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<br />11 acre-feet of unmetered water was used for backwashing. The total net <br /> <br />use at Page was 1,558 acre-feet, Effluent from the Page sewage treatment <br /> <br />a <br />(~-) <br />N <br />c.o <br />c:' <br />W <br /> <br />plant is discharged into lined stabilization ponds and allowed to evaporate. <br /> <br />Therefore, the use at Page represents a corresponding depletion to the river. <br /> <br />Water pu~ped at Glen Canyon Dam and Visitor Center during the first part <br /> <br />of 1973 was 14 acre-feet. This, together with the 28 acre-feet supplied <br /> <br />from Page, gives a total water year use of 42 acre-feet at the dam and <br /> <br />visitor center. Some of this water was used for landscape irrigation but <br /> <br />a high proportion was returned to the river as chlorinated sewage effluent. <br /> <br />For purposes of this report, it was assumed that the 1973 water uses at <br /> <br />Glen Canyon Dam and Visitor Center represent a near-zero depletion to the <br /> <br />river, <br /> <br />The National Park Service operates two domestic water wells at Wah- <br /> <br />weap, a recreational community on the shores of Lake Powell. Pumping <br /> <br />records for 1973 indicate that a total of 194 acre-feet of water was pumped <br /> <br />from thesa wells, Part of the water was used for landscape irrigation <br /> <br />and a minute portion probably returned to Lake Powell through deep per- <br /> <br />colation. The remainder of the pumped water was used for domestic pur- <br /> <br />poses by the residents, tourists, and concessionaires. Wahweap has a <br /> <br />sel,'age treatment plant which terminates in evaporation ponds, For pur- <br /> <br />poses of this study it was assumed that the total amount of pumped water <br /> <br />represents a depIction to the river system chargeable to Arizona. <br /> <br />In 1973 water was snpplied from Lake Powell for construction purposes <br /> <br />to tile Navajo Powel"plant. ~Ictcrcd treated water llHCd at the Navaj() P],anL <br /> <br />Si.Ll' \\"a.s III ':lcr(>-r('L~t. ~kL(,J:v.d r~l\v \v{.lL(~r lI.";ed for consLructi.l!1 of Navajo <br /> <br />C()llL'raling I'LlIlL. l'aci.1.iLi('H was 103 [{cre-feet. Pl~(,sulnah]y, vet.y lil~llc <br /> <br />('If Lid.:'::: \\r~lr.('r \\ra~; 1:('l:urn{'d t'o che r:1.\I('1:' HystC'lll. <br /> <br />(, <br />