Layer: Maryland Hydrogeomorphic Regions (ID:70)

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Name: Maryland Hydrogeomorphic Regions

Display Field: HGMR_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Per USGS Open-File Report 2000-424, generalized lithology (rock type) and physiography based on geologic formations were used to characterize hydrogeomorphic regions (HGMR) within the Chesapeake Bay watershed. These HGMRs were used in conjunction with existing data to assess the significance of ground-water discharge as a source of nitrate load to nontidal streams in the Chesapeake Bay watershed (Bachman and others, 1998). This work is part of the U.S. Geological Survey's (USGS) Chesapeake Bay initiative to develop an understanding and provide scientific information for the restoration of the Chesapeake Bay and its watershed (Phillips and Caughron, 1997).

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Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

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Object ID Field: FID

Unique ID Field:

Global ID Field:

Type ID Field: HGMR_NAME

Fields:

FID (type: esriFieldTypeOID, alias: FID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
HGMR (type: esriFieldTypeString, alias: HGMR, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
GRIDCODE (type: esriFieldTypeInteger, alias: GRIDCODE, SQL Type: sqlTypeOther, nullable: true, editable: true)
Shape_Leng (type: esriFieldTypeDouble, alias: Shape_Leng, SQL Type: sqlTypeOther, nullable: true, editable: true)
HGMR_NAME (type: esriFieldTypeString, alias: HGMR_NAME, SQL Type: sqlTypeOther, length: 254, nullable: true, editable: true)
Shape_Le_1 (type: esriFieldTypeDouble, alias: Shape_Le_1, SQL Type: sqlTypeOther, 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:

HGMR_NAME: Appalachian Plateau Carbonate

HGMR_NAME: Appalachian Plateau Siliciclastic

HGMR_NAME: Blue Ridge

HGMR_NAME: Coastal Plain Dissected Uplands

HGMR_NAME: Coastal Plain Lowlands

HGMR_NAME: Coastal Plain Uplands

HGMR_NAME: Mesozoic Lowlands

HGMR_NAME: Open Water

HGMR_NAME: Piedmont Carbonate

HGMR_NAME: Piedmont Crystalline

HGMR_NAME: Valley and Ridge Carbonate

HGMR_NAME: Valley and Ridge Siliciclastic

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 6/24/2025 12:25:00 PM

Schema Last Edit Date: 6/24/2025 12:25:00 PM

Data Last Edit Date: 6/20/2025 7:47:13 PM

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