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<br />(: .13 :. <br /> <br />REVIEW OF CERTAIN SAFETY ASPECTS OF <br />FEASIDILITY STAGE DESIGN OF <br /> <br />PROPOSED NARROWS DAM, COLORADO <br /> <br />lliTRODUCTION <br /> <br />The following report presents observations made and conclusions drawn from a <br />review of pertinent data, documents, and drawings, together with a one-day site inspec- <br />tion and a half-day briefing session, all focused on the investigations for, and the cur- <br />rent design of, proposed Narrows Dam. The purpose of these activities has been to de- <br />velop an assessment of the competence of the foundation of the proposed dam and the <br />adequacy of the proposed design of the dam. In the conte.'Ct intended, the assessment is <br />restricted to the principal structural and geotechnical features of the proposed cross <br />section of the dam, and of its foundation, in regard to their adequacy against possible <br />catastrophic failure due to natural or operational events. The assessment does not in- <br />clude consideration of such important features of the overall design as the spillways and <br />the outlet works. Additionally, the assessment does not include evaluation of planning <br />concepts such as economics, water supply, reservoir operation, flood control criteria, <br />and general benefits, but accepts statements provided on these matters at face value. <br />TERMS OF REFERENCE <br />The undersigned consultant, retained through the firm of Thomas M. Leps, Inc., <br />was authorized by United States Department of Interior's Bureau of Reclamation Pur- <br />chase Order No. 8 07 DP 00215, dated December 5, 1977, to prepare this review report. <br />An oral report was made at the Bureau's Denver E. and R. Center on January 10, 1978. <br />The following report includes the benefit of exchange of views during that meeting. <br />It was understood, as between the Bureau and Thomas M. Leps, Inc., that the <br />time available for reviewing the extensive accumulation of investigations, studies and <br />reports on the Narrows damsite, accumulated over more than 30 years, was limited by <br />its early need for an independent review. Hence, it should be accepted without reserva- <br />tion that the judgments expressed in the follOWing report have had to be bused on selec- <br />tive sampling of the voluminous records, based on experience in discerning what may <br /> <br />1. <br />