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Latest comment: 11 years ago1 comment1 person in discussion
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 24.121.40.109 (talk • contribs) 2006-09-28T11:34:07