GATE 2025 ES – Question 17

Water Resources and Environmental Hydraulics · Environmental Hydraulics · 1 mark · Multiple choice

For gradually varied flow, P states $y_n>y_c>y$ in an M3 profile; Q states $y_n<y_c<y$ in an S1 profile. Here $y_n,y_c,y$ are normal, critical and actual depths. Choose the truth values.

P true;Q true
P true;Q false
P false;Q true
P false;Q false

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Show answer and explanation

Correct answer: (A) P true;Q true

Explanation

A mild slope has $y_n>y_c$,and zone 3 lies below both depths: $y<y_c<y_n$. A steep slope has $y_n<y_c$,and zone 1 lies above both: $y>y_c>y_n$. Both stated inequalities follow these profile definitions. Thus **A**.

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