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The minimum thickness of the side wall of the manhole is __________

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The minimum thickness of the side wall of the manhole is __________

(a) 50mm

(b) 100mm

(c) 225mm

(d) 300mm

I have been asked this question by my college professor while I was bunking the class.

My doubt is from Devices Associated with Sewer in chapter Construction of Sewers, Sewer Appurtenances and Sewage Pumping of Environmental Engineering

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The correct choice is (c) 225mm

To elaborate: The minimum thickness of the side wall of the manhole is 225mm and they are commonly made of bricks.

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