LeftBank(Distances, Elevations, Stage)

Returns coordinates defining left bank of 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 location of the left bank (number)

Output:      Coordinates defining the left edge of the channel (vector)

Notes:  To return both horizontal and vertical coordinates, see the Vector Functions reference

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