Maghrebi has previously introduced a model for the production of isovel contours in a normalized form, which can be used for estimation of discharge in artificial and natural channels. The model is applied to a tidal river with partially reverse flow, which is caused by opening a sluice gate located asymmetrically close to the right bank of the Ohta floodway in Hiroshima, Japan. An acoustic Doppler current profiler (aDcp) was used to measure the velocity profiles at different verticals and then discharge was calculated. In addition, the estimated discharge based on each measured point and the predicted isovels of flow cross section was obtained. The results show that the associated errors for the measured points away from the solid boundaries and the imaginary boundary between the flow directed from the Gion bridge to the sea and the reverse flow in the recirculation zone in the opposite direction, which are associated with lower absolute values of isovels, are reasonable. The overall results of the estimated average discharge using vertical and horizontal groupings of the measured points show that the corresponded fluctuation of errors are large and small, respectively.

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