Parent Layer: Watersheds

Name: WBDHU8

Display Field: name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: 8-Digit Watershed Boundary Data. Hydrologic Unit delineation are closed polygons that encompass all area draining toward the lowest point (called outlet or pour point) in the polygon. Because of varying sizes for the different hydrologic unit levels: some polygons do not include all areas up to the drainage divide, but all areas are included up to one or more other upstream hydrologic units. A unique hydrologic unit code is used to identify each hydrologic unit. The hydrologic unit codes start with the 2-digit Region number that contains the 4-, 6-, and 8-digit hydrologic units. Each hydrologic unit has a unique hydrologic code.The Watershed Boundary Dataset (WBD) defines the areal extent of surface water drainage to a point, accounting for all land and surface areas. Watershed Boundaries are determined solely upon science-based hydrologic principles, not favoring any administrative boundaries or special projects, nor particular program or agency. The intent of defining Hydrologic Units (HU) for the Watershed Boundary Dataset is to establish a base-line drainage boundary framework, accounting for all land and surface areas. At a minimum, the WBD is being delineated and georeferenced to the USGS. "A hydrologic unit is a drainage area delineated to nest in a multi-level, hierarchical drainage system. Its boundaries are defined by hydrographic and topographic criteria that delineate an area of land upstream from a specific point on a river, stream or similar surface waters. 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."Dataset acquired from: https://gdg.sc.egov.usda.gov/. For details see: http://nhd.usgs.gov/wbd.html; http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/; http://datagateway.nrcs.usda.gov/.Federal standards and procedures for WBD: http://pubs.usgs.gov/tm/11/a3/

Service Item Id: 44eeaa3c51234a64af0653039c5c2a25

Copyright Text: USGS, EPA, Solano DoITGIS Services;

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MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

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Supports Advanced Queries: true

Supports Statistics: true

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Supports Datum Transformation: true

Extent:

XMin: -1.3630670979848614E7
YMin: 4579248.622856916
XMax: -1.35349754347422E7
YMax: 4660165.843963564
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

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• shape ( type: esriFieldTypeGeometry, alias: Shape )
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Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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