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Show S ubreg ion SUBREGIONS 1 Green River 2 Upper main stem 3 San Juan-Colorado Areas where the volume of recoverable ground water in the upper 100 feet of saturated rocks would be within the limits given below Thousands of acre-feet per square mile 3.2 to 9.6 (Mostly unconsoli- dateo deposits) 1.3 to 3.2 (Mostly volcanic r oc k s) 0.6 to I.3 (Mostly sandstone) 0.3 to 0.6 (Mostly si 1tstone, shale, and 1ime- stone) 0 to 0.3 (Mostly shale and crystal 1ine rocks) The map is based entirely on estimated specific yields of the various rock types in which water occurs. The figures are in- tended only as a convenient index to the relative volumes of ultimately recoverable ground water in storage. Where potential recharge is small, the quantity of recoverable water may be less than that shown; where potential recharge is large, the quantity recoverable may be larger than that shown. Also, the map was compiled without regard to chemical quality of ground water. Determinations of quantity and quality of water that can be developed in any given area can be made only on the basis of more detailed investigations. Additional data in some parts of the basin are obtainable from the district offices of the Water Resources Division, U.S. Geological Survey, in Tucson, Ariz.; Denver, Colo.; Albuquerque, N. Mex.; Salt Lake City, Utah; and Cheyenne, Wyo. Estimated quantity of ground water stored in the upper 100 feet of saturated rocks UPPER COLORADO REGION COMPREHENSIVE FRAMEWORK STUDY Reg i on |