“More commonly and less accurately the permeability is expressed in lugeons, where 1 lugeon is equivalent to a test flow of 1 litre per minute at a pressure of 10 atmospheres; 1 lugeon is approximately 10⁻⁷ ms⁻¹, the limiting permeability of engineering significance.”
Ian W. Farmer.
Engineering Behaviour of Rocks. 2nd ed.
London: Chapman and Hall, 1983.
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Last revised: 7 June 2016.