Global Risk Data Platform
Floods are one of the most frequent natural hazards and occur in almost every country. A flood is generally defined as an excess of the amount of discharged water compared to the drainage capacity. At present there is no systematic global detection of flood events as there is for cyclones and earthquakes.
Floods are triggered by various phenomena and there are different types of floods. For example one often differentiates among flash floods, river floods, and urban floods, all of which are caused by a combination of heavy precipitation and poor drainage. The severity of these flood types depends on rainfall intensity, spatial distribution of rainfall, topography and surface conditions.