43 datasets found
  1. n

    FEMA National Flood Hazard Layer Viewer

    • data.gis.ny.gov
    Updated Mar 29, 2023
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    ShareGIS NY (2023). FEMA National Flood Hazard Layer Viewer [Dataset]. https://data.gis.ny.gov/datasets/fema-national-flood-hazard-layer-viewer
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    Dataset updated
    Mar 29, 2023
    Dataset authored and provided by
    ShareGIS NY
    Description

    The National Flood Hazard Layer (NFHL) is a geospatial database that contains current effective flood hazard data. FEMA provides the flood hazard data to support the National Flood Insurance Program. You can use the information to better understand your level of flood risk and type of flooding.The NFHL is made from effective flood maps and Letters of Map Change (LOMC) delivered to communities. NFHL digital data covers over 90 percent of the U.S. population. New and revised data is being added continuously. If you need information for areas not covered by the NFHL data, there may be other FEMA products which provide coverage for those areas.In the NFHL Viewer, you can use the address search or map navigation to locate an area of interest and the NFHL Print Tool to download and print a full Flood Insurance Rate Map (FIRM) or FIRMette (a smaller, printable version of a FIRM) where modernized data exists. Technical GIS users can also utilize a series of dedicated GIS web services that allow the NFHL database to be incorporated into websites and GIS applications. For more information on available services, go to the NFHL GIS Services User Guide.You can also use the address search on the FEMA Flood Map Service Center (MSC) to view the NFHL data or download a FIRMette. Using the “Search All Products” on the MSC, you can download the NFHL data for a County or State in a GIS file format. This data can be used in most GIS applications to perform spatial analyses and for integration into custom maps and reports. To do so, you will need GIS or mapping software that can read data in shapefile format.FEMA also offers a download of a KMZ (keyhole markup file zipped) file, which overlays the data in Google Earth™. For more information on using the data in Google Earth™, please see Using the National Flood Hazard Layer Web Map Service (WMS) in Google Earth™.

  2. Flood Hazard Area

    • catalog.data.gov
    • datadiscoverystudio.org
    • +4more
    Updated Dec 2, 2020
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    Federal Emergency Management Agency (Point of Contact) (2020). Flood Hazard Area [Dataset]. https://catalog.data.gov/dataset/flood-hazard-area
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    Dataset updated
    Dec 2, 2020
    Dataset provided by
    Federal Emergency Management Agencyhttp://www.fema.gov/
    Description

    The National Flood Hazard Layer (NFHL) data incorporates all Digital Flood Insurance Rate Map(DFIRM) databases published by FEMA, and any Letters Of Map Revision (LOMRs) that have been issued against those databases since their publication date. The DFIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper Flood Insurance Rate Maps(FIRMs). The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The NFHL data are 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 the Federal Emergency Management Agency (FEMA). The specifications for the horizontal control of DFIRM data are consistent with those required for mapping at a scale of 1:12,000. The NFHL data contain layers in the Standard DFIRM datasets except for S_Label_Pt and S_Label_Ld. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all DFIRMs and corresponding LOMRs available on the publication date of the data set.

  3. a

    FEMA Major Flood Hazard Areas

    • hub.arcgis.com
    • it-gis-hub-moco.hub.arcgis.com
    • +1more
    Updated Jun 13, 2017
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    Montgomery County, Texas IT-GIS (2017). FEMA Major Flood Hazard Areas [Dataset]. https://hub.arcgis.com/maps/f88d9fa4c78744a78e2b77cf1baefda9
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    Dataset updated
    Jun 13, 2017
    Dataset authored and provided by
    Montgomery County, Texas IT-GIS
    Area covered
    Description

    This dataset comes from the FEMA S_Fld_Haz_Ar table. The S_Fld_Haz_Ar table contains information about the flood hazards within the flood risk project area. A spatial file with location information also corresponds with this data table. These zones are used by FEMA to designate the SFHA and for insurance rating purposes. These data are the regulatory flood zones designated by FEMA. A spatial file with location information also corresponds with this data table.This information is needed for the following tables in the FIS report: Flooding Sources Included in this FIS report, and Summary of Hydrologic and Hydraulic Analyses.The spatial elements representing the flood zones are polygons. The entire area of the jurisdiction(s) mapped by the FIRM should have a corresponding flood zone polygon. There is one polygon for each contiguous flood zone designated.FEMA Regulatory Floodway are flood zone polygons marked as a regulatory floodway.FEMA 100 year are flood zone polygons where there is a 1% Annual Chance, also known as the 100 year.FEMA 500 year are flood zone polygons where there is a 0.2% Annual Chance, also known as the 500 year.This map is not intended for insurance rating purposes and is for information only. This map is a representation and approximation of the relative location of geographic information, land marks and physical addresses. The map may not be 100% accurate in locating your address. The floodplains shown on this mapping tool are those delineated on the Federal Emergency Management Agency’s (FEMA) Digital Flood Insurance Rate Map (DFIRM or floodplain map) for Montgomery County. This map is not an official FEMA Digital Flood Insurance Rate Map. The effective DFIRMs are produced, maintained, and published by FEMA and not by Montgomery County. Official determinations are provided by FEMA.

  4. a

    FEMA Flood Insurance Rate Maps

    • hub.arcgis.com
    Updated Aug 5, 2024
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    County of Volusia (2024). FEMA Flood Insurance Rate Maps [Dataset]. https://hub.arcgis.com/maps/VolusiaCountyFL::fema-flood-insurance-rate-maps-2
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    Dataset updated
    Aug 5, 2024
    Dataset authored and provided by
    County of Volusia
    Area covered
    Description

    The modified BFEs and revised map panels are effective as of Sept. 29, 2017 and revise the FIRM that was in effect prior to that date. Four panels were revised Aug. 7, 2018 and have been included in the product. Four LOMR areas were included in Jan. 2020 and reflect changes ranging from Aug. 28, 2018 through Jan. 10, 2020.These files are digital copies of the flood risk maps for Volusia county in PDF file format. Flood zone boundaries and elevations depicted on these maps may be adjusted later. Additionally, FEMA may update the FIRMs at any time, which may not coincide with this file’s update cycle. To view the most up to date information, visit FEMA’s NFHL Viewer. The most recent official shapefiles can be downloaded from the FEMA Flood Map Service Center.A FIRM (also referred to as a flood map) is the official map that shows Special Flood Hazard Areas (SFHA) and the risk premium zones applicable to a community. Risk zones indicated on a FIRM provide a basis for establishing flood insurance coverage premium rates offered through the National Flood Insurance Program (NFIP).This dataset enables a visualization of the floodplain and floodway extents. Due to the nature of this data, often times ESRI generated base maps and flood data can potentially be misaligned, therefore actual flood extents may be misrepresented. This product is not intended to be used for regulatory purposes and should only be used as a planning and visualization tool.

  5. a

    FEMA's National Flood Hazard Layer Viewer

    • opendata-volusiacountyfl.hub.arcgis.com
    Updated May 21, 2025
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    County of Volusia (2025). FEMA's National Flood Hazard Layer Viewer [Dataset]. https://opendata-volusiacountyfl.hub.arcgis.com/datasets/femas-national-flood-hazard-layer-viewer
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    Dataset updated
    May 21, 2025
    Dataset authored and provided by
    County of Volusia
    Description

    In the NFHL Viewer, you can use the address search or map navigation to locate an area of interest and the NFHL Print Tool to download and print a full Flood Insurance Rate Map (FIRM) or FIRMette (a smaller, printable version of a FIRM) where NFHL data exists. Technical GIS users can also utilize a series of dedicated GIS web services that allow the NFHL database to be incorporated into websites and GIS applications. For more information on available services, go to the NFHL GIS Services User Guide.You can also use the address search on the FEMA Flood Map Service Center (MSC) to view the NFHL data or download a FIRMette. Using the “Search All Products” on the MSC, you can download the NFHL data for a County or State in a GIS file format. This data can be used in most GIS applications to perform spatial analyses and for integration into custom maps and reports. To do so, you will need GIS or mapping software that can read data in shapefile format.FEMA also offers a download of a KMZ (keyhole markup file zipped) file, which overlays the data in Google Earth™. For more information on using the data in Google Earth™, please see Using the National Flood Hazard Layer Web Map Service (WMS) in Google Earth™.

  6. Flood Areas Shape File Utah

    • opendata.utah.gov
    application/rdfxml +5
    Updated Apr 13, 2015
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    FEMA (2015). Flood Areas Shape File Utah [Dataset]. https://opendata.utah.gov/w/vakf-vevf/u7hz-5yd9?cur=9TW5hireTGH&from=ostlFjQdelr
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    xml, csv, application/rssxml, application/rdfxml, json, tsvAvailable download formats
    Dataset updated
    Apr 13, 2015
    Dataset provided by
    Federal Emergency Management Agencyhttp://www.fema.gov/
    Authors
    FEMA
    License

    U.S. Government Workshttps://www.usa.gov/government-works
    License information was derived automatically

    Area covered
    Utah
    Description

    The Floodplains data contains 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, the 0.2-percent-annual-chance flood event, 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 the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth’s surface using the UTM projection and coordinate system. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12000.

  7. d

    Flood Insurance Rate Maps and Base Flood Elevations, FIRM, DFIRM, BFE -...

