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<br />At project completion, 253.42 acres will be permanently dried up. Figure 5 is a map of <br />the land to be dried up. Based on the historical consumptive use associated with the parcels to be <br />dried up, the average consumptive use credit is 1.444 acre-ft of water for each acre of land dried <br />up. This consumptive use credit is also equal to 2.534 acres of land per acre of gravel pit surface <br />exposed. <br />The surface imgation supplies that historically irrigated the parcels to be dried up will <br />diverted and measured into the gravel pits. New lands will not be irrigated by this supply. This <br />replacement water shall offset out-of-priority depletions and insure that return flow patterns will <br />continue at historical levels and near their historical location Replacement water to compensate <br />out-of-priority depletions will be available in the proper quantity, quality, place, and time to insure <br />that existing water rights are not injured. Using a 50% application efficiency as confirmed above, <br />7.32 acre-ft of surface water will be augmented back to the ponds per acre of exposed gravel pit <br />area (3.66 acre-ft of evaporation per acre of pond surface area / 0.5 = 7.32 acre-ft of <br />augmentation per acre of pond surface area). This replacement water shall originate from the _ <br />same source and be of sufficient quantity to account for historic irrigation practices on the parcels <br />that are dried up. At project completion, 526.6 acre-ft per year of Fish Ditch and 205.6 acre-ft <br />per year of Rio Grande Canal for a total of 732.2 acre-ft per year shall be augmented to the gravel <br />pit. <br />Table 6 illustrates the estimated timing of depletions from and replacements to the aquifer <br />system. Actual surface water recharge rates shall be based upon the timing of surface water <br />availability. Less than 8.5°io of the pond evaporation occurs during the winter months when the <br />ponds are typically frozen over and a consumptive use credit is not available. 76% of all <br />depletions occur during months when replacement water is available. <br />An accounting form has been developed to assist in tracking depletions and replacements. <br />A copy of the accounting sheet is contained in Appendix D. The accounting form tabulates out- <br />of-priority depletions from ground water surface evaporation and gravel washing water as well as <br />replacement sources from irrigated land dry-up and surface water replacement on a monthly and <br />annual basis. This accounting sheet will be maintained to verify compliance with the <br />augmentation of replacement waters. This accounting sheet shall be provided to the Water <br />Commissioner and Division Engineer as needed. <br />13 <br />