Connecticut Sewer Service Area is 1:24,000-scale, polygon feature-based data that depict sanitary waste water sewer service areas in Connecticut. Most if not all homes and businesses located within a sewer service area discharge sanitary waste water into the local sewer system. Service areas are delineated along streets and around structures and built-up areas shown on the USGS topographic quadrangle maps and orthophotos where sewer pipes were present on the more detailed sewer system maps. The sewer service area boundaries are approximate and may not encompass all areas and establishments currently discharging into the local sewer system. Depicts the areal extent of wastewater sewer systems in existence at the time DEP last updated this information. Data is compiled at a map scale of 1:24,000 (1 inch =2,000 ft). Attribute information includes a code that distinguishes between existing and proposed areas of sewer service. Information was last updated in 1998, with a minor update to New London and Waterford sewer service areas in May, 2006.
Connecticut Sewer Service Area is 1:24,000-scale data that locates areas where sewer service is provided or proposed for construction at the time DEP last updated this information. Use this information for planning purposes only. Not intended for maps printed at map scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet.)
This information was initially compiled in 1987 by the Natural Resources Center, Connecticut Department of Environmental Protection. Sewer service areas were mapped at 1:24,000-scale on 7½ Minute U.S. Geological Survey topographic quadrangle maps and later digitized. In 1997 and 1998, the Bureau of Water Management, Department of Environmental Protections updated the digital sewer service area data and included some proposed sewer service areas. A minor update to New London and Waterford sewer service areas was performed in May, 2006.
publication date
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 Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of 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 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 Environmental Protection as the source for this information. For example, include the following data source description when printing this layer on a map: Sewer Service - From the Connecticut Sewer Service Area layer, compiled and published by CT DEP. Source map scale is 1:24,000.
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The Connecticut Sewer Service Areas data outlines the street network, residential, commercial and industrially developed areas where most homes and businesses are presumed to discharge sanitary wastewater to the local sewer system. CT DEP delineated these areas by interpreting sewer system maps available from municpal governments and sewer authorities operating sanitary wastewater treatment plants. All attributes have valid values. Values are within defined domains. The accuracy test for the AV_LEGEND attribute values was conducted by visually comparing the original information published on the more detailed sewer system maps with 1:24,000-scale check plots and interactive computer displays of the areas delineated as sewer service areas by CT DEP.
Polygon features conform to the following topological rules. Polygons are single part. There are no duplicate polygons. Polygons do not self overlap. Polygons do not overlap other polygons. Establishment of logical consistency was performed by the State of Connecticut, Department of Environmental Protection using ESRI ArcGIS software to manually create and control feature topology in Shapefile and later in GeoDatabase feature format. No automated procedures or tests were performed to guarantee desired topology other than visual inspection.
The completeness of the data reflects the feature content of the data sources available at the time of compilation and update by DEP. These data sources include sewer system maps largely provided by municaplities operating sanitary wastewater treatment plants that are on file at DEP.
The horizontal positional accuracy of this data is unknown.
Includes various sewer system infrastructure maps maintained by municpal governments and sewer authorities that show the locations of sewer pipes, connections, mains, pumps, treatment facilities, etc. These maps are published at various map scales and publication dates.
Sewer Service Areas compiled by CT DEP on 1:24,000-scale 7.5 minute USGS quadrangle area Mylar overlays.
This original version of the Connecticut Sewer Service Area data is in ArcInfo Coverage format with polygon feature topology. The name of the original coverage is SEWERSRV.
The Connecticut Sewer Service Area in ArcInfo Coverage format was converted to ESRI Shapefile and then to GeoDatabase polygon feature format and named SEWER_SERVICE_AREA.
