Question

Write about the major cause of floods.

Answer 1

Heavy Rainfall at River Sources

Unusually heavy weather at the source of a river can lead to vast amounts of water draining into the water table. The water table of a river is the area from which it gathers water, so if an unnaturally high level of water is draining into this area, this will lead to similarly high levels of water in the river. As more and more of the river’s tributary streams join the river, this effect is amplified until the amount of water reaches a critical level; the banks – or the natural flood plain – cannot hold such a volume and it spills over. This often occurs at lower reaches of a river in areas of habitation, causing extensive damage.

Snow Melt

Sudden thaws in mountainous areas can lead to dangerous increases in water draining into the water table. A dramatic temperature increase after a particularly cold winter causes the ice and snow on mountaintops to melt and drain into valley rivers. This effect can cause similar damage as heavy rainfall.

Irresponsible Damming

Flooding is not always caused by natural occurrences; human intervention in natural river courses can have a huge effect on the likelihood of flooding. For example, landowners further up the stretch of a river erecting illegal dams to protect their farmland can have catastrophic effects farther down the river when this unalleviated pressure is brought to bear on people’s homes in more densely populated areas. In 2008, "Time" magazine ran an article which pointed the finger at the Army Corps of Engineers' incompetent damming policy increasing water pressure on the Mississippi, stating, "500-year floods seem to be hitting the Mississippi every 15 years."

hope it helps you friend

Answer 2

There are different types of natural hazards weed causes a lot of destruction and the floods are one of the most dangerous natural hazards which are caused for different purposes,such as;

1) Excessive amount of rainfall.

2) Tsunami is also a major reason in the critical coastal areas.

3) High amount of tides in the rivers which cause floods in the river bank regions.

4) The water overflow from the dams is also a major reason.

And many more.