Rising Rivers are caused by heavy rain which can cause rivers to overflow their banks onto the floodplain (the flat section next to a river).
Flash floods are caused when heavy rain falls in a small area with little warning.
Coastal areas can flood because of unusually high tides, swells, or tsunami.
Urban areas can flood when the rain falls faster than the storm water system can manage, or when storm water drains become blocked. These floods usually happen quickly and can block roads and damage buildings.