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<br />5. COST EFFECTIVENESS <br /> <br />. Useful Life ofProjeet <br /> <br />With proper maintenance and operation, the proposed alternative is expected to have a life of in excess <br />of 50-years. Substantial growth in the upstream basin, changes in land use, unexpected large sediment <br />deposition, changes in weather patterns, changes in the highway and/or railroad crossings and <br />overgrowth of vegetation in the channels could impact the life. For the most part, the impacts are items <br />that can be addressed through on-going maintenance. <br /> <br />Annual Maintenance Cost <br /> <br />Appropriate measures are required to keep the planned facilities in proper working order. An operation <br />and maintenance plan will be provided as a part of the design. Basically, the only operation activities <br />required are to put into place any of the required road closure structures. Maintenance will consist of <br />regularly scheduled inspections along with periodic inspections following flood events. Measures <br />must be taken to prevent irregularities or other conditions from forming in the floodway channels, <br />levees, and other structures which could lead to formation of jams from debris or trash, and/or repair of <br />minor damage. With regards to the natural flow channels and widened floodway channels, the <br />designated Flood Superintendent will be responsible to be certain that: <br /> <br />. The natural low flow channel is clear of debris or foreign objects. <br /> <br />. <br /> <br />. The floodway channel and the natural low flow channel are not being restricted by the disposal of <br />waste materials, building of unauthorized structures or other encroachments (including planting of <br />restricted crops). <br /> <br />. The capacity of the floodway channel is not reduced by formation ofIarge sediment deposits. <br /> <br />. Banks are not being damaged by wave action, wind and rain erosion, and that sloughing of banks is <br />not occurring. <br /> <br />. Riprap sections are in good condition with no displacement, looseness, or washing, and no removal <br />of material is occurring. <br /> <br />. Approach channels adjacent to the floodway channel are sufficiently clear of obstructions and <br />debris to permit proper functioning of the project. <br /> <br />. The capacity of the floodway channel is not reduced by trees and brush. <br /> <br />Immediate steps will be taken to remedy any adverse conditions disclosed by such inspections. <br />Periodic repair and cleaning and the removal of debris and sediment as may be necessary will be <br />completed in a manner as to insure that wetlands grasses in the natural low flow channel remain in <br />place. <br /> <br />. <br /> <br />m-34 <br />