Description: Normally, any FIRM that has associated flood profiles has cross sections. The S_XS table contains information about cross section lines. These lines usually represent the locations of channel surveys performed for input into the hydraulic model used to calculate flood elevations. Sometimes cross sections are interpolated between surveyed cross sections using high accuracy elevation data. Depending on the zone designation (Zone AE, Zone A, etc.), these locations may be shown on Flood Profiles in the FIS report and can be used to cross reference the Flood Profiles to the planimetric depiction of the flood hazards. This information is used in the Floodway Data Tables in the FIS report, as well as on the FIRM panels. This is a subset filtered for the City of Independence Missouri and surrounding region. Fields and Descriptions:Field Name Alias DescriptionOBJECTID OBJECTID Internal feature IDDFIRM_ID DFIRM_ID Unique ID for the Digital FIRM versionVERSION_ID VERSION_ID Version of the flood hazard datasetXS_LN_ID XS_LN_ID Unique identifier for each cross section lineWTR_NM WTR_NM Water body name (e.g., stream or river)STREAM_STN STREAM_STN Distance upstream along the stream (stationing)START_ID START_ID Starting ID point for the cross sectionXS_LTR XS_LTR Letter label shown on FIRMs for cross section (e.g., A, B)XS_LN_TYP XS_LN_TYP Type of cross section (Regulatory, Non-regulatory)WSEL_REG WSEL_REG Water Surface Elevation used for regulatory purposesSTRMBED_EL STRMBED_EL Elevation of the streambed at the cross sectionLEN_UNIT LEN_UNIT Units of measurement (e.g., Feet, Meters)V_DATUM V_DATUM Vertical datum (e.g., NAVD88) used for elevation referencesPROFXS_TXT PROFXS_TXT Description or label for the modeled flood profileMODEL_ID MODEL_ID ID of the hydraulic model usedSEQ SEQ Sequence order of cross sections along the streamSOURCE_CIT SOURCE_CIT Citation for data/model sourceSHAPE SHAPE Geometry of the cross section as a polylineGFID GFID FEMA Global Feature IdentifierGlobalID GlobalID Esri Global ID for feature uniquenessSHAPE.STLength() SHAPE.STLength() Length of the line geometry (in map units)Intended Use:Floodplain managementRegulatory mapping (FIRM)Emergency response planningRisk analysis for insurance and infrastructureCoordinate System:Matches NFHL service – typically NAD83 or Web Mercator Auxiliary Sphere (projected). This subset has been converted to Missouri State Plane West (2403)Publisher & Publish DateFederal Emergency Management Agency (FEMA)Published 7-23-2024 https://hazards.fema.gov/arcgis/rest/services/FIRMette/NFHLREST_FIRMette/MapServer/7Contact Information:NFHL Technical Support – FEMA Map Service CenterEmail: FEMA-FIRMette@fema.dhs.gov
Service Item Id: 3e67de20ac1a4b609ba7d39cd4438c7c
Copyright Text: Source: Federal Emergency Management Agency
Use Constraints:
This data is for informational purposes and should not be used for legal, engineering, or surveying purposes. Users should verify all data with official FEMA products and coordinate with local floodplain administrators.
Description: This layer represents FEMA-designated flood hazard zones from the National Flood Hazard Layer (NFHL), derived from Flood Insurance Rate Maps (FIRMs). These zones define areas with different levels of flood risk, such as the 100-year (1% annual chance) and 500-year (0.2% annual chance) floodplains. To support floodplain management, insurance rating, and risk assessment by depicting areas of varying flood risk, as designated in official FEMA flood maps. This is a subset derived from FEMA data published 7-23-2024. Data DetailsData Type: Polygon Feature ClassGeometry Type: esriGeometryPolygonFeature Count: Varies by map extentCoordinate System: Web Mercator Auxiliary Sphere (EPSG: 3857), consistent with FEMA’s hosted services. This extracted data is converted to Missouri State Plane West (2403) for the City of Independence Missouri and surrounding region. Fields and Descriptions:Field Name Alias DescriptionOBJECTID OBJECTID Unique system-generated feature IDFLD_ZONE Flood Zone FEMA-designated flood hazard zone (e.g., AE, X, VE, A, etc.)ZONE_SUBTY Zone Subtype Describes specific subtype or conditions of the flood zoneSFHA_TF Special Flood Hazard "T" if the area is in a Special Flood Hazard Area, otherwise "F"STATIC_BFE Static BFE Base Flood Elevation (if available) in feetV_DATUM Vertical Datum Datum for elevation values, typically NAVD88 or NGVD29DEPTH Flood Depth Depth of flooding above ground in feet (if known)LEN_UNIT Length Units Measurement unit (e.g., "Feet")VELOCITY Velocity Flow velocity in feet per second (if modeled)AR_REVERT AR Revert Zone For Zone AR areas: revert zone designation (if applicable)BFE_REVERT BFE Revert BFE for AR Revert Zone (if applicable)DEP_REVERT Depth Revert Depth for AR Revert ZoneSOURCE_CIT Source Citation Abbreviation for the study that produced this dataDFIRM_ID DFIRM ID Digital FIRM identifierVERSION_ID Version ID Version of the flood mapping dataSHAPE Geometry Polygon geometry representing the flood zoneGFID FEMA Global Feature ID Unique FEMA identifierGlobalID Esri Global ID System-generated unique ID used for data relationshipsSHAPE.STArea() Shape Area Calculated area of the polygon (in map units)SHAPE.STLength() Shape Perimeter Perimeter of the polygon (in map units)Data Source:FEMAhttps://hazards.fema.gov/arcgis/rest/services/FIRMette/NFHLREST_FIRMette/MapServer/8
Service Item Id: 3e67de20ac1a4b609ba7d39cd4438c7c
Copyright Text: Federal Emergency Management Agency (FEMA) – Map Service Center
Website: https://msc.fema.gov
Contact:
FEMA Map Information eXchange (FMIX)
Phone: 1-877-FEMA-MAP (1-877-336-2627)
Email: FEMAMapSpecialist@riskmapcds.com
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