If you live on a flood plain = You're going to get flooded
Exactly the same argument can be made about noise and living near an airport. Doesn't mean to say that steps can't and shouldn't be made to mitigate the effects.
We live in the flood plain of the River Mole that runs along the bottom of our garden - we have lived here for over 35 years and the house has never been flooded although the garden has been totally waterlogged on a number of occasions.
We have noticed over the last few years that the water level has risen, often just for a short period, following heavy rain far more than it used to - we have put this down to two main causes - the river no longer seems to be cleared of debris by the River Authority, as it used to be, added to which there have been thousands of houses, (part of the Surrey Plan), built on the flood plain on the other side of the river. These houses are protected by 'flood defenses' but of course this means the amount of land that can be flooded has been reduced making it far worse for the remaining land.
In my opinion flood defenses, (i.e. barriers and water diversion) are not the answer and ultimately it has to come down to making sure that the natural water courses and drainage channels are kept as clear as possible to allow the water to drain out to the sea.
The bottom of the garden a few weeks ago - you can just see the roofs of the new houses in the background.
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My ghast is utterly flabbered!