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Service Description: WMS layer for public consumption. Hydrologic Unit: Watersheds in the United States and the Caribbean were delineated by the U.S. Geological Survey using a national standard hierarchical system based on surface hydrologic features and are classified into four types of hydrologic units: first-field (region), second-field (sub-region), third-field (accounting unit), and fourth-field (cataloguing unit). A fifth-field of classification (watershed) and sixth-field (sub-watershed) are currently under development. The United States and Caribbean are divided into 21 regions, 221 subregions, 378 accounting units, and 2,264 cataloguing units. A hydrologic unit can accept surface water directly from upstream drainage areas, and indirectly from associated surface areas such as remnant, non-contributing, and diversions to form a drainage area with single or multiple outlet points. Hydrologic units are only synonymous with classic watersheds when their boundaries include all the source area contributing surface water to a single defined outlet point. Hydrologic Unit Code: Each hydrologic unit is identified by a unique hydrologic unit code (HUC) consisting of two to twelve digits based on the six levels of classification: 8-digit HUC (Cataloguing Unit) 2-digit HUC first-level (region) 4-digit HUC second-level (subregion) 6-digit HUC third-level (accounting unit) 8-digit HUC fourth-level (cataloguing unit) 10-digit HUC fifth-level (watershed) 12-digit HUC sixth-level (subwatershed). This layer represents the 12-digit HUC sixth-level (subwatershed).

Map Name: Layers

All Layers and Tables

Layers:

• NFHAP HCI Scores by Environmental Drainage Unit (EDU) (0)

Description:

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Spatial Reference: 102113

Single Fused Map Cache: false

Initial Extent:

XMin: -2.445806657957171E7
YMin: 1674765.814679923
XMax: -2936816.534499757
YMax: 1.2007327564714467E7
Spatial Reference: 102113

Full Extent:

XMin: -1.9942020020058244E7
YMin: 2144427.712408766
XMax: -7452863.094013223
YMax: 1.1537665666985624E7
Spatial Reference: 102113

Units: esriMeters

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

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• AntialiasingMode: None
• TextAntialiasingMode: Force

Supported Interfaces:   REST   SOAP   WMS

Supported Operations:   Export Map   Identify   Find   Generate KML