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<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 />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />B~sley"!Vash Drainag~ lv!ast~r Plan <br /> <br /> <br />Phase 2: Alternative Drainage Facility Evaluation <br /> <br />repairs or utility relocation. Table 3 presents a tabular summary of the costs of the <br /> <br />improvements associated with this alternative. <br /> <br />Table 2 <br />Summary of 10- Year Capital Improvement Costs <br /> <br />Improvement Estimated Cost Reference Figure <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 />Property Acquisition (Reservoirs M&N and A) $15,000 Figures 7 & 8 <br />Operation and Maintenance $0 N/A <br />f-' . -- --- ,_. <br />Total: $422,000 <br /> <br />The structural improvements and land acquisition identified as part of this alternative are <br />the most expensive elements, but certainly do not represent the program in its entirety. <br />Maintenance of these new facilities, and all of the existing facilities, is critical. Particular <br />attention should be given to the underpasses and culverts that cross the existing network <br />of irrigation ditches. There has been historic evidence of erosion and sedimentation in the <br />channels. This should be monitored and, when necessary, corrected. Finally, there have <br />been reports of debris, such as tree limbs, large rocks or other types of obstructions, <br />clogging the facilities. The routine maintenance program helps to control this. <br />Modifications to entrances, including the construction of trash racks or debris basins, <br />should be considered and, when appropriate, included in the overall plan implementation <br /> <br />process. <br /> <br />5.2 Phasing <br /> <br />Improvements included in the recommended plan can, and should, be phased. Based on <br />an evaluation of the flood risk within the Bosley Wash basin, it appears that the highest <br />priority should be construction of the improvements along F % Road. These <br />improvements serve to reduce flooding in the immediate vicinity of the roadway. More <br />importantly, reducing the likelihood of flooding along the road will also reduce the <br /> <br />; )'j,~';il,;:'lf.!ffUi< ~ <br />;.,7.., <br />,"," <br />" '" 0. <br /><;""f~",;'~'~J:;.~'~ <br /> <br /> <br />Page 23 <br /> <br />~------\ <br /> <br />~ <br /> <br />!ill. <br />