Floods

what is floods ?

Flood is a form of natural disaster. It 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 such escapes of water endanger land areas used by man like a village, city or other inhabited area.Floods can also occur in rivers, when flow exceeds the capacity of the river channel, particularly at bends or meanders

Impacts of floods

As the other natural disaster, floods also impacts on the environment and society. Floods destroy drainage systems in cities, causing raw sewage to spill out into bodies of water. In the heavy flood, the house also can be destroy very easy. This can lead to catastrophic effects on the environment as many toxic materials such as paint, pesticide and gasoline can be released into the rivers, lakes, bays, and ocean, killing maritime life. Floods may also cause millions of dollars worth of damage to a city, both evicting people from their homes and ruining businesses. Floods cause significant amounts of erosion to coasts, leading to more frequent flooding if not repaired.

However, floods also have a slight positive impact on the environment.It spread sediment containing beneficial nutrients to topsoil that might never occur if do have floods.