Allied & ICAR Exam Bank • ALLIED_1180 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Gully Control and Drop Spillways

Subtopic: Weir Flow in Drop Spillway

Question Statement:

The crest of a rectangular drop spillway inlet weir has a length $L = 4.0\text{ m}$. If the head over the crest is $H = 0.64\text{ m}$ (so $H^{3/2} = (0.64)^{1.5} = 0.512$), and the discharge coefficient is $C = 1.77$, the discharge capacity $Q = C L H^{3/2}$ in m$^3$/s is:

Answer Key:

3.62

Step-by-Step Solution & Explanation

$Q = 1.77 \times 4.0 \times 0.512 = 7.08 \times 0.512 = 3.625\text{ m}^3/\text{s}$.
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