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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. 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Layers for each year represent proportional coverage of 14 Chesapeake Bay 2013 1-meter Land Use Data classes, interpolated (1985-2013) based on evolution of land-cover derived from NLCD 1992, 2001, 2006, and 2011 layers, and projected (2014-2025) using land use estimated for 2025 using the USGS Chesapeake Bay Land Change model (USGS, 2020). \nBest management practices (BMPs) are not included in this data release. BMPs have varying effects on nutrient inputs and runoff. These effects are best represented in CAST. Moreover, the BMP history is regularly revised by the states and the most current history is available as a downloadable file from CAST. \nChesapeake Bay Program, 2020. Chesapeake Assessment and Scenario Tool (CAST) Version 2019. 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Layers for each year represent proportional coverage of 14 Chesapeake Bay 2013 1-meter Land Use Data classes, interpolated (1985-2013) based on evolution of land-cover derived from NLCD 1992, 2001, 2006, and 2011 layers, and projected (2014-2025) using land use estimated for 2025 using the USGS Chesapeake Bay Land Change model (USGS, 2020). \nBest management practices (BMPs) are not included in this data release. BMPs have varying effects on nutrient inputs and runoff. These effects are best represented in CAST. Moreover, the BMP history is regularly revised by the states and the most current history is available as a downloadable file from CAST. \nChesapeake Bay Program, 2020. Chesapeake Assessment and Scenario Tool (CAST) Version 2019. 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Goddard, X. Wang, and M. Hopton. Development of a scenario-based stormwater management planning support system for reducing combined sewer overflows (CSOs).   JOURNAL OF ENVIRONMENTAL MANAGEMENT. 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Goddard, X. Wang, and M. Hopton. Development of a scenario-based stormwater management planning support system for reducing combined sewer overflows (CSOs).   JOURNAL OF ENVIRONMENTAL MANAGEMENT. 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Areas are broken down by NPDES Outfall Number.\u00a0 The data source is DWW.cso_basin_plgn_pv. The layer continues to be updated as new information about the CSO system becomes available and as modifications to the system are completed. The boundaries in this layer were created and updated for purposes of developing a hydrologic and hydraulic computer model. The model was used to estimate CSO control volumes and develop CSO control alternatives. Estimation of control volume and alternative analysis did not require a parcel level of detail, so it is expected that the boundary is not always correct at the parcel level. In addition, the CSO basin boundary shapefile reflects both the sewer basin AND the drainage basin tributary to the overflow point, and these two basins do not always line up cleanly. 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Areas are broken down by NPDES Outfall Number.\u00a0 The data source is DWW.cso_basin_plgn_pv. The layer continues to be updated as new information about the CSO system becomes available and as modifications to the system are completed. The boundaries in this layer were created and updated for purposes of developing a hydrologic and hydraulic computer model. The model was used to estimate CSO control volumes and develop CSO control alternatives. Estimation of control volume and alternative analysis did not require a parcel level of detail, so it is expected that the boundary is not always correct at the parcel level. In addition, the CSO basin boundary shapefile reflects both the sewer basin AND the drainage basin tributary to the overflow point, and these two basins do not always line up cleanly. 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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.</SPAN></P></DIV></DIV></DIV>","distribution":[{"@type":"dcat:Distribution","accessURL":"https://maps2.dcgis.dc.gov/dcgis/rest/services/DCGIS_DATA/Environment_Stormwater_Management_WebMercator/MapServer/19","format":"ArcGIS GeoServices REST API","mediaType":"application/json","title":"ArcGIS GeoService"},{"@type":"dcat:Distribution","accessURL":"https://maps2.dcgis.dc.gov/dcgis/services/DCGIS_DATA/Environment_Stormwater_Management_WebMercator/MapServer/WMSServer?request=GetCapabilities&service=WMS","format":"OGC WMS","mediaType":"application/vnd.ogc.wms_xml","title":"OGC WMS"},{"@type":"dcat:Distribution","accessURL":"https://opendata.dc.gov/api/download/v1/items/d17165adac694dce9cc2469cea415dac/csv?layers=19","format":"CSV","mediaType":"text/csv","title":"CSV"},{"@type":"dcat:Distribution","accessURL":"https://opendata.dc.gov/api/download/v1/items/d17165adac694dce9cc2469cea415dac/geojson?layers=19","format":"GeoJSON","mediaType":"application/vnd.geo+json","title":"GeoJSON"},{"@type":"dcat:Distribution","accessURL":"https://opendata.dc.gov/api/download/v1/items/d17165adac694dce9cc2469cea415dac/kml?layers=19","format":"KML","mediaType":"application/vnd.google-earth.kml+xml","title":"KML"},{"@type":"dcat:Distribution","accessURL":"https://opendata.dc.gov/api/download/v1/items/d17165adac694dce9cc2469cea415dac/shapefile?layers=19","format":"ZIP","mediaType":"application/zip","title":"Shapefile"},{"@type":"dcat:Distribution","accessURL":"https://opendata.dc.gov/datasets/DCGIS::storm-sewer-system","format":"Web Page","mediaType":"text/html","title":"ArcGIS Hub Dataset"}],"identifier":"https://www.arcgis.com/home/item.html?id=d17165adac694dce9cc2469cea415dac&sublayer=19","issued":"2015-02-27T20:55:44.000Z","keyword":["DC Water","DOEE","dc","district of columbia","emergency","rain","storm sewer system","washington dc","water"],"landingPage":"https://opendata.dc.gov/datasets/DCGIS::storm-sewer-system","license":"https://creativecommons.org/licenses/by/4.0","modified":"2026-02-06T00:00:00.000Z","publisher":{"name":"Department of Energy and Environment"},"spatial":"-77.0814,38.8568,-76.9712,38.9815","theme":["geospatial"],"title":"Storm Sewer System"},"description":"<DIV STYLE=\"text-align:Left;\"><DIV><DIV><P><SPAN>DC Water operates a wastewater collection system comprised of \"separate\" and \"combined\" sewers. 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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. 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