    • datadiscoverystudio.org
    • data.wu.ac.at
    xml
    Updated Aug 19, 2017
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    (2017). Flood Insurance Rate Maps and Base Flood Elevations, FIRM, DFIRM, BFE - FLOODPLAINS_CROSSSECTION_DFIRM_IDNR_IN: DFIRM Floodplain Cross section Lines for 86 of 92 Counties in Indiana (Indiana Department of Natural Resources, 1:12,000, Line Shapefile). [Dataset]. http://datadiscoverystudio.org/geoportal/rest/metadata/item/c4e776e6c6274566a16c59f95cc284b8/html
    Explore at:
    xmlAvailable download formats
    Dataset updated
    Aug 19, 2017
    Area covered
    Indiana
    Description

    description: This line layer represents cross sections (XS) created from FEMA Flood Rate Insurance Maps (FIRM). These lines represent the locations of channel surveys performed for input into the hydraulic model used to calculate flood elevations. These locations are also shown on the Flood Profiles in the Flood Insurance Study (FIS) report and can cross reference the Flood Profiles to the planimetric depiction of the flood hazard. Of 92 counties in Indiana, 86 are included in this DFIRM data set and 61 counties have XS information. The following 6 counties are omitted – Allen, DeKalb, Johnson, Lake, Marion, Vanderburgh. These counties will be completed as work on the IDNR project progresses. This floodplain data may be used with an associated floodplain polygon shapefile and base flood elevation line shapefile. IDNR documentation states - “This database is an interim version of the Digital Flood Insurance Rate Map (DFIRM) Database. It does not fully meet all DFIRM specifications as found in “Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix L: Guidance for Preparing Draft Digital Data and DFIRM Database ”. A fully compliant product is expected in 2005. 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 the Federal Emergency Management Agency (FEMA). The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000. The DFIRM Database presents the flood risk information depicted on the FIRM in a digital format suitable for use in electronic mapping applications. The DFIRM database is a subset of the Digital FIS database that serves to archive the information collected during the FIS. ”; abstract: This line layer represents cross sections (XS) created from FEMA Flood Rate Insurance Maps (FIRM). These lines represent the locations of channel surveys performed for input into the hydraulic model used to calculate flood elevations. These locations are also shown on the Flood Profiles in the Flood Insurance Study (FIS) report and can cross reference the Flood Profiles to the planimetric depiction of the flood hazard. Of 92 counties in Indiana, 86 are included in this DFIRM data set and 61 counties have XS information. The following 6 counties are omitted – Allen, DeKalb, Johnson, Lake, Marion, Vanderburgh. These counties will be completed as work on the IDNR project progresses. This floodplain data may be used with an associated floodplain polygon shapefile and base flood elevation line shapefile. IDNR documentation states - “This database is an interim version of the Digital Flood Insurance Rate Map (DFIRM) Database. It does not fully meet all DFIRM specifications as found in “Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix L: Guidance for Preparing Draft Digital Data and DFIRM Database ”. A fully compliant product is expected in 2005. 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 the Federal Emergency Management Agency (FEMA). The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000. The DFIRM Database presents the flood risk information depicted on the FIRM in a digital format suitable for use in electronic mapping applications. The DFIRM database is a subset of the Digital FIS database that serves to archive the information collected during the FIS. ”

  8. d

    National Flood Hazard Layer (NFHL).

    • datadiscoverystudio.org
    html, pdf, shtml
    Updated Sep 21, 2017
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    (2017). National Flood Hazard Layer (NFHL). [Dataset]. http://datadiscoverystudio.org/geoportal/rest/metadata/item/f1e0701d2cdb49089648a3df33c7c790/html
    Explore at:
    html, shtml, pdfAvailable download formats
    Dataset updated
    Sep 21, 2017
    Description

    description: The National Flood Hazard Layer (NFHL) is a compilation of GIS data that comprises a nationwide digital Flood Insurance Rate Map. The GIS data and services are designed to provide the user with the ability to determine the flood zone, base flood elevation, and floodway status for a particular location. It also has information about the NFIP communities, map panels, cross sections, hydraulic structures, Coastal Barrier Resource System, and base maps such as road, stream, and public land survey data. Through flood studies, FEMA produces Flood Insurance Study Reports, FIRM Panels, and FIRM Databases. FIRM Databases that become effective are incorporated into the NFHL. Updates to the NFHL are issued through Letters of Map Revision (LOMRs) and Letters of Map Amendment (LOMAs). Continuously updated, the NFHL serves as a Digital Flood Insurance Rate Map representing the current effective flood data for those communities where maps have been digitized. NFHL data can be viewed with widely available GIS software, including freely available programs that work with GIS shapefiles. For more information on the NFHL, see the online resources referenced herein. Using base maps: The minimum horizontal positional accuracy for base map hydrographic and transportation features used with the NFHL is the NSSDA radial accuracy of 38 feet. Letter of Map Amendment (LOMA) point locations are approximate. The location of the LOMA is referenced in the legal description of the letter itself. LOMA points can be viewed in the NFHL Interactive Map on the FEMA GeoPlatform.; abstract: The National Flood Hazard Layer (NFHL) is a compilation of GIS data that comprises a nationwide digital Flood Insurance Rate Map. The GIS data and services are designed to provide the user with the ability to determine the flood zone, base flood elevation, and floodway status for a particular location. It also has information about the NFIP communities, map panels, cross sections, hydraulic structures, Coastal Barrier Resource System, and base maps such as road, stream, and public land survey data. Through flood studies, FEMA produces Flood Insurance Study Reports, FIRM Panels, and FIRM Databases. FIRM Databases that become effective are incorporated into the NFHL. Updates to the NFHL are issued through Letters of Map Revision (LOMRs) and Letters of Map Amendment (LOMAs). Continuously updated, the NFHL serves as a Digital Flood Insurance Rate Map representing the current effective flood data for those communities where maps have been digitized. NFHL data can be viewed with widely available GIS software, including freely available programs that work with GIS shapefiles. For more information on the NFHL, see the online resources referenced herein. Using base maps: The minimum horizontal positional accuracy for base map hydrographic and transportation features used with the NFHL is the NSSDA radial accuracy of 38 feet. Letter of Map Amendment (LOMA) point locations are approximate. The location of the LOMA is referenced in the legal description of the letter itself. LOMA points can be viewed in the NFHL Interactive Map on the FEMA GeoPlatform.

  9. s

    FEMA Flood Zones: San Francisco Bay Area, California, 2001

    • searchworks.stanford.edu
    zip
    Updated Nov 27, 2021
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    (2021). FEMA Flood Zones: San Francisco Bay Area, California, 2001 [Dataset]. https://searchworks.stanford.edu/view/wz946gr9760
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    zipAvailable download formats
    Dataset updated
    Nov 27, 2021
    Area covered
    San Francisco, California, San Francisco Bay Area
    Description

    This polygon shapefile depicts Q3 Flood Data features of FEMA's Flood Insurance Rate Map (FIRM) product for the nine county San Francisco Bay Area Region, California. Digital Q3 Flood Data has been developed by scanning the existing FIRM hardcopy and vectorizing a thematic overlay of flood risks. The Federal Emergency Management Agency (FEMA) produced two flood map products using Geographic Information System (GIS) technology in support of the National Flood Insurance Program: 1) Q3 Flood Data; and 2) Digital Flood Insurance Rate Maps (DFIRMs). As part of Flood Map Modernization, FEMA will now only update or produce DFIRMs. The digital Q3 Flood Data product was designed to: 1) Serve the needs of FEMA's Response and Recovery activities after flood disaster; 2) Promote flood insurance policy marketing initiatives; and 3) Assist in floodplain management activities at the local level. The vector Q3 Flood Data files contain only certain features from the existing FIRM hardcopy. The State of California and the Resources Agency make no representations or warranties regarding the accuracy of data or maps.

  10. n

    North Carolina Effective Flood Zones

    • nconemap.gov
    • hub.arcgis.com
    • +1more
    Updated May 6, 2019
    + more versions
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    State of North Carolina - Emergency Management (2019). North Carolina Effective Flood Zones [Dataset]. https://www.nconemap.gov/maps/a178aae74ee347d786e853e5a442eea2
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    Dataset updated
    May 6, 2019
    Dataset authored and provided by
    State of North Carolina - Emergency Management
    Area covered
    Description

    North Carolina Effective Flood zones: In 2000, the Federal Emergency Management Agency (FEMA) designated North Carolina a Cooperating Technical Partner State, formalizing an agreement between FEMA and the State to modernize flood maps. This partnership resulted in creation of the North Carolina Floodplain Mapping Program (NCFMP). As a CTS, the State assumed primary ownership and responsibility of the Flood Insurance Rate Maps (FIRMs) for all North Carolina communities as part of the National Flood Insurance Program (NFIP). This project includes conducting flood hazard analyses and producing updated, Digital Flood Insurance Rate Maps (DFIRMs). Floodplain management is a process that aims to achieve reduced losses due to flooding. It takes on many forms, but is realized through a series of federal, state, and local programs and regulations, in concert with industry practice, to identify flood risk, implement methods to protect man-made development from flooding, and protect the natural and beneficial functions of floodplains. FIRMs are the primary tool for state and local governments to mitigate areas of flooding. Individual county databases can be downloaded from https://fris.nc.gov Updated Jan 17th, 2025.

  11. M

    FEMA Digital Flood Rate Insurance Maps (DFIRM), Minnesota

    • gisdata.mn.gov
    • data.wu.ac.at
    fgdb, gpkg, html +2
    Updated Jul 4, 2025
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    Natural Resources Department (2025). FEMA Digital Flood Rate Insurance Maps (DFIRM), Minnesota [Dataset]. https://gisdata.mn.gov/dataset/water-dnr-fema-dfirm
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    gpkg, jpeg, shp, html, fgdbAvailable download formats
    Dataset updated
    Jul 4, 2025
    Dataset provided by
    Natural Resources Department
    Area covered
    Minnesota
    Description

    The Federal Emergency Managment Agency and the MNDNR produce Digital Flood Insurance Rate Maps (DFIRM) for selected counties in the state. These maps are often referred to as FEMA Floodplain maps.

    A DFIRM is the offical digital map of a community on which FEMA has delineated the special flood hazard areas, i.e., the floodplain areas where flood insurance is required for loans and where communities will administer floodplain regulations. (Note: Communities may regulate additional flood prone areas that are not on the FIRM).

