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<br />at each reservoir site was determined using this relationship. Applica- <br /> <br />o <br />C') <br />N <br />~ <br />o <br />N <br /> <br />tion of the appropriate pan factor resulted in estimates of gross lake <br /> <br />evaporation, Net evaporation was computed by taking into account the <br /> <br />precipitation salvaged due to the presence of the reservoir. The net <br /> <br />evaporation was applied against the net surface area to yield the esti- <br /> <br />mates of 1973 reservoir evaporation shown in the last column of Table 7. <br /> <br />Municipal, Domestic, and Industrial Uses <br /> <br />Most of the municipal and domestic water consumed by the Indian pop- <br /> <br />u1ation is pumped from wells. However, very few well pumping records are <br /> <br />available. In order to estimate the municipal and domestic water uses of <br /> <br />the Navajo Nation, use was made of the approach adopted for the Upper <br /> <br />Colorado Region Comprehensive Framework Studies. <br /> <br />The Indian population in the Arizona portion of the Upper Colorado <br /> <br />River Basin in 1966 was 27,772. It was estimated that the per capita <br /> <br />water consumption of the Indian population was 26.6 gallons per day. Ap- <br /> <br />plying this consumptive rate against the population figure resulted in a <br /> <br />depletion of 833 acre-feet per year. The 1980 level of depletion was <br /> <br />estimated at 1,611 acre-feet per year which is based on a population of <br /> <br />39,300 and a per capita consumptive use of 37 gallons per day. <br /> <br />Interpolation between the 1966 and 1980 levels of depletion results <br /> <br />in a value of 1,222 acre-feet per year for 1973. <br /> <br />The tOI,'O of Page pumps its water supply from Lake P(lI"ell at Glen Can- <br /> <br />y,'n nalll. Tile waU'l: is treated and then metered to the residents, Total <br /> <br />tnt'tt'rl.:,d outflo'\:V frnm the Page sysl~em during 1~)73 'A'3S 1,575 acrc-fcpt. Of <br /> <br />this ,:1111di.H1L, 2S ,.lC're-fcel: \v'as supplied to l'he Glen Canyon Dam and Visitor <br /> <br />C,'nler dllrill!:' till' latter part of thcyear. lLc I"as cstimatc.d lJwt about <br /> <br />5 <br />