how much erosion is done by a river in a normal flow?

Answer 1

What is normal.
What is the soil and vegetation.
What is the flow and volume....

Missing a lot of data.

Answer 2

This depends entirely on several factors. What you call 'normal flow' is not a constant for all rivers, some rivers count as average flow tens of thousands of cubic metres a second, whereas others only count in the hundreds. Another factor is the geological composition of the terrain the river crosses, erosion will be greater in sandstone than in granite, for example. Finally, and equally important is the gradient, the steeper the gradient, the faster the water flow, the greater the erosion.

Answer 3

It does depend what is "normal" for a given river in question and this is primarily a function of rainfall, gradient, bedrock and catchment area. Vegetation cover of a river's banks is also a factor.
A river tends to be erosional at its source and an agent of deposition in its lower reaches and where is enters the sea.
In periods of flooding however, a river may well erode its lower flood plains and delta. It is during these flood episodes that the majority of erosion takes place, not during normal flow.

Answer 4

It depends on a lot of variables. The suface the river is running through the speed of the river, thinks like that.

Answer 5

It depends upon the gradient of river, the volume of water, the structure and compostion of rocks of the vally, river pass through.