    Here are some of the feature classes included in the MNDNR's publication of the DFIRM Dataset:

    FEMA DFIRM Base Flood Elevations
    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 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.

    FEMA DFIRM Flood Hazard Zones
    FEMA flood hazard delineations are used by FEMA to designate the SFHA and for insurance rating purposes. These data are the flood hazard areas that are or will be depicted on the FIRM.

    FEMA DFIRM Panel Scheme Polygons
    This layer contains information about the FIRM panel areas. The spatial entities representing FIRM panels are polygons. The polygon for the FIRM panel corresponds to the panel neatlines. As a result, the panels are generally rectangular. In situations where a portion of a panel lies outside of the jurisdiction being mapped, the user must refer to the S_POL_AR table to determine the portion of the panel area where the DFIRM database shows the effective flood hazard data for the mapped jurisdiction.

    FEMA DFIRM Cross Sections
    FEMA Cross Sections are required for any Digital Flood Insurance Rate Map database where cross sections are shown on the FIRM. Normally any FIRM that has associated flood profiles has cross sections. The corresponding attribute table contains information about cross section lines. A spatial file with locational information also corresponds with this data table. These lines represent the locations of channel surveys performed for input into the hydraulic model used to calculate flood elevations. These locations are also shown on the Flood Profiles in the Flood Insurance Study (FIS) report and can be used to cross reference the Flood Profiles to the planimetric depiction of the flood hazards. All cross sections for which a spatial location is available should be included in this table. The spatial elements representing cross sections are lines generally extending from outside the floodplain, across the entire floodplain and out the other side. Each cross section should be represented by a single line feature without the hexagons shown on each end on the hardcopy map. The location and shape of the lines should depict as accurately as possible the position of the cross section used. This is a modified Standard DFIRM Database table that includes Standard DFIRM Database items and Enhanced Database items. All items after SOURCE_CIT are Enhanced. The Enhanced DFIRM Database must contain all modeled cross sections, whether they are printed on the FIRM or not.

    Extensive information regarding the source data can be found in these two documents:
    FEMA DFIRM Doc Appendix L Part A.pdf
    FEMA DFIRM Doc Appendix L Part B.pdf

  12. w

    Flood Insurance Rate Maps and Base Flood Elevations, FIRM, DFIRM, BFE -...

    • data.wu.ac.at
    xml
    Updated Aug 19, 2017
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    NSGIC State | GIS Inventory (2017). Flood Insurance Rate Maps and Base Flood Elevations, FIRM, DFIRM, BFE - FLOODPLAINS_FIRM_IDNR_IN: FIRM Floodplains and Flood Hazard Zones in Indiana (Indiana Department of Natural Resources, 1:12,000, Polygon Shapefile) [Dataset]. https://data.wu.ac.at/schema/data_gov/YzRjM2MwMWMtZmRjYy00Y2ViLWI2MDEtNjk2MTIwZDY3ZjYz
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    xmlAvailable download formats
    Dataset updated
    Aug 19, 2017
    Dataset provided by
    NSGIC State | GIS Inventory
    Area covered
    6a8584dbadae04337430ca864190756e77a85128
    Description

    This polygon layer represents floodplains created from FEMA Flood Rate Insurance Maps (FIRM). The layer can be symbolized to show the following flood hazard categories: Areas that are "Floodways" - (FLD_ZONE = 'AE' and FLOODWAY = 'Floodway') Areas of "1 % Risk" (aka 100-year flood zone) - (FLD_ZONE = 'A%' and FLOODWAY = '') Areas of "0.2 % Risk" (aka 500-year Flood Zone) - (FLD ZONE = '0.2 PCT ANNUAL CHANCE FLOOD HAZARD' and FLOODWAY = '') IDNR documentation states -  This database is an interim version of the Digital Flood Insurance Rate Map (DFIRM) Database. It does not fully meet all DFIRM specifications as found in  Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix L: Guidance for Preparing Draft Digital Data and DFIRM Database . "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 the Federal Emergency Management Agency (FEMA). The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000. "The DFIRM Database presents the flood risk information depicted on the FIRM in a digital format suitable for use in electronic mapping applications. The DFIRM database is a subset of the Digital FIS database that serves to archive the information collected during the FIS.Â

  13. a

    US Virgin Islands - Advisory Flood Hazard Resources Map

    • gis-fema.hub.arcgis.com
    • hub.arcgis.com
    Updated Apr 26, 2018
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    FEMA AGOL (2018). US Virgin Islands - Advisory Flood Hazard Resources Map [Dataset]. https://gis-fema.hub.arcgis.com/maps/a92ce1763cb5416dafa01b84757a5af9
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    Dataset updated
    Apr 26, 2018
    Dataset authored and provided by
    FEMA AGOL
    Area covered
    Description

