Name: GIS_DATA.SDE_VDEQ_IMPAIRED_WATERS

Display Field: WATER_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The goal of the Clean Water Act (CWA) is "to restore and maintain the chemical, physical, and biological integrity of the Nation's waters" (33 U.S.C §1251(a)). Under section 303(d) of the CWA, states, territories, and authorized tribes, collectively referred to in the act as "states," are required to develop lists of impaired waters. These are waters for which technology-based regulations and other required controls are not stringent enough to meet the water quality standards set by states. The law requires that states establish priority rankings for waters on the lists and develop Total Maximum Daily Loads (TMDLs), for these waters. A TMDL is a calculation of the maximum amount of a pollutant that a water body can receive and still safely meet water quality standards. Under section 303(d), monitoring data as well as other information, must be used by the states to develop a list of "water-quality limited segments," i.e., waters that will not meet water quality standards for a particular pollutant even after a technology-based permit is in place. States must develop TMDLs, or Total Maximum Daily Loads, for every water body/pollutant combination on the 303(d) list. The TMDL calculates the maximum amount of a pollutant allowed to enter a waterbody, also known as the loading capacity, so that the waterbody will meet and continue to meet water quality standards for that particular pollutant. The TMDL allocates that load to point sources, (Wasteload Allocation or WLA), and nonpoint sources (Load Allocation or LA) which include both anthropogenic and natural background sources of the pollutant.

Service Item Id: ebad425983fa462cae61e5c132304b40

Copyright Text: Virginia Department of Environmental Quality. Updated by VDOT GIS January 2021.

Default Visibility: true

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON

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Supports Statistics: true

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Can Modify Layer: true

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Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -9309689.5313
YMin: 4374611.379
XMax: -8396293.0107
YMax: 4784678.8962
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

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Labeling Info:

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Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• ID305B ( type: esriFieldTypeString, alias: ID305B, length: 50 )
• MILES ( type: esriFieldTypeDouble, alias: MILES )
• CYCLE ( type: esriFieldTypeString, alias: CYCLE, length: 4 )
• WATER_NAME ( type: esriFieldTypeString, alias: WATER_NAME, length: 100 )
• LOCATION ( type: esriFieldTypeString, alias: LOCATION, length: 254 )
• CATEGORY ( type: esriFieldTypeString, alias: CATEGORY, length: 10 )
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• ACRES ( type: esriFieldTypeDouble, alias: ACRES )
• SQ_MILES ( type: esriFieldTypeDouble, alias: SQ_MILES )
• VDEQ_IMPH2O_ID ( type: esriFieldTypeInteger, alias: VDEQ_IMPH2O_ID )
• SHAPE ( type: esriFieldTypeGeometry, alias: SHAPE )
• SHAPE.AREA ( type: esriFieldTypeDouble, alias: SHAPE.AREA )
• SHAPE.LEN ( type: esriFieldTypeDouble, alias: SHAPE.LEN )

Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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