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The 273.3 acre-feet of water diverted through the <br /> Highline Canal was historically used to irrigate seventy-four <br /> (74) acres of pasture grass and alfalfa on the tract of land <br /> identified in Figure 3 as 262-007. Using the modified <br /> Blaney-Criddle Method (Reference 2) and temperature (Table 4) <br /> and precipitation (Table 5) data for Nucla as derived from <br /> the Norwood and Uravan weather stations (Figure 1) , the <br /> average annual consumptive use of irrigation water <br /> historically used on the 74 acres was calculated to be 114 . 5 <br /> acre-feet for the period 1970-1986 (Table 9) . The temp- <br /> erature and precipitation values used in the calculations <br /> were the averages of data from the two stations. The <br /> modified Blaney-Criddle method is the standard accepted <br /> method used to calculate consumptive-use requirements for <br /> crops in Colorado. <br /> PCC therefore has a consumptive-use credit of 114 . 5 <br /> acre-feet of water previously used for irrigation to use as <br /> a water supply for the mining operation and in the <br /> augmentation plan. The existing rights will however have to <br /> be changed to include industrial use and storage. Storage <br /> rights associated with the six ponds will also be used as a <br /> water-supply source during the non-irrigation season, as no <br /> consumptive-use credit is available during the months of <br /> November through March. <br /> 22 <br /> GEOTRANS, INC. <br />