    FEMA, as the administrator of the National Flood Insurance Program (NFIP), has created Advisory Base Flood Elevations (ABFEs) and storm erosion areas for the United States Virgin Islands (USVI). The ABFE information, storm erosion data, and related layers depicted on this web service for the USVI can serve as a guide to understanding current flood and erosion hazard conditions that communities should build to in order to reduce impacts of similar events in the future. All elevations included on the map are referenced to the Virgin Island Vertical Datum of 2009 (VIVD 09).Data DownloadGIS data and PDF maps that support this web map can be downloaded at the locations indicated below:GIS Data in shapefile format can be downloaded by clicking hereGIS Data in ESRI's File GeoDatabase format can be downloaded by clicking herePDF Maps:Map panels for the entire territory, in Portable Document Format (PDF) can be downloaded by clicking here. The downloaded zip file contains map panels for the entire study area. A grid of all map panels (panel index) in PDF format for St.Thomas and St.John can be accessed here.A grid of all map panels (panel index) in PDF format for St.Croix can be accessed here.Individual map panels can be accessed directly from the map viewer, by locating the panel of interest and by clicking on the panel to activate a pop-up that contains the link to the panel.

  14. b

    Floodplains

    • open-data.bouldercolorado.gov
    • hub.arcgis.com
    Updated Aug 5, 2021
    + more versions
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    BoulderCO (2021). Floodplains [Dataset]. https://open-data.bouldercolorado.gov/maps/bfc343d63cf54831810b983b36ce6872
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    Dataset updated
    Aug 5, 2021
    Dataset authored and provided by
    BoulderCO
    Area covered
    Description

    Regulatory floodplains are extracted from FEMA or provided by consultants to the City. Non regulatory floodplains are provided by consultants, but their accuracy is not guaranteed.FEMA floodplains can either be amended by Letters of Map Revision (LOMR), or Physical Map Revisions (PMR). Historic data between 7/17/1978 and 5/31/2018 rely on PMRs to FIRM Panels; from 5/31/2018 onwards, FEMA exposed a web API that made tracking LOMRs much easier. This is why changes to the floodplain after this date look more "piecemeal" rather than entirely replaced. FEMA Floodplains are automatically updated by a scripted process on a monthly basis.High Hazard Zones are solely recognized by the city as areas which represent the highest risk to loss of life. More information can be found here. These zones are delineated by engineering firms on behalf of the city. They are updated manually by GIS staff.Non-Regulatory Floodplains are updated infrequently.Data: Records with Null INEFFDATEs are the current floodplains.FLOODZONEs beginning with "A" have a 1% chance of flooding (e.g. the 100 Year floodplain)FLOODZONEs equal to "X" are areas with a 0.2% chance of flooding (e.g. the 500 Year floodplain)FLOODZONEs equal to "HHZ" are the High Hazard ZonesFLOODWAYs equal to 1 are Conveyance Zones

  15. d

    Inundation layers for the Coastal basins for the August and September 2017...

    • catalog.data.gov
    • data.usgs.gov
    • +2more
    Updated Jul 6, 2024
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    U.S. Geological Survey (2024). Inundation layers for the Coastal basins for the August and September 2017 flood event in Texas [Dataset]. https://catalog.data.gov/dataset/inundation-layers-for-the-coastal-basins-for-the-august-and-september-2017-flood-event-in-
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    Dataset updated
    Jul 6, 2024
    Dataset provided by
    United States Geological Surveyhttp://www.usgs.gov/
    Area covered
    Texas
    Description

