The 'water surface profile' M2 in mild slope channel is a:
Choose the correct answer
Backwater curve (water backed up behind dam)
Drawdown curve where depth is between critical and normal depth — approaches critical at a free overfall on mild slope
Horizontal water surface (So=0)
Adverse slope profile
Correct Answer
B. Drawdown curve where depth is between critical and normal depth — approaches critical at a free overfall on mild slope
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GVF profiles (mild slope, M profiles, y_c < y_n): M1: y > y_n (backwater, behind dam); M2: y_c < y < y_n (drawdown, water depth between critical and normal — occurs at free overfall on mild slope approaching brink); M3: y < y_c (below critical, supercritical on mild slope). M2 is drawdown curve, approaches critical at free overfall.
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