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In a straight channel of a stream, at which point the water is the fastest?

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Question added by Cherif Ameur LABIAD , Senior Hydraulic Engineer , ANRH
Date Posted: 2015/12/30
JONATHAN  COX
by JONATHAN COX , Consultant/ Senior Lecturer in Hydrology /Flood Manager , Caribbean Institute for Meteorology and Hydrology

The highest velocity will normally be found in the centre of the channel at 90% of the depth from the river bed, i.e. 10% of the depth below the surface. The maximum velocity is not found on the surface as many would suppose due to the effects of friction with the air.

Djordje Calic
by Djordje Calic , Assistant , Faculty of Mining and Geology, University of Belgrade

Water is fastest on the surfase in the midle

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