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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br /> <br />Disadvantages are the additional cost to the Federal government and the challenge of <br />developing appropriate guidelines for REHA delineation in a field that requires flexibility <br />and accessibility to a wide array of analytical options. <br /> <br />The second option shifts the authority for regulating erosion-prone areas to the local <br />jurisdictions. Implementation would be tailored to su~ individual floodplain management <br />needs, The Federal govemment would provide technical assistance, if required, and <br />disseminate information, The main advantage is that the communities would have the <br />flexibility to match their resources and needs with the complexity of the studies. <br /> <br />Conclusions <br /> <br />. It is technologically feasible to map riverine erosion hazard areas. Flexibility in the <br />choice of analysis techniques is needed to address site-specific conditions. <br /> <br />. REHA delineations for a period of 60 years are possible; however, better predictions <br />may be achieved for a shorter time span, such as 30 years, with periodic revisions. <br /> <br />. The analytical methods used should be able to provide an indication of the reliability of <br />REHA delineations, <br /> <br />. Average study values are $2,000-$3,000 per mile for geomorphic methods, $6,000- <br />$7,000 for engineering methods, and $10,000-$12,000 for mathematical modeling <br />methods, <br /> <br />. The cost of mapping REHAs nationwide ranges between approximately 200 and 300 <br />million. This estimate is based on limited information. <br /> <br /> <br />Implementation of erosion regulations can be either done as an extension of the NFIP or <br />delegated to local jurisdictions with support from the Federal govemment. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />11 <br />