Mar 10

Why is high-intensity rainfall likely to lead to flooding ?

  • Please help thanks in advance =]


  • In well populated areas that the water runs off all those roads, paths, paved areas and the roofs of houses straight into the storm drains. These can't cope with the sudden influx of all this water. They fill up and the water ends up flooding the populated areas.
    In the country, the ground just soaks up the rain and this more slowly drains off into the rivers. In exceptional circumstances, you get flash floods down these river valleys.
    It's the sheer volume of water in a short time that causes the problem.


  • Because a high-intensity rain falls faster than it soaks into the ground. That means it runs off, first in small rivulets, but those rivulets run into each other to form larger streams and, at last, floods.







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    Posted in portal.jdzjx.com by anonym @ March 10, 2010 | edit |