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<br />I <br /> <br />OC1754 <br /> <br />- 12 - <br /> <br />I <br /> <br />I <br /> <br />There are no other known county, state or Federal water resource <br />developments that will be affected by the works of improvement <br />included in this plan. <br /> <br />I <br /> <br />I <br /> <br />BASIS FOR PROJECT FORMULATION <br /> <br />I <br /> <br />The objective of this plan is to provide protection frem <br />floodwater and sediment damages to: (1) agricultural lands in the <br />overflow area and (2) residential, commercial, and municipal <br />properties within the Town of Limon, <br /> <br />I <br /> <br />The area needing protection lies within or immediately <br />adjacent to the Town of Limon. All of the principal damage area <br />is included within the watershed boundaries. (See Project Map and <br />Darc.age Map). <br /> <br />I <br />I <br />I <br /> <br />The providing of a satisfactory level of protection to the <br />area subject to damage involves the control of large volumes of <br />floodwater with high peak flow resulting from suroIT.er storms of <br />high intensity rainfall. The optimum long-term security fram this <br />floodwater damage is obtained by the installation of large floodwater- <br />retarding reservoirs on the three tributary streams above the Town <br />of Limon, These structures will reduce a one percent chance peak <br />flow at the Main Street highway bridge of 2,620 c.f,s, to a non- <br />damaging in-channel flow of 560 c,f.s, <br /> <br />I <br />I <br /> <br />A continued program of improved soil and water conservation <br />through the application of land treatment measures on the state <br />and privately-owned agricultural lands above the principal <br />floodplain damage areas is needed, <br /> <br />I <br />I <br /> <br />To attain the project objectives, the level of protection and <br />the kind and intensities of studies to be undertaken during <br />preliminary and detailed planning phases were agreed upon with the <br />sponsors. The first consideration was for two floodwater-retarding <br />structures and channel imprOVEment, <br /> <br />I <br />I <br />I <br /> <br />Preliminary investigations indicated that with only two <br />floodwater-retarding structures, the main channel below the highway <br />bridge would require extensive realigning and enlarging together <br />",1th enlargement of the railroad bridge. When these costs and the <br />level of protection were considered, it was determined that a third <br />floodwater-retarding structure would assure a higher level of <br />protection for a longer period of time for approximately the same cost, <br /> <br />I <br />