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The main cause is usually heavy rainfall and locations at risk range from desert regions where watercourses are normally dry through to more temperate zones, particularly in mountainous regions.
With sufficient advance warning it may also be possible to reduce the extent of flooding; for example, by raising temporary flood defences, clearing watercourses of debris, reducing reservoir levels, and operating flood control gates and barriers.
These include the benefits of flood defence operations, community-based options (e.g. temporary defences, pumping), watercourse maintenance (e.g. removing blockages, clearing debris screens), search and rescue, evacuation, contents moved or evacuated, contingent flood proofing (e.g. flood boards installed following a flood warning) and deployment of business continuity plans.
Flash floods on rivers, streams and other watercourses are a common occurrence in many countries.
� Flood response - local authorities and others taking precautionary measures, such as clearing debris from watercourses with a known flood risk and pre- positioning staff and equipment closer to areas potentially at risk
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