prolonged rainfall and heavy rainfall are the main causes of flooding
1)it occurs when the discharge of the river is so high that the river spills over the banks into the floodplain.
2) a major cause of flooding is prolonged rainfall as after a long period of rain, the ground becomes saturated and so can't absorb anymore water (can't infiltrate). which causes surface runoff which increases discharge.
3)heavy rainfall can lead to rapid surface runoff if the rainfall is too intense for infiltration to occur. this can lead to a sharp rise in river discharge(flash flood)
4)melting snow and ice can lead to an increase in river discharge.
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