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<br />COLORADO <br /> <br />ASSUMPTIONS AND METHODOLOGIES FOR SRF <br />ASA 1301 <br /> <br />Population and earnings were furnished by the Colorado Water Conservation <br />Board. The land use estimates were taken from SCS Mini Report No.3, <br />January 1976. <br /> <br />Domestic, commercial, and industrial water supplies were those presented <br />in the State Water Plan, Phase I. <br /> <br />Irrigation withdrawal requirements were based on data in SCS Mini Report, <br />January 1976. , The average historic withdrawal was reported to be <br />J <br />1,450,000 acre-feet, which amount was 85% of the irrigation requirement. <br />Thus, the irrigation withdrawal requirement amounts to 1,450,000/0.85 ~ <br />1,705,822 acre-feet (1523/MGD for year 1975). <br /> <br />It was estimated that improvements in the irrigation systems in the <br />future would reduce water losses by 5% by year 1985 and 10% by year 2000. <br />Thus, irrigation withdrawal requirements for those years were reduced <br />in like amount. <br /> <br />The MCC data for manufacturing,' minerals, livestock, and public were <br />reviewed and were accepted as being reasonable. <br /> <br />The present modified flow is the average gaged flow on the Rio Grande <br />River at the New Mexico/Colorado State line for the period 1968-1974, <br />inclusive. <br /> <br />Ground water withdrawals are those reported in the SCS Mini Report No.3, <br />January 1976. <br /> <br />Evaporation estimate was amount presented in the SCS Mini Report No.3, <br />January 1976. <br /> <br />Depletions were computed by subtracting the total basin losses developed <br />above from the average basin inflow of 1,581,000 acre-feet (1,411.6 MGD). <br />(Same method as used in Table 3.1, State Water Plan, Phase I.) <br /> <br />- r -' " <br />1...,; 'J i:..i.. i. to) <br /> <br />83a <br />