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Watersheds/Subregional_Basins (MapServer)

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Service Description: This service is in mature support as of December 2022. Please replace this service with Connecticut Subregional Drainage Basin from CT DEEP.

Map Name: Subregional Basins


All Layers and Tables

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


Document Info: Supports Dynamic Layers: false

MaxRecordCount: 1000

MaxImageHeight: 4096

MaxImageWidth: 4096

Supported Query Formats: JSON, geoJSON, PBF

Supports Query Data Elements: true

Min Scale: 2500100

Max Scale: 0

Supports Datum Transformation: true

Child Resources:   Info

Supported Operations:   Export Map   Identify   QueryLegends   QueryDomains   Find   Return Updates