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<br />3. Basin Water Supplies (Cont1d)s
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<br />River, Station.
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<br />Green River at Houth
<br />Colorado River above Green R. Junction
<br />(By addition, Colo. R. below Green R. Jet.)
<br />(By subtraction, net effect of tribs.to lee Ferry)
<br />Colorado River at li:le Ferry
<br />Little Colorado River at Houth
<br />Vir gin River at Li tt lef'ie Id
<br />Colorado River at Laguna Dam
<br />Gila River at Phoenix
<br />Gila River at Dome (near Houth)
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<br />Aore Feet.
<br />
<br />5,903,COO
<br />7.269,000
<br />(13,192,000 )
<br />( 3.079,000)
<br />16.271,000 (1)
<br />338,000
<br />310,000
<br />16,451.000
<br />2.262,000
<br />1.271,000
<br />
<br />The Report points out that, where the Upper Basin has depleted the
<br />flow by 7,500,000 acre feet, .. the amount allotted by the Compaot, .. the flow
<br />at Lee Ferry will average 8.771,000 acre feet annually.
<br />
<br />NOTE (Ih The flow of the Colorado River at we Ferry (including Paria) dur-
<br />ing the period 1897-1943. according to records and caloulations
<br />heretofore adopted by U.S.B.R. and this office, averaged 14,358,000
<br />acre feet per year; and upstream depletiorus W3re estimated at an
<br />average of 1,865,000 acre feet per year) the sum of the two, or
<br />16,223,000 AF annually, being the estimated virgin flow, or the
<br />long time average flow that would have been recorded had there
<br />been no diversions or man-made depletions upstream. Note the
<br />slightly greater figure used in the Report. The minor difference
<br />is unimportant. The point is that virgin' conditions, as above es-
<br />timated, are based on long tike averages.
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<br />NOTE (2), Total original runoff in the Upper Basin, or total water produc-
<br />tion (as that term is used in Colorado) would exceed the virgin
<br />flow at lee Ferry by the natural losses encountered in the convey-
<br />ance of ""ter from the upstream plaees of production to the point
<br />of measurement at Ltle Ferry. Suoh natural losses (note those on
<br />Gila) in the Upper Basin appear to have been ignored in both the
<br />Compaot and the Report.
<br />
<br />As estimated in the Report the stream depletions in the Upper Ba-
<br />sin, at present, average 2.L40,000 acre feet annually, and in the Lower Ba-
<br />sin average 4,500,000 acre feet annually, including allowances for projeots
<br />reoently constructed, under oonstruction, or authorized" but not as yet in
<br />operation. As examples of suoh allowances. note the inclusion of estimated
<br />depletions by 22,000 acres to be irrigated by the Eden projeot in Wyoming,
<br />by the 260,000 acre feet to be exported by the Colorado-Big Thompson projeot,
<br />and by the 579,000 acres to be irrigated in the Lower Basin.
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<br />NOTE (3). Exclusive of potential projects desoribed in the Report, the vir-
<br />gin flow at Lee Ferry, after projeots now authorized come into op-
<br />eration, will average 16,271,000 minus 2.L40,00o or 13,831,000
<br />ao re"feet annually; and, when the 579,000 aores of land not now
<br />irrigated in the Lower Basin has come under irrigation, so as to
<br />bring the Lower Basin depletions up to the estimated total of
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