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This document provides metadata for the state and 8 digit hydrologic unit boundaries intended for national, regional, and state level analysis in the United States.
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How to fill out State and 8 Digit Hydrologic Unit Boundaries for the Conterminous United States

01
Identify the state you are working with.
02
Locate a reliable reference that provides the boundaries of hydrologic units (HUCs) for your state.
03
Determine the 8-digit code that corresponds to the hydrologic unit you are interested in.
04
Fill out the form or database with the state information in the appropriate field.
05
Enter the 8-digit hydrologic unit code in the specified field.

Who needs State and 8 Digit Hydrologic Unit Boundaries for the Conterminous United States?

01
Researchers studying water resources and hydrology.
02
Environmental agencies and regulatory bodies.
03
Urban planners and developers specializing in land use.
04
Conservation organizations focused on watershed management.
05
Government entities responsible for water management and policy.
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People Also Ask about

The Hydrologic Unit Code (HUC) 8 is a mid-level watershed unit in the national Watershed Boundary Dataset. HUC 8 delineations are at the subbasin level.
Hydrologic Units (HUs) represent the area of the landscape that drains to a portion of the stream network. Each drainage has a unique Hydrologic Unit Code (HUC). The most current national HU dataset is the Watershed Boundary Dataset (WBD).
"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.
Hydrologic Unit Codes (HUCs) Watersheds are delineated by USGS using a nationwide system based on surface hydrologic features.
Hydrologic unit system (United States) NameLevelExample name Region 1 Pacific Northwest Subregion 2 Lower Snake Basin 3 Lower Snake Subbasin 4 Imnaha River2 more rows
HUC (pronounced “huck”) is an acronym that stands for Hydrologic Unit Codes, and is often present in discussions about watersheds and water quality.

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State and 8 Digit Hydrologic Unit Boundaries refer to the delineation of watershed areas across the Conterminous United States, where each unit is identified by a unique 8-digit code. These boundaries help in hydrological studies and resource management.
Government agencies, researchers, and organizations involved in environmental management, hydrology, and land use planning are often required to file and report on these boundaries.
To fill out the boundaries, one must accurately map the watershed areas using geographic information systems (GIS) and ensure each hydrologic unit is assigned the correct 8-digit code as per the established guidelines.
The purpose is to provide a standardized framework for hydrological analysis, resource management, and environmental planning by facilitating clear delineation of water resources across regions.
Reported information typically includes the 8-digit hydrologic unit code, the name of the watershed, geographic coordinates, land use details, and hydrological data relevant to each unit.
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