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<br /> <br />1069 <br /> <br />The purpose of this report is to provide a hasis for increased <br />cooperation and understandinr- among all concerned with the coor- <br />dinated operation of the proiect. <br /> <br />. <br /> <br />The report has two main parts. One part reports the results of <br />actual operations through water vear 1974. The other presents <br />operation plans for water year 1975. <br /> <br />In establishing the general plan for,future operations, three possi- <br />bilities are considered: (1) a reasonable maximum water supply <br />which might be expected, (2) a reasonable minimum, and (3) the <br />most probable supply. These three conditions of water supply are <br />derived by statistical analysis of historical water supply data. <br />Statistically, the actual runoff has,a l-in'-lOchanceof being less <br />than the reasonable minimum and l-in~lO chance of being greater than <br />the reasonable maximum. Annual infl~w ofa magnitude equaled or <br />exceedeci 50 percent of the time is considered the most probable supply. <br />Exhibit 1 illustrates the probabilitv curves used. Once established, <br />however, the Annual Operating Plan does not remain rigid. from time <br />to time revisions are made as new information becomes available. <br />flexibility is a keynote of the plan. <br /> <br />Report on Operations During Water Year 1974 <br /> <br />Ruedi Reservoir <br /> <br />Ruedi Reservoir had 96,193 acre-feet' of storage on October 1, 1973. <br />Operation of the reservoir throu1l;h Nbvember15 was in compliance <br />with a request by State and Federal Fish and Wildlife representatives <br />for the enhancement of brown trout spawning. Releases were maintained <br />around 100 c.f.s. until November 15. Then, in order to attain maximum <br />flood control benefits, the reservoir was drawn down to a point where <br />refilling would be ~ssured under reisonable minimum inflow conditions. <br />During this period of:drawdown the r,elease from Ruedi Reservoir aver- <br />aged 180 c.f.s. On the 1st of March 1974, there were 62,136 acre-feet <br />in storage. <br /> <br />. <br /> <br />Based on the forecast derived from the March 1 snow survey, the Ruedi <br />Reservoir release was maintained at 180 c.f.s. during March. <br /> <br />Based on the April 1 snow survey forecast, the release was to have <br />been 147 c.f.s. during April; howev$r, the inflow was not increasing <br />and it appeared that the reservoir level would drop below elevation <br />7706, therefore, the outflow was reduced to 65 c.f.s. to prevent <br />any further ranid drawdown of the reservoir. <br /> <br />tHnimum storar;e of 53,029 acre-feet was reached on April 16, ,dth <br />the water surface 1. 86 feet a]-,oVe the bottom of the Forest Service <br />boat ramp. As the inflow started to increase near the end of April, <br />the outflow was incrementally increased to 310 c.f.s. by April 30. <br /> <br />. <br /> <br />2 <br />