GEOLOGY

Detailed explanation-1: -Floods are often caused by heavy rainfall, rapid snowmelt or a storm surge from a tropical cyclone or tsunami in coastal areas.

Detailed explanation-2: -Heavy rainfall is the main reason for occurrence of flood. Flooding occurs most commonly from heavy rainfall when natural watercourses do not have the capacity to convey excess water.

Detailed explanation-3: -Heavy rainfall. Deforestation. Improper drainage system.

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.