    Hurricane Harvey made landfall near Rockport, Texas on August 25 as a category 4 hurricane with wind gusts exceeding 150 miles per hour. As Harvey moved inland the forward motion of the storm slowed down and produced tremendous rainfall amounts to southeastern Texas and southwestern Louisiana. Historic flooding occurred in Texas and Louisiana as a result of the widespread, heavy rainfall over an 8-day period in Louisiana in August and September 2017. Following the storm event, U.S. Geological Survey (USGS) hydrographers recovered and documented 2,123 high-water marks in Texas, noting location and height of the water above land surface. Many of these high-water marks were used to create flood-inundation maps for selected communities of Texas that experienced flooding in August and September, 2017. The mapped area boundary, flood inundation extents, depth rasters, and coastal surge layer were created to provide an estimated extent of flood inundation in Coastal basins including East and West Matagorda Bay Subbasins, East and West San Antonio Bay Subbasins, and Aransas Bay Subbasin, Texas. The mapped area of the Coastal basins were separated into three sections based on the availability and location of high-water marks. The maps of the eastern part of the East Matagorda Bay Subbasin include a 17-mi reach of Peyton Creek and a 16-mi reach of Big Boggy Creek, and flood-inundation map for 6-mi reach of Little Boggy Creek in Matagorda County. The maps of the western part of East Matagorda Bay Subbasin include a 13.5-mi reach of West Carancahua Creek, 14.5-mi reach of East Carancahua Creek, and 9.6-mi reach of Keller Creek within Matagorda, Jackson, and Calhoun Counties. The maps of the middle part of the East Matagorda Bay Subbasin are for a 21-mi reach of the Tres Palacios River within Matagorda County. These geospatial data include the following items: 1. bnd_emb1, bnd_emb2, and bnd_tres_palacios; shapefiles containing the polygon showing the mapped area boundary for the Coastal basins flood maps, 2. hwm_emb_1, hwm_emb2, and hwm_tres_palacios; shapefiles containing high-water mark points used for inundation maps, 3. polygon_emb1, polygon_emb_2, and polygon_tres_palacios; shapefiles containing mapped extent of flood inundation for the Coastal basins, derived from the water-surface elevation surveyed at high-water marks, 4. depth_emb1, depth_emb2, and depth_tres; raster files for the flood depths derived from the water-surface elevation surveyed at high-water marks, and 5. coastal_surge.lyr; a layer file generated from the depth raster depicting water height above ground recorded at the high-water marks. The upstream and downstream mapped area extent is limited to the upstream-most and downstream-most high-water mark locations. In areas of uncertainty of flood extent, the mapped area boundary is lined up with the flood inundation polygon extent. The mapped area boundary polygon was used to extract the final flood inundation polygon and depth raster from the water-surface elevation raster file. Depth raster files were created using the "Topo to Raster" tool in ArcMap (ESRI, 2012). The HWM elevation data from the USGS Short-tern Network (STN) was used to create the flood water-surface raster file (U.S. Geological Survey [USGS], 2018, Short-Term Network Data Portal: USGS flood information web page, accessed February 13, 2018, at https://water.usgs.gov/floods/FEV.). The water-surface raster was the basis for the creation of the final flood inundation polygon and depth layer to support the development of flood inundation map for the Federal Emergency Management Agency's (FEMA) response and recovery operations.

  16. t

    Floodplains - Cross-sections

    • gisdata.tucsonaz.gov
    Updated Mar 9, 2022
    + more versions
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    City of Tucson (2022). Floodplains - Cross-sections [Dataset]. https://gisdata.tucsonaz.gov/datasets/floodplains-cross-sections
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    Dataset updated
    Mar 9, 2022
    Dataset authored and provided by
    City of Tucson
    Area covered
    Description

    fp_bfe displays the flood hazard elevation contours that indicate the water surface elevation resulting from a flood that has a 1% chance of equaling or exceeding that level in any given year (100-year flood). See more information.This layer is maintained by Pima County. Click here to visit Pima County's Open Data site. Click here to visit Pima County's GIS Library metadata. PurposeThis layer was developed to show FEMA flood zone cross sections in Pima County, Arizona.Dataset ClassificationLevel 0 - OpenKnown UsesThis layer is not in any known applications.Known Errors Unlettered FEMA Cross-sections are identified with a -99 value in the CS_ALPHA field. Unlettered cross-sections are not displayed on MapGuide.12/2013: While this layer is maintained as a Shapefile, the coverage format is still required for certain nightly processing. See Steve Whitney. - FEMA floodplain data extraction processContactPima County - GISdata@pima.govUpdate FrequencyAs Needed

  17. t

    COT Flood Hazards - Open Data

    • gisdata.tucsonaz.gov
    • data-cotgis.opendata.arcgis.com
    • +1more
    Updated Aug 2, 2018
    + more versions
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    City of Tucson (2018). COT Flood Hazards - Open Data [Dataset]. https://gisdata.tucsonaz.gov/datasets/cot-flood-hazards-open-data
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    Dataset updated
    Aug 2, 2018
    Dataset authored and provided by
    City of Tucson
    Area covered
    Description

    This data contains City of Tucson mapped flood hazard areas. Circa 2007 - Shapefile created by consultant JE Fuller who was hired by the City to map non-FEMA flood hazards. It is a composite of the city's old Flood Hazard Zones and the new Flood Hazard Zones. Began by TDOT in the 70's and 80's, added to by Frank (some from JE Fuller study) to display areas that could flood but are too small to be looked at by FEMA.PurposeLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.Dataset ClassificationLevel 0 - OpenKnown UsesThis layer is intended to be used in the City of Tucson's Open Data portal and not for regular use in ArcGIS Online, ArcGIS Enterprise or other web applications.Known ErrorsLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.Data ContactLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.Update FrequencyLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

  18. s

    Flood Zones and Floodways: Humboldt County, California, 2015

    • searchworks.stanford.edu
    zip
    Updated Oct 17, 2019
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    (2019). Flood Zones and Floodways: Humboldt County, California, 2015 [Dataset]. https://searchworks.stanford.edu/view/zc435wh8550
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    zipAvailable download formats
    Dataset updated
    Oct 17, 2019
    Area covered
    Humboldt County, California
    Description

    This polygon shapefile depicts Modified Federal Emergency Management Agency (FEMA) Q3 Flood Data merged with Floodway Data. This coverage displays floodplain areas 100 (Zone=A) and 500 (Zone=B) year floods. These maps blank out federal and state owned lands so the flood hazard in (for instance) State or National Parks is not properly represented. Also depicts Floodway areas. The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the FEMA. The file is georeferenced to the earth's surface using the geographic projection and the decimal degree coordinate system. The specifications for the horizontal control of Q3 Flood Data files are consistent with those required for mapping at a scale of 1:24000. These data have been modified by Humboldt County to better match other base datasets.

