Which particular type of fall incorporates a parabolic glacis to dissipate energy ?
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Answer: C. Montague type fall
Explanation
The Montague type fall utilizes a specially designed parabolic glacis profile to dissipate energy smoothly. The parabolic shape prevents hydraulic jumps from forming violently and minimizes turbulence damage. Energy dissipation is achieved efficiently through smooth velocity transitions along the curved glacis. Canal drops require energy dissipation structures to prevent scouring of downstream unlined channels. Glacis falls feature sloping floors that guide high velocity water into a hydraulic jump basin. Parabolic profiles optimize pressure distribution and reduce cavitation risks on concrete surfaces.
Irrigation engineers select specific fall designs based on discharge rates and economic considerations. Effective energy dissipation protects expensive canal drop structures from severe structural erosion. Proper hydraulic design ensures safe transition of water back to normal uniform flow velocities. Option a uses a vertical drop rather than a sloping parabolic glacis for energy dissipation. Option b describes standard glacis falls with straight slopes rather than parabolic profiles. Option d refers to Inglis falls, which use different baffle configurations for energy dissipation.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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