page_title: Sewerage
section_title: Components and types
hierarchical_section_title: Sewerage / Components and types
caption_attribution_description: English: Map of Seattle sewer districts from Appendix to 1894 annual report of Reginald H. Thomson, City Engineer. Map 839, Seattle Municipal Archives.
context_page_description: Sewerage is the infrastructure that conveys sewage or surface runoff using sewers. It encompasses components such as receiving drains, manholes, pumping stations, storm overflows, and screening chambers of the combined sewer or sanitary sewer. Sewerage ends at the entry to a sewage treatment plant or at the point of discharge into the environment. It is the system of pipes, chambers, manholes, etc. that conveys the sewage or storm water.
  In American colloquial English, "sewer system" is applied more frequently to the large infrastructure of sewers that British speakers more often refer to as "sewerage".
context_section_description: The main part of such a system is made up of large pipes (i.e. the sewers, or "sanitary sewers") that convey the sewage from the point of production to the point of treatment or discharge.
  Types of sanitary sewer systems that all usually are gravity sewers include:
  Combined sewer
  Simplified sewerage
  Storm drain
  Sanitary sewers not relying solely on gravity include:
  Vacuum sewer
  Effluent sewer
caption: Map of Seattle sewer districts, 1894
exif: {"Image Orientation": "Horizontal (normal)", "Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS Windows", "Image DateTime": "2009:07:29 14:29:33", "Image ExifOffset": "164", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "302", "Thumbnail JPEGInterchangeFormatLength": "6184", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "7783", "EXIF ExifImageLength": "8311"}