Name: Watersheds with Chloride Impairments 2020

Display Field: AUID

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P><SPAN>Watersheds clipped to the state border for assessment unit IDs (AUID) that have been assessed as impaired due to excess chloride in the 2016 305(b)/303(d). AUIDs are nearly synonymous with waterbody IDs (WBIDs) in that WBIDs are continuously updated whereas AUIDs are a version of the features tied to a particular Clean Water Act assessment cycle. AUIDs are the basic unit of record for conducting and reporting water quality assessments to EPA. All assessment units are based on 1:24,000 scale hydrography linked to the National Hydrography Dataset (NHD); the national coverage used by EPA. The 2020 AUIDs were the basis for the delineations in this file. Watersheds were delineated using a10m DEM that had been burned with the 24k NHHD and catchment walled. After automated delineation, watershed received a visual evaluation for reliability</SPAN></P></DIV></DIV></DIV></DIV>

Service Item Id: 7db94e8a04fb466bb1690a81fde4fb7a

Copyright Text: The New Hampshire Department of Environmental Services, Watershed Management Bureau, Water Quality Planning Section, should be acknowledged as the data source in products derived from these data.

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Fields:

• FID ( type: esriFieldTypeOID, alias: FID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• AUID ( type: esriFieldTypeString, alias: AUID, length: 254 )
• QAQC ( type: esriFieldTypeString, alias: QAQC, length: 50 )
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