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. . , .' - 6 - by the Colorado.,Big Thompson project, on the stream flows at critical points such as the Shoshone power plant and the Cameo gage determine the time and amount of replacement required in order to meet the demands of senior appropriators. Our engineering staff has made some estimates of potential diversions from the Blue River and from the Williams Fork with the presently constructed collection system for the Jones Pass tunnel. Before our studies had progressed further, Denver made the amended filing on the Williams Fork Reservoir and made known the intention to enlarge the reservoir to its full capacity of 93,637 acre feet. As a matter of information as to the general magnitude of the replace- ment storage wrich might be required, we made a rough operation study for the reservoir with that total capacity. The inflow to the reservoir was estimated to be about 90,000 acre feet for the average year of a period such as 1934-1954, with the Jones Pass tunnel diverting to the limit of the present1y constructed ,lOrks. It was assumed that the reservoir would be empty at the end of the 1934 water year. Williams Fork water was considered storable at times when such storage would not conflict 1.-1ith the senior right of the Shoshone power plant. Replacement was made in the operation study for historic Moffat tunnel diversions and potential diversions from Blue River and through Jones Pass tunnel within the limit of the present works, in conjunction ,~th potential Colorado-Big Thompson depletions. Under the assumptions of the study it was found that storable water averaged about 63,000 acre feet, and spills would occur in 13 of the 21 year period, averaging 17,000 acre feet. The average replacement furnished for the uses mentioned would be about 47,000 acre feet <lith a maximum requirement of about 70,000 acre feet in anyone water year. The reservoir content by the oc;l..O