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Have you ever seen a river over a river?

Even after you see it, it is still hard to believe!Water Bridge in Germany. What a feat!Six years, 500 million Euros, 918 meters long . . . now this is engineering!This is a channel-bridge over the River Elbe and joins the former East and West Germany ,As part of the unification project. It is located in the city of Magdeburg , near Berlin .The photo was taken on the day of inauguration . To those who appreciate engineering projects, here's a puzzle for your armchair engineers. . . and physicists. 
Question: 
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. 
More . . . .
The Elbe-Havel and Mittelland canals had previously met near Magdeburg but on opposite sides of the Elbe. Ships moving between the two had to make a 12-kilometer detour, descending from the Mittelland Canal through the Rothensee boat lift into the Elbe, then sailing downstream on the river, before entering the Elbe-Havel Canal through Niegripp lock. Low water levels in the Elbe often prevented fully laden canal barges from making this crossing, requiring time-consuming off-loading of cargo. 

Construction of the water link was started as early as in the 1930s but due to the World War 2 and subsequent division of Germany the work remained suspended till 1997. The aqueduct was finally completed and opened to the public in 2003.

 
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