Drainage System Components and Sub-Systems

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What is the purpose of the drainage system in a building?

To regulate the water pressure in the building

To convey sewage, rainwater, or other wastes from their point of origin to a point of disposal (correct)

To distribute clean water throughout the building

To provide ventilation for the building

What is the primary function of a trap in the drainage system?

To regulate the water pressure in the drainage pipes

To filter out solid waste from the drainage system

To collect and store rainwater for later use

To prevent the backflow of obnoxious gases into the building (correct)

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. (correct)

A soil pipe is used to carry rainwater, while a waste water pipe is used to carry sewage.

A soil pipe is made of a different material than a waste water pipe.

There is no difference between a soil pipe and a waste water pipe.

What is the purpose of the vent system in the drainage system?

To prevent the backflow of obnoxious gases into the building Signup and view all the answers

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 Signup and view all the answers

What is the purpose of the sewer in the drainage system?

To carry off soil liquids for treatment at sewage works Signup and view all the answers

What is the primary purpose of a manhole in a drainage system?

To allow access for maintenance and inspection Signup and view all the answers

What is the recommended minimum width for the access shaft of a manhole?

55 mm Signup and view all the answers

What is the purpose of the 'benching' in a manhole?

To direct overflowing sewage back into the channels Signup and view all the answers

What is the recommended slope for the top of the benching in a manhole?

1:12 Signup and view all the answers

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 Signup and view all the answers

What is the purpose of the ball test described in the text?

To detect blockages in the drainage pipes Signup and view all the answers

What is the primary purpose of properly ventilating the entire building drainage system?

To prevent the buildup of foul gases Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

What is the purpose of laying lateral sewers at a proper gradient?

To develop a self-cleaning velocity and prevent the buildup of debris Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

Drainage System Components and Sub-Systems

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