In the velocity-area method of stream gauging, the discharge is computed as:
Choose the correct answer
Q = average velocity x stream length
Q = sum of (partial area x mean velocity in that vertical), integrated across the stream width (mid-section or mean-section method)
Q = peak velocity x total area
Q = Manning V x cross-section area
Correct Answer
B. Q = sum of (partial area x mean velocity in that vertical), integrated across the stream width (mid-section or mean-section method)
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Velocity-area: divide stream width into verticals. Measure velocity at each vertical (using current meter at 0.6 depth or average of 0.2 and 0.8 depths). Q = sum of V_i x delta_A_i. Mid-section: delta_A = V_i x (w_(i-1)/2 + w_(i+1)/2) x d_i. More verticals = more accurate. Minimum 20 verticals for proper gauging.
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