Civil Engineering MCQAE Level Civil Engineering
In a mild slope (M) channel, when the depth is greater than normal depth (y > y_n > y_c), the water surface profile is classified as:
Fluid MechanicsOpen Channel ProfileMEDIUM
Choose the correct answer
A
M2 (drawdown curve)
B
M1 (backwater curve)
C
M3
D
S1
Correct Answer
B. M1 (backwater curve)
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M1 profile: y > y_n > y_c (mild slope, subcritical flow, depth above normal depth). The depth increases in the downstream direction (backwater curve). M2: y_c < y < y_n (drawdown). M3: y < y_c < y_n.
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