Question Bank • QB_EXP_SWCE_ENR_019 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Specific Energy, Critical Flow & Hydraulic Jump

Subtopic: Specific energy and critical flow

Question Statement:

Referring to the specific energy curve, what is the maximum upward bed step $\Delta z_{\text{max}}$ in meters that can be introduced in a rectangular channel with $E_1 = 1.50\text{ m}$ and $y_c = 0.60\text{ m}$ without causing choking of upstream flow? (round off to two decimal places)

Answer Key:

0.6

Step-by-Step Solution & Explanation

Choking is avoided if $E_2 \ge E_{\text{min}}$. For rectangular channel, $E_{\text{min}} = 1.5 y_c = 1.5 \times 0.60 = 0.90\text{ m}$. $\Delta z_{\text{max}} = E_1 - E_{\text{min}} = 1.50 - 0.90 = 0.60\text{ m}$.
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