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2020 Impaired Rivers
FGDC Metadata
DescriptionSpatialData StructureMetadata
+ Resource Description
Information used to reference the data.
Title: 2020 Impaired Rivers
Originators: University of Connecticut, Center for Land Use Education and Research
Publication date: 20200130
Data type: vector digital data
A characterization of the data, including its intended use and limitations.
The stormwater impaired waters layer is based on the 2020 Connecticut Integrated Water Quality Report (IWQR). All waters (rivers, lakes, estuaries) that were listed as impaired (EPA Category 5) in Appendix B-1 of the report and all waters that were listed as having an adopted TMDL in place in Appendix B-2 were identified. Both lists were then compared to the Impaired Waters guidance in Appendix D of the 2017 General Permit for the Discharge of Stormwater from Small Municipal Separate Storm Sewer Systems Reissuance with Modifications. Waters with adopted TMDLs in the 2020 IWQR for the stormwater pollutants of concern listed in Appendix D (phosphorus, nitrogen, bacteria, mercury) of the General Permit and those with a cause listed as ‘Impervious Cover’ were then identified and added to the Stormwater Impaired Waters layer. Impaired waters without a TMDL in the 2020 IWQR were reviewed and those with causes matching the causes listed in Appendix D for each stormwater pollutant of concern were added to the Stormwater Impaired Waters layer. Waters in Appendix B-1 of the IWQR that indicated any of the causes listed for Phosphorus or Nitrogen were listed as impaired for Phosphorus and Nitrogen per DEEP decision. Waters in Appendix B-1 of the IWQR that indicated the impairment cause was ‘Turbidity’ or ‘Unknown’ were listed as impaired for Other pollutant of concern.The resulting list of stormwater impaired waterbodies were then matched up with the Connecticut 303(d) Impaired Waters 2020 (rivers, lakes and estuaries) waterbody features using the waterbody id. Information including stormwater pollutant of concern, cause, impaired designated use and TMDL can be identified by clicking on the layer(s) in the MS4 viewer or with the identify tool in a desktop application. Additional information about Integrated Water Quality reporting is available at the CT DEEP website.
CT 2020 Impaired Rivers is 1:24,000-scale data. It depicts stormwater impaired waters layer is based on the 2020 Connecticut Integrated Water Quality Report (IWQR). This layer should be used with the other assessed waterbody layers: Stormwater Impaired Estuary and Stormwater Impaired Lakes. This layer should only be viewed with other 1:24,000-scale map data such as water quality classifications, roads, towns, topographic quadrangles, and digital orthophotos. Not intended for maps printed at map scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet.)
Dataset credit:
University of Connecticut, Center for Land Use Education and Research (CLEAR) & CT Department of Energy and Environmental Protection
Point Of Contact
Contact information for the individual or organization that is knowledgeable about the data.
Person: University of Connecticut, Center for Land Use Education and Research
Data Type
How the data are represented, formatted and maintained by the data producing organization.
Data type: vector digital data
Native dataset environment: Version 6.2 (Build 9200) ; Esri ArcGIS
Time Period of Data
Time period(s) for which the data corresponds to the currentness reference.
Beginning date: 20200101
Currentness reference:
State of Connecticut. 
The state of and maintenance information for the data.
Data status: Complete
Key Words
Words or phrases that summarize certain aspects of the data.
Keywords: stormwater impairments, MS4, CT, water quality, stormwater, impaired waters, integrated water quality, rivers
Keyword thesaurus: None
Data Access Constraints
Restrictions and legal prerequisites for accessing or using the data after access is granted.
Access constraints:
Use constraints:
+ Spatial Reference Information
Horizontal Coordinate System
Reference system from which linear or angular quantities are measured and assigned to the position that a point occupies.
