Which type of gate is generally used for low navigation dams?
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A.
Bear trap gate
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B.
Vertical lift gate
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C.
Rolling gate
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D.
Drum gate
Correct Answer:
A. Bear trap gate
Explanation:
The bear trap gate is the most common choice for low navigation dams. This type of gate is composed of two steel leaves—one hinged upstream and the other downstream—that overlap over the dam crest. They are particularly effective for low-head navigation because they can be lowered completely to allow vessels, ice, or debris to pass over the crest. Unlike other gate types, they feature a wide base that does not require a deep recess in the dam structure and can be designed for automatic operation using water pressure to raise or lower the leaves.
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