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<br />0;) ~,O ,,) <br />l ,-,0 J d <br /> <br />c7tQ. -, <br />F/l, /~ <br />A'Pf1,.... <br />....t.,.......r. <br />1f,,1.41? <.. i ~'l..'i.} <br />09" <br />CQ" n~,..) ~7.? <br />Ij/~.x......."'''''. it <br />"'i~ '4r~., <br />. !i.a'f( .... <br />October through February 9recipitation over the Upper Colorado~r <br />Basin varied from 96 percent of mormal for the Colorado River water- <br />shed above Cisco, Utah, to 100 percent of normal for the Green River <br />water shed above Green River, Utah, and 68 percent of normal for the <br />San Juan River watershed ":,,.,ve Bluff, Utah. Based on this snd snow <br />data, the forecast runoff of the Colorado River and tributaries at <br />damsites of the Colorado River Storage Project is as follows: <br /> <br />UNITED STATllS <br />DEPAR'I'MENT OF THE INTERIOR <br />BUREAU OF RECLAMATION <br />SALT LAKE CITY, UTAH <br /> <br />March 1, 1972 <br /> <br />Forecast of Apri1-July 1972 Reservoir Inflow in 1,000 Acre-Feet <br /> <br />, <br /> <br /> Fonte- Blue Flaming Lake <br /> . ne lle Navajo Mesa Gorge Pu'w'e 11 <br />Unadjusted most probable 650 <br />forecast 1,200 780 1,900 6,900 <br />Transmountain diversion <br />and storage changes in Y-lO 'ij-600 <br />amall project reservoirs None - L<O - 10 <br />Adjusted most probable 640 1,890 8,300 <br />forecast 1,200 ,00 <br />Deviation from most proba- <br />ble forecast 1/ +280 <br />90 percent +350 +300 '300 :,3,100 <br />50 percent +110 ~230 +130 ~130 :,1,100 <br />Percent of 1906-68 inflow -138 94 -82 163 100 <br /> <br />Y Does not reflect storage changes at Fontenelle Reservoir. <br /> <br />S! Does not reflect storage changes at FlaminC Corge, Navajo, <br />Morrow Point, Blue Mesa, and Fontenelle Reservoirs. <br /> <br />11 Percent of the time actual runoff will not deviate from the <br />most probable forecast more than the amount shown. <br /> <br />Lake Powell forecast is derived from a summation of three tributary <br />forecasts: The Green River at Green River, Utah; the San Juan River <br />at Bluff, Utah; and the Colorado River near Cisco, Utah. Each of the <br />tributary forecasts is derived by correlation of the .~pri1-through-July <br />runoff (adjusted for major diversions and storage changes) with the <br />previous October-through-February precipitation and ~mxch 1 water <br />e'l.ui'la.lent of snow. Data from 58 precipitation stations and 50 snow <br />courses located throughout the basins are used. <br />