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Watersheds/Subregional_Basins (MapServer)

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Service Description: A standardized mapping of natural drainage basins in Connecticut was completed in 1981 by the then Connecticut Department of Environmental Protection (DEP). This drainage basin system divided Connecticut into 8 major basins, 45 regional basins, 337 subregional basins, 2,898 local basins, and 7,067 small drainage basin areas. The statewide mapping of natural drainage basins established a hierarchical system of basins based on drainage area size with large major basins subdivided into regional basins, regional basins subdivided into subregional basins, subregional basins subdivided into local basins, and local basins subdivided into smaller and more numerous drainage basin areas. It includes watersheds for Connecticut rivers, streams, brooks, lakes, reservoirs and ponds included on 1:24,000-scale 7.5 minute topographic quadrangle maps published by the U.S. Geological Survey (USGS) between 1969 and 1984. These basin units include smaller watersheds that drain into many of the small streams and ponds in Connecticut. These basin areas are the building blocks for the larger local, subregional, regional and major drainage basins defined by DEP. Connecticut Subregional Drainage Basins includes 337 drainage basin areas, the majority of which range from 5 to 70 square miles in size and make up, in order of increasing size the larger regional and major drainage basin areas. The subregional basin number (SBAS_NO) uniquely identifies individual subregional drainage basins and is 4 characters in length. There are 335 unique subregional basin numbers. Examples include 6000 for the Housatonic River Main Stem Subregional Basin, 4300 for the Farmington River Subregional Basin, and 6002 for the Schenob Brook Subregional Basin. The first digit (column 1) designates the major basin, the first two digits (columns 1-2) designate the regional basin, and the first 4 digits (columns 1-4) designate the subregional basin. Note, there are slightly more subregional basin areas delineated (374) than unique subregional basin numbers (335) primarily due to a few stream confluences that split the same local basin into two areas. Included with the subregional drainage basin boundaries are Subregional Drainage Basins Direction arrows that depict the general direction of surface water flow towards indivicual subregional drainage basin outlets. Theses arrows are meant to indicate where one basin drains into another and are intended aid in visualizing the network of subregional drainage basins in Connecticut. They do not depict the exact location of basin outlets.

Map Name: Subregional Basins

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Layers: Description: Connecticut Subregional Drainage Basins is 1:24,000-scale, polygon and line feature data that define subregional drainage basin areas in Connecticut. These medium size basins mostly range from 5 to 70 square miles in size and make up, in order of increasing size the larger regional, and major drainage basin areas. Connecticut Subregional Drainage Basins includes drainage areas for all Connecticut rivers, streams, brooks, lakes, reservoirs and ponds published on 1:24,000-scale 7.5 minute topographic quadrangle maps prepared by the USGS between 1969 and 1984. Data is compiled at 1:24,000 scale (1 inch = 2,000 feet). This information is not updated. Subregional Basin area (polygon) attributes include major, regional and subregional basin number, and feature size in acres and square miles. The subregional basin number (SBAS_NO) uniquely identifies individual basins and is 4 characters in length. There are 335 unique subregional basin numbers. Examples include 6000, 4300, and 6002. The first digit (column 1) designates the major basin, the first two digits (columns 1-2) designate the regional basin, and the first 4 digits (columns 1-4) designate the subregional basin. Note, there are slightly more subregional basin polygon features (374) than unique subregional basin numbers (335) primarily due to a few stream confluences that split the same local basin into two polygon features. Subregional basin boundary (line) attributes include a drainage divide type attribute (DIVIDE) used to cartographically represent the hierarchical drainage basin system. This divide type attribute is used to assign different line symbology to major, regional, and subregional drainage basin divides. For example, major basin drainage divides are more pronounced and shown with a wider line symbol than regional basin drainage divides. Subregional Drainage Basin Direction is point data used to create directional arrow symbology that depicts the general direction of surface water flow within individual subregional drainage basins. Particular emphasis is given to directional arrows near the location of subregional drainage basin outlets. These aid in the visualizing the network of subregional drainage basins in Connecticut. Point features include an attribute that defines arrow direction. Data is compiled at 1:80,000 scale. Data is intended to be used for cartographic purposes on maps that also depict Subregional Drainage Basin Boundaries. These data do not represent the exact location of basin outlets or stream confluences. Their position is largely based on the need to locate an arrow symbol near each local basin outlet such that it does not interfere or conflict with the placement of other information typically included on a basin map such as highways, local roads, bridges, waterbodies, political boundaries and geographic names. For this reason, some features may be farther away from the basin outlet than others. This information is not intended to accurately represent the hydrologic connectivity of surface water and were not automatically derived from or based on a hydrologic network such as the U.S. Geological Survey National Hydrography Dataset.

Copyright Text: CT DEEP

Spatial Reference: 102100  (3857)


Single Fused Map Cache: false

Initial Extent: Full Extent: Units: esriMeters

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

Document Info: Supports Dynamic Layers: false

MaxRecordCount: 1000

MaxImageHeight: 4096

MaxImageWidth: 4096

Supported Query Formats: JSON, AMF, geoJSON

Min Scale: 2500100

Max Scale: 0



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