❓ why
Why do some cities flood after short, intense rainstorms?
WeatherFlooding
Quick Answer
Urban surfaces like pavement do not absorb much water, so rainfall runs off quickly into drains and rivers. If the storm is intense enough or drainage is limited, water builds up fast.
The Full Story
In natural landscapes, soil and vegetation can soak up a significant fraction of rainfall. In cities, concrete, asphalt, and roofs create impervious surfaces that push water into storm drains almost immediately. If rain falls faster than the drainage system can handle, streets and subways can flood within minutes. This is one reason flash flooding is a major hazard in many dense urban areas.
Key Facts
1.Impervious surfaces increase runoff
2.Flash floods can develop within minutes to hours
3.Drainage capacity often determines whether streets flood
YouTube Angle
Suggested video title for this topic:
"Why can a 20-minute storm turn a city street into a river?"