Coordinate System Details
Map projection
Map projection name: NAD 1983 StatePlane Connecticut FIPS 0600 Feet
Standard parallel: 41.2
Standard parallel: 41.86666666666667
Longitude of central meridian: -72.75
Latitude of projection origin: 40.83333333333334
False easting: 999999.999996
False northing: 499999.999998
Planar Coordinate Information
Planar coordinate encoding method: coordinate pair
Coordinate representation:
Abscissa resolution: 0.000000026813284925708565
Ordinate resolution: 0.000000026813284925708565
Planar distance units: foot_us
Geodetic model
Horizontal datum name: D North American 1983
Ellipsoid name: GRS 1980
Semi-major axis: 6378137.0
Denominator of flattening ratio: 298.257222101
Spatial Domain
The geographic areal domain of the data that describes the western, eastern, northern, and southern geographic limits of data coverage.
Bounding Coordinates
In Unprojected coordinates (geographic)
West-73.692520 (longitude)
East-71.783287 (longitude)
North42.048842 (latitude)
South41.018290 (latitude)
+ Data Structure and Attribute Information
Summary of the information content of the data, including other references to complete descriptions of entity types, attributes, and attribute values for the data.
Direct spatial reference method: Vector
Attributes of 2020 Impaired Rivers
Detailed descriptions of entity type, attributes, and attribute values for the data.
Internal feature number.
Attribute values: Sequential unique whole numbers that are automatically generated.
Attribute definition source:
Feature geometry.
Attribute values: Coordinates defining the features.
Attribute definition source:
Waterbody ID
Waterbody  Name
Waterbody location
waterbody size
size unit
HUC 8 watershed name
Class Name
Waterbody Name
Stormwater Polluntant of Concern
Impaired Designated Use
Existing TMDL?
Link to TMDL
EPA Impairment Category
Type of Impairment
SDTS Feature Description
Description of point and vector spatial objects in the data using the Spatial Data Transfer Standards (SDTS) terminology.
Spatial data transfer standard (SDTS) terms
Feature class
Type: String
Count: 328
+ Metadata Reference
Metadata Date
Dates associated with creating, updating and reviewing the metadata.
Last updated: 20200130
Metadata Point of Contact
Contact information for the individual or organization responsible for the metadata information.
Person: University of Connecticut, Center for Land Use Education and Research
Phone: 860-345-4511
Email: clear@uconn.edu
Address type: mailing
City: Haddam
State or Province: CT
Postal code: 06438
Metadata Standards
Description of the metadata standard used to document the data and reference to any additional extended profiles to the standard used by the metadata producer.
Standard name: FGDC Content Standard for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention: local time
FGDC Plus Metadata Stylesheet
Stylesheet: FGDC Plus Stylesheet
File name: FGDC Plus.xsl
Version: 2.3
Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It displays metadata elements defined in the Content Standard for Digital Geospatial Metadata (CSDGM) - aka FGDC Standard, the ESRI Profile of CSDGM, the Biological Data Profile of CSDGM, and the Shoreline Data Profile of CSDGM. CSDGM is the US Federal Metadata standard. The Federal Geographic Data Committee originally adopted the CSDGM in 1994 and revised it in 1998. According to Executive Order 12096 all Federal agencies are ordered to use this standard to document geospatial data created as of January, 1995. The standard is often referred to as the FGDC Metadata Standard and has been implemented beyond the federal level with State and local governments adopting the metadata standard as well. The Biological Data Profile broadens the application of the CSDGM so that it is more easily applied to biological data that are not explicitly geographic (laboratory results, field notes, specimen collections, research reports) but can be associated with a geographic location. Includes taxonomical vocabulary. The Shoreline Data Profile addresses variability in the definition and mapping of shorelines by providing a standardized set of terms and data elements required to support metadata for shoreline and coastal data sets. The FGDC Plus Stylesheet includes the Dublin Core Metadata Element Set. It supports W3C DOM compatible browsers such as IE7, IE6, Netscape 7, and Mozilla Firefox. It is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or technical support.
Instructions: On the top of the page, click on the title of the dataset to toggle opening and closing of all metadata content sections or click section links listed horizontally below the title to open individual sections. Click on a section name (e.g. Description) to open and close section content. Within a section, click on a item name (Status, Key Words, etc.) to open and close individual content items. By default, the Citation information within the Description section is always open for display.
Download: FGDC Plus Stylesheet is available from the ArcScripts downloads at www.esri.com.