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<br />SUMMARY
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<br />Water withdrawal requirements for municipal and industrial water
<br />uses in the Upper Colorado Region amounted to 123,900 acre-feet in 1965.
<br />Water depletion requirements totaled 62,300 acre-feet. amounting to 50
<br />percent of the withdrawals. Domestic water use amounted to 42 percent
<br />of the Regional withdrawal, and livestock used about 30 percent.
<br />
<br />The Upper Main Stem subregion, which has the largest population,
<br />accounted for the largest subregional withdrawals (45,600 acre-feet)
<br />and depletions (23.500 acre-feet), The San Juan-Colorado Subregion had
<br />the smallest withdrawal (29,400 acre-feet) and depletion (17,600 acre-
<br />feet), although its population was larger than the Green River Subregion,
<br />The relatively low water use in the San Juan-Colorado Subregion can be
<br />attributed to a large Indian population within the subregion and a lack
<br />of adequate water distributions facilities in the Indian communities,
<br />
<br />Seventy-five percent of the Regional municipal and industrial
<br />withdrawal requirements were supplied by surface water sources and the
<br />remainder by ground water sources. An estimated population of 260,800,
<br />or 78 percent of the Regional population within the hydrologic boundaries,
<br />was served by 192 municipal systems in 1965. Inadequate municipal water
<br />source protection and treatment is prevalent in the Region, with chlorin-
<br />ation the major improvement required.
<br />
<br />The 2020 municipal and industrial withdrawals and depletions are
<br />estimated to be 347,900 and 169,100 acre-feet per year, respectively,
<br />representing more than a two-fold increase from 1965. Municipal and
<br />industrial water depletions accounted for only 1.8 percent of the total
<br />regional water use in 1965, and are expected to account for about 2,6
<br />percent by 2020, Withdrawals for commercial uses will be largest (94,000
<br />acre-feet) with domestic uses following (88,000 acre-feet). A projected
<br />86 percent increase in population (includes hydrologic acre of Arizona).
<br />more than eight-fold increase in the ecomonic activity in the commercial
<br />category, and an increased water-use rate by the Region's Indian and
<br />rural residents are the major reasons for the growth of municipal and
<br />industrial water demands.
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<br />Future municipal and industrial needs will be met by developing
<br />additional surface and limited groundwater supplies and by converting
<br />some agricultural water to municipal and industrial uses.
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<br />The non-federal investment costs for development and treatment are
<br />projected to be $2,6, $6,5 and $9.0 million for the 1966-1980, 1981-2000,
<br />and 2001-2020 time frames, respectively, These totals represent the
<br />Single-purpose costs of developing 20 to 30 percent of the future needs
<br />and costs of treating all future municipal and industrial requirements.
<br />Costs of distribution systems from the treatment plant to the consumer
<br />are not included. Costs of federal multi-purpose projects that have a
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