View In:   ArcGIS Online Map Viewer

Name: Effective FEMA Floodplain

Display Field: DFIRM_ID

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This Digital Flood Insurance Rate Map (D-FIRM) database presents the flood risk information depicted on Maryland's Flood Insurance Rate Maps (FIRMs) in a digital format suitable for use in electronic mapping applications. The primary risk classifications used are the 1-percent-annual-chance flood event (100-year storm), the 0.2-percent-annual- chance flood event (500-year storm), and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), 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 the Federal Emergency Management Agency (FEMA). This D-FIRM database contains up to date information as of the publish date, however FEMA continuously makes updates including adoption of new and revised maps. When FEMA makes updates they will be reflected immediately in FEMA's Map Service Center; MDE will soon after reflect those updates on mdfloodmaps.net. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.Last Updated: 5/14/2025

Copyright Text: MD iMAP, MDE, MES, FEMA

Default Visibility: true

MaxRecordCount: 36000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0.0

Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports ValidateSQL: true

Supports Calculate: true

Supports Datum Transformation: true

Extent:

XMin: -8848409.3822
YMin: 4566866.133100003
XMax: -8353651.509400001
YMax: 4825772.370399997
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

Drawing Info:

Renderer:
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Field 2: ZONE_SUBTY
Field 3: N/A
Field Delimiter: ,
Default Symbol:
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Default Label: N/A
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Labeling Info:

Advanced Query Capabilities:

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Supports Sql Expression: true
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Supports Returning Geometry Centroid: true
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
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Supports Query Analytic: true
Supports Query With Current User: true

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: FLD_ZONE

Fields:

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• SFHA_TF ( type: esriFieldTypeString, alias: Special Flood Hazard Area, editable: true, nullable: true, length: 1, defaultValue: null, modelName: SFHA_TF )
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---

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---

Capabilities: Query

Sync Can Return Changes: false

Is Data Versioned: false

Supports Rollback On Failure: true

Supports ApplyEdits With Global Ids: false

Supports Query With Historic Moment: false

Supports Coordinates Quantization: true

Child Resources:   Field Groups   Contingent Values

Supported Operations:   Query   Query Analytic   Validate SQL   Generate Renderer   Return Updates   Iteminfo   Thumbnail   Metadata   Update Metadata