18 Questions
What is the purpose of the drainage system in a building?
To convey sewage, rainwater, or other wastes from their point of origin to a point of disposal
What is the primary function of a trap in the drainage system?
To prevent the backflow of obnoxious gases into the building
What is the difference between a soil pipe and a waste water pipe?
A soil pipe carries wastewater from WCs, while a waste water pipe carries water discharged from baths, sinks, and washbasins.
What is the purpose of the vent system in the drainage system?
To prevent the backflow of obnoxious gases into the building
What is the role of the site datum in the drainage system?
To provide a reference point for measuring the depth of the drainage pipes
What is the purpose of the sewer in the drainage system?
To carry off soil liquids for treatment at sewage works
What is the primary purpose of a manhole in a drainage system?
To allow access for maintenance and inspection
What is the recommended minimum width for the access shaft of a manhole?
55 mm
What is the purpose of the 'benching' in a manhole?
To direct overflowing sewage back into the channels
What is the recommended slope for the top of the benching in a manhole?
1:12
Which of the following is NOT a recommended principle for laying drainage pipes?
Connecting the house drain to the public sewer regardless of the level difference
What is the purpose of the ball test described in the text?
To detect blockages in the drainage pipes
What is the primary purpose of properly ventilating the entire building drainage system?
To prevent the buildup of foul gases
What is the primary function of the intercepting trap in the house drain?
To prevent foul gases from the public sewer from entering the house drain
What is the importance of the joints in the sewer system being water-tight and properly tested?
To prevent water leakage and potential damage to the building structure
What is the purpose of laying lateral sewers at a proper gradient?
To develop a self-cleaning velocity and prevent the buildup of debris
What is the recommended material for sewer pipes, and why is it important?
Non-absorbent, to comply with standard requirements and protect them from external loads
What is the recommended approach for dealing with the rain water from houses?
Allow the rain water to flow freely on the road surface and convey it to the storm water drain
Explore the components and sub-systems of a drainage system, including the soil drainage system, waste drainage system, storm drainage system, and vent system. Learn about how these systems work together to safely dispose of sewage, rainwater, and other wastes.
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