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FLOOD02115
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Last modified
1/25/2010 6:23:24 PM
Creation date
10/4/2006 10:37:52 PM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
National Flood Insurance Program Standards for Digital Flood Insurance Rate Maps
Date
10/1/1993
Prepared By
FEMA
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />~ <br /> <br />t <br />, <br /> <br />, <br />~ <br />, <br /> <br />recognizes that despite FEKA'" best efforts to make the FIRMs as useful as <br />possible, the descriptions of SFHA areas, as depicted by some maps, may, in some <br />instances, not be clear enough to permit lenders to d~cide with certainty and <br />recision whether or not property,which is the security for a loan or which is <br />~he subject of financial assistance is located in such an area. It is for this <br />reason that FEKA has recommended a "good faith standard." The good faith <br />standards require lenders to exercise -due diligence and good faith" in <br />determining the location of a property which is the subject q~~~ loan r~lative <br />t.o d.r~Q.~ c: spe.:';'Q.:" ~l,,:,.-:..."": :-..:::.............:;:, 0:::' ~:.U....II UI! a. F:i:N':. .l.ll.l.~ ';;l........................t:. ~'-> ..... _......_ <br />explained, with additional information on the 1973,' Act in FEHA Publication 186, <br />october 1989, "Mandatory Purchase of Flood Insurance Guidelines.- <br /> <br />When determinations are being made by lenders, or firms or individuals retained <br />by lenders to assist in these endeavors, collateral data in addition to the FIRM <br />is frequently required. FIRMs do not include all roads within communities, nor <br />dp they depict address, property boundary, or structure location inform~tion. <br />As a result, determinations frequently can only be made by uSirig an ancillary <br />source of data, suen. as a land parcel map, to di:!termine the'; location of a <br />property on the FIRM ' <br /> <br />o <br /> <br />Digital address range data, land parcel, and structure information is available <br />for many communities across the Nation. Using these digital data and GIS <br />technology, it is possible to make determinations relative to the 1973 Act, and <br />meeting the Good Faith Standard. However, the lenders must assure that due <br />diligence and good faith is exercised in application of digital mapping systems <br />to make determinations. Because of both the increased complexity and analytical <br />capabilities of GIS, assuring compliance with the good faith standard may require <br />additional effort relative to use of paper maps. <br /> <br />A prime concern is to assure accuracy of the digital base map and structure <br />location data are appropriate for use with DFIRM data to make determinations <br />relative to the 1973 Act. The concern for accuracy of the ancillary data used <br />with DFIRMs should increase in direct proportion to the relative closeness of the <br />property under analysis to the SFHA boundary. Thus, lenders might not find it <br />to be prudent to use digital data at the 1:100,000 scale as the primary source <br />of information upon which to make a determination regarding a property located <br />within 200 feet of a SFHA. Such caveats should be carefully considered when U.S. <br />Bureau of the Census TIGER line file address range data is used as the source <br />from which property determinations will be made. <br /> <br />In some instances, GIS will enable the use of large scale land parcel, topograph- <br />ic, structure, and other information, with OFIRMs to make determinations. GIS <br />technology allows maps to be created at any user specified scale. Enlargement <br />of scales does allow for precise determinations to be made. However, precise <br />measurements are not inherently accurate. Accuracy can only be assessed from an <br />appraisal of the quality of source data. As noted previously, SFHA boundary <br />information conveyed by DFIRMs was developed to overlay USGS 7.S-minute <br />topographic maps at a scale of 1:24,000. Thus, DFIRM data cannot be assumed to <br />have an accuracy of better than 40 feet. Due to other limitations inherent in <br />DFIRMs, FIA recommends that determinations using GIS technology and DFIRHs <br />generally be made only when structures are located 50 or more feet from a SFHA <br />boundary. In these cases, data such as the BFE determined from a FIS flood <br /> <br />10/93 <br /> <br />v <br />
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