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Darcy-Weisbach: Based on studies on flows in pipes and closed conduits by various authors.
Brown, G.O., 2002, The history of the Darcy-Weisbach equation forpipe flow resistance, Proceedings and invited papers for the ASCE 150thanniversary (1852-2002), November 3-7, 2002, Washington, D.C.; Sponsored byEnvironmental and Water Resources Institute of the American Society of CivilEngineers, EWRI National History and Heritage Committee; editors: Rogers, J.R.and Fredrich, A.J. Pp 34-43.

f Darcy-Weisbach friction factor
V Cross sectional average velocity, in feet per second
R Hydraulic radius, in feet
S Slope, in feet per feet
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