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Waste Water Engineering

Q1: If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is

A π

B

C

D

E

ANS:D -

The wetted perimeter of a sewer refers to the length of the portion of the sewer's inner surface that is in contact with the flowing water. For a circular sewer, the wetted perimeter P can be calculated using the formula: P=π×D Where:

  • π is the mathematical constant pi (approximately 3.14159)
  • D is the diameter of the sewer
Given:
  • Diameter of the sewer D=2 meters
We need to find the wetted perimeter when the depth of partial flow is 50 cm, which is 0.5 meters. Using the formula: P=π×2 P=2π Therefore, the wetted perimeter of the sewer is 2π.



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