Name: FEMA Base Flood Elevation

Display Field: DFIRM_ID

Type: Feature Layer

Geometry Type: esriGeometryPolyline

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: a68483bf94994cb9ac6020c324b6f4db

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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Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

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Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• DFIRM_ID ( type: esriFieldTypeString, alias: DFIRM_ID, length: 6 )
• VERSION_ID ( type: esriFieldTypeString, alias: VERSION_ID, length: 11 )
• BFE_LN_ID ( type: esriFieldTypeString, alias: BFE_LN_ID, length: 32 )
• ELEV ( type: esriFieldTypeDouble, alias: ELEV )
• LEN_UNIT ( type: esriFieldTypeString, alias: LEN_UNIT, length: 16 )
• V_DATUM ( type: esriFieldTypeString, alias: V_DATUM, length: 17 )
• SOURCE_CIT ( type: esriFieldTypeString, alias: SOURCE_CIT, length: 21 )
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• last_edited_date ( type: esriFieldTypeDate, alias: last_edited_date, length: 8 )
• GlobalID ( type: esriFieldTypeGlobalID, alias: GlobalID, length: 38 )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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