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I I I I I I I I I I I I I I I I I I I Seclioll 5 - Colorado Willer LI.\e Tn'lld.\ Requirements ji)r additional supplies could occur as early as 2015, and by the year 2100 the minimum additional supply required for statewide M&/ use is estimated to be about 550,000 acre-feet, when considered on a regional basis. However, demands for in- dividual providers can differ considerably from the regional av- erage due to local growth trends and individual water require- ments, M & I demands in the Front Range metropolitan area were esti- mated in the Metropolitan Supply Environmental Impact State- ment. This study projected a Front Range population of 3,830,000 in 2020, and a water demand of 703,000 acre-feet by 2035, This compares to the existing M & I demand in all of Water Division I of about 640,000 acre-feet. Requirements for Additional Supplies Projection of additional statewide water requirements involves interpretation and extension of several types of information gath- ered in the current study. Municipal, industrial and irrigation water uses are the major water use activities which may incur shortages in the future, Due to lack of information on the avail- ability and timing of surface and groundwater for irrigation, it is difficult to estimate the magnitude of irrigation water use as com- pared to supplies in the future. If projections showing a decrease in agricultural water usage are correct, available supplies should be adequate to meet future irrigation demands as long as existing irrigation water supplies and water rights are protected, For pur- poses of the remainder of this report, it will be assumed that there will be no additional demand for agricultural water, and that all increased statewide water demand occurs in the M & I sector. The need for additional M & I water is estimated based on the projected population, water demands, and the 1996 Colorado Water Needs Survey results. Figures 15 to 20 illustrate the pro- jected demands based on population projections and based on survey results, and estimated dry year yields as derived from the survey data, Both statewide projections and individual Water Division projections are presented in these figures, (With lim- ited returned surveys from Divisions 3 and 6, reasonable projec- tions can not be derived for these two Divisions.) As illustrated in these figures, a range of dry year yield (low estimates and high estimates) is presented, Low and high estimates are derived as- suming agencies which did not provide information on their dry year yield estimations can supply their service area's growth up to year 20 I 0 and 2100, respectively, with existing supplies, 5-9 __ coLOraoo ,__ Farm BUreau