How about Reverse Filtersby Chesley J. Posey, (F.ASCE), Prof. of Civ. Engrg.; Dept. of Civ. Engrg., Univ. of Connecticut, Storrs, Conn.,
Serial Information: Civil Engineering—ASCE, 1980, Vol. 50, Issue 4, Pg. 78-79
Document Type: Feature article
Reverse or inverted filters allow water to drain freely without carrying away suspended solids. Their pore size must be properly related to the fines being protected. Terzaghi's reverse filter criteria provide the most dependable guidance. Subjective judgement can be removed from the essential requirement that the filter material has neither excess or deficiency of any one size by a simple requirement relating to plot of the grain size data.
Subject Headings: Filters | Drainage | Distinguished engineers | Turbidity | Pore size distribution | Solid mechanics
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