The Kande–Lucas–Tomasi (KLT) algorithm is used to track features present on the water surface. Analysis of these vectors provides a rare insight into the complexity of channel–overbank interactions during flash floods. The uncertainty attached to the calculated velocities is relatively low, with a spatial average across the area of ±0.15 m s−1. Little difference is observed in the uncertainty attached to out-of-bank velocities (±0.15 m s−1), and within-channel velocities (±0.16 m s−1), illustrating the consistency of the approach

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