What are the reason for flood?

Answer 1

Most floods in some parts of the world are caused by rapid spring snow melt or storms that bring heavy rains over a large region. Rising sea levels from global warming are also causing flooding in low lying coastal areas.

More precipitation (rain, snow) than runoff results in local flooding. Agricultural and forestry practices can greatly affect the capacity of land to hold water. Cutting all the trees in an area will cause "unnatural" water levels below and on the ground.

In regions such as Australia where melting snow does not cause floods, they can be caused by excessive rainfall resulting from severe storms (a common cause of flash floods), cyclones that degenerate into depressions, or seasonal monsoons. These may dump large amounts of rain in river catchments, and slowly, these floods continue for thousands of kilometres through Australia's complex river systems. Because inland Australia is so flat, these "slow onset" floods can be hundreds of kilometres wide across the flat land.

In low-lying areas of Asia, flooding is caused by high tides and storm surges associated with wild weather. The flooding in these areas is intensified because large numbers of people live along the coast and rely on the oceans for their livelihood. When storm surges, tidal waves and even minor tsunamis occur, it swamps tens of thousands of homes and farms.

Different places have their own reasons of flooding. The major source of flooding includes human factors and natural causes.

Natural causes

Lack of lacks to regulate the river flow is one of the factors. Lakes act like a large water tank to store up excess water. Silting in river channels make the river beds shallower and storage capacity will be reduced. When there's heavy rain, the river may not able to store up all the water and flooding will occur. Heavy and continuous rain and typhoon are also the causes. Typhoon can push sea water on to the coastal areas and creates storm surge. Countries which are influenced by monsoon winds receive large amount of rainfall in summer, also the snow melt water from the surrounding mountains will go downward as well.

Human factors

People cut trees for developing makes the land surface lose the protection of vegetation and less vegetation are left to absorb the rainwater. Then silting will be more serious and rainwater is washed into the rivers more quickly. Wrong farming methods and overgrazing also speed up loss of soil. Some farmers reclaim along the shore of rivers will reduce the capacity of rivers.

Answer 2

Flooding can be caused by heavy rainfall, melting snow, dam or levee failures, or storm surges from hurricanes or tsunamis. Factors like urbanization, deforestation, and climate change can also exacerbate flooding by altering natural drainage patterns. Poorly designed infrastructure and inadequate flood control measures can contribute to the severity of flooding.

Answer 3

A flood is made by loads of rain which is non-stop. The drains are blocked and the rivers burst (they overflow with that much rain!) It destroys all of the houses in the floods area and could kill the locals of the area. Overall floods are just terrible. To stop a flood put sandbags in front of the door.

Answer 4

Floods are caused by heavy rains that pour to much in rivers or waterways.

Answer 5

High rainfall or smowmelting can cause seriousflooding.

Answer 6

Flood is caused by many things:

1. Heavy rain

2. Bursting pipes

3. Ice bergs from the oceans melt and come on land

4. Sewage blocked