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I" f,<: f:.., 'I ,~' ~ " Platte (GASP) all participated in the original study (5). A finite difference model was used to determine the change in groundwater storage resulting from the recharge operations and the recharge credlt to the river. The recharge project demonstrated that it is economically feasible to recharge excess surface water during the nonlrrigation season ln a groundwater reservoir for later utilization during the irrigation season. It was determined using the digital groundwater model, that about 77 percent of the water recharged during the non irrigation season (from September to May) in the South Platte Ditch, remained in storage in the aqUifer for available use by irrigation wells during the next irrigation season. The study also demonstrated that digital modeling of groundwater flow ls a practical and convenient tool to determine recharge credit. 2.1.3 Proctor Recharge Experiment The Procter recharge site is located northeast of Sterling near the town of Proctor. A recharge experiment was conducted in 1979 in which a pumped well was used to fill a potential recharge site located approximately one mile away ln the sandhills and about three miles south of the South Platte River. Eight wells were used to monitor the recharge. During the recharge experiment 420 acre-feet of water were pumped into a 525 acre series of depresslons over a 4 month period. The pumped well was located midway between the recharge site and the South Platte River. No water ponded 'in the depression during the entire four month period, and the water level in the observation well closest to the depresslon rose 25 feet. The water level in the pumped well was approximately 4 feet higher one month after the test than it was prior to the test, indicating that the recharge mound was moving toward the river. 9