Plumber Red Seal · Question
In a drainage pipe, when fast-moving, shallow flow suddenly becomes slow-moving and deeper, often at a decrease in pipe grade, what is this phenomenon called?
A hydraulic jump is a fluid mechanics phenomenon that occurs when supercritical flow (fast, shallow) transitions to subcritical flow (slow, deep). In drainage,
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Question: In a drainage pipe, when fast-moving, shallow flow suddenly becomes slow-moving and deeper, often at a decrease in pipe grade, what is this phenomenon called?
Answer options:
- Laminar flow
- Turbulent flow
- Hydraulic gradient ✅ Hydraulic jump
Correct answer: Hydraulic jump
Explanation: A hydraulic jump is a fluid mechanics phenomenon that occurs when supercritical flow (fast, shallow) transitions to subcritical flow (slow, deep). In drainage, this can cause a sudden rise in the water level, potentially leading to blockages or backups if not accounted for in the design.
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