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2288. Lacey`s waterway, or Lacey`s wetted perimeter : The wetted perimeter determined by Lacey`s formula P = 1.47 Q 1/2 where P = perimeter in metres, and Q = discharge in cubic metres per second (cumec). In case, where the width of the channel is considerably larger in comparison to the depth of water, the computed perimeter is provided as width. | ||