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<br />j <br />I <br />~ <br />, <br />" <br />I <br />i <br /> <br />profile and the surveyed lowest adjacent grade and/or lowest floor elevation, <br />appropriately should be used to make a determinatio.," <br /> <br />Prudence may require that a more conservative margi.n than 50 feet be used t,:> <br />determine the need for ancillary data to support a GIS determination.. Terrain <br />variations, the nature of flood hazards in the area, and the quality of all <br />digital data being. used to make the determination should be considered when <br />establishing the need for collecting survey and flood profile data. <br /> <br /> <br />An example of the use of the good faith standard for m,.king determinations is ~I>e <br />development of guidelines for the use of FloodView, a OFIRH visualization tool <br />to be distributed with NFIP CO-ROM digital mapping products. FloodView will <br />display DFIRM data overlaid on u.s. Bureau of the Census Tiger line file data. <br />Due to horizontal accuracy limitations of TIGER line file data, FloodVie'" <br />software will alert users whenever there are multiplE! flood risk zones within a <br />minimum 250 foot radius rf the location of in'tereE~t to the URer. A screen <br />message will advise users thqt multiple hazard zones exist within close proximity <br />to the location of interest under such circumstan~~s. Guidance ~ application <br />of the FloodView software to;,_i advises users to reft~r to other ddta i.f a property <br />determination is required w~thin such proximity to the SFHA. <br /> <br />Revisions and Appeals of DFIRMs <br /> <br /> <br />The DFIRM thematic data is simply a digital version 0:[ the source hardcopy FIRM. <br />Increasingly, hardcopy FIRMs are being generated f:rom the DFIRM. Thus, any <br />revisions, appeals, or other requests for changes to DFIRMs can be made under the <br />same mechanisms as those developed for the hardcopy format FIRMs. The only <br />change the DFIRM represents is the format of the data. Existing NFIP regulations <br />and procedures are not impacted by this change. Howe'ITer, the end user does have <br />the option of submitting requests for revisions to FEMA in a digital format. <br /> <br />Physical Format of DFIRMs <br /> <br />DFIRMs in the USGS DLG-3 will be made available on Compact Disc - Read Only <br />Memory (CD-ROM) format. These discs will be compatible with the ISO 9660 <br />standard for CD-ROMs. CD-ROM drives and interface kits supporting this data <br />standard and compatible with PC technology are commonly available in the <br />marketplace. FEMA does not plan to supply these data on any other media, such <br />as magnetic tape, floppy disks, or similar technologies. <br /> <br />10/93 <br /> <br />vi <br />