Floods can have a disastrous effect on society and the environment.
The average number of people killed by floods per year is around 6,700 and physical damage alone can cost countries millions.
The worst affected would be drainage/sewer systems which can completely collapse under the pressure of a flood, this could then lead to raw sewage or other toxic materials to spill out into large bodies of water which can then contaminate fields or other bodies of water. This leads to the eventual spread of water-borne diseases and the absence of any clean drinking water.
Not only do severe floods cause deaths they can also lead to thousands of people being forced out of their homes due to significant damages to houses.
Economic hardship can be a long term effect of bad flooding as rebuilding costs mount, tourism decreases and local businesses and farms are forced to close down.
Although crops and food supplies can suffer under the effects of flooding, there are some farmlands that greatly benefit from the nutrients that can be carried to the soil.