The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event (100 year), the 0.2-percent-annual-chance flood event (500 year), and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by FEMA.
Table: S_BFE The Base Flood Elevation (BFE) table is required for any digital data where BFE lines will be shown on the corresponding Flood Insurance Rate Map (FIRM). Normally if there are any riverine AE zones, BFE lines are required. The S_BFE table contains information about the BFEs within a study area. A spatial file with locational information also corresponds with this data table. BFE lines indicate the rounded whole-foot water surface elevation of the 1-percent-annual-chance flood. The spatial elements representing BFE features are lines extending from Special Flood Hazard Area (SFHA) boundary to SFHA boundary. The BFE lines will have no visible gaps or overshoots between the SFHA boundary and the end of the BFE line at the publication scale of the DFIRM. However, the ends of the BFE lines are not necessarily snapped precisely to the SFHA boundary. Each BFE is represented by a single line. While BFE lines are depicted as wavy lines on the hardcopy FIRM, they should be primarily straight lines in the spatial data, although they may bend consistent with procedures described in Volume 1 of these Guidelines.
Table: D_Length_Units LEN_LID LEN_UNIT 1000 CENTIMETERS 1010 FEET 1020 INCHES 1030 KILOMETERS 1040 METERS 1050 MILES 1060 MILLIMETERS
A note about data scale:
Scale is an important factor in data usage. Certain scale datasets are not suitable for some project, analysis, or modeling purposes. Please be sure you are using the best available data.
1:24000 scale datasets are recommended for projects that are at the county level. 1:24000 data should NOT be used for high accuracy base mapping such as property parcel boundaries. 1:100000 scale datasets are recommended for projects that are at the multi-county or regional level. 1:125000 scale datasets are recommended for projects that are at the regional or state level or larger.
Vector datasets with no defined scale or accuracy should be considered suspect. Make sure you are familiar with your data before using it for projects or analysis. Every effort has been made to supply the user with data documentation. For additional information, see the References section and the Data Source Contact section of this documentation. For more information regarding scale and accuracy, see our webpage at: <http://geoplan.ufl.edu/education.html>
** What are you looking for? **** DFIRM Databases
Guidelines and Specifications for Flood Hazard Mapping Partners <http://www.fema.gov/library/viewRecord.do?id=2206>
** Appendix L: Guidance for Preparing Draft Digital Data and DFIRM Database ** Appendix L: Part 1 ** Appendix L: Part 2
The FIS and FIRM are the basis for floodplain management, mitigation, and insurance activities for the National Flood Insurance Program (NFIP). This DFIRM includes data previously published by FEMA in the following Flood Insurance Studies: fema96.shp
Grid of FIRM panels created for this Flood Insurance Study.
Base map surface water features digitized from U.S. Geological Survey Digital Orthophoto Quadrangles.
Grid of USGS 7.5-Minute Series Topographic Maps.
The data arrived on DVD for the following 20-counties; Alachua County Bay County Charlotte County Dixie County Escambia County Flagler County Gilchrist County Gulf County Lafayette County Lake County Leon County Monroe County - (NOTE: No BFE Data Available) Okaloosa County Osceola County Pinellas County Santa Rosa County Seminole County St. Johns County Suwannee County Volusia County
The countywide Digital Flood Insurance Rate Map (DFIRM) Base Flood Elevations (BFE) Databases were originally called: S_BFE.shp
The data was reprojected from various UTM projections to the FGDL Albers HPGN NAD83 projection.
GeoPlan then added the following fields. COUNTY DESCRIPT SOURCEDATE FGDLAQDATE AUTOID
The final process step involved the merging of the 19 counties to create one partial coverage statewide layer.