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n:-"1'7? vL _' . J Municipal and Industrial Average annual streamflow depletions for municipal and industrial (M&I) use represents only a small amount as compared to depl etions for irrigation; nevertheless, the issues and needs rel ating to this use are of continually growing proportions. The most significant municipal supply problems exist in Colorado's Front Range, particularly the Denver metropolitan area. Other areas include the cities of Casper and Cheyenne in Wyoming as they continue to increase in population. The Upper Platte River Basin's population is projected to increase by 2,397,000 persons by year 2020. If 180 gallons per capita per day usage is assumed, the increase in M&I water needs by 2020 is 483,340 acre- feet. The vast maj ority of these needs wi 11 occur in the Co 1 orado portion of the study area. An estimated 88 percent of the basin's pop- ulation increase will occur in Colorado. This equates to an increase in M&I water needs of 425,485 acre-feet by year 2020. Conserv at i on measures, if impl emented, coul d reduce the incremental water needs. The water conservation measures that would provide the greatest potential for reduction would be associated with outside water uses, such as lawns, shrubbery, and gardens. According to a 1975 study by the Denver Water Department,.!; presently estimated developed water supplies in the Denver metropolitan area would yield approximately 430,000 acre-feet in a dry year. This includes all water suppl iers, including the Denver Water Department which has an annual firm supply of 295,000 acre-feet. This amount of water was considered sufficient to meet the demands of the metropolitan area for a population of 1.8 million. Therefore, the 1980 metropolitan population of 1.6 million is very close to using the presently available water supplies. Between 1980 - 2020, the Denver metropol itan area popul ation is projected to increase by 1,659,700 persons, result i ng in the need for an additional 334,600 acre-feet of firm water supplies by the year 2020. Some of this water may come from the Denver Water Board's plan to recycle approximately 100 million gallons per day of waste water for municipal use. Other larger Front Range communities, such as Greeley, Loveland, Estes Park, and Fort Collins, are also in need of additional water supplies to meet continued population growth. The Windy Gap PrOject is being developed to supplement the above communities' water supplies. In the Wyoming portion of the study area, the projected population increase of 245,463 between 1980 - 2020 equates to a need of 49,490 acre-feet of additional municipal water suppl ies. The cities of Casper and Cheyenne face the most significant domestic .!; Metropolitan Water Requi rements and Resources, 1975-2010, Prepared by Denver Water Department under the direction of Denver Regional Counci 1 of Governments for the Colorado State Legi sl ature, Metropolitan Denver Water Study Committee. 31