 REGIONAL PROJECT TITLE: Hydrology of the High Plains Regional Aquifer System (fig. 13) COOPERATING AGENCY: None PROJECT CH I EF: Ronald G. Borman, Subdistrict Office, Lakewood PERIOD OF PROJECT: October 1977 to September 1982 Problem. --Hater Nebra ska, ~Iew Mex i co, from the Ogallala the aquifer. In some may limit continued more than 100 gallons levels are declining in many areas of Colorado, Kansas, Oklahoma, South Oakota, Texas, and Wyomin9 because pumpage aquifer, principally for irrigation, is exceeding recharge to areas, including Colorado, the magnitude of the decl ines use of the aquifer as a source of supply for wells yielding per minute of water. Objeotive.--Develop a computer model of the entire aquifer system that can be used to evaluate long-term effects of various water-management alternatives. AppFoaoh.--Expand and refine the present data base in Colorado by collecting and analyzing additional water-level, well-yield, and water-quality data, espe- cially for areas north of the South Platte River and south of the Arkansas River. Prepare maps showing hydrogeologic characteristics of the aquifer system. PFogress.--Data collection has begun. About 2,500 wells have been invento- ried; discharge was measured from about 100 wells. Maps showing bedrock topography and geology and the altitude and configuration of the water table during 1975 have been completed. Hater levels were measured in about 650 wel Is from January to Ma rch 1980. Plans.--Continue measuring water levels in about 650 wells. servation-well network to provide better coverage. Continue data ate model development, and begin preparation of a report. Modify the ob- analysis, initi- 35