Question

List the impacts and causes of flood .

Answer 1

people seeking refuge from flood in Jawa Tengah, Java. ca. 1865–1876.


Contemporary picture of the flood that struck the North Sea coast of Germany and Denmark in October 1634.

Answer 2

A flood is an overflow of water that submerges land that is usually dry.
Causes of floods
Flooding occurs most commonly from heavy rainfall when natural watercourses do not have the capacity to convey excess water. However, floods are not always caused by heavy rainfall. They can result from other phenomena, particularly in coastal areas where inundation can be caused by a storm surge associated with a tropical cyclone, a tsunami or a high tide coinciding with higher than normal river levels. Dam failure, triggered for example by an earthquake, will result in flooding of the downstream area, even in dry weather conditions.
Other factors which may contribute to flooding include:
volume, spatial distribution, intensity and duration of rainfall over a catchment;
the capacity of the watercourse or stream network to convey runoff;
catchment and weather conditions prior to a rainfall event;
ground cover;
topography; and
tidal influences.