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Layer: Combined Sewer System Area (CSS) (31)

Name: Combined Sewer System Area (CSS)

Display Field: Name

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Description: DC Water operates a wastewater collection system comprised of "separate" and "combined" sewers. Approximately two-thirds of the District is served by a separate sewer system, while the remaining one-third is served by combined sewers. A combined sewer system conveys both sanitary sewage and storm water in one piping system. The District's combined sewer system was developed before 1900. Separate systems are comprised of two independent piping systems: one system for "sanitary" sewage (i.e., sewage from homes and businesses) and one system for storm water. During normal, dry weather conditions: Sanitary wastes collected in the combined sewer system are diverted to Blue Plains at facilities called regulators or dams. Typically, there are no overflows to the District's rivers and creeks. During periods of rainfall, the capacity of a combined sewer may be exceeded. When this occurs, regulators are designed to let the excess flow, which is a mixture of stormwater and sanitary wastes, be discharged directly into the District's rivers and creeks. This excess flow is called combined sewer overflow or CSO. Release of this excess flow is necessary to prevent flooding in homes, basements, businesses, and streets. CSO's are discharged to the Anacostia River, Rock Creek, Potomac River or tributary waters at CSO outfalls during most moderate rain events.

Copyright Text: Department of Energy and Environment

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Layer: DOEE Best Management Practices (42)

Name: DOEE Best Management Practices

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Description: Best Management Practices (BMPs) are structural controls used to manage stormwater runoff. Examples include green roofs, rain gardens, and cisterns. BMPs reduce the effects of stormwater pollution and help restore the District’s waterbodies. The District’s stormwater regulations require that large construction or renovation projects install BMPs to manage stormwater runoff once construction is complete.

Copyright Text:

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Layer: Impervious Surface - 2010 (15)

Name: Impervious Surface - 2010

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Description: The dataset contains basemap features that are typically classified as impervious surface, captured in 2010. Some examples of Impervious Surfaces include: Airport Taxiways, Helipads, Outdoor Building Stairs, Buildings, Sidewalks, Roads, Alleys, Driveways, and Swimming Pools.

Copyright Text: Office of the Chief Technology Officer

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Layer: Impervious Surface - 2013 (40)

Name: Impervious Surface - 2013

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Description: The dataset contains basemap features that are typically classified as impervious surface, captured in 2013. Some examples of Impervious Surfaces include: Airport Taxiways, Helipads, Outdoor Building Stairs, Buildings, Sidewalks, Roads, Alleys, Driveways, and Swimming Pools.

Copyright Text: Office of the Chief of Technology Officer

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Layer: Impervious Surface - 2015 (46)

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Copyright Text: Office of the Chief of Technology Officer

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Layer: Impervious Surface - 2017 (50)

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Copyright Text: Office of the Chief of Technology Officer

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Layer: Impervious Surface - 2019 (78)

Name: Impervious Surface - 2019

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Copyright Text: Office of the Chief of Technology Officer

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Layer: Impervious Surface - 2021 (72)

Name: Impervious Surface - 2021

Display Field: DESCRIPTION

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Description: The dataset contains basemap features that are typically classified as impervious surface, captured in 2021. Some examples of Impervious Surfaces include: Airport Taxiways, Helipads, Outdoor Building Stairs, Buildings, Sidewalks, Roads, Alleys, Driveways, and Swimming Pools.

Copyright Text: Office of the Chief of Technology Officer

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Layer: Impervious Surface - 2023 (73)

Name: Impervious Surface - 2023

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Description: The dataset contains basemap features that are typically classified as impervious surface, captured in 2023. Some examples of Impervious Surfaces include: Airport Taxiways, Helipads, Buildings, Sidewalks, Roads, Alleys and Swimming Pools.

Copyright Text: Office of the Chief of Technology Officer

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Layer: Municipal Separate Storm Sewer (MS4) Outfalls (68)

Name: Municipal Separate Storm Sewer (MS4) Outfalls

Display Field: LAND_USE

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Description: The dataset contains locations and attributes of the MS4 Storm Sewer outfalls created as part of the District MS4 Permit. GPS outfall locations were captured in 2004-2006 by, then, DC WASA. A database provided by WASA identified outfalls, drainage structures, and MS4 outfall locations. The data was later verified in conjunction between DOEE and DCWater along with field verification. Updates occur as needed. This data is used for planning and modeling purposes by various District programs. This data is a requirement of the District's MS4 Permit.Outfall ID Identification:0-1999 - Originally provided outfall IDs2000-2999 – Outfalls discovered from GIS and map analysis and later field verified3000-3999 – Outfalls discovered during field work but with no additional info available4000-4999 – Outfalls that can not be found in the field or cannot be verified

