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I J " I, I I I I I I I I I I I I I , I I SECTIONTWO Alternatives Considered Area Improvements facilities discussed under Alternative 2. All components of the alternative would be sized to handle 5,000 cfs of flood flows (projected 100-year flood event) and includes the following: . Construction of a I ,500-foot-Iong by 50-foot-wide by 5-foot-high benn to the north and east of the Riverside Cemetery . Lowering a 300-foot section and raising an 800-foot section of CR 24 . Construction of a 500-foot-long by 75-foot-wide channel with a concrete floodwall north of the cemetery; the floodwall would be sized to allow 3 feet of freeboard . Building and installation of a closure structure for Highway 6 that is sized to allow 3 feet of freeboard. This temporary structure would be the sanle design and have the same operational requirements as described in the previous alternative. . Construction of eleven 20-foot by 4-foot box culverts under the UPRR embankment . Installation of a siphon under the new flood channel for the Sterling No.1 Ditch . Construction ofa 7,000-foot-Iong by 250-foot-wide flood channel from the UPRR embankment to the South Platte River . Modification of two private drives and one minor county road by creating gradual depression in road grade within the constructed channel, hardening the road surface within the constructed channel, and installation ofa low-flow culvert within each of the road grades to convey low flows across the county road and two driveways . Construction of a riprap-protected drop structure where the constructed flood flow channel discharges to the South Platte River. Design features of the drop structure would be the same as discussed for Alternative 2. Photographs ofIocation of the flood channel and the UPRR embankment at the Riverside Cemetery location are provided in Exhibits 7 and 8. 2-5