Parent Layer: NFHL Cross Sections

Name: Base Flood Elevations

Display Field: DFIRM_ID

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The spatial elements representing BFE features are lines extending from Special Flood Hazard Area (SFHA) boundary to SFHA boundary. The ends of the BFE lines must be snapped precisely to the SFHA boundary. The Base Flood Elevation (BFE) table is required for any digital data where BFE lines will be shown on the corresponding FIRM, with the exception of newly studied areas where a profile exists. For newly studied areas where a profile exists, the water-surface elevation (BFE value) will be labeled on the cross sections as stored in the FIRM Database S_XS feature class. The use of BFE lines is only required in special cases. BFEs (i.e., cross-section values supplemented with BFE lines where needed) must be shown at appropriate locations to allow map users to accurately interpolate flood elevations both horizontally and vertically. BFEs for ponding and lacustrine areas must be expressed to the 10th of a foot if they have been calculated to that level of precision; otherwise, they should be shown as whole-foot rounded elevations. Unrevised lake and ponding elevations may be converted to 10th foot elevations if supported by technical data on a project-by project basis and if supported by the FEMA Region. BFEs for coastal flood zones must be shown as whole foot elevations. Other examples include; a riverine AE zone without a flood profile in the FIS Report, areas studied with two- dimensional modeling, certain ponding areas and backwater areas off to the side of streams with flood profiles. BFEs may be used for other exceptions at the discretion of the FEMA Project Officer. Any exceptions to these guidelines should be documented in the metadata. The Mapping Partner must avoid overcrowding of the BFE and cross section lines. When a stream is so steep that there are more than four cross sections and / or BFE lines per one inch of map panel distance, determine the best elevation increments to retain clear labeling. </SPAN></P></DIV></DIV></DIV>

Service Item Id: eda1cac5c4174a4b8832ad46def0b5d9

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• SHAPE ( type: esriFieldTypeGeometry, alias: SHAPE )
• 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 )
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