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" 0.....i....... \: .) G.",) ,.-., .,:/' ~ ~! tJf!X ~ a;;~ ~. ~ C!) , ~ (;3 @ .. Q> ~ .C . "c..., 'i . .' i i f?'.....,' I '-9' t(Q R \Y' f.?~ '(li 1 r-:. }"- ~ ;C. ., , c- ie. L L L Proc. No.: W-G-1 Date: June 1979 Item: ,~r;:;l~~W~1m~. WESTERN DIVISION OPERATIONS PROCEDURES MANUA~~..r."Jltl:')~-"::1-~_':cl.' \. ~ . HII, C) i "', ,\1 WATER OPERATIONAL PROCEDURES \\', H.'~,.. ~ ~..~,f ~~.-;-:';;C;I;y;nW All}: '. .1\11'. ,,"- '\0) \.., ~ '- . "I"'l'(~\\' ['1.,\;" OPERATION OF LAKE GRANBY RESERVOIR c:.:.. .'> ~. Procedures: Releases from Lake Granby to the Colorado River generally will be limited to the amount required by the Secretarial Determination dated January 19, 1961. Unless advised to the contrary, the release from Lake Granby will be 20 ft3/s from October 1 through April.30, meas- ured at the gage immediately below Granby Dam. Minimum required releases during the May 1 - September 30 period are based on maintain- ing certain discharges at the gaging atation below the Coffee-McQueary Ditch, but are ~ubject to adjustment based on forecasted inflows, The minimum required flow will be furnished operating personnel by the Water Scheduling Division, Changes in the miniu.um required releases are specified at the end of the month. To avoid unnecessary overtime, changes will be made on Friday if the end of the month is Saturday, and on ~bnday if the end of the month is Sunday. Releases through the spillway will normally be scheduled by the Water Scheduling Division,. In the absence of specific instructions, bypass of water in excess of fish requirements ~Qall be made when the waler' surface elevation of Lake Granby reaches/Bt79.5-. Releases will be made to maintain the elevation by releases through the 30-inch hollow-jet valve up to the capacity of the valve before raising the spillway gates, The rate of increasing releases through the valve and warning downstream inhabitants will be at the discretion of the Chief, West Slope Area Branch. If Lake Granby water surface continues to rise after the 30-inch valve is completely open, both spillway gates will be raised .1 foot. This will increase the outflow from about 430 ft3/s to 530 ft3/s. The spillway gates will be raised in ,1-foot intervals with each ,1-foot rise in water surface elevation to prevent overtopping the gates.. When the water surface elevation reaches 8280, the gates will be raised as required to prevent exceeding this elevation. The water surface must not be permitted to exceed 8280,3 feet to prevent damage to property abutting on Lake Granby. . As inflow recedes, the gates will not be lowered until the water surface elevation EXHIBIT 27