If you are unlucky enough to have been unaware that you purchased a property on a flood plain I can offer you a bit of advice, move.
If you are unable to do, so then I recommend forming a local community pressure group to ensure the risk of flooding is kept to a minimum, speaking as one person is unlikely to make as much of an impact as a group of active locals who also bother to use there right to vote on these issues.

best of luck

http://www.ham-residents-group.org.uk

If your home is at risk of groundwater flooding, you will usually get some notice of the rising levels. For instance, a cellar floor might start to have damp patches which gradually join together and then become puddles which coalesce into a...

We flooded here in Pentre, Shropshire in 1998 and 2000. We live on a flood plain and we are fortunate in the sense that we do not suffer flash floods but have fair warning of an imminent flood. We also do not suffer sewage in our homes. We should,...

Make sure your neighbour has an emergency contact number for you. You may be at work when the flood happens – if they’re at home, then at least they can either keep you informed if it’s just looking like a flood is imminent, or if it all happens...