Name: Sub-watershed of RI HUC 12 Watershed Boundary Delineations

Display Field: HU_12_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Impervious surfaces such as paved roads, parking lots, and building roofs can affect the natural streamflow patterns and ecosystems of nearby streams. This dataset summarizes the percentage of impervious area for watersheds across Rhode Island by using an available statewide 30-m binary raster dataset of impervious surface for 2001. In order to accurately capture the wide spatial variability of impervious surface, it was necessary to delineate a new set of finely discretized basin boundaries for Rhode Island. This new set of basins was delineated at a scale finer than that of the existing 12-digit Hydrologic Unit Code basins (HUC-12s) of the national Watershed Boundary Dataset. The dataset consists of two GIS shapefiles. The Rhode Island nested subbasins and the units data layers consist of topographically delineated boundaries and their associated percentage of impervious cover for all of Rhode Island region. Subbasin and unit basins were delineated statewide. For the purpose of this study, a subbasin is defined as the entire drainage area upstream of an outlet point. Larger downstream subbasin polygons comprises all of the smaller upstream subbasin polygons. A unit is the intervening drainage area between any given outlet point and the outlet point of the next upstream unit. Units divide subbasins into discrete, nonoverlapping areas. Each unit area comprises the area found between it's outlet point and the the next outlet point upstream. The unit does not include the area above the upstream outlet point which contributes to the same upstream outlet point. Subbasins outlet point locations share the same unique identifier number in the unit shapefile's attribute table. It should be noted unlike U.S. Geological Survey Data Series report DS 451, there are additional unit basins than subbasins. Although the unique identifer is consistent between the spatial datasets, there exists more unit basins than subbasins, because of the coastal geomorphology of Rhode Island. An explanation regarding the reason for more unit basins can be read within the spatial data metadata for both shapefiles (subbasins, and unit basins).UPDATE - March 2014RIDEM added new attributes, Impaired & SRPW to indicate those watersheds containing either an Impaired Waterbody or a State Designated Special Resource Protection Waterbody

Copyright Text: Funding for this dataset was provided by the Environmental Projection Agency and the U.S. Geological Survey.

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Supported Query Formats: JSON, geoJSON, PBF

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Extent:

XMin: -8008156.280221632
YMin: 5034802.00979562
XMax: -7910426.221338244
YMax: 5194521.559495212
Spatial Reference: 102100  (3857)

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Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• OUTLET_ID ( type: esriFieldTypeSmallInteger, alias: OUTLET_ID )
• SUBBASIN ( type: esriFieldTypeString, alias: SUBBASIN, length: 49 )
• HUC_8 ( type: esriFieldTypeString, alias: HUC_8, length: 8 )
• HUC_12 ( type: esriFieldTypeString, alias: HUC_12, length: 12 )
• HU_12_NAME ( type: esriFieldTypeString, alias: HU_12_NAME, length: 80 )
• IMPERVIOUS ( type: esriFieldTypeDouble, alias: IMPERVIOUS )
• SQUARE_MI ( type: esriFieldTypeDouble, alias: SQUARE_MI )
• Impaired ( type: esriFieldTypeString, alias: Impaired, length: 4 )
• SRPW ( type: esriFieldTypeString, alias: SRPW, length: 4 )
• Cold ( type: esriFieldTypeString, alias: Cold, length: 4 )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Shape.STArea() ( type: esriFieldTypeDouble, alias: Shape.STArea() )
• Shape.STLength() ( type: esriFieldTypeDouble, alias: Shape.STLength() )

Supported Operations:   Query   Generate Renderer   Return Updates

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