What is a 'strainer' in river paddling, and why is it one of the most dangerous hazards?
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A
A shallow section of river where rocks scrape the bottom of the hull
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B
An obstacle (such as a fallen tree) that allows water to pass through but traps boats and people, creating a drowning risk
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C
A narrow canyon section with fast, constricted current
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D
A series of closely spaced standing waves