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CT305B ASSESSED LAKE 2018

Frequently-asked questions:


What does this data set describe?

Title:
CT305B ASSESSED LAKE 2018

Abstract:
Connecticut 305b Assessed Lake 2018 is a 1:24,000-scale, polygon feature-based layer that includes lakes that have been assessed in compliance with Sections 305(b) and 303(d) of the federal Clean Water Act.  Section 305(b) of the Clean Water Act requires each state to monitor, assess and report on the quality of its waters relative to attainment of designated uses established by the State's water quality standards.  Section 303(d) requires each State to compile a subset of that list identifying only those waters not meeting water quality standards and assign a Total Maximum Daily Load (TMDL) priority ranking to each impaired waterbody.  

This layer is based on information collected and compiled prior to 2018.  It represents conditions at a particular point in time and does not represent current conditions.  This layer includes only assessed lakes.  It can be used with the 2018 Connecticut 305b Assessed River layer and the Connecticut 305b Assessed Estuary layer to geographically display attainment and non-attainment for each designated use on assessed waters within Connecticut's boundaries. 

Features are polygon locations that represent the locations of assessed lakes.   The sources for these features include the hydrography layer and the water quality classification layer.  Attribute information is comprised of the Connecticut lake identification number, a unique identifier for each feature, the name of the waterbody, its location, the assessment cycle (year), the water type, the water quality class goal, the length of the feature in miles, the National Hydrography Dataset basin number, and the assessment for the following categories:  aquatic life, recreation, fish consumption, and drinking water supply.    Data is compiled at 1:24,000 scale. This dataset is not updated.

Supplemental information:
For additional information, refer to the Water Quality Standards for the State of Connecticut at http://www.ct.gov/dep/lib/dep/water/water_quality_standards/wqs.pdf.

  1. How should this data set be cited?

    State of Connecticut, Department of Energy and Environmental Protection (data compiler, editor and publisher), 2018, CT305B ASSESSED LAKE 2018: State of Connecticut, Department of Energy and Environmental Protection, Hartford, Connecticut, USA.

    Online links:
    Other citation details:
    The State of Connecticut, Department of Energy and Environmental Protection is the collector of the data (compiler), the creator and maintainer of the data layer (editor), and producer (publisher) of this information for use. Data compiled at 1:24,000 scale. This layer includes information that is applicable to a set time period (2018) and is not updated or changed in any way.

  2. What geographic area does the data set cover?

    Bounding coordinates:
    West: -73.655607
    East: -71.770182
    North: 42.066062
    South: 41.083469

  3. Does the data set describe conditions during a particular time period?

    Calendar date: prior to 2018
    Currentness reference:
    ground condition

  4. What is the general form of this data set?

    Geospatial data presentation form: vector digital data

  5. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (182)

    2. What coordinate system is used to represent geographic features?

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Lambert Conformal Conic
      Standard parallel: 41.200000
      Standard parallel: 41.866667
      Longitude of central meridian: -72.750000
      Latitude of projection origin: 40.833333
      False easting: 999999.999996
      False northing: 499999.999998

      Planar coordinates are encoded using coordinate pair.
      Abscissae (x-coordinates) are specified to the nearest 0.000000.
      Ordinates (y-coordinates) are specified to the nearest 0.000000.
      Planar coordinates are specified in survey feet.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical coordinate system definition:
      Altitude system definition:
      Altitude resolution: 1.000000
      Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

  6. How does the data set describe geographic features?

    CT305B ASSESSED LAKE 2018
    Connecticut 305b Assessed Lakes represented as polygon features. (Source: State of Connecticut, Department of Energy and Environmental Protection)

    OBJECTID
    Internal feature number. (Source: ESRI)
                      

    Sequential unique whole numbers that are automatically generated.

    ID305B
    Assigned unique identification. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Unique identification string.

    ACRES
    Size in acres of feature. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Calculated number.

    CT_LAKE_ID
    A unique identification number for each lake in Connecticut. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Unique positive whole number assigned to each lake.

    CYCLE
    Reporting year. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Value Definition
    2018
    Reporting date.

    LOCATION
    Detailed description of feature location. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Detailed textual description of location of feature.

    NHD_BASIN
    Identification number of National Hydrography Dataset basin. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Assigned number of basin in text format.

    WATER_QUALITY_CLASSIFICATION__5
    Water quality classication (Source: Connecticut Department of Energy and Environmental Protection)
                      

    WATER_NAME
    Name (Source: Connecticut Department of Energy and Environmental Protection)
                      

    AQUATIC_LIFE
    Assessment of feature in terms of the viability of aquatic life. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Value Definition
    Fully Supporting
    Aquatic life is fully supported for this feature.
    Not Assessed
    Aquatic life viability is not assessed for this feature.
    Not Supporting
    Aquatic life viability is not supported for this feature.

    RECREATION
    Assessment of feature in terms of recreation use. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Value Definition
    Fully Supporting
    Recreation use is fully supported for this feature.
    Not Assessed
    Recreation use is not assessed for this feature.
    Not Supporting
    Recreation use is not supported for this feature.

    FISH_CONSUMPTION
    Assessment of feature in terms of fish consumption. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Value Definition
    Fully Supporting
    Fish consumption use is fully supported for this feature.
    Not Assessed
    Feature not assessed.
    Not Supporting
    Fish consumption is not supported for this feature.

    DRINKING_WATER_SUPPLY
    Assessment of feature in terms of drinking water supply. (Source: Connecticut Department of Energy and Environmental Protection)
                      

    Value Definition
    Fully Supporting
    Drinking water supply use is fully supported for this feature.
    Not Assessed
    Drinking water supply use has not been assessed for this feature.
    Water Not Classified For Drinking Supply
    Drinking Water Supply use is not classified for this feature.
    Potential Supply, Not Assessed For Drinking Water
    Feature not assessed for drinking water.

