Wetted Perimeter()

WettedPerimeter(Distances, Elevations, Stage)

Returns the wetted perimeter of the channel at the given stage.

Input:       Distances = Horizontal distances across the channel (numbers)

                  Elevations = Channel bed elevations at each horizontal location (numbers)

                 Stage = Stage at which to calculate the wetted perimeter (number)

Output:      Channel wetted perimeter at the given stage, in the same units as distances, elevations, and stage (number)

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