The 'Tainter gate' (radial gate) on a dam spillway has the advantage that:
Choose the correct answer
Tainter gate has larger gate area than vertical gate
Water pressure resultant passes through trunnion pivot → zero net moment → small hoist force needed (very efficient for large heads)
It does not require any maintenance
Only works in closed position, cannot be opened partially
Correct Answer
B. Water pressure resultant passes through trunnion pivot → zero net moment → small hoist force needed (very efficient for large heads)
Why is this the answer?
Tainter gate: curved skin plate on radial arm pivoted at trunnion (fixed point on pier). Advantage: hydraulic reaction from water pressure passes through trunnion → no net moment → very small hoisting force needed. Contrast: vertical lift gate must lift against full water pressure. Large sizes: 20×15 m common. Used on: spillway crests, navigation locks, canal head regulators. Seal: rubber seals at sides and sill. Self-regulating variant: Fuseplug.
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