ELI5- How does only 17″ of rain cause multiple feet of floodwater?

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My little girl is 7 and just isn’t wrapping her head around this and I need to find a better way to explain this.

She is so so smart because she saw the coverage of Helene, and heard 17″ and hot confused.

I told her the water runs from the high places to the low places, but then she asked why the water doesn’t leave the low places and why is it still flooded.

I’m bad at dumbing things down.

In: Planetary Science

17 Answers

Anonymous 0 Comments

The water is running down faster from hills than it can run out into the ocean.

Think of if you had a bathtop, and you opens the plus and opensed the tap, everything would be in balance if there is only one tap open, as the water would run out the drain at mostly the same speed. Now imagine that you had 10 taps, and you opened them all, and the water coming in would now be 10 times as much, but the drain would only take some of it out and the bathop would slowly fill.

Same with the hillsides, there are so many more hill sides than there are river outlets to the ocean

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