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. o CHAPTER I - JI'I,'TRQDUCTION SllJDY AUlHORITY Authority for this study is contained in a resolution by tile Committee on Public Works of the United Stales Senate, adopted 9 May 1963, which reads as follows: "Resolved by the - Committee on Public Works of the United Stales Senate, that the Board of Engineers for Rivers and Harbors, created under Section 3 of the River and Harbor Act,approved June 13,1902,be,and is hereby, requested to review lIlc reportS of the Chief of Er:gineers on the t.fissouri River and Tributaries, published as House Document numbered 238, seventy-third Congress; House Document numbered 475, seventy-eight Congre.~s; and other pertinent reports, with a view to determining whether the c,isling proj&l should be modified in any way at the present time in the interest of flood control, navigation, hydroelectric power, water supply, water quality .conlrol, drainage, recreation, fish and wildlife development, and allied purposes, coordinated with development ofrelatcd land resources. SnrDY PURPOSE AND SCOPE The purpose of this study was to evaluate flood problems along Boxelder, Spring, and Dry Creeks in the Fort Collins, Colorado, area. Severa! previous studies of the fluud problems on !k>",eider, Spring, and Dry Creeks have been completed which had an effect on the scope of this S1udy. J.J r - . Studies conducted by the City of Fort Collins on Boxelder Creek in the early 1980'sindicale structural mea5ures would be infeasible by wide margins, and the limited cllanges in flood plain development since thaI time did not wanant a full reconnaissance.]evel reevaluation of the flood problems on Bo",e]dcr Creek. Studies conducted on Spring Creek in 1988 by the City of Fort Collins indicated flood control measures would be feasible in some reaches of Spring Creek, and the City lias constructed flood control measures between College Avenue and the Burlington Northern Railroad (BNRR). Consequently, the scope of this study was reduced loan evaluation of the flood problems on Dry Creek, and included only a cursory review and update of the flood problems and potential solutions on Boxe1der and Spring Creeks. The studies conducted were of reconnaissance scope and wen:: conducted in sufficient det:1i1 todctermine if there is at leas: one erlVrron:nent:1l.I)' ane! economical- ]y feasible solution 10 the flood problems on Dry Creek. These studies were based on information from previous engineering studies, available mapping and other existing data, general field inspections, and judgment based on standard engineering practices. A new hydrologic analysis for Dry Creek was completed. Additional field surveys, topographic mapping, and engineering and economic data which were obtained were sufficient for development ofra::onnaissance-Ievel designs and cost estimates. PRIOR SnrDlES There have been numerous flood control studies and reports completed for the City of Fori Collins by consulting firms and Feder.d agencies, including the Federal Emcrgcncy Managcmcr.: Agcncy (TTMA). Table I-I presenls .. list of tl1e most j.2 .