A triangular open channel has a vertex angle to 90° and

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A triangular open channel has a vertex angle to 90° and carries flow at a critical depth of 0.30 m. The discharge in the channel is

1. 0.08 m³ /s
2. 0.11 m³ /s
3. 0.15 m³ /s
4. 0.2 m³ /s

Correct Option: B

At flow at critical depth, Q is maximum.

	Q²	=	A³
	g	=	T

Q = √(A³ .g) / T

A =	1	× 2y × y = y²
	2

T = 2y

≈ 0.1 m³ / s.