River discharge: Q = A × v

Enter the width, average depth and velocity of a river to see the cross-sectional area and discharge.

Works in metric or imperial units.

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Questions students ask

How do you measure river velocity in fieldwork?

Time a float over a measured distance, repeat it, and take the average. Multiply by about 0.8 to allow for slower water near the bed.

What formula does it use?

Q = A × v (m³/s).

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