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Question
Sewers of 450 mm diameter are designed to run at ____ of sewer pipe at ultimate peak designed flow.
A.
1/2 depth
B.
2/3 depth
C.
3/4 depth
D.
4/5 depth
Answer ( Option B)

2/3 depth

Solution

Dia of sewer                          Design depth
1. < 400 mm                          1/2 depth of sewer pipe
2. 400 – 900 mm                 2/3 depth of sewer pipe
3. > 900 mm                         3/4 depth of sewer pipe

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