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<br />i1 <br /> <br />III. SELECTED PLAN AND RECOMMENDATIONS <br />The results of the hydraulic analysis when combined with the damage <br />reduction aspect, point to the feasibility of a channel and bridge <br />improvement project, in combination with the flood proofing of new and <br />existing structures. Flood proofing for new structures should consist of ele- <br />vating the first floor, and the avoidance of using below grade space for the <br />storage of inventory. The results of the hydraulic analysis have been <br />included in the Appendix of this report. <br />A 80 to 8S-foot wide rectangular section, in combination with the <br />enlargement of the 31st Street Bridge, would provide flood protection to <br />approximately the 50-year frequency, with the 100-year overtopping the channel <br />banks, and causing two to three-foot depths along overbanks. Figure 3 shows <br />these improvements in plan view, with Figure 4 showing a typical flood plain <br />and channel section. The 100-year floodway with the channel improvements <br />constructed is within the channel banks, which therefore, allows for the pla- <br />cement of fill in the flood fringe areas, without impacting adjacent or <br />upstream properties. <br />Included with the channel and bridge improvements, would be the provision <br />for a new raw water intake to replace the existing City facilities. This <br />could be constructed as part of a grade control structure which is also <br />necessary for this project. Protection of the U.S. Highway 24 roadway embank- <br />ment must be ensured, as modification of the existing slopes is not advised. <br />Costs for the improvements have been estimated at $2.6 million. This <br />estimate includes the cost of the channel improvements, the 31st Street Bridge <br />enlargement, modifications of the water diversion structure, utility reloca- <br />tions, engineering and contingencies. Table 4 summarizes the cost estimation. <br />Costs associated with the elevating of structures and other flood proofing <br />measures have not been included in. this estimate. The construction of the <br />improvements will reduce 10D-year flood damages by approximately $6.9 million. <br /> <br />Compliance with Existing Plans <br />The channelization concept of the proposed facilities for this reach of <br />Fountain Creek is in basic agreement with the conceptual plans discussed in <br />the U.S. Army Corps of Engineers Reconnaissance Study for Fountain Creek, and <br />with the Fountain Creek Master Planning Study. Both of these documents <br />