Water Bridge

Check out this bridge.


It took 6 years and 500 million euros to build! At 918 meters long, this is the largest water bridge. It was built over the Elbe River in Magdeburg, Germany.

I found a neat trivia question about the bridge: Did that bridge have to be designed to withstand the additional weight of ship and barge traffic, or just the weight of the water?

Answer:
It only needs to be designed to withstand the weight of the water! Why? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loaded. Neat, huh?

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One Response to “Water Bridge”

  1. James Says:

    To answer both questions: The weight of the bridge does not increase because any displaced water will flow off of the bridge and thus keeping the weight the same, as CJ said in his comment (This is like having a bathtub full to the brim with water and placing a 10 pound boat in. 10 pounds of water will overflow out of the tub, keeping the overall weight the same). Also, if you have a full glass of water with ice cubes and they melt, the level of the water will stay exactly the same. This is because the volume of the melted ice is equal to the volume of the water displaced by the ice cube. I am right, try it yourself and see.

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