The term wetted perimeter is common in Civil Engineering and also in heat transfer applications. Associated with the hydraulic diameter. The term is simply defined using the example of a cross section of a river. The wet perimeter is as it sounds, the perimeter of the cross sectional area that is "wet". In a practical experiment one is able to measure the wetted perimeter with a tape measure weighted down to the river bed to get the true measurement. The hydraulic diameter, , is a commonly used term when handling flow in noncircular tubes and channels. ...
WP = W + 2D
The wetted perimeter in the figure to the right can simply be calculated by: b + c + d
Note: a is not included because it is a free surface.
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