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<br />G. Revisions Based On The Use Of An Altemative <br />Methodology <br />1, Alternative Hydrologic Methodology, The following data must be <br />submitted: <br />a New hydrologic analysis using the alternative methodology <br />b, Explanation of why the alternative methodology is superior to <br />the original methodology <br />c. New hydraulic analysis, using the new flood discharge values <br />resulting from the hydrologic analysis <br />d, Revised delineations of the floodplain boundaries and <br />floodway <br />2, Alternative Hydraulic Methodology, The following data must be <br />submitted: <br />a New hydraulic analysis using the alternative methodology and <br />the original flood discharge values <br />b, Explanation of why the alternative methodology is superior to <br />the original methodology <br />c, Revised delineations of the floodplain boundaries and <br />floodway <br /> <br />c <br /> <br />H. Revisions To Correct Indisputable Errors In The <br />Original Analysis <br />1, Mathematical error, The requestor must identify the error; FEMA <br />will perform new calculations to correct the error. <br />2, Measurement error, The requestor must identify the error; FEMA <br />will perform new calculations to correct the error. <br /> <br />I. Revisions To Exclude Individual Structures And Legally <br />Described Parcels Of Undeveloped Land From The <br />SFHA Based On Altered Topography <br />The determinations and changes made by FEMA will be similar to <br />those described in the following amendments section, The requestor <br />must provide data that to verify the location of the structure or parcel of <br />land and to show that the structure or parcel of land is not subject to <br />flooding during the base flood, Therefore, these data generally will be <br />the same as those required to support a request for a Map Amendment. <br />However, because the Changes handled under the Map Revision pro- <br />cess will involve alterations of topography, the following additional <br />requirements will also apply:' <br />1, Structure exclusion, WhElO the revision involves the exclusion <br />from the SFHA of a structure that has been elevated by the <br />placement of fill, the requestor must submit data showing that <br />the entire structure including the lowest floor (basement) is at or <br />above the BFE. <br />2. land parcel exclusion, When the revision involves the exclusion <br />from the SFHA of a parcel of land that has been filled, the <br />requestor must submit data showing that all land within the <br />legally described limits of the parcel is at or above the BFE. <br /> <br />c <br /> <br />J. Conditional Revisions Based On The Effects Of <br />Proposed Projects Or Future Conditions <br />Except for the fact that any maps, plans, drawings, measurements, or <br />elevation data that are submitted will not reflect existing conditions, the <br />data required to support requests for Conditional lOMR's are generally <br />the same as those reqUired to support requests for revisions, A fee will <br />be assessed for the evaluation of requests for conditional revisions after <br />January 1, 1986, <br />General Technical Guidance <br />When developing technical supporting data, requestors should con- <br />sider the following points: <br />. Unless based on indisputable and clearly defined mathematical or <br />measurement errors in the original FEMA analyses, revision <br />requests must be accompanied by all the data that FEMA needs <br />to revise the FHBM or FIRM, FIS report, and FBFM, Therefore, the <br />requestor should be prepared to perform new hydrologic and <br /> <br />t <br /> <br />26 <br />