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On the figure, the lenght "a" shouldn't be taked into account because is a free surface in contact only with the atmosphere. The wetted perimeter is the perimeter of channel or pipe in contact with the fluid.— Preceding unsigned comment added by 220.127.116.11 (talk • contribs) 2006-09-28T11:34:07
This was fixed a long time ago with a different looking article and figure. +mt 00:08, 16 July 2013 (UTC)