Create 1:24,000-scale Sewer Service Area Mylars - The original Sewer Service Area data in ArcInfo Coverage format was based on information mapped and subsequently digitized from a series of 1:24,000-scale Mylar overlays maintained by the State of Connecticut, Department of Environmental Protection (DEP). The following briefly describes a mapping effort to delineate service area boundaries statewide. Mylar overlays for each 1:24,000-scale, 7.5 minute topographic quadrangle map were made by placing a blank sheet of 2 millimeter Mylar on each topographic quadrangle map and manually drafting the neat lines (boundaries) of the topographic quadrangle map on the Mylar. The neat lines were drafted in India ink and are the basis for manually registering (lining up) the overlay to the corresponding topographic quadrangle map. At the time, these overlays were not prepared with the intent of creating a manuscript appropriate for digitizing. Rather, they were meant to be used with and the basis for manually delineating other 1:50,000 and 1:125,000 small-scale Mylar overlays for regional and statewide assessments of areas in Connecticut where sewer service is provided. Due to their 2-millimeter thickness, these Mylars are susceptible to expansion and contraction under varying humidity conditions. They are not a stable base. Also, the neat lines drawn on the overlays registered each overlay to the paper topographic quadrangle map and not a stable-base Mylar of the topographic quadrangle map. Stable-base Mylar is the preferred media when tablet digitizing. Maps of individual sewer systems across Connecticut were obtained from municipalities and regional sewer authorities. These maps often included the locations of sewer pipes, connections, mains, pumps, treatment facilities, etc. They were published at various map scales and publication dates. CT DEP staff interpretted information on these maps and manually delineated sewer service boundaries on the corresponding quadrangle scale Mylar overlays. Service areas were delineated along streets and around structures and built-up areas shown on the USGS topographic quadrangle map where sewer pipes were present on the more detailed sewer system maps provided by the municipalities. The names of the sewer systems and locations of sewage treatment plants were also mapped on these Mylar overlays.
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Create 1:24,000-scale Connecticut Sewer Service Area (initial coverage) - feature digitizing and attribution (digitizing tablet) method. Using ESRI ArcInfo software, sewer service polygon features were digitized by registering the source map to the digitizing tablet and using the crosshairs of the digitizer's mouse to manually capture the geometry (location) of features drafted on the map. The corners of the USGS 7.5 minute topographic quadrangle maps used as registration points and are depicted on the compilation sheets (Mylar overlays). Each compilation sheet was registered to the digitizing tablet by digitizing (entering) the locations of four quadrangle corner registration points shown on the map. ArcInfo software compared the values of the digitized coordinates with the actual (true) values for the quadrangle corner (tic) features. The Root Mean Square (RMS) error generated by the ArcInfo software indicated the amount of error involved in transforming coordinates from the registered map to the digital layer. RMS errors higher than 0.004 were not acceptable and required re-registering the source map by digitizing the tic locations again. With a correct registration, individual features were manually digitized off the source map and assigned values to distinguish (polygon) areas were sewer service is and is not provided. Where necessary, additional minor corrections (edits) to feature geometry were manually digitized on the screen (heads-up digitizing) at display scales greater than 1:24,000. Feature location and attribute accuracy was visually checked and inspected by symbolizing and labeling features according to attribute value on the computer screen and on hard copy paper maps, and comparing this information to the original information that were digitized. These check plot maps were printed at the same scale as the compilation sheets in order to visually inspect digitizing quality. The ends of service areas along quadrangle boundaries were drawn to line up with the corresponding sewer service boundaries on adjacent quadrangles. Sewer service boundary lines were first digitized as line features, creating an ArcInfo coverage for each USGS topographic quadrangle map area. Line features on adjacent quadrangle ArcInfo coverages were edgematched so that they would snap together and form enclosed polygon features when all quadrangle coverages were appended. Using the ArcInfo Append command, the line feature based quadrangle coverages were appended to form a statewide coverage. Polygon feature topology was then created using the ArcInfo build command, and the resulting polygon features were manually attributed to identify sewer service polygon features verses those polgyon areas that are not sewered.
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Update the 1:24,000-scale Connecticut Sewer Service Area - feature digitizing and attribution (heads up digitizing) method. Using ESRI ArcGIS software, features appearing on the more up to date sewer system maps from varous municipalities were manually digitized on the screen (heads-up digitizing) at display scales greater than 1:24,000 using either USGS 7.5 minute topographic quadrangle maps, orthophotography, or a street network displayed in the background for reference. In some instances, section of the street network were buffered to create new sewer service area polygon features. Sewer service area boundary and attribute accuracy was visually checked and inspected by symbolizing and labeling features according to attribute value on the computer screen and comparing this with information on the original sewer system map. Starting in 1998, these procedures are followed to update the sewer service area information, as needed. Information is irregularly updated. Minor update was made to New London and Waterford sewer service areas in May, 2006.
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Internal feature number.
ESRI
ArcView Legend - A text field that differentiates existing and proposed sewer service areas. Use this field to symbololize the Sewer Service area polygon features on a map.
State of Connecticut, Department of Environmental Protection
Areas were sewer service is provided.
State of Connecticut, Department of Environmental Protection
Areas were sewer service is proposed.
State of Connecticut, Department of Environmental Protection
Feature geometry.
ESRI
Features are polygon locations that represent the approximate location of areas served by sewer systems. Includes an attribute, AV_LEGEND, used to differentiate existing and proposed sewer service areas. Use this field to symbololize the Sewer Service area polygon features on a map.
not applicable
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Although this data set has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of 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 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.
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.
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