Commiserations to people affected by flooding.
Each time there is a flooding incident, this blog mentions the open-source plan for a low-cost, effective, high-volume, low-head pump ideally suited to shifting flood waters.
For any DIY enthusiasts, garden shed engineers and entrepreneurs out there, if you click here you can find out how to build a pump using an outboard motor and few intermediate technology skills.
I made one myself and tested it in the Congresbury Yeo. It worked very well.
Of course, the best thing to do is to make one now if you are in a potentially flood affected area.