Short answer: On the afternoon of 16 August 2004, around 75mm of rain fell in about two hours on the hills above Boscastle, and a flash flood of roughly two billion litres swept down the valley through the village. Around 50 cars were washed into the harbour and out to sea, buildings were wrecked, and dozens of people were airlifted to safety by rescue helicopters. Remarkably, nobody died.
On 16 August 2004, a summer afternoon, an intense storm stalled over the high ground above Boscastle. About 75mm of rain fell in around two hours, and the Valency and Jordan rivers, which meet in the village, rose with frightening speed. Roughly two billion litres of water poured down the valley and through the village.
The village was rebuilt, and new flood defences followed. Walking down the river from the Cobweb car park to the harbour, it's hard to picture the water that came through. The first Christmas tree in the harbour went up in the year of the flood, and the village has lit one most Decembers since.
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