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H. Floodway Revisions Made Independendy of Appeal or Map Revisions The following data must be submitted: 1. Engineering analysis for the revised f1oodway, performed accord- ing to the following steps: a The original hydraulic computer model used to develop the existing BFE's should be notified to include all encroachments that have occurred in the floodplain since the existing flood- way was developed, b, The floodway analysis should be performed with the modified computer model using the desired floodway limits. c. The floodway limits should be set so that the combined effects of the past encroachments and the new floodway limits do not increase the effective BFE's by mote than the amounts allowed by FEMA and the State, 2, Delineation of the revised floodway on a copy of the effective NFIP map, (, ....-. I. General Technical Guidance When developing technical supporting data, requestor's should con- sider the following points: . All analyses and data submitted by the requestor must be certified by a registered professional engineer or licensed land surveyor, . Input and output data from the original hydraulic computer model may be requested through the FEMA Regional Office in Denver, . FEMA policies concerning floodway revisions based on changes in fiood discharges or the effects.of earth-fill levees or other struc- tures are the same and those outlined for Map Revisions. J. Floodway Revision Procedures As explained earlier, a request for a f100dway revision may be part of either an Appeal or a Map Revision that results in changes to BFE's, or may be submitted independently as a Protest or a Map Revision request that involves only the f1oodway. A request for a floodway revi- sion that is part of an Appeal or a Map Revision request will not be ac- knowledged separately, Requests that involve only the floodway will be acknowledged by letter to the community, If it is part of an Appeal or Map Revision, the request will be reviewed and resolved, If the request invoives changes to the floodway only, FEMA will review the request and the supporting data submitted with it. If any questions or problems arise during this review, FEMA will work with the community, the designated community official, or the requestor to resolve them, If FEMA determines that additionai data are required to support the request, these data wili be requested by letter, The letter will be sent to the community, If appropriate, a copy will be sent to the designated community official. To avoid spending time reviewing poorly documented requests, FEMA allows 30 days for the community to provide the requested data, If the data are to provided within the aliotted time, FEMA will complete the review using the data originally submitted, If the requested data are provided, FEMA will consider them in the review, After reviewing all the supporting data, FEMA will determine whether the request is warranted, The action taken by FEMA at this point will depend on whether the request was submitted as a Protest or as a request for a Map Revision. c K. Protests If no revision is warranted, FEMA will inform the community by letter that the request is denied, If a revision is warranted, the revised flood- way will be incorporated into the map at the time it is priMed and before it becomes effective, The revised floodway data will be incor- porated' into the FIS report at the same time, t L. Map Revision If no revision is warranted, FEMA will inform the community by letter that no further action will be taken until adequate supporting data are provided, 34