Apart from the water flow, the difficulty of the river is caused by the relatively steep average river gradient of 1.23 %.
2.
In 1892, Ewald Bellingrath introduced the following general rule : at an average river gradient of 0.25 0 paddle steamers are superior.
3.
River gradient ranges from more than 10 meters / km for major upper tributaries in the mountains to as little as 6 cm / km as the lower Kosi nears the Ganges.
4.
It debouches in to the Pacific after dropping over a height of over in its short stretch of from the source and thus having a river gradient of 3.6 % ( close to a highway gradient ).
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