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<br /> I <br /> I <br /> 1 <br /> I <br />, i' <br />.' I <br /> !i <br /> !I <br /> 'I <br /> ", <br /> ;1 <br /> :1 <br /> d <br /> <br /> I' <br /> , I <br /> II <br /> 'I <br /> 'I <br /> I <br />, I <br />~ I <br />...., ,I <br /> I <br /> <br />,I <br />I <br /> <br />. <br />'. ,'I <br />. <br />'\ <br /> I <br /> ;1 <br /> ; <br /> " <br /> :1 <br /> !I <br /> <br />------- -- <br />---------- <br /> <br />dam and to a point of exit along the south side of the river <br /> <br />east of the dam site. <br /> <br />It is possible that the top of flood stor- <br /> <br />age was set at 4414 with the awareness that the bed elevation of <br /> <br />Bijou Creek is close to this elevation and any consistent stand <br /> <br />of Narrows Reservoir water above 4414 could bring about a ground <br /> <br />water gradient toward the Bijou channel and result in a great in- <br /> <br />crease of seepage in that direction and a flow in Bijou Creel, <br /> <br />from this seepage. <br /> <br />Ground water on the left abutment of the Narrows Dam is <br /> <br />negligihle because of the small amount of overburden and the im- <br /> <br />pervious nature of the bedrock. Bedrock is 50 shallow in the <br /> <br />present river channel that it's cutoff by construction of the dam <br /> <br />is a simple matter. Therefore, the principal problems of seepage <br /> <br />at Narrows arc confined to the right abutment area. The U. S. <br /> <br />Bureau of Reclamation made extensive analysis to determine what <br /> <br />this seepage would be and what would have to be done to insure <br /> <br />stability of the dam and to reduce the seepage to an amount that <br /> <br />could be lived with. Their studies indicated that seepages wou Id <br /> <br />be in the range of 27 to 48 cubic feet per second and that to keep <br />---- - <br /> <br />the seepage rate down, a broad upstream, right abutment clay <br /> <br />blanket and extensive toe drains or a combination of both, would <br /> <br />be needed. The results of their study are contained in a report <br /> <br />entitled, "Narrows Dam Water Loss Studies". <br /> <br />That seepage losses will be large is also indicated by the <br /> <br />losses in irrigation canals and reservoirs of area over the past <br /> <br />years. The Bijou No.2 Reservoir, located at the cast ~nd of the <br /> <br />Narrows axis, as mentioned above, and Thlpire Reservoir located <br /> <br />upstream from the Narrows axis and south of the proposed reservoir, <br />