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Name: Surface Waters with Impairments 2020 with Quarter Mile Buffer

Display Field: auid

Type: Feature Layer

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><DIV STYLE="font-size:12pt"><P><SPAN>Quarter mile buffer of watersheds clipped to the state border for assessment unit IDs (AUID) that have one or more impairment related to storm water runoff in the 2016 305(b)/303(d). AUID 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.</SPAN></P><P><SPAN /></P><P><SPAN>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. Each quarter mile buffer on an AUIDs was clipped by the watershed for that AUID to remove any non-contributory areas.</SPAN></P></DIV></DIV></DIV></DIV>

Service Item Id: a0eaf2599930482a9baa52432b40599c

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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Type ID Field:

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• fid ( nullable: false, defaultValue: null, editable: false, length: 4, type: esriFieldTypeOID, modelName: fid, alias: fid )
• auid ( modelName: auid, nullable: true, editable: true, defaultValue: null, length: 254, alias: AUID, type: esriFieldTypeString )
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• waterbodyn ( modelName: waterbodyn, nullable: true, editable: true, defaultValue: null, length: 254, alias: Waterbodyn, type: esriFieldTypeString )
• impairment ( modelName: impairment, nullable: true, editable: true, defaultValue: null, length: 254, alias: Impairment, type: esriFieldTypeString )
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• Name: Surface Waters with Impairments 2020 with Quarter Mile Buffer
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