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The underground drainage system of a building carries waste from the drainage pipes and streams to the public sewer main if the house is on sewer or a septic tank or black where the sewer is not available.

There are only two connections to the drain at the foot of the pipe down and swamp. There is no case based on a single stream or the bottom of the toilet pipe in a system with two pipes, the gorge is a trap that is included and what are the lines residues keys other than the bathroom in a two-pipe system. To access the sewer to clear blockages – it is miserable. These are in close connection to the soil stack, located in the plane at an angle of right turns on the side of the property and along the border correctly.

In most cases, these processes do not use rain water – wastewater treatment plants and sewage treatment would have been much greater if they did. In contrast, water from rain or in the channels and lines of rain – water or surface water run from a drive, for example – is a separate set of fact or wastewater into the public surface water sewer or a septic tank in the area of the house. A house, a septic tank, even if the error is connected to a main drainage channel.

Another drainage design is often used when a group of houses together. The individual house drains are connected to public sewerage.