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i~ Jack Haines February 13, 1976 Page Three A 1954 appropriation water right and a date of adjudication in 1976 or 1977, assuming action is taken to adjudicate the rights, will be very junior. The rights are not, by them- selves, considered adequate to use for replacement water to offset +-he open lake evaporation from 'the :Wining operation. Initial contact has been made witl; GASP (Ground Water Appropriators of the South Platte Basin) and it is anticipated that augmentation water will be pro'~ided through phis organ- ization to prevent injury to downstream water rights. WATER USE Historical As discussed previously irrigation water was used on tl~e property to irrigate approximately 65 acres of alfal~a and 55 acres of pasture. The consumptive use of irrigatio.. water, as determined by the method outlined in the Soil Conservation Service Technical Release No. 21 is 1.66 feet for alfalfa and 1.33 feet for pasture. Since the pasture is on the l.a lying land adjacen* ~o the river some of the water supply is likely to have come from sub-surface irrigation. It is assumed that 508 of the water requirement for pasture was provided by surface application. Assuming water was physically applied when required to sustain crop growth, the total irrigation consumptive use for alfalfa in an average year was 108 acre-feet and for the pasture was 37 acre-feet. The open water surface of the sumps, approximately 3.5 acres, had a net evaporation after deduction of precipitation of 2.16 feet, or a total oL 7.6 acre-feet p:r year. The total irrigation water use plus evaporation from open water surface was 153 acre-feet per year. Present There is no irrigation of any of the property at the present time and, therefore, no irrigation consumptive use. Evapora- tion from the 15.6 acres of open water surface totals approximately 34 acre-feet per year. Future The maxirum amount of open water surface, if the total amount of evaporation loss is not to exceed the historic water use on the property, is 71 acres. A reclamation plan should be developed which limits the open water surface area to this amount. At the present time one unit of GASP will provide 100 acre-feet of reolacemen: water, or an amount sufficient to replace the evaporation from 46.3 acres of open water.