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Population projections were made in 1964 by the Inter-County Regional Planning Commission for the period 1960-2025. A straight line projection for that same period based upon the rate of growth experienced during the 1950-1960 period is also shown. The range of projections is as follows: (Population in thousands) Explanation 1980 2000 2020 2025 of pro.iections Constant growth based upon 1950-1960 rate 1,408 1,952 2,496 2,632 I-CRPC median growth 1,685 3,000 4,810 5,300 I-CRPC high growth 1,870 3,500 6,040 6,780 The per capita use of wate~ varies widely between metropolitan communities. The city of Denver averaged 194 gallons per capita per day during the study period; however, the use of water was restricted in 1954, 1955, and 1956. The rate of use on a gallon per capita per day basis has increased from an average of 181 in the 1930's and 1940's to 194 in the 1950's and 210 for the first four years in the 1960's. A consumption rate of 236 gallons per capita per day was used for the metropolitan area under future conditions, as computed by studies made for the Denver Water Board. WATER SUPPLY About 500,000 acre-feet of storage capacity is presently available in the following Denver reservoirs: Antero, Elevenmile, Cheeseman, Ralston, Gross, and Dillon. With full development of the water resources presently available to the metropolitan area, a future average supply (without the Two Forks Reservoir) of 594,500 acre-feet annually can be anticipated. That total supply would serve an estimated 2,255,000 persons based upon the per capita requirements specified previously. That estimate would indicate a need for the Two Forks Reservoir completed and water in storage by about 1988 under the median growth projection and by about 1984 under the high growth projection. During the 1947-1961 period, the historical metropolitan diversions are estimated to have averaged 146,100 acre-feet annually. With the Two Forks Reservoir, the total water supply available to the metropolitan area is estimated to average 746,600 acre-feet annually which would meet the requirements of about 2,830,000 people. This annual yield does not include sewage effluent that would be stored in the Hudson Reservoir. The total outflow from the sewage plant is esti- mated at 320,400 acre-feet annua11y--an increase of 259,100 acre-feet over historical conditions. Deduction of 57,000 acre-feet for replace- ment of water diverted upstream and an estimated 8,000 acre-feet for annual evaporation would leave a remaining supply of 194,100 acre-feet. 3 Revised 3/65