Answer
Several factors influence flow velocity in a stream. These include the slope or gradient of the stream channel, where steeper slopes generally result in higher flow velocities. The cross-sectional area of the channel also affects flow velocity; a wider channel with greater area allows the water to flow more slowly. Additionally, the roughness of the channel bed and banks can influence flow velocity, with rougher surfaces causing more friction and reducing flow speed. Finally, the amount of water in the stream, known as the discharge, directly affects flow velocity, with higher discharges leading to faster flow rates.
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