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Reach A, A grass-lined improved channel is required throughout the reach to handle 2,700-cfs, with expanded culverts under all ro~d~ay crossings, i~cluding Meadow Lane and Highway 287. Reach B: A siphon was used to carry the Larimer and Weld County Canal beneath the improved Dry Creek channel. No channel exists south of the canal for I,OOO-feet and in this area, one home and several mobile homes would be relocated to make room for channel improvements. An improved culvert to pass 2,700-cfs is required through the College Avenue area. A grass-lined bypass channel with a culvert under LeMay AVenue is required in the vicinity of the Alta Vista community. Reach B: At the Larimer and Weld County Canal, the flow is diverted to a new channel to the poudre River bypassing Dry Creek. The canal was placed in a siphon and two new culverts were required for the Union Pacific Railroad and Willox Lane. An improvcd culvert was designed to replace those existing upstream and downstream of College Avenue and a bypass channel around the Alta Vista area is required with a new box culvert under LeMay Avenue. Reach C: An improved grass. lined channel designed for the residual lOa-year flow is required through the Valley Airpark area and south of Highway 14 to the poudre River. culvert improvements for the airport runway and two lccal streets and a siphon for the Cache la poudre Reservoir Inlet Canal were alsO included. This Reach C alternative is identical to Reach C improvc~ents for Alternative Jll. Reach C: A concrete-lined channel is required to convey 2,700-cfs through the Valley Airpark area and south of Highway 14 to the Cache la poudrc River. Again, culvert improvements would be included at two local street crossings and Highway 14. The Cache la poudre Reservoir Inlet Canal was routed through a siphon under Dry Creek. Alternative ,4 AltcJ:native !!3 The lO-year flood event was the design event for this alternative. The channel and culverts in Reach A were improv~d to carry the la-year storm, which is then diverted at the Larimer "flU Weld County canal in a ::;han:"lcl to the PO'.Idr", River. Channel improvements below the canal were sized to handle residual 10-year flows. This alternative again was u<osigned for the lOa-year flood event. Channel i~prove~e~ts consisting of grass and concrete-lined chann('ls are rec:uired throughoClt the rench tor" design flow of 2,700-cf5. Reach A: The existing channel in this roach is adequate to carry the la-year event with improvements noeded only to the culvert under Meadow Lane. Reach .,,: Channel lroprovemcnts consisting of " grass-lined channel were de5ia~eG to eo~tain 2.700-cfs thro~g~ this reach. Improved culverts are r.,quLrod under ~\c"do'~' Lane and Hi'l~w,~y 287. ReaCh B: The la-year flood event is diverted near the Larimer- Weld Canal crossing into a grass-lined cha~nel south to the Poudre River. The diversion includes a culvert under Willcx Lane. This diversion also includes a siphon under the canal to separate canal fluw:;; from DJ:Y Creek. ~o improvements are required through CnlJ~ge Avenue. O~ly minor overflows are anticipated to result from -27- -28-