A flood is an overflow of water that submerges land. There are three types of floods:
1) Slow onset flood - occur along flood-plains or inland rivers. They are caused by heavy rain and run-off upstream ad the water can take days and even weeks to affect farms or towns downstream.
2) Rapid onset flood - occur in mountain areas of larger inland rivers or rivers flowing to the coast. Water flows rapidly and are more damaging.
3) Flash floods - occur during heavy rainfall of short duration. This type of flooding causes the greatest risk of property damage and loos of life as it can occur so quickly.
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