Europe
Climate change
Katrina
Flood risk
Flood types
 
       
       
   
Quizzes
Games
Assignments
Virtual tour
 
       
FLOODsite Logo
Things to know
Things to do
Downloads
English Nederlands

Hazards

Waves on the coast of England, Hartlepool.
Waves on the coast of England, Hartlepool.
Source: Floodsite, HR Wallingford

Natural hazards for floods are:

  • severe storm
  • heavy rainfall
  • sudden melting of snow or ice

By abundant rainfall or large amounts of snow, the water in a river or reach more dangerous heights. Storms can make the sea surge and make the waves ride high. A flood hazard does not always cause a flood. Perhaps the storm does not reach the coast. Perhaps the dunes can defend the land against the water.

Man-made hazards are:

  • breach of a dam, dike or dune
  • failure of a sluice, lock, weir
  • listorm surge barriers not closing (or closing too late)

A man-made hazard will mostly lead to disaster only when it takes place under severe weather conditions. A sea lock that doesn’t close may not cause that much trouble at low tide, but it may at high tide or in a storm. A storm surge barrier that doesn’t close when it is tested on a sunny doesn’t cause problems, but if it doesn’t close in a severe storm surge it does.

Here you can see a presentation on natural hazards.

Back to flood risk