Gradually Varied Flow (GVF) profile M1 on a mild slope occurs when the depth is:
Choose the correct answer
y < yn (below normal depth)
y > yn > yc — depth greater than both normal and critical depths (backwater curve on mild slope)
y = yc (critical depth)
y < yc (supercritical)
Correct Answer
B. y > yn > yc — depth greater than both normal and critical depths (backwater curve on mild slope)
Why is this the answer?
For mild slope (M), M1 profile: y > yn > yc (actual depth > normal depth > critical depth). Flow is subcritical. dy/dx > 0 (depth increases in flow direction). Occurs upstream of a dam or weir on a mild slope — the backwater curve. Numerically integrated using Standard Step or Direct Step method.
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