Copyright Text: Department of Energy and Environment

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Layer: Municipal Separate Storm Sewer (MS4) Sewershed (30)

Name: Municipal Separate Storm Sewer (MS4) Sewershed

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Description: This layer depicts a generalized boundary of the District’s Municipal Separate Storm Sewer System (MS4) drainage areas. Each sewershed shows the general drainage area of a system of pipes and structures that carries only stormwater runoff that empty into natural or manmade surface waterways. This data is a requirement of the District's MS4 Permit. It is used for stormwater management and all aspects supporting efforts to comply with the Clean Water Act in the District. The dataset contains locations and attributes of the drainage areas of MS4 outfalls.

Copyright Text: Department of Energy and Environment

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Layer: Storm Drains - DOEE (47)

Name: Storm Drains - DOEE

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Description: Storm Drain Marker Installations is a data layer showing where storm drain markers were installed on storm sewer catchments. Markers indicate that the sewer catchments drain to the Chesapeake Bay watershed and to report pollution to DC's 311 service line. Markers are installed by DOEE and volunteer groups. This dataset should not be considered as a complete capture of all DC storm drains. There are some storm drains that are knowingly not included within this layer. Catchbasin ID refers to DC Water's ID for each storm drain.

Copyright Text: Department of Energy and Environment

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Layer: Combined Sewer (CSS) Sewershed (19)

Name: Combined Sewer (CSS) Sewershed

Display Field: NAME

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Description: DC Water operates a wastewater collection system comprised of "separate" and "combined" sewers. Approximately two-thirds of the District is served by a separate sewer system, while the remaining one-third is served by combined sewers. A combined sewer system conveys both sanitary sewage and storm water in one piping system. The District's combined sewer system was developed before 1900. Separate systems are comprised of two independent piping systems: one system for "sanitary" sewage (i.e., sewage from homes and businesses) and one system for storm water. During normal, dry weather conditions: Sanitary wastes collected in the combined sewer system are diverted to Blue Plains at facilities called regulators or dams. Typically, there are no overflows to the District's rivers and creeks. During periods of rainfall, the capacity of a combined sewer may be exceeded. When this occurs, regulators are designed to let the excess flow, which is a mixture of stormwater and sanitary wastes, be discharged directly into the District's rivers and creeks. This excess flow is called combined sewer overflow or CSO. Release of this excess flow is necessary to prevent flooding in homes, basements, businesses, and streets. CSO's are discharged to the Anacostia River, Rock Creek, Potomac River, or tributary waters at CSO outfalls during most moderate rain events.

Copyright Text: Department of Energy and Environment

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• Value: CSO 032
  Label: CSO
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• Value: CSO 034
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• Value: CSO 035
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• Value: CSO 036
  Label: CSO
  Description: N/A
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• Value: CSO 037
  Label: CSO
  Description: N/A
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• Value: CSO 038
  Label: CSO
  Description: N/A
  Symbol:
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• Value: CSO 039
  Label: CSO
  Description: N/A
  Symbol:
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  Color: [115, 178, 255, 255]
  Outline:
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• Value: CSO 040
  Label: CSO
  Description: N/A
  Symbol:
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  Color: [115, 178, 255, 255]
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• Value: CSO 041
  Label: CSO
  Description: N/A
  Symbol:
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• Value: CSO 042
  Label: CSO
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  Symbol:
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• Value: CSO 043
  Label: CSO
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• Value: CSO 044
  Label: CSO
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  Symbol:
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• Value: CSO 045
  Label: CSO
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• Value: CSO 046
  Label: CSO
  Description: N/A
  Symbol:
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  Color: [115, 178, 255, 255]
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• Value: CSO 047
  Label: CSO
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  Symbol:
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• Value: CSO 048
  Label: CSO
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• Value: CSO 049
  Label: CSO
  Description: N/A
  Symbol:
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• Value: CSO 050
  Label: CSO
  Description: N/A
  Symbol:
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• Value: CSO 051
  Label: CSO
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  Symbol:
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• Value: CSO 052
  Label: CSO
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  Symbol:
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  Color: [115, 178, 255, 255]
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• Value: CSO 053
  Label: CSO
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  Symbol:
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• Value: CSO 057
  Label: CSO
  Description: N/A
  Symbol:
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• Value: CSO 058
  Label: CSO
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  Symbol:
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  Color: [115, 178, 255, 255]
  Outline:
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  Width: 0
Transparency: 0
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Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: true
Supports Sql Format: false
Supports Query Analytic: true
Supports Query With Current User: true


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HasM: false

Has Attachments: false

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