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. ~~ .<('~. i>~' t- .JU"j! '4 Municipal and industrial water requirements The firm of Cameron and Jones, Incorporated,consulting engineers, of Denver has made an investigation and report on "Water Requirements for Oil Shale, 1960-1975" for the State of Colora.dOWiiich is reproduced in full as Appendix D of this report. The report dis- closes that diversion requirements for municipal and incl.ustrial pur- poses in western Colorado and Utah are expected to be 252,000 acre- feet annually by 1975. Of this total, 159,000 acre-feet of water would be consumed and 93,000 acre-feet would return to the streams. It is estimated, further, that 80 percent of the total municipal and industrial water diversion requirements would occur in an area along the Colorado River between Rifle and De Beque, Colorado. The 1975 consumptive use requirement in this area would be 80 percent of 159,000 acre-feet, or 127,200 acre-feet which could be supplemented or partly fulfilled b~r storage releases from Ruedi Reservoir. A portion of the requirement could be met by surplus flows at points of use in the Colorado River. . To ascertain the portion of the total requirements to be derived in 1975 from flows in the Colorado River, a dai~.y operation study for the critical year 1934 was made for the entire Colorado Ri ver system above Cameo assuming future depleted conditions. This analysis indicated that the consumptive use requirement.of 127,200 acre-feet (175 c.f.s.) could be met by 88,200 acre-feet of Colorado River flows and 39,000 acre-feet released from Ruedi Reservoir. The water yield of Ruedi Reservoir will be greater than the required 39,000 acre-feet of releases in 1975. It was necessary, therefore, to project the 1975 requirements by Cameron and Jones into the future to determine approximately when the full yield of the reservoir would be required. The current national population growth trend of about 15 percent per decade was applied to the 1975 require- ments. Commercial oil shale development with accompanying urbaniza- tion might expand at a much faster rate. In any case, the projected estimates show that about 50 years after the scheduled construction of Ruedi Dam and Reservoir, or by the year 2014, the consumptive use requirement in the Rifle-De Beque area would reach 300 c.f.s., or 217,200 acre-feet. After use of available river flows in a critical year like 1934, 70,000 acre-feet of the requirement in year 2014 would need to be furnished from Ruedi Reservoir. This is the maximum yield of the reseltvoir in a year such as 1934. Exhibit 4 graphically shows the estimated requirements for municipal and industrial water. . 20