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<br />C': ~ ,') r: <br />,~.:..v <br /> <br />FLOOD DAMAGE ANALYSIS <br /> <br />A flood damage analysis vas made generally in accordance <br />with the Principles and Standards. <br /> <br />Reconnaissance investigations and post-flood damage surveys <br />:In the Lower South Platte River vere available from prior reports <br />and from previous studies made for the Bureau of Reclamation in <br />connection vith the Narrows project. These studies included a <br />.' <br />compilation of flood histories and estimates of flood damages. <br />The data developed in these studies vere supplemented by periodic <br />field reconnaissance of the flood plain to determine the number <br />and type of improvements added to the flood plain since the <br />previous survey and to determine the existing land use patterns. <br /> <br />Flood damage evaluations for various stream reaches for <br />existing conditions and for conditions vith the Narrows Dam <br />operation included the development relationships and discharge- <br />damage relationships and combining these to obtain damage- <br />probability relationships and average annual damages. <br /> <br />,/ <br /> <br />sruDY REACHES <br /> <br />For the purpose of analyzing flood damages and flood control <br />benefits for the Narrows unit, the affected area along the Lover <br />Sou:t:h Platte River vas divided into four reaches. These reaches <br />were selected on the basis of economic development and hydraulic <br />characteristics. The locations of the study reaches are shown <br />:In table 7. General location of the study reaches are shown on <br />plate 1. <br /> <br />14 <br />