Similar near me, some developers decided to build a new estate on what had always been flood plain nicely situated along the river bank and some councillors decided it was a good idea. Everyone was totally shocked when it flooded a few years later. I bet they never bought any of the houses.
There was an area near us (Moreton Shore for those that know The Wirral)
there is a big concrete embankment and a wide grassed area behind it
then a road - which is raised a bit - and then what was some scrub land behind that - which was scrud land because when it rained the wate rhad nowhere to go as it was below sea level for half the day
SO they build a housing estate on it
My Dad knew a bloke who bought one of them - we mentioned all this and he made sure his house was on a slightly higher bit
To my knowledge it has never flooded
but I reckon it is only a matter of time
OK - that was probably up to 40 years ago - but I tend to want my house to last a fair bit longer than that!!!