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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 />IRRIGATION DITCHES <br /> <br />Two irrigation ditches cross the drainageways in the study <br />area. The Nevada Ditch parallels the South Platte River <br />approximately 1,500 feet east of Platte Canyon Road. The <br />Platte Canyon Ditch roughly parallels Platte Canyon Road. At <br />the present time, drainage from the study area flows into the <br />Nevada Ditch and Platte Canyon Ditch and causes flooding <br />problems. <br /> <br />HOMEOWNERS ASSOCIATION <br /> <br />During a meeting with the local homeowners association, local <br />residents expressed their ideas and experiences regarding <br />drainage problems. Specific drainage problems are referred to <br />in Chapter 5. <br /> <br />The residents are primarily concerned with erosion, mainten- <br />ance and the general unsightliness of some existing channel <br />reaches. They would like to have all the drainage facilities <br />out of sight (underground conduits) if possible. Erosion on <br />the North Tributary to Basin 6200 was stated to be the primary <br />concern. Also, the flooding problem at Hinsdale Avenue and <br />Platte Canyon Drive was presented as being a serious recurring <br />problem with substantial threat to the homeowners. <br /> <br />SOILS <br /> <br />The soil in the study area is of the Fondis and Weld associa- <br />tions. The surface soil is clayey material overlying a sandy <br />subsoil. The soil is generally stable for flood channels with <br />the exception of potential erosion from high velocities experi- <br />enced in the North Tributary of Basin 6200. <br /> <br />The soil is suitable for grass-lined channels if the veloc- <br />ities are held below 7.5 feet per second. <br /> <br />FLOOD ELEVATIONS <br /> <br />The South Platte River water surface for the 100-year flood <br />has been established by the U.S. Corps of Engineers. For <br />Basin 6100, the elevation is 5,353.0 feet; for Basin 6200, the <br />elevation is 5,370.0 feet. For the standard project flood in <br />Basin 6100, the flood elevation is 5,357.0 feet; in Basin 6200 <br />the elevation is 5,373.0. Flood water surface elevations were <br />sketched from "Flood Plain Information Report, Metropolitan <br />Region Denver, Colorado, Volume I," Corps' of Engineers, October 1913. <br /> <br />HISTORICAL DRAINAGEWAYS <br /> <br />The area's steep slopes and other natural topographic features <br />have established well-defined patterns of historical drainage. <br />From USGS quadrangle maps, the historical drainageways can be <br />determined, as shown on Figure 3-2. <br /> <br />3-5 <br />