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They are 150 metres (490 ft) wide and 23 metres (75 ft) high. In the winter months, the average water flow is 250 m3/s (8,800 cu ft/s), while in the summer, the average water flow is 600 m3/s (21,000 cu ft/s). The highest flow ever measured was more than 1,250 cubic metres per second (44,000 cu ft/s) in 1999, and the lowest, 95 cubic metres per second (3,400 cu ft/s) in 1921.
The falls cannot be climbed by fish, except by eels that are able to worm their way up over the rocks.
The Rhine Falls were formed in the last ice age, approximately 14,000 to 17,000 years ago,
by erosion-resistant rocks narrowing the riverbed.
The first glacial advances created today's landforms approximately 500,000 years ago.
Up to the end of the Wolstonian Stage approximately 132,000 years ago, the Rhine flowed westwards
from Schaffhausen past Klettgau. This earlier riverbed later filled up with gravel.
About 132,000 years ago the course of the river changed southwards at Schaffhausen and formed a new channel,
which also filled up with gravel. Part of the Rhine today includes this ancient riverbed.
Text from:
en.wikipedia.org/wiki/Rhine_Falls
More:
rheinfall.ch/en/
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