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000243 . William R. Smith May 1, 1979 Page -2- In addition, information will be provided showing irrigated acreage in study area's subregions. The proposed subregions, based on geologic and hydrologic parameters will be integrated with the states of Nebraska, Kansas, and Oklahoma (if pertinent). Description of Research Element task A-3.1. Data on the bedrock structure, geology of the Ogallala and White River aquifer for the Colorado Northern High Plains (sub- regions 1-5) and of the Ogallala Dakota, Cheyenne, and Dockum aquifer for the Colorado Southern High Plains (subregion 6) is available at the Division of Water Resources. Information on precipitation, streamflow, and recharge will be compiled from existing records either in the Division office or in Management District Offices in these High Plains area, Ground water movement, natural discharge, and pertinent aquifer characteristics, transmissivity, specific yield, porosity, thicknesses, and historic water levels are available. This data will be assimilated and, where necessary, coded for computer input to the CSU system 2000. Vie 11 data now in the Central ADP sys tem wi 11 be transferred to the CSU system to provide a concise data bank from which to gener- ate i nformat i on and output for the other element tasks. It is planned to set-up a grid network for the computer input of the data with nodes on a two-township spacing. This will provide a ni ne x sixteen network for the Northern Hi gh Pl a ins (subregi ons 1-5) and a fi ve x seven network fOt' the Southern Hi gh Pl a ins (subregion 6). Data provided at each point will be: 1, Elevation of bedrock 2. Elevation of water table 3, Historic water level declines 4. Specific yield of aquifer 5. Average irrigated acreage in vicinity 6. Number of wells in affected area 7, Precipitation, recharge, and return flows Element task A-3.2 Six subregions based on geologic (bedrock) configuration aquifer characteristics, and ground water movement have been established. These are depicted on the attached map.