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I I I I I I I I I I I I I I I I I I I conveyance. A raised flume will be constructed across the Windsor Canal. Discharge will continue south along Sixth Street. Improvements to the borrow ditches and new street crossing structures are needed to complete the design concept. During the design analysis, it was assumed that during the 100-year precipitation event that the street crown can be over topped with I-foot of water. This is a reasonable assumption and common design practice used by numerous communities along the Colorado Front Range. This alternative continues to have floodplain along County Road 7 and 6th Street. The floodplain is reduced but not eliminated from the planning area Furthermore, this alternative requires cooperation of the Windsor Canal owners. The canal owners are on record as being opposed to this design concept. 5) Alternative Five - Undetained Diversion to Boxelder Creek Alternative five is the preferred alternative because it provides a multi-use project that minimizes flood hazard, provides a bicycle/pedestrian trail, protects wetlands, improves traffic safety and meets the comprehensive plan requirements of open-space. The Construction Loan request is for the flood control portion of the project. Cost Estimate projections are provided below. Other funding sources are being pursued for recreational and open space features. Flood improvements needed to complete the project are: The conveyance system from just north of County Road 66 and terminating at Boxelder Creek (See Figure 2) Channel improvements, to increase conveyance capacity for an approximate three mile reach of Box elder Creek (See Figure 3) Bridge improvements Purchase of right-of-way Land reclamation and wetland enhancement The northern limit of the proposed project is the northern limit of the Towns planning boundary. The southern boundary of the planned project is the confluence of Coal Creek and Boxelder Creek immediately west of the Interstate 25 bridge for Boxelder Creek. These limits were chosen to protect the town and terminate the project at a reasonable location (where the confluence ofthe two creeks is today). Please see Figure 1 for a graphic of the overall project. In summary, the planned conveyance system from Coal Creek to Boxelder Creek needs to convey an estimated 1300-cfs. Boxelder Creek continuing through town needs to convey this additional 1300 cfs. The planned improvements to the Boxelder Creek Channel will maintain or reduce the water surface elevation shown on the FEMA FIRM. Thus, there will be no increased flood hazard due to the planned project. This ahernative does not 9