    CLASS_ID
    CLASS_NAME
    USE_COUNT
    SHAPE
    Feature geometry. (Source: ESRI)
                      

    Coordinates defining the features.

    SHAPE.area
    SHAPE.len
    Entity and attribute overview:
    Includes assessed river features to include the Connecticut lake identification number, area in acres, the reporting year (assessment year), unique 305b identification number, name and location of feature, water quality class goal, type of waterbody, NHD basin, and categories assessed:  aquatic life viability, recreation, fish consumption, and drinking water supply.  Use the ID305B field to uniquely identify features.  The Name attribute decodes ID305B.  Use either the Name attribute or the ID305B attribute to label features on a map. To define a layer that only includes a certain assessment of a feature type, query the features for a specific attribute (e.g. Recreation) equal to a specific value (e.g. Not Supporting).  This will display only those features where the Recreation use is Not Supporting.
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Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)


  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Walter Tokarz
    State of Connecticut, Department of Energy and Environmental Protection
    79 Elm Street
    Hartford, Connecticut 06106-5127
    USA

    860-424-3020 (voice)
    deep.webmaster@ct.gov
    Hours of Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
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Why was the data set created?

Connecticut 305(b) Assessed Lake 2018 is 1:24,000-scale data. It depicts assessed lakes throughout the state.  Use this layer to show the locations of lakes and their accompanying use assessment . This layer should be used with the other assessed waterbody layers:  Assessed Estuary and Assessed River.  To gain a historical perspective, use this layer with the other Assessed Waters layers.  

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.)

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How was the data set created?

  1. Where did the data come from?

    Source 1 - National Hydrography Dataset (source 1 of 2)

    United States Geological Survey (USGS), Unknown, National Hydrography Dataset: United States Geological Survey, .

    Type of source media: online
    Source scale denominator: 24000
    Source contribution:
    Some hydrographic features were copied from this dataset.

    Source 2 - Water Quality Classifications (source 2 of 2)

    State of Connecticut, Department of Energy and Environmental Protection (data compiler, editor and publisher), Unknown, Water Quality Classifications: State of Connecticut, Department of Energy and Environmental Protection, Hartford, Connecticut, USA.

    Online links:
    Type of source media: disc
    Source scale denominator: 24000
    Source contribution:
    Some feature attribute information originated from the water quality classification feature class created by the Department of Environmental Protection.

  2. What changes have been made?

    Date: 20111213 (change 1 of 3)
    Metadata imported.

    Data sources used in this process:
    • Y:\GIS_Warehouse\Public_Data\Metadata\Document\ct305b_assessed_lake_2016_load.xml

    Metadata imported.

    Data sources used in this process:
    • \\tsclient\Y\Workspaces\GIS_Projects\Data\2016_305b_assessed_waters\depgis_DEP_CT305b_ASSESSED_Lake_2016_usgs.xml

    Metadata imported.

    Data sources used in this process:
    • \\tsclient\P\ct305b_assessed_lake_2012.xml

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How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

  5. How consistent are the relationships among the observations, including topology?

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How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access constraints: None. No restrictions or legal prerequisites for accessing the data. The data is in the public domain and may be redistributed.
Use constraints:
None. No restrictions or legal prerequisites for using the data after access is granted. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet). Although this data set  has been used by the State of Connecticut, Department of Energy and Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Energy and Environmental Protection as to the accuracy of the data and or related materials.  The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Energy and Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Energy and Environmental Protection as the source for this information. For example, include the following data source description when printing this layer on a map: Lake Assessment - From the Connecticut 305b Assessed Lake 2018, layer, compiled and published by CT DEEP.  Source map scale is 1:24,000.

This data is accurate in the time period specified for data collection dates.  Refer to the "State of Connecticut Integrated Water Quality Report" at 
http://www.ct.gov/dep/lib/dep/water/water_quality_management/305b/2016_iwqr_final.pdf for more information about collection dates.

Distributor 1 of 1

  1. Who distributes the data set?

    State of Connecticut, Department of Energy and Environmental Protection
    79 Elm Street
    Hartford, Connecticut 06106-5127
    USA

    860-424-3540 (voice)
    860-424-4058 (FAX)
    deep.gisdata@ct.gov
    Hours of Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

  2. What's the catalog number I need to order this data set?

    Connecticut 305B Assessed Lake 2018

  3. What legal disclaimers am I supposed to read?

    Although this data set  has been used by the State of Connecticut, Department of Energy and Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Energy and Environmental Protection as to the accuracy of the data and or related materials.  The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Energy and Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata.

  4. How can I download or order the data?

    • Availability in digital form:


    • Data format:
      in format Shapefile, Feature Class (version ArcGIS)
      Network links: http://www.ct.gov/deep

    • Cost to order the data: An online copy of the data may be accessed without charge.


  5. Is there some other way to get the data?

    The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.

  6. What hardware or software do I need in order to use the data set?

    Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.

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Who wrote the metadata?

Dates:
Last modified: 20150423

Metadata author:
Walter Tokarz
State of Connecticut, Department of Energy and Environmental Protection
79 Elm Street
Hartford, Connecticut 06106-5127
USA

860-424-3020 (voice)
deep.gisdata@ct.gov
Hours of Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata(FGDC-STD-001-1998)

Metadata extensions used:
  • http://www.esri.com/metadata/esriprof80.html
  • http://www.esri.com/metadata/esriprof80.html
  • http://www.esri.com/metadata/esriprof80.html

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