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The Ninja Turtles are Partying

Jessie Peña caught video of a manhole cover in Phoenix, Arizona, the other day. Someone else saw a definite opportunity for a beat. What, exactly, is going on down there?

(YouTube link)

The storm drain system normally has a lot of air in it. When the system suddenly carries a lot of water, as it has during intense downpours in Arizona lately, the water pushes the air against the covers. That’s a lot of pressure, because those covers are heavy! -via reddit

(Image manipulation performed at Make Me Googly)


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I live in hill country, and my house is near the river. When we get substantial rain, the storm drain covers in my neighborhood just gush up with water running down from three counties. The covers have holes in them, so the whole lid won't wash away.
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Are you sure it's not Ed Norton on his way home from work? Related question:
Why are manhole covers round? (hint: think applied geometry)
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