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o ,-) N c.o ..... c.o population was 26'.6 gallons per day. Applying this consumptive rate against the population figure resulted in,a depletion of 833 acre-feet per year. The 1980 level of depletion was estimated at 1,611 acre-feet per year which is based on an estimated population of 39,300 and an assumed per capita consumptive use of 37 gallons per day. Interpolation between the 1966 and 1980 levels of depletion results in the values shown in Table 1. A report from the Navajo Tribal Utility Authority of water consump- tion during 1979 from NTUA systems gave the following: Location Chinle Tsaile Many Farms Kayenta Yearly Consumption (acre-feet) 520 80 34 ,392 1,026 Number of Services 479 62 72 281 This would be included in the estimated 1,560 acre-feet value shown in Table 1 for 1979. The town of Page pumps its water supply from Lake Powell at Glen Canyon Dam. The water is treated and then metered to the residents. Effluent from the Page Sewage Treatment Plant is discharged into lined stabilization ponds and allowed to evaporate. Water meter readings were supplied by the Page Town Manager. Water use values are shown in Table 1. The National Park Service operates domestic water wells at Wahweap, a recreational community on the shores of Lake Powell. The amounts of water pumped from these wells are shown in Table 1. Part of the water was used for landscape irrigation and a minute portion probably returned to Lake Powell through deep percolation. The remainder of the pumped water was used for domestic purposes by the residents, tourist3, and concessionaires. Wahweap has a sewage treatment plant which terminates in evaporation ponds.