The washing away of stream bed material by water channel flow is called?

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Multiple Choice

The washing away of stream bed material by water channel flow is called?

Explanation:
Scour refers to the removal of sediment from the stream bed (or around structures) caused by flowing water. It’s the specific hydraulic engineering term for localized erosion driven by shear stresses and turbulence in the channel, such as the erosion that creates scour holes near bridge piers and abutments. Erosion is the broader process of material being worn away, but scour is the precise term used for sediment removal by channel flow in this context. Deposition or sedimentation describes material settling and building up, not removal, so they don’t fit.

Scour refers to the removal of sediment from the stream bed (or around structures) caused by flowing water. It’s the specific hydraulic engineering term for localized erosion driven by shear stresses and turbulence in the channel, such as the erosion that creates scour holes near bridge piers and abutments. Erosion is the broader process of material being worn away, but scour is the precise term used for sediment removal by channel flow in this context. Deposition or sedimentation describes material settling and building up, not removal, so they don’t fit.

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