❓ why
Why do some rivers overflow their banks during floods?
Quick Answer
Rivers flood when rainfall, snowmelt, or upstream runoff delivers more water than the channel can carry.
The Full Story
A river channel has a limited capacity, and once that is exceeded, water spreads onto the floodplain. Heavy storms, rapid snowmelt, saturated ground, and dam or levee failure can all increase flood risk. Straightened channels and urban development can make flooding worse by speeding water downstream. Floodplains are naturally built to be inundated from time to time. That is why many major cities on rivers have flood defenses.
Key Facts
1.Floods happen when discharge exceeds channel capacity
2.Floodplains are natural overflow areas
3.Urban surfaces increase runoff
YouTube Angle
Suggested video title for this topic:
"Why rivers escape their banks"
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