OCR Text |
Show SUMMARY Water withdrawal requirements for municipal and industrial water uses in the Upper Colorado Region amounted to 123,900 acre-feet in 1965. Water depletion requirements totaled 62,300 acre-feet, amounting to 50 percent of the withdrawals. Domestic water use amounted to 42 percent of the Regional withdrawal, and livestock used about 30 percent. The Upper Main Stem subregion, which has the largest population, accounted for the largest subregional withdrawals (45,600 acre-feet) and depletions (23,500 acre-feet). The San Juan-Colorado Subregion had the smallest withdrawal (29,400 acre-feet) and depletion (17,600 acre- feet), although its population was larger than the Green River Subregion. The relatively low water use in the San Juan-Colorado Subregion can be attributed to a large Indian population within the subregion and a lack of adequate water distributions facilities in the Indian communities. Seventy-five percent of the Regional municipal and industrial withdrawal requirements were supplied by surface water sources and the remainder by ground water sources. An estimated population of 260,800, or 78 percent of the Regional population within the hydrologic boundaries, was served by 192 municipal systems in 1965. Inadequate municipal water source protection and treatment is prevalent in the Region, with chlorin- ation the major improvement required. The 2020 municipal and industrial withdrawals and depletions are estimated to be 347,900 and 169,100 acre-feet per year, respectively, representing more than a two-fold increase from 1965. Municipal and industrial water depletions accounted for only 1.8 percent of the total regional water use in 1965, and are expected to account for about 2.6 percent by 2020. Withdrawals for commercial uses will be largest (94,000 acre-feet) with domestic uses following (88,000 acre-feet). A projected 86 percent increase in population (includes hydrologic acre of Arizona), more than eight-fold increase in the ecomonic activity in the commercial category, and an increased water-use rate by the Region's Indian and rural residents are the major reasons for the growth of municipal and industrial water demands. Future municipal and industrial needs will be met by developing additional surface and limited groundwater supplies and by converting some agricultural water to municipal and industrial uses. The non-federal investment costs for development and treatment are projected to be $2.6, $6.5 and $9.0 million for the 1966-1980, 1981-2000 and 2001-2020 time frames, respectively. These totals represent the single-purpose costs of developing 20 to 30 percent of the future needs and costs of treating all future municipal and industrial requirements. Costs of distribution systems from the treatment plant to the consumer are not included. Costs of federal multi-purpose projects that have a |