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Determination of Equivalent Radii for Rectangular Drains
Author(s) -
Warrick A. W.
Publication year - 1973
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1973.03615995003700050049x
Subject(s) - radius , envelope (radar) , square (algebra) , drainage , geometry , tube (container) , cross section (physics) , mathematics , function (biology) , geology , mechanics , physics , materials science , engineering , composite material , telecommunications , ecology , radar , computer security , quantum mechanics , evolutionary biology , computer science , biology
A relationship is developed giving the circular drain size which is equivalent to a rectangular drain. A rectangular drain may result when a highly permeable envelope of rectangular cross‐section is used around a buried drainage tube. A plot of r e / √ ab is given as a function of a/b with r e as the circulat drain radius and a and b the semi‐width and semi‐height of the rectangular drain. The minimum value of r e / √ ab is 1.18 and corresponds to a square (which is the case considered by Kirkham and Selim, 1973). The equivalent radius is useful in adapting drainage formulas giving spacings, depth, etc., to rectangular drains.