  19. a

    Flood Hazard Areas - 1% Annual Chance

    • data-stlcogis.opendata.arcgis.com
    Updated Jul 8, 2015
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    Saint Louis County GIS Service Center (2015). Flood Hazard Areas - 1% Annual Chance [Dataset]. https://data-stlcogis.opendata.arcgis.com/maps/2082093545ed4f9589236a5ce9bcc36c
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    Dataset updated
    Jul 8, 2015
    Dataset authored and provided by
    Saint Louis County GIS Service Center
    Area covered
    Description

    Open Data. Flood Hazard Areas in St. Louis County, Missouri. Flood Hazard Areas defined by FEMA as 1% annual chance of flooding and 26% chance over the life of a 30-year mortgage. These data were officially adopted by FEMA as of February 2015. Link to Metadata.

  20. d

    Floodplain Mapping Submission for Village of Dansville, Livingston County,...

    • datadiscoverystudio.org
    Updated Nov 14, 2017
    + more versions
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    (2017). Floodplain Mapping Submission for Village of Dansville, Livingston County, NY. [Dataset]. http://datadiscoverystudio.org/geoportal/rest/metadata/item/ec49c94d9b024d44b203665034fca788/html
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    Dataset updated
    Nov 14, 2017
    Area covered
    Dansville
    Description

    description: The Floodplain Mapping/Redelineation study deliverables depict and quantify the flood risks for the study area. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The Floodplain Mapping/Redelineation flood risk boundaries are derived from the engineering information 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 the Federal Emergency Management Agency (FEMA). Michael Baker Jr. Alexandria office received 2 paper site-plans for the Dansville/Sparta NY Industrial Park from BME Associates, Doug B. Eldred, P.E. as a better source of contours compared to the original topographic study used in the current effective maps. The site-plans were scanned into a TIF, geo-referenced and fit to the Sparta base-map data. A Michael Baker engineer used the contours on the site-plans to adjust the floodplain boundary to match the contours in the Industrial Park. An individual shape file was created just for the Industrial Park area.; abstract: The Floodplain Mapping/Redelineation study deliverables depict and quantify the flood risks for the study area. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The Floodplain Mapping/Redelineation flood risk boundaries are derived from the engineering information 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 the Federal Emergency Management Agency (FEMA). Michael Baker Jr. Alexandria office received 2 paper site-plans for the Dansville/Sparta NY Industrial Park from BME Associates, Doug B. Eldred, P.E. as a better source of contours compared to the original topographic study used in the current effective maps. The site-plans were scanned into a TIF, geo-referenced and fit to the Sparta base-map data. A Michael Baker engineer used the contours on the site-plans to adjust the floodplain boundary to match the contours in the Industrial Park. An individual shape file was created just for the Industrial Park area.

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ShareGIS NY (2023). FEMA National Flood Hazard Layer Viewer [Dataset]. https://data.gis.ny.gov/datasets/fema-national-flood-hazard-layer-viewer

FEMA National Flood Hazard Layer Viewer

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Dataset updated
Mar 29, 2023
Dataset authored and provided by
ShareGIS NY
Description

The National Flood Hazard Layer (NFHL) is a geospatial database that contains current effective flood hazard data. FEMA provides the flood hazard data to support the National Flood Insurance Program. You can use the information to better understand your level of flood risk and type of flooding.The NFHL is made from effective flood maps and Letters of Map Change (LOMC) delivered to communities. NFHL digital data covers over 90 percent of the U.S. population. New and revised data is being added continuously. If you need information for areas not covered by the NFHL data, there may be other FEMA products which provide coverage for those areas.In the NFHL Viewer, you can use the address search or map navigation to locate an area of interest and the NFHL Print Tool to download and print a full Flood Insurance Rate Map (FIRM) or FIRMette (a smaller, printable version of a FIRM) where modernized data exists. Technical GIS users can also utilize a series of dedicated GIS web services that allow the NFHL database to be incorporated into websites and GIS applications. For more information on available services, go to the NFHL GIS Services User Guide.You can also use the address search on the FEMA Flood Map Service Center (MSC) to view the NFHL data or download a FIRMette. Using the “Search All Products” on the MSC, you can download the NFHL data for a County or State in a GIS file format. This data can be used in most GIS applications to perform spatial analyses and for integration into custom maps and reports. To do so, you will need GIS or mapping software that can read data in shapefile format.FEMA also offers a download of a KMZ (keyhole markup file zipped) file, which overlays the data in Google Earth™. For more information on using the data in Google Earth™, please see Using the National Flood Hazard Layer Web Map Service (WMS) in Google Earth™.

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