AGENCY: Utah Geospatial Resource Center

SERIES: 27181
TITLE: National hydrography dataset records
DATES: 1997-
ARRANGEMENT: Alphabetical

DESCRIPTION: These records pertain to the National Hydrography Dataset high resolution conflation. The National Hydrography Dataset (NHD) is a comprehensive set of digital spatial data that contains information about surface water features such as lakes, ponds, streams, rivers, springs and wells. Within the NHD, surface water features are combined to form "reaches," which provide the framework for linking water-related data to the NHD surface water drainage network. These linkages enable the analysis and display of these water-related data in upstream and downstream order.

The NHD is based upon the content of USGS Digital Line Graph (DLG) hydrography data integrated with reach-related information from the EPA Reach File Version 3 (RF3). The NHD supersedes DLG and RF3 by incorporating them, not by replacing them. Users of DLG or RF3 will find the National Hydrography Dataset both familiar and greatly expanded and refined.

While initially based on 1:100,000-scale data, the NHD is designed to incorporate and encourage the development of higher resolution data required by many users.

RETENTION

Permanent. Retain for 12 year(s)

DISPOSITION

Transfer to Archives.

RETENTION AND DISPOSITION AUTHORIZATION

Retention and disposition for this series is authorized by Archives general schedule Significant geographic project files, GRS-2609

AUTHORIZED: 01/20/2009

FORMAT MANAGEMENT

Paper: Retain in Office for 2 years and then transfer to State Records Center. Retain in State Records Center for 10 years and then transfer to State Archives with authority to weed.

APPRAISAL

Administrative Historical Legal

The disposition of these records is based on the administrative, historical, and legal need of the AGRC.

PRIMARY DESIGNATION

Public

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