Name: FEMA Base Flood Elevations

Display Field: DFIRM_ID

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: This dataset contains information about the Base Flood Elevations (BFE) within a study area. 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. The Base Flood Elevation (BFE) information 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. 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. 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. This dataset is an update to the DFIRM_BFE_DEC21 layer.

Copyright Text: FEMA National Flood Hazard Layer (NFHL) Status https://www.floodmaps.fema.gov/NFHL/status.shtml FEMA Flood Map Service Center: Search All Products https://msc.fema.gov/portal/advanceSearch

Default Visibility: true

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON

Min Scale: 24000

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: true

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -9094197.651595023
YMin: 3326571.390328691
XMax: -9010433.048397293
YMax: 3430494.5006773225
Spatial Reference: PROJCS["WGS_1984_Web_Mercator",GEOGCS["GCS_WGS_1984_Major_Auxiliary_Sphere",DATUM["D_WGS_1984_Major_Auxiliary_Sphere",SPHEROID["WGS_1984_Major_Auxiliary_Sphere",6378137.0,0.0]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],UNIT["Meter",1.0]],VERTCS["Unknown VCS from ArcInfo Workstation",VDATUM["Unknown"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]]

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
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Color: [128, 0, 128, 255]
Width: 2
Label:
Description:
Transparency: 0
Labeling Info:
Label Placement: esriServerLinePlacementAboveAlong
Label Expression: "BFE " CONCAT [DESCRIPT]
Use Coded Values: true
Symbol:
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Outline Color: N/A
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Horizontal Alignment: center
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YOffset: 0
Size: 11
Font Family: Arial
Font Style: normal
Font Weight: bold
Font Decoration: none

Min. Scale: 24000.0
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Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

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 )
• COUNTY ( type: esriFieldTypeString, alias: COUNTY, length: 20 )
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• FGDLAQDATE ( type: esriFieldTypeDate, alias: FGDLAQDATE, length: 8 )
• AUTOID ( type: esriFieldTypeInteger, alias: AUTOID )
• SHAPE ( type: esriFieldTypeGeometry, alias: SHAPE )
• SHAPE.STLength() ( type: esriFieldTypeDouble, alias: SHAPE.STLength() )

Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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