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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />e.. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br /> <br />Bosl.~~ Wasfr.Drainage J:!aster Plan <br /> <br /> <br />Phase 2: Alternative Drainage Facility Evaluation <br /> <br />Table 1 <br />Summary of 100- Year Capital Improvement Costs <br /> <br />Improvement Estimated Cost Reference Figure <br />Large Storage at Reservoir A $1,150,000 Figure 8 <br />Storage at Reservoir M&N $940,000 Figure 7 <br />Stub Ditch Channel Improvements $207,000 Figure 9 <br />F % Road Culvert Improvements $100,000 Figure 10 <br />Hwy 6/UPRR Culvert Improvements $100,000 Figure 14 <br />Operation and Maintenance $0 N/A <br /> Total: $2,500,000 <br /> ~ ,-- -- <br /> <br />The structural improvements identified as part of this alternative are the most expensive <br />elements, but certainly do not represent the program in its entirety. Maintenance of these <br />new facilities, and all of the existing facilities, is critical. Particular attention should be <br />given to the underpasses and culverts that cross the existing network of irrigation ditches. <br />There has been historic evidence of erosion and sedimentation in the channels. This <br />should be monitored and, when necessary, corrected.. Finally, there have been reports of <br />debris, such as tree limbs, large rocks or other types of obstructions, clogging the <br />facilities. The routine maintenance program will help to control this. Modifications to <br />entrances, including the construction of trash racks or debris basins, should be considered <br />and, when appropriate, included in the overall plan implementation process. <br /> <br />4.3 10-year system <br /> <br />The lO-year system of improvements identified for Bosley Wash reduces the flood <br />hazard within the Watershed, but does not try to eliminate all flooding for large storms. <br />Rather, it recognizes the high cost of improvements, particularly detention storage, and <br />focuses investment in areas of frequent and widespread flooding. This system relies on <br />the continuation of the inadvertent storage above 1-70 to help control downstream flows. <br />It also leverages the inadvertent, albeit flood causing, storage at G Road and the <br />Government Highline Canal. Through property acquisition, the impact of these areas of <br /> <br />tr'~-:::7~3-~:0,7Ji_..:CJ1;;':=~-:::;~~:J~{2:::'~_?'~:'Y<;~~~:2-~ =~2;~j~-- .::::, --~ "- -~,~~,~ ~.:___ <br /> <br />".,;.LiGilt;p <br />:';'" #~: <br />:~,{~:,;~;J <br /> <br />Q) <br /> <br />Page 19 <br /> <br />/---.., <br /> <br />~~ <br /> <br />@l. <br />