Section 4: Soil and Water Conservation Engineering
Fluid Mechanics
Subtopic: Flow through orifices, weirs and notches
Question Statement:
In an experimental setup, the discharge through a triangular notch is 0.0074 m³ s⁻¹ at an operating head of 0.1 m. The coefficient of discharge for the notch is 0.7. If the required discharge is 0.1 m³ s⁻¹, the corresponding width of water surface in m is
Options:
(A) 0.80
(B) 0.099
(C) 0.00043
(D) 0.00086
Official Answer Key:
A
Step-by-Step Solution & Explanation
For a triangular (V) notch, the width of the water surface at head h is W = 2h·tan(θ/2).
Using h = 0.283 m (from Q.54) and tan(θ/2) = 1.415 (from Q.54): W = 2×0.283×1.415 = 0.80 m. Answer: (A).
Section 5 — Irrigation and Drainage Engineering
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