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, <br />' <br />' <br />1 <br />1 <br />��i <br />' <br />1 <br />' <br />' <br />' <br />� <br />' <br />, <br />� <br />' <br />' <br />1 <br />Specific yield or <br />Storage coefficient: Page 8, Colorado Water Resources Circular 29 "Analog Model of <br />the San Luis Valley, South-Central Colorado" by P. A. Emery, E. <br />P. Patten, Jr. and J. E. More, U. S. Geological Survey, 1975. <br />Numerous runs of the referenced computer model were made assuming a pit one acre in size and <br />recharge for 30 days with the rate being adjusted so the ground water mound formed did not <br />reach the elevation of the bottom of the recharge pit. Using this method maximum recharge rates <br />for a one month (30 day) period were derived. The information was plotted on a map included as <br />Figure 5.1. Although this information would be more useful if updated periodically, it can be <br />used as a guide by ground water users to determine the size of recharge pit and length of time <br />recharge is necessary at their location to replace ground water pumped. For example, if a ground <br />water user is located in the Town of Center, the probable recharge rate is 120 to 240 acre feet per <br />month (average = 180 acre feet per month). Assume water consumptively used on quarter = 150 <br />acre feet per year. Assume recharge water is available for 20 days per year. <br />150 ac. ft./yr. 30 days/yr. <br />Required pit size = lso a�. ft.iy�.ia�. X Zo aay�y�. — 1.25 acres <br />Since many localized variables can influence the recharge rate, Figure 5.1 should be used only as <br />a guide. A few of the localized variables that can significantly effect recharge rates are different <br />soils than the generalized information indicates, sealing of the recharge pit with silt and localized <br />ground water mounding due to nearby canals and ditches. <br />5.2 POSSIBLE INTEGRATED WATER MANAGEMENT PLAN <br />There are numerous canal systems that divert water for the purpose of ground water recharge in <br />the San Luis Valley. Review of depths to ground water indicate that available storage space in <br />the under ground aquifers is not used in an optimum manner. Therefore, a management program <br />could be useful to ground water users, however there are challenges involved because canal <br />5-2 <br />J <br />