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II <br />� <br />' <br />' <br />' <br />L_� <br />' <br />� <br />, <br />' <br />1 <br />' <br />' <br />' <br />�J <br />� <br />' <br />1 <br />5.0 DYNAMICS OF GROUND WATER RECHARGE IN SAN LUIS <br />VALLEY <br />5.1 RECHARGE POTENTIAL <br />To obtain an indication of areas within the SLVWCD where ground water recharge can be <br />accomplished most efficiently, numerous runs of a computer ground water model used to <br />simulate changes in ground water levels resulting from surface recharge were made. The <br />computer model was developed by Colorado State University and is called herein the CSU <br />Well&Pit model. As previously explained, the model was developed through research at a <br />recharge site on the eastern side of the San Luis Valley in the Trinchera Creek drainage and is <br />designed to predict ground water changes from a single recharge pit rectangular in nature. <br />Basic input to this computer model include recharge rate based on soil permeability, aquifer <br />transmissivity, specific yield and depth to ground water. The depth to ground water was <br />obtained from a map compiled by U.S.D.I. Bureau of Reclamation. Values for the remaining <br />parameters were obtained for numerous locations from the following published sources: <br />Soil permeability <br />Aquifer transmissivity: <br />U.S.D.A. Soil Conservation Service "Soil Survey of Saguache - <br />Rio Grande and Alamosa County Area, Colorado" (Three <br />publications). <br />Plate 3, "Map Showing Transmissivity of the Unconfined Aquifer, <br />San Luis Valley, Colorado; Colorado Water Resources Circular 18 <br />"Water in the San Luis Valley, South-Central Colorado" by P. A. <br />Emery, R. J. Snipes, J. M. Dumeyer and J. M. Klein, U. S. <br />Geological Survey, 1973. <br />5-1 <br />1 <br />