Rubbish! It has to be deeper all the way to its exit and that isn't likely to be possible in the UK. If you don't do it all the way down it just makes the water arrive downstream at a faster rate and causes a bigger flood there.
They could dredge the flood planes so they can flood easier and store more water, that would work for a bit. They did that a couple of miles away from me but its never flooded into the storage area in living memory (i.e. since it was done ~30 years ago).
That's why you do it all the way down.
How very true on all three points.
I believe that was the flood which was impressive for its extensive media coverage and high level political attention it received despite the relatively small number of flooded properties involved.
Unless you were one of the affected people in which case the high profile was entirely 100% appropriate, of course. :-)
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