Erosion in the drainage area results in silts deposits in the reservoir. Which term best describes this process?

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Erosion removes soil from the drainage area, but the silts that reach the reservoir settle out of the water as the flow slows. This deposition of sediments in the reservoir is called sedimentation. Transpiration is a plant-water loss process, dissipation means energy loss, and erosion describes removal, not the filling of the reservoir with sediments.