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 1,250 cubic metres per second (44,000 cu ft/s) in 1965; and the lowest, 95 cubic metres per second (3,400 cu ft/s) in 1921.[3]
The falls can not be climbed by fish, except by eels that are able to worm their way up over the rocks.