GEOLOGY

Detailed explanation-1: -A flood can develop in a many ways. The most common is when rivers or streams overflow their banks. These floods are called riverine floods. Heavy rain, a broken dam or levee, rapid icemelt in the mountains, or even a beaver dam in a vulnerable spot can overwhelm a river and send it spreading over nearby land.

Detailed explanation-2: -Floods are often caused by heavy rainfall, rapid snowmelt or a storm surge from a tropical cyclone or tsunami in coastal areas. Floods can cause widespread devastation, resulting in loss of life and damages to personal property and critical public health infrastructure.

Detailed explanation-3: -Flooding typically occurs when prolonged rain falls over several days, when intense rain falls over a short period of time, or when an ice or debris jam causes a river or stream to overflow onto the surrounding area. Flooding can also result from the failure of a water control structure, such as a levee or dam.

Detailed explanation-4: -Massive Rainfall. Drainage systems and the effective infrastructure design aid during heavy rains. Overflowing of the Rivers. Collapsed Dams. Snowmelt. Deforestation. Climate change. Emission of Greenhouse Gases. Other Factors.

Detailed explanation-5: -erosion of the river channel. buildup of sediment in the river channel. widening of the channel. destruction of natural levees.