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<br /> <br />1116 <br /> <br />wildlife and recreation purposes. The ~inter Water Program was initiated <br />on December 1, 1975, and will be part or the non-Project water regulated <br />in Pueblo Reservoir. <br /> <br />. <br /> <br />The purpose of this report is to provide a basis for increased cooperation <br />and understanding among all concerned with the coordinated operation of <br />the Project. <br /> <br />The report has two main parts. <br />actual operations through water <br />plans for water year 1976. <br /> <br />The first part reports the results of <br />year 19~5. The other presents operating <br /> <br />In establishing the general plan for future operations, three possibil- <br />ities are considered: (1) a reasonable maximum water supply which might <br />be expected; (2) a reasonable minimum water supply; and (3) the most <br />probable water supply. These three conp.itions of water supply are derived <br />by statistical analysis of historical w~ter supply data. Statistically, <br />the actual runoff has a l-in-10 chance ~f being less than the reasonable <br />minimum and a l-in-lO chance of being greater than the reasonable maximum. <br />Annual inflow of a magnitude equaled or' exceeded 50 percent of the time <br />is considered the most probable supply., Exhibit 1 illustrates the proba- <br />bility curves used. Once established, however, the Annual Operating Plan <br />does not remain rigid. From time to time revisions are made as new <br />information becomes available. <br /> <br />. <br /> <br />Ruedi Reservoir had 92,983 acre-feet of storage on October 1, 1974. <br />Operation of the reservoir through November 15 was in compliance with <br />a request by the Fish and Wildlife Service for enhancement of brown <br />trout spawning. The flow below Ruedi Dam was held to about 100 c.f.s. <br />from October 1 through November 15. In: order to attain maximum flood <br />control, the reservoir was drawn down tp a point where refilling would <br />be assured under reasonable minimum inf:low conditions. From November 16 <br />through January 22 the outflow averaged about 160 c.f.s. and from <br />January 23 through March 1 about 109 c.;f.s. The outflow was reduced <br />to the 109 c.f.s. in order to meet the levels projected in the Annual <br />Operating Plan. On March 1, 1975, the reservoir content was 62,347 <br />acre-feet. <br /> <br />Based on the runoff forecast made from iMarch 1 snow survey data, the <br />Ruedi Reservoir release was adjusted to; 158 c.f.s. on March 5th. <br /> <br />, <br />The runoff forecast made with April 1 s~ow survey data indicated that <br />the outflow from Ruedi Reservoir shoulp. be about 220 c.f.s. for the <br />month of April. However, the inflow was low, and the reservoir water <br /> <br />. <br /> <br />2 <br />