A natural disaster is a major adverse event resulting from natural processes of the Earth; examples include floods, severe weather,volcanic eruptions, earthquakes, and other geologic processes. A natural disaster can cause loss of life or property damage, and typically leaves some economic damage in its wake, the severity of which depends on the affected population's resilience, or ability to recover.
An adverse event will not rise to the level of a disaster if it occurs in an area without vulnerable population. In a vulnerable area, however, such as San Francisco, an earthquake can have disastrous consequences and leave lasting damage, requiring years to repair
A flood is an overflow of an expanse of water that submerges land. The EU Floods directive defines a flood as a temporary covering by water of land not normally covered by water. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Flooding may result from the volume of water within a body of water, such as a river or lake, which overflows or breaks levees, with the result that some of the water escapes its usual boundaries. While the size of a lake or other body of water will vary with seasonal changes in precipitation and snow melt, it is not a significant flood unless the water covers land used by man like a village, city or other inhabited area, roads, expanses of farmland, etc.
Some of the most notable floods include:
• The Great Flood of 1993 was one of the most costly floods in United States history. • The 1998 Yangtze River Floods, in China, left 14 million people homeless. • The 2005 Mumbai floods which killed 1094 people.
• The 2010 Pakistan floods, damaged crops and infrastructure, claiming many lives. Tropical cyclones can result in extensive flooding and storm surge, as happened with:
• Bhola Cyclone, which struck East...