Slowly
but unstoppable move the ice masses of the Perito Moreno towards the
banks of the Brazo Rico, a branch of the Largo Argentino, and block the
outlet of this part of the lake. While on the eastern side the water
can still drain through the Largo Argentino, the precipitation of the
surrounding mountains swell on the opposite side. If the water masses
don‘t find a way through the blockage in the following months, the
pressure on this wall of ice becomes too much and it will burst in a
thundering roar. Then the water pours out in a mighty flood into the
Largo Argentino.
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