Prosciugare le cascate del Niagara

[jumpjack]

Impossibile ma già fatto! :eek:

E' successo 40 anni fa, per studiare come conservare il letto del fiume!
http://www.dailymail.co.uk/news/article-1338793/Niagara-Falls-ran-dry-Photos-moment-iconic-waterfall-came-standstilll.html

http://i.dailymail.co.uk/i/pix/2010/12/15/article-1338793-0C7E4026000005DC-82_634x433.jpg

http://i.dailymail.co.uk/i/pix/2010/12/15/article-1338793-0C7DB7DE000005DC-707_634x417.jpg

To achieve this the army had to build a 600ft dam across the Niagara River, which meant that 60,000 gallons of water that flowed ever second was diverted over the larger Horseshoe Falls which flow entirely on the Canadian side of the border.

The dam itself consisted of 27,800 tons of rock, and on June 12, 1969, after flowing continuously for over 12,000 years, the American Falls stopped.


Read more: http://www.dailymail.co.uk/news/article-1338793/Niagara-Falls-ran-dry-Photos-moment-iconic-waterfall-came-standstilll.html#ixzz18Mdo2Ljy

Vista d'insieme (parte USA e parte canadese):
http://www.uaecbc.com/wp-content/uploads/2010/11/Niagara-Falls.jpg

http://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Niagara_falls_aerial.id.jpg/800px-Niagara_falls_aerial.id.jpg

Mi pare di capire che chiusero solo quelle sullo sfondo, mentre la "parte famosa" è quella in primo piano.

[Paganetor]

be', ancora oggi in estate vengono ridotte moltissimo a causa del ridotto afflusso di acqua e del fatto che una buona parte viene deviata per alimentare la locale centrale idroelettrica ;)

[Ziosilvio]

http://en.wikipedia.org/wiki/Niagara_falls
A team from the U.S. Army Corp of Engineers dammed the falls in June of 1969 in order to clear rock from the base of the falls. Rockslides had caused a significant buildup of rock at the bottom of the American side of the falls, and it the engineers were to clean up the rock and repair some faults to prevent eventual erosion of the American side of the waterfall. A temporary dam was constructed to divert the flow of water to the Canadian side; the dam measured 600 feet across and was made of nearly 30,000 tons of rock. The engineers cleared the rock debris and tested for saftey, finishing the project in November of that year. The temporary dam was blown up to restore water flow.

[*sasha ITALIA*]

ne avevano di soldi da buttare...

[paulus69]

se non ricordo male...poco meno di 400m separano ormai l'huron dal Superiore;come dire che se non si sbrigano ad attuare(se mai possibile) una riduzione più che consistente della portata delle cascate...fra 120/140 anni potremo anche smettere di chiamarle cascate del Niagara ma del Superiore.:O
edit:i laghi sono Erie e Ontario,mannaggia la mia superficialità..