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<br />. <br /> <br />117S <br /> <br />spot measurements. After May 1968, when storage began in Ruedi Reservoir, <br />the actual inflow was oorrputed by measuring the outflow and the change <br />in storage. Upstream transrrountain diversions were added back to the <br />reservoir inflow to give the undepleted inflow to Ruedi Reservoir. <br /> <br />A probability curve for Ruedi I s undepleted inflow was computed by the <br />Log Pearson method and is shown graphically on Exhibit 1. Annual inflow <br />of a magnitude that is equaled or exceeded 50 percent of the time was <br />oonsidered the lIDst probable inflow, that with a 90 percent chance of <br />being equaled or exceeded was (xmsidered to be the reasonable minimum, <br />and that with only a 10 percent chance of being equaled or exceeded was <br />ronsidered the reasonable maximum. '!he October through March inflow was <br />the average 1960 through 1974 inflow for this period. After October <br />through March inflow was subtracted, the remainder was distributed anong <br />the lIDnths of April through September according to the distribution of <br />the mean undepleted inflow. From the undepleted inflow, the corresponding <br />transrrountain diversions were subtracted. '!he transrrountain diversions <br />were the lIDst probable, the reasonable minimum, and the reasonable <br />maximum values for Busk-Ivanhoe and Charles H. Boustead Tunnel diversions <br />as detennined by probability studies, Exhibit 2. Storable inflow was <br />oonsidered to be the resulting depleted inflow less bypass for the <br />protection of recreational values, including fishing on the Fryingpan <br />River below Ruedi Reservoir. <br /> <br />. <br /> <br />Minimum Reservoir Release <br /> <br />'!he bypass, not to exceed the stream3inflow, is 39 ft3/s for the I1Dnths <br />of November through April and 110 ft /s for May through October. <br /> <br />Reservoir ~ration <br /> <br />The runoff above Ruedi Reservoir in 1977 was about 25 percent of nonnal, <br />and as a result, Ruedi Reservoir did not fill as planned. A maximum <br />reservoir content of 86,400 acre-feet was reached on June 30, 1977, <br />and was 16,000 acre-feet short of filling. '!he 1978 operation of Ruedi <br />Reservoir mntenplates the ronservation of water in anticipation of <br />another dry 3year . The release from the reservoir will be maintained at <br />about 50 ft /s until January 1, 1978. Based upon the type of runoff <br />season indicated by the January 1 snow pack data, the outflow from Ruedi <br />will be adjusted acoordingly. 'Ib provide maximum flood protection below <br />the dam, the reservoir will be drawn down by March 31 to a point where <br />refilling V/Ould be assured during the spring runoff. Estimates of <br />probable inflow will be made in February and March when actual oondi tions <br />beccm3 known from the February 1 and March 1 snow forecasts, and the <br />drawdown will be adjusted acoordingly. <br /> <br />~st Slope recreation interests requested that the reservoir water level <br />not be drawn down below elevation 7706.0 (53,122 acre-feet), which is <br /> <br />. <br /> <br />9 <br />