Source: CT DEP
Layer
Name: Basins
Data Coverage: Statewide
Publisher: Connecticut DEP, Environmental and Geographic Information
Center (EGIC)
Publication Date: 1988
Data Collection Scale: 1:24000
Data Collection Date: Delineated during 1978-1988
Update Frequency: Not Updated
Brief Description
This is the 1:24,000-scale datalayer that includes all levels of natural drainage
basins in Connecticut, including major, regional, subregional, and local basins.
All other 1:24,000-scale major, regional, subregional, and local basin datalayers
are derived from this datalayer. The basin datalayer extends beyond the Connecticut
boundary to include the headwaters of every basin that flows into the state,
except for the Connecticut River basin, which extends even further to the north.
Individual Drainage basin lines are classified according to drainage basin arc
code so different types of boundaries can be shown differently based on this
field. Basins in the polygon Shapefile are described in terms of their full
13 digit drainage basin number, 1 digit major basin number, 2 digit regional
basin number, and 4 digit subregional basin number, and 7 digit local basin
number (e.g. 6400-00).
The drainage basin boundaries were originally delineated by interpreting the
contour elevation lines and the hydrography network appearing on the 7½
minute U.S. Geological Survey quadrangle maps that cover Connecticut and published
between 1969 and 1984. This work was conducted by the Environmental and Geographic
Information Center (formally the Natural Resources Center) of DEP and the Connecticut
office of the U.S. Geological Survey.