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<br />The estimated cost of improving the channel and replacing the <br />bridge is $436,290. The corresponding annual costs and benefits are <br />$38,l80 and $27,291, respectively, The resulting benefit-cost ratio <br />is 0.71. <br /> <br />The breakdown of quantities used to obtain these cost estimates <br />may be found in appendix B, <br /> <br />LEVEES <br /> <br />Two levee alternatives were considered in this report: a levee <br /> <br /> <br />protecting the entire town from Elm Creek flooding and a levee to <br /> <br /> <br />replace the existing ring levee around the southwest corner of town to <br /> <br /> <br />protect the town from both Shell Creek and Elm Cre~ flooding. <br />'. <br /> <br />Because of technical as "ell as economic constraints, a levee <br /> <br />alignment along both sides of Elm Creek was ruled out as a practical <br /> <br /> <br />solution. To provide enough 'right-of-way for 'an Elm Creek levee <br /> <br /> <br />alignment, at least six structures would need to be removed from the <br /> <br /> <br />flood plain, which is a costly process, In addition, a minimum of <br /> <br /> <br />three closure structures would be required--cwo at Main Street and one <br /> <br /> <br />at the UPRR bridge crossing Elm Creek in Platte Center. Also, because <br /> <br /> <br />of thf limited warning time prior to flooding in Platte Center. local <br /> <br /> <br />offic'ials would not have enough time :ta':~install the' c;losure <br /> <br /> <br />structures. <br /> <br />Because the cost of such an alignment would be over $530,000 with <br />the resulting annual costs and benefits producing a benefit-cost ratio <br />of less than 1.0, this alternative is not only technically <br />il!Jpractical, but economically infeasible, The cursory breakdown of <br />- <br />costs for this alternative is shown in appendix C. <br /> <br />21 <br />