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There is a wikipedia article on the Boscastle Flood of 2004. This was a flash flood event, caused by simultaneous water discharge from several catchments, though land clearances and engineering works no doubt played their part as well.

One rainguage recorded 3.5 inches of rain within one hour, but many others in the region showed less than 0.5 inches.

Like most flash floods, debris dams formed, and upon their breeching, a flash flood followed downstream.

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10y ago
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Q: How much rain fell in 15 minutes in boscastle?
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