Layers:

Layer: OC Flood Hazard Reduced Set (6)


Name: OC Flood Hazard Reduced Set

Display Field: DFIRM_ID

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The Federal Emergency Management Agency (FEMA) produces Flood Insurance Rate maps and identifies Special Flood Hazard Areas as part of the National Flood Insurance Program's floodplain management. Special Flood Hazard Areas have regulations that include the mandatory purchase of flood insurance for holders of federally regulated mortgages. In addition, this layer can help planners and firms avoid areas of flood risk and also avoid additional cost to carry insurance for certain planned activities.This layer is derived from the May 7, 2025 version Flood Insurance Rate Map feature class S_FLD_HAZ_AR. The vector data were then flagged with an index of 94 classes, representing a unique combination of values displayed by three renderers. (In three resolutions the three renderers make nine processing templates.) Repair Geometry was run on the set of features, then the features were rasterized using the 94 class index at a resolutions of 10, 30, and 90 meters, using the Polygon to Raster tool and the "MAXIMUM_COMBINED_AREA" option. Projection: Web Mercator Auxiliary SphereData Coordinate System: USA Contiguous Albers Equal Area Conic USGS version (contiguous US, Puerto Rico, US Virgin Islands), WGS 1984 Albers (Alaska), Hawaii Albers Equal Area Conic (Hawaii), Western Pacific Albers Equal Area Conic (Guam, Northern Mariana Islands, and American Samoa)Cell Sizes: 10 meters (default), 30 meters, and 90 metersData Date: May 7, 2025; Version: 2026.1, Updated: March 2026

Copyright Text: Dr. Kostas Alexandridis, GISP, Data Scientist, OC Public Works, OC Survey Geospatial Services for the Orange County data and project extent processing. Original data from FEMA Flood Insurance Rate Maps, and ESRI Living Atlas.

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: -13149034.2872
YMin: 3946801.8274
XMax: -13081939.9977
YMax: 4021561.8374
Spatial Reference: 102100 (3857)


Drawing Info:

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HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Name : OBJECTID

IsSystemMaintained : True


Global ID Field:

Type ID Field: esri_symbology

Fields:
• OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
• DFIRM_ID (type: esriFieldTypeString, alias: DFIRM ID, SQL Type: sqlTypeOther, length: 6, nullable: true, editable: true)
• VERSION_ID (type: esriFieldTypeString, alias: Version ID, SQL Type: sqlTypeOther, length: 8, nullable: true, editable: true)
• FLD_AR_ID (type: esriFieldTypeString, alias: Flood Area ID, SQL Type: sqlTypeOther, length: 32, nullable: true, editable: true)
• STUDY_TYP (type: esriFieldTypeString, alias: Study Type, SQL Type: sqlTypeOther, length: 38, nullable: true, editable: true)
• FLD_ZONE (type: esriFieldTypeString, alias: Flood Zone, SQL Type: sqlTypeOther, length: 17, nullable: true, editable: true)
• ZONE_SUBTY (type: esriFieldTypeString, alias: Flood Zone Subtype, SQL Type: sqlTypeOther, length: 80, nullable: true, editable: true)
• SFHA_TF (type: esriFieldTypeString, alias: Special Flood Hazard Area, True or False, SQL Type: sqlTypeOther, length: 1, nullable: true, editable: true)
• STATIC_BFE (type: esriFieldTypeInteger, alias: Static Base Flood Elevation, SQL Type: sqlTypeOther, nullable: true, editable: true)
• V_DATUM (type: esriFieldTypeString, alias: Vertical Datum, SQL Type: sqlTypeOther, length: 17, nullable: true, editable: true)
• DEPTH (type: esriFieldTypeInteger, alias: Depth, SQL Type: sqlTypeOther, nullable: true, editable: true)
• LEN_UNIT (type: esriFieldTypeString, alias: Length Unit, SQL Type: sqlTypeOther, length: 11, nullable: true, editable: true)
• VELOCITY (type: esriFieldTypeDouble, alias: Velocity, SQL Type: sqlTypeOther, nullable: true, editable: true)
• VEL_UNIT (type: esriFieldTypeString, alias: Velocity Unit, SQL Type: sqlTypeOther, length: 18, nullable: true, editable: true)
• DUAL_ZONE (type: esriFieldTypeString, alias: Dual Zone, SQL Type: sqlTypeOther, length: 1, nullable: true, editable: true)
• SOURCE_CIT (type: esriFieldTypeString, alias: Source Citation, SQL Type: sqlTypeOther, length: 21, nullable: true, editable: true)
• GFID (type: esriFieldTypeString, alias: GFID, SQL Type: sqlTypeOther, length: 40, nullable: true, editable: true)
• esri_symbology (type: esriFieldTypeString, alias: Esri Symbology, SQL Type: sqlTypeOther, length: 50, nullable: true, editable: true)
• Shape__Area (type: esriFieldTypeDouble, alias: Shape__Area, SQL Type: sqlTypeDouble, nullable: true, editable: false)
• Shape__Length (type: esriFieldTypeDouble, alias: Shape__Length, SQL Type: sqlTypeDouble, nullable: true, editable: false)

Types:

ID: 1% Annual Chance Flood Hazard
Name: 1% Annual Chance Flood Hazard
Domains:

Templates:

Name: 1% Annual Chance Flood Hazard
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• esri_symbology: 1% Annual Chance Flood Hazard

---

ID: Regulatory Floodway
Name: Regulatory Floodway
Domains:

Templates:

Name: Regulatory Floodway
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• esri_symbology: Regulatory Floodway

---

ID: 0.2% Annual Chance Flood Hazard
Name: 0.2% Annual Chance Flood Hazard
Domains:

Templates:

Name: 0.2% Annual Chance Flood Hazard
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• esri_symbology: 0.2% Annual Chance Flood Hazard

---

ID: Area with Reduced Risk Due to Levee
Name: Area with Reduced Risk Due to Levee
Domains:

Templates:

Name: Area with Reduced Risk Due to Levee
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• esri_symbology: Area with Reduced Risk Due to Levee

---


Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 3/10/2026 10:10:13 PM

Schema Last Edit Date: 3/10/2026 10:10:09 PM

Data Last Edit Date: 3/10/2026 9:43:35 PM