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Waste Water Engineering - Engineering

Q1:

For the open drain (N = 0.025) shown in the below figure, the discharge is

A 26.88 cumecs

B 27.88 cumecs

C 28.88 cumecs

D 29.88 cumecs.

ANS:C - 28.88 cumecs

Area = 7.2 sqr-m.

Perimeter= 7.252 m.
Hydr. R = 0.99 say 1.

Assume the slope of 1 in 100.

V = 1/0.025 x (1) ^ 2/3 x (1/100)^ 1/2.
V = 4 m/sec.
Q = A x V.
Q = 7.2 Sqr-m * 4 m/sec,
Q= 28.8 cumec.