On the occasion when our old house flooded a bit, it did surprise us. It had rained heavily overnight, but it had stopped. Of course rivers are still rising and catchments filling with water from higher ground even after the rain stops.
It also transpired (although they still deny it) that British Waterways (now the Canal and River Trust) had released a great deal of water from their system, much of which ended up in the watercourse across the road from the house.
I doubt very much that we would get a warning if it happened again anyway. It's a local issue.
On the other hand, when the Somerset levels flood it would presumably be possible to give some hours' notice. There are a lot of remote sensors measuring levels and flow rates.
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