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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 />Boslf!.~ Vl!qsh Draina.se Mast~e.r ~lan.. <br />! ~-- ." ' <br /> <br />Phase 2: Altemative Drainage Facility Evaluation <br /> <br /> <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 />Property Acquisition $487,000 N/A <br />Operation and Maintenance $0 N/A <br />Total: $795,000 <br /> <br />The structural improvements identified as p~~ of thi.s alternative are th~ 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 /> <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 helps 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 />5.0 RECOMMENDED PLAN <br /> <br />5.1 Selected Improvements <br /> <br />The recommended plan, as conceived by HDR, consists of a combination of immediate <br />improvements and anticipation of future improvements. It attempts to reduce the flood <br />hazard during the frequent events immediately, while including components that are <br />consistent with a long term plan to control flood hazard from the lOO-year flood. It also <br />recognizes the cost of improvements and the burden that large capital expenditures place <br />on the County and the GJJD. The recommended plan includes recommendations to <br /> <br />[;3l~~~':~'~~~l;~:U\I '0.:~,:z?I;}'_:~2t:~T-.::7:,:-::''':':~i:=-_ '- ~~ ~~~-~=~'~::=~2~=- _ ~.. ~~:~.;::- _ <br /> <br />"',\~~"T&.~ <br />:> ,~,; <br />':i(':\if';:&~-;:;t,'~; <br /> <br /> <br />Page 21 <br /> <br />r;" <br />~ <br />'""\..:.:>' <br /> <br />@t <br />