In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,
A. Is only provided
B. Is doubled
C. Is trebled
D. Is not enough
Answer: Option B
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d/D = 1/2( 1-cos $/2).
Use this to find angle $.
Then find r/R = 1 - (360 sin $/2π $).
Then equate RS = rs.
We get s = 2S.