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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />0951 <br /> <br />The purpose of this report is to provide a basis for increased cooperation and <br />understanding among all concerned with the coordinated operation of the project. <br /> <br />The report has two main parts. One part reports the results of actual operations <br />through water year 1971. The otherpresents operation plans for water year 1972. <br /> <br />In establishing the general plan for future operations, three possibilities are con- <br />sidered: (1) a reasonable maximum water supply which might be expected, (2) a <br />reasonable minimum, and (3) the most probable supply. These three conditions <br />of water supply are derived by statistical analYSis of historical water supply data. <br />Statistically, there is one chance in ten that the actual runoffwiIl either be greater <br />or less than the volumes indicated as reasonable maximum and reasonable mini- <br />mum. Annual inflow of a magnitude equaled or exceeded 50 percent of the time <br />is considered the most probable supply. Exhibit 1 illustrates the probability <br />curves used. Once established, however, the Annual Operating Plan does not <br />remain rigid. From time to time revisions are made as new information becomes <br />available. Flexibility is a keynote of the plan. <br /> <br />Report on Operations during Water Year 1971 <br /> <br />Ruedi Reservoir <br /> <br />Ruedi Reservoir had 99,475 acre-feet in storage on October 1, 1970. <br /> <br />During the winter months, Ruedi Reservoir was operated essentially as envisioned <br />in the 1971 outlook. Operation of the reservoir through November 15 was in com- <br />pliance with a request by fish and wildlife interest. Releases from the reservoir <br />were held to 100 c. f. s. for the period October 1 through November 15. Then, in <br />order to provide maximum flood protection below the dam, the reservoir was <br />drawn down to a point where refilling by July 1 would be assured under reason- <br />able minimum inflow conditions. Outflow during this drawdown period ranges <br />from 180 to 200 c. f. s. At the end of March 1971 there was 61,329 acre-feet in <br />storage. The 1971 operating plan projected an end-of-month content of 61,400 <br />acre-feet for March. <br /> <br />storage was to have begun immediately under the minimum inflow conditions, <br />but under most probable and reasonable maximum inflow conditions further draw- <br />down was anticipated. Under these two conditions the 5-feet-per-week drawdown <br />criteria controlled and the minimum anticipated storage was 47,500 acre-feet by <br />the end of April. <br /> <br />The April 1 snow surveys and subsequent runoff forecast indicated that the reser- <br />voir could be drawn down further with the assurance of refilling by July 1, 1971. <br /> <br />5 <br /> <br />