Name: Watershed - 12 digit (DNR)

Display Field: MDE6NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This file is a statewide digital watershed file. It was created primarily for state and federal agency use. The watersheds define Strahler (Strahler 1952 p. 1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watersheds drainage areas were defined for streams less than third order and some large area watershed were split to maintain a maximum size of 15,000 acres. The watershed boundaries in this file were developed in a joint state and federal effort to create a consistent watershed file for use by all government agencies with an interest in Maryland's watersheds. The U.S. Natural Resources Conservation Service (NRCS) redefined the third order watersheds creating the HUA14 file. This file contains all of the HUA14 watersheds and some added watersheds to maintain water quality sampling sites. It was also used to create the Maryland Sub-Watershed file.

Copyright Text: The original eight digit watershed file was created in 1991 from Maryland Department of the Environment (MDE) hardcopy watershed maps. The Maryland Office of Planning (OP) created that digital file by contracting with Daft, McCune and Walker to digitize third order stream watersheds. The U.S. Natural Resources Conservation Service (NRCS) produced the Hydrological Unit Code watershed file HUA14 using the OP file as a base map and redefining watersheds. NCRS field offices verified the watershed boundaries. The Maryland Department of Housing and Community Development Maryland Historic Trust (MHT) provided scanned US Geological Survey (USGS) 7.5 minute quadrangle map sheets to be used as a base map for corrections. The Department of Natural Resources (DNR) corrected the watershed boundaries to the scanned USGS 7.5 minute quadrangle map sheets in cooperation with NRCS. The State political boundary file from Maryland State Highway Administration's (SHA) GRID map series was merged into the file replacing the existing state line. The merge and watershed corrections were completed by DNR.

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Spatial Reference: 103069  (6488)

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Type ID Field: null

Fields:

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• ACRE ( type: esriFieldTypeDouble, alias: Acreage )
• MDE6DIGT ( type: esriFieldTypeString, alias: MDE 6 Digit Code, length: 6 )
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Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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