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<br />. <br /> <br />. 0 ~ (' <br />Ur.d,u <br /> <br />purposes of this demonstration. The Sand Hill lateral takes water out of <br /> <br /> <br />the South Platte Ditch, 5.4 miles from the river diversion point. During <br /> <br /> <br />three test periods in the spring and fall of 1974 and the spring of 1975, <br /> <br /> <br />a total of 1,925 acre-feet of water was diverted into the lateral, of which <br /> <br /> <br />1,553 acre-feet of water was recharged by seepage from the lateral. The <br /> <br /> <br />excess water from the canal flowed into a recharge pond at the end of the <br /> <br /> <br />lateral. Although specific rises in the water table that were attributable <br /> <br /> <br />to the recharge from the lateral and recharge pond were difficult to <br /> <br /> <br />determine, the water table was definitely raised in the recharge area and <br /> <br /> <br />adjacent areas. <br /> <br />. <br /> <br />Recharge System Considerations <br /> <br /> <br />The selection of a feasible method for an artificial recharge system <br /> <br /> <br />should be based on consideration of the various physical parameters in the <br /> <br /> <br />project area. <br /> <br />The availability of surface water to recharge is obviously the basic <br /> <br /> <br />concern. Careful consideration should be given to the quantities of surface <br /> <br /> <br />water and the time frame of availability. For instance, if excessive flood <br /> <br /> <br />waters are the principal source of recharge water, the recharge system must <br /> <br /> <br />necessarily be designed to handle large quantities of water in a relatively <br /> <br /> <br />short period of time. <br /> <br />The potential storage capacities of the aquifer are also a basic <br /> <br /> <br />concern. In an area where the aquifer is already saturated,the potential for <br /> <br /> <br />artificial recharge is minimal. But in an area where the use of ground <br /> <br /> <br />water exceeds the natural recharge rates, the potential for artificial <br /> <br /> <br />recharge is enhanced. <br /> <br />-'" <br /> <br />. <br /> <br />The soil type or surface deposits of an area directly influence the <br /> <br /> <br />rates of infiltration of water and subsequently the method of recharge to be <br /> <br /> <br />used. In an area where sand was the surficial deposit, with little or no <br /> <br /> <br />soil development, infiltration rates would be high and any direct application <br />