hydraulic radius

noun
the ratio of the cross-sectional area to the perimeter of a pipe, outlet, or the like, through which a fluid is flowing.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The example in this appendix uses a simplistic model to determine the hydraulic
  radius.
It can be seen from this equation that permissible velocity varies with the
  hydraulic radius.
The hydraulic radius is defined as the area divided by the wetted perimeter.
The hydraulic depth is similar to the hydraulic radius in that both are
  characteristic depths of flow.
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