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<br />(j['15J7 <br /> <br />.20.. <br /> <br />respeotive rights and obligation~ of individual states above Lee Ferry, has <br />further extended Rnd oomplioated the work of the Upper Basin Engineering <br />Commi ttee. The R.eport should present estimate~ of the oontributions of eaoh <br />state to the long..time average virgin flow. of the Colorado River at Lee <br />Ferry, together with similar information for a period suoh as 1931-1940 <br />when streamflows for ten oonseoutive year~ wore the lowest of reoord. <br /> <br />" <br /> <br />4. Pasture Land Irrigation. The Report estimate~ that, ultimately, <br />500,000 aore feet of wate.~il be oonsumed annually by the irrigation for <br />pasture purposes of 500,000 aores' of land in the Upper Basin. This is in <br />addition to lands presently irrigated and to be served by so_oalled potential <br />projeots listed in the Report. Colorado notes that, while this allowanoe <br />of 500,000 aore feet of water is inoluded in the reported total ultimate <br />depletions upstream from Lee Ferry, the Report fail~ to desoribe the <br />required fRcilitiee and works, or to inolude estimateffi of their oonstruotion <br />oosts. The Report also fails to segregate thim assumed future oonsumption of <br />water among individual states, or to indioate the looations of the assumed <br />pasture lands on the maps presented in Appendir II, More definite and <br />detailed information would faoilitate both the planffi for the development and <br />the pending negotiations among affeoted states, Sinoe the existing aoreage <br />irrigated in the Upper Basin inoludes- hay_lands from whioh the orops. are <br />harvested: at times and at othelr timell are used for the pasturing of livesto<lk, <br />it appears that the assumed future pasture lands might similarly be olaosif"ed <br />as irrigated lands, without attempting to distinguish between methods of <br />harvesting. The required works and faoilities might properly be inoluded <br />wi th so-oalled potential projeots as oonstruotion possibilities. <br /> <br />.0 <br /> <br />~ <br /> <br />5. Reservoirs above Lee Ferry. The so-oalled potential projeot~ <br />listed in the Report inolude a number of possible reservoirs in the Upper <br />Basin above Lee Ferry, at sites along the Colorado, San Juan and Green <br />rivers, looated generally below the lands irrigated in the Upper Basin. <br />Their purposes inolude power production, flood control, silt detention, <br />streamflow regulation, and hold-over storage. The Report presents estimetee <br />of' oonstruotion oosts and power production for ea0h reservoir, but failff to <br />disolose information as to the status of upstream development assumed fOIr <br />purposes of estimating the power produotion, The total loss of water from <br />the whole group of reservoirs is reported: at 831,000 aore feet per year, <br />but the Report fail~ to segregate the estimated total loss a~ong individual <br />reservoirs, or to explain the faotors employed in estimating the reservoir <br />losses, A comprehensive' engineering investigation is required, including <br />definite and detailed: river and reservoir operation studies, the results of <br />whioh should appear in the Report, to the end that oonstruotio~ oostffi and <br />water losse~ may be oompared with project benefit5, and to define the areas <br />and interests that woulcr benefit from operatioms of the reservoirm for their <br />various intended purposes. <br /> <br />, <br /> <br />I <br /> <br /><l <br /> <br />The affeoted state5 above Lee Ferry need to know. how far' development <br />oan proceed before any of the potential oapaoity of these reservoir5 will be <br />needed for holdover storage purposes. They should be advised as to how muoh <br />