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<br />Conclusions <br /> <br />o <br />("") <br />N <br />(..Q <br />C) <br />..0::.. <br /> <br />The estimated consumptive uses and losses in the Arizona portion of <br /> <br />the Upper Colorado River Basin for the 1973 water year total 11,410 acre- <br /> <br />feet, Of this amount, 1,970 acre-feet are pumped from Lake Powell (or <br /> <br />from shoreline wells) and clearly represent a depletion to the Colorado <br /> <br />River at the Compact Point. The remaining 9,440 acre-feet are "on-site" <br /> <br />consumptive uses and losses and do not necessarily represent a correspond- <br /> <br />ind depletion to the Colorado River. The drainage system of the study <br /> <br />area is characterized by sandy washes which only intermittently contain <br /> <br />a flowing stream. No doubt if the "on-site" depletion water had been <br /> <br />allowed to flow downstream, Some of it would have been lost through chan- <br /> <br />nel evaporation and phreatophyte growth, It is at present impossible to <br /> <br />estimate with any assurance what proportion of this water would have been <br /> <br />naturally lost before reaching the Colorado River at the Compact Point. <br /> <br />7 <br />