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Layer: Base Flood Elevations (visible at 1:36000) (ID: 0)

Name: Base Flood Elevations (visible at 1:36000)

Display Field: GIS_CREATO

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: This dataset contains information about the Base Flood Elevations (BFE) within a study area of Polk County, FL. 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_SEP09.shp layer. The dataset was downloaded in its original form from the Florida Geographic Data Library (FGDL) website:, in the NAD 1983 Florida StatePlane West FIPS 0902 (Feet) coordinate system and datum, and clipped to the Polk County, FL boundary by a Polk County GIS Analyst.The dataset was downloaded 2010-09.

Definition Expression: N/A

Copyright Text: Florida Geographic Data Library (FGDL) & Federal Emergency Management Agency (FEMA).

Default Visibility: true

MaxRecordCount: 1000

Supported Query Formats: JSON, AMF

Min Scale: 36073

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: false

Can Scale Symbols: false

Use Standardized Queries: true

Drawing Info:
HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Supported Operations:   Query   Generate Renderer   Return Updates