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Sagot :
The velocity drops when a stream channel widens while the discharge stays constant.
The water in a stream moves at a certain speed. Distance and time are units (e.g., metres per second or feet per second). The stream's velocity is highest midstream, discharge close to the surface, and slowest along the bed and banks of the stream because of friction.
The ratio of cross-sectional area to wetted perimeter is known as the hydraulic radius, or HR or simply R. The cross-sectional area is equal to the width times the depth (W * D) for a hypothetical stream with a rectangular cross section (a stream with a flat bottom and vertical sides). The wetted perimeter for the same hypothetical stream would be calculated as follows: W + 2D = Depth + Width + Depth.
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