Because steeper slopes enhance the flow rate of water runoff by gravity, water erosion is higher the steeper the slope.
The rate of water erosion increased when there was less or no vegetation on the slope. This is due to the fact that vegetation slows down water runoffs, which lowers their ability to carry more silt. The rate of water erosion increases with increasing rainfall intensity. This is due to increased splash erosion, which occurs when water drops hit the ground after falling from the sky, and increased water surface runoffs, which occur when the pace at which water leaves the surface exceeds the rate at which it percolates into the ground.\
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