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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.
The vents of the Redoutable are under the casing. The square openings in the casing are limber holes to facilitate draining the superstructure. In submarine technology a vent is a valve fitted to the top of a submarine's ballast tanks to let air escape from the top of the ballast tank and be replaced by water entering through the opening(s) called "flood ports" or "floods" at the bottom of the ...
The 1540 drought in Europe was a climatic event in Europe. In various palaeoclimatic analyses the temperature and precipitation regimes were reconstructed and compared to present-day conditions. On the basis of historical records Wetter et al. (2014) [ 1 ] derived that during an eleven-month period there was little rain in Europe , possibly ...