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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The flood hazards in the reach consist of erosion, debris removal <br /> <br />which has an average slope of 5.5% through the reach, passes through <br /> <br />and cleaning, deterioration of the street, and a low life hazard due to <br /> <br />the shallow high velocity flow, <br /> <br />2. Station 533+00 to 453+00, Virgini~ Drive to 6th Avenue (Sheets <br />30, 31, & 32) <br /> <br />a small erosion control dam (Station 103+00) without an emergency <br />spillway. The flood plain is generally contained within the channel <br />area, with high velocity flow. <br /> <br />The flood hazards in the reach consist of erosion, debris removal and <br /> <br />The channel in this reach varies from a broad trapezoidal section <br /> <br />at 6th Avenue to a narrow V-shaped section for the remainder of the reach. <br />A portion of the channel through the 6th Avenue West development has been <br />improved including the reconstruction (with spillways) of the two detention <br />ponds. The average slope through the reach is 2.5%, The channel is crossed <br />by 6th Avenue in a 108" CMP and by Maple Avenue with a 36" RCP, <br />The channel has two tributary drainageways which contribute storm <br />runoff, one at station 472+00 from the college area (A 44 acres) and one <br />along the Frontage Road (Station 461+00, A = 148 acres). Both tributary <br />channels are deeply incised and severely eroded. <br />The flood plain is contained within the channel area. No development <br />has encroached on the channel area. The flood hazards in the reach <br /> <br />cleanup, and a low to moderate life hazard due to the high velocity flow. <br /> <br />~Stati9n 68+0010 47+00, South Bounda~Jefferson_~ounty <br />Fairgrounds to 6th Avenue, (Sheets 35 & 36) <br /> <br />The channel in the lower portions of this reach consists of a <br /> <br />24" CMP and 30" RCP sewer and a broad overland flow area. In the upper <br /> <br />portions of the reach, the channel is a V-shaped section with a broad <br /> <br /> <br />overbank flow area. The reach is entirely within the Jefferson County <br /> <br />consists of erosion, debris removal and cleaning, and a low to moderate <br /> <br />Fairgrounds and has an average slope of about 3.6%, <br />The channel is crossed by 6th Avenue and the Fairgrounds' road at <br />the south boundary. The capacity of the 30" RCP storm sewer is less <br />than the 2 year frequency storm, <br />In the upper portions of the reach, the flood plain is generally <br />contained within the channel, In the lower portions, however, the flood <br /> <br />life hazard due to the high velocity, moderate depth channel flow. <br /> <br />peaks exceed the sewer capacity and shallow overland flow occurs down to <br /> <br /> <br />6th Avenue. Due to the limiting capacity of the 6th Avenue culvert, the <br /> <br />G, Drainageway G <br />Drainageway G is a right bank tributary to Lena Gulch draining the <br />northern flank of Green Mountain. <br /> <br />1. <br />Fair <br /> <br /> <br />Jefferson County <br /> <br />flood peaks "spl it" from the main channel and flow east to Indiana Street. <br />In addition, flow splitting also occurs in Drainageway G-3 and H-2 at 6th <br />Avenue to the west. These flows also follow along 6th Avenue and combine <br /> <br />The channel in this reach varies from a broad V-shaped section <br /> <br />with the flood peaks in this reach, <br /> <br />to a more narrow trapezoidal section in the upper reaches, The channel, <br /> <br />16 <br />