CMOT and redwelly - I agree, it is about managing the versus the weather in a much better way than in the past. Where I live, the river is at the bottom of town along a fairly narrow swath of land, where there are water meadows and channels for water mills. But from thereon up, there's a lot of up, so over a large area of land there's a heck of lot of rain that goes down the roads at quite a rate. Keeping the stormwater drains freely running is quite a headache.
There's a lot of chalk around this area, which does help in absorbing rainfall, so we're quite lucky in that respect. It's much more a problem for people on clay soils.
redwelly - Much as I appreciated the video of the canal bursting its banks, because that does show the effect of the rainfall, I did think that those people standing so close were being numpties.