Combined Sewer Outfall Sewer Shed

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MS4 Sewer Shed

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MS4 Storm Sewer Outfalls

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Storm Drain Marker Installations

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Locations of Combined Sewer Overflow Outfalls - US EPA Region 3

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This data layer identifies the locations of Combined sewer overflow outfalls. Combined sewer systems are sewers that are designed to collect rainwater runoff, domestic sewage, and industrial wastewater in the same pipe. Most of the time, combined sewer systems transport all of their wastewater to a sewage treatment plant, where it is treated and then discharged to a water body. During periods of heavy rainfall or snowmelt, however, the wastewater volume in a combined sewer system can exceed the capacity of the sewer system or treatment plant. For this reason, combined sewer systems are designed to overflow occasionally and discharge excess untreated wastewater directly to nearby streams, rivers, or other water bodies. For further information visit: http://cfpub1.epa.gov/npdes/home.cfm?program_id=5

Locations of Combined Sewer Overflow Outfalls - US EPA Region 3

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This data layer identifies the locations of Combined sewer overflow outfalls. Combined sewer systems are sewers that are designed to collect rainwater runoff, domestic sewage, and industrial wastewater in the same pipe. Most of the time, combined sewer systems transport all of their wastewater to a sewage treatment plant, where it is treated and then discharged to a water body. During periods of heavy rainfall or snowmelt, however, the wastewater volume in a combined sewer system can exceed the capacity of the sewer system or treatment plant. For this reason, combined sewer systems are designed to overflow occasionally and discharge excess untreated wastewater directly to nearby streams, rivers, or other water bodies. For further information visit: http://cfpub1.epa.gov/npdes/home.cfm?program_id=5

DC Watersheds

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Direct Discharge Areas

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DWSD CSO Event Data

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Detroit Water & Sewerage waste water discharge event location data (2008-2014). Information on location and function of various structures involved with discharging effluent collected by the Detroit Water & Sewerage Department. Combined sewer overflow (CSO) discharge event data from 2008-2014 (2014 data are recorded through June) is available (data are to be interpreted in millions of gallons).

MS4 Sewer Shed Single Polygon

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Retired September 28, 2023. District MS4 Sewershed drainage areas. The dataset contains locations and attributes of the drainage areas of MS4 outfalls created as part of the DC Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies. A database provided by WASA identified outfalls, drainage structures, and MS4 outfall locations. All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters.