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<br />Benefit/cost analysis <br /> <br />Operation and maintenance requirements <br /> <br />Environmental considerations <br /> <br />For each plan, the tables summarize the estimated costs from an <br /> <br />engineering assessment of the various types of potential flood damage. <br /> <br />In the assessment of potential flood damages, an attempt has been m;lcle <br /> <br />to correlate the extent of inundation, dcpth, velocities, and duration <br /> <br />of flood waters for each of thc storm frequencies studied. <br /> <br />Indirect <br /> <br />lwnefits which result from the improvemcnts in Plans 2 ancl 3 and which <br /> <br />arc not easily defined in terms of costs arc the elimination of traffic <br /> <br />clelays, open space, recreation areas, safety, etc. <br /> <br />Each plan is presented on topographic base mapping at a scale of <br /> <br />1"~IOOO I and is available from the District. <br /> <br />Due to the steepness of <br /> <br />the channel, minor differences in the width of the flood plains for <br /> <br />the 10-, 25-, and 100-year frequency storms are not visible at this <br /> <br />scale of mapping. <br /> <br />B.) Plan No.1 - Flood Plain Delineation (Plate No.6, Volume 2, <br />Drawln-gs) - ------ <br /> <br />This plan IS based on no improvements to the drainage struc- <br /> <br />tures or channel and relies strictly on flood plain zoning and flood <br /> <br />plain management to eliminate the increase of flood hazards. <br /> <br />This plan <br /> <br />is particularly attractive since it docs not require expenditure of any <br /> <br />puhlic funds for the construction of iLJprovements. <br /> <br />The various entitips <br /> <br />would be required to cnact into its governmental chartcrs strict crlteria <br /> <br />for 1 and management and use for flood-prone ;neas as outl ined in the <br /> <br />Nation"l Flood Insurance Program. <br /> <br />For example, this regulation 1'1'0- <br /> <br />-~8- <br />