A1 River discharge and channel characteristics

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Last updated 3:47 PM on 5/29/26
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12 Terms

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River discharge
The volume of water flowing in a river per second, measured in cumecs (m³/s)
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Stream flow
The movement and speed of water in a river channel
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Channel characteristics
Features of a river channel such as width, depth, roughness, and shape that affect flow
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Hydraulic radius
The ratio between the river’s cross-sectional area and wetted perimeter, affecting efficiency of flow
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Wetted perimeter
The part of the channel bed and banks in contact with water
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High hydraulic radius
Less friction and faster river velocity
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Low hydraulic radius
More friction and slower river velocity
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River velocity
The speed at which water flows in a river
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Bradshaw Model
A model showing downstream changes in rivers such as increased discharge, width, depth, and velocity
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Downstream trends
Changes in river characteristics from source to mouth
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Wetted perimeter
The length of the river bed and banks touching the water
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How to calculate hydraulic radius?
Cross Sectional Area/Wetted perimeter