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A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
For example, the invert of a street sewer connection could affect the feasibility of adding a toilet in the basement of a house. Conversely, the obvert level is the highest interior level, and can be considered the "ceiling" level, being the highest level of that sewer.
Pool drain vortex as viewed from above the water at Grange Park wading pool Underwater view of drain, showing vortex-formation phenomenon. A drain is the primary vessel or conduit for unwanted water or waste liquids to flow away, either to a more useful area, funnelled into a receptacle, or run into sewers or stormwater mains as waste discharge to be released or processed.
Passive locating uses signals that occur naturally on some utility lines. This method often fails to locate 60% or so of utility lines, [citation needed] and misidentifying utilities is an associated risk. Active locating, on the other hand, is more accurate.
Sanitary manholes should be constructed at locations where there is a change from a simple straight sewer line. These include all junctions that combine multiple lines into one or split from one, bends, changing in elevation, changing in pipe size, and changing in pipe type.
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A man clears a sanitary sewer pipe with a motorized snake. Plant roots and other material being removed from a drain. A plumber's snake or drain snake or drain auger is a slender, flexible auger used to dislodge clogs in plumbing.
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