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<br />Following is a table deriving the net evaporation for the months of July through November: <br /> <br /> <br />Table A <br />NET EVAPORATION FROM LAKE SURFACE <br />IN LYLE SMITH GRAVEL PIT <br /> Annual <br />Month July August September October November Total <br /> (in.j <br />Evaporation (in.) 6.84 6.54 5.20 3.57 2.32 <br />Precipitation (in.) 1.19 1.12 0.89 0.7 0.43 <br />Net Evap. (in.) = 6.01 5.76 4.58 3.08 2.02 21.44 <br />Evap.-0.70 x Precip. <br />Using a water surface of five acres, the total annual water replacement required is: <br />Annual water replacement = Zt-~jj~ x 5 acres = 8.93 acre feet per year <br />III -WATER REPLACEMENT SOURCE <br />It is proposed that replacement water will be provided by retiring approximately 5.6 acres of land <br />on which bazley and alfalfa have been grown, with emphasis on alfalfa. This land has been <br />irrigated with Trinchera Irrigation Company water. The land is located in the northwest comer <br />of the NW%+ Section 20, T. 30 S., R. 72 W., Costilla Estates Survey and is shown on a sketch <br />included in Appendix B. Available evidence indicates this land has been irrigated for many <br />years. A review of three aerial photographs of the subject land indicates that it was being <br />actively irrigated in 1955, 1963 and in a recent undated yeaz. It is estimated the average historic <br />irrigation demand on this tract of land has been 1.6 acre feet of water per acre based on four years <br />of alfalfa to one year of grain. The calculations for irrigation demand of grain and alfalfa are <br />shown on Table B and C. The retirement of 5.6 acres on which 1.6 acre feet of water per acre <br />was historically used will replace the 8.93 acre feet per year calculated to be lost due to <br />evaporation from the free water surface in the gravel pit. <br />The above described land to be dried up will be monumented to the satisfaction of the local <br />Water Commissioner. Further, the current property owner will provide an affidavit indicating <br />the subject land will remain dried up and a proportionate share of water previously diverted from <br />1 Trinchera Irrigation Company water sources owned by him will not be diverted while this <br />substitute water supply plan is in effect. An accounting system documenting reduced water <br />diversions will be supplied if required by the local V1'ater Commissioner or construction and use <br />of a recharge pit will be accomplished. <br />Since the exposure of the ground water in the pit coincides with operation of nearby irrigation <br />ditches, providing water from the retirement of imgated land will result in replacement with <br />water at nearly the same time the depletion occurs. Therefore, no water storage or release <br />schedule is necessary to provide water during the time of depletion. <br /> <br />