Explanation of paradoxes in DupuitForchheimer seepage theory. / Don Kirkham.
Material type: TextSeries: Vol.12 No. 1Publisher: Lahore: West Pakistan Engineering congress, West Pakistan Engineering congress, 1967Description: 39 pages: Illustrations, 28cmSubject(s): Soil  SeepageDDC classification: 530 EXP 1967Item type  Current location  Call number  Status  Date due  Barcode 

Report 
Irrigation Research Institute Library  Punjab Irrigation Department

530 EXP 1967 (Browse shelf)  Available  PIDIRI0000013807 
Introduction
Definition of a D.F Soil
Two false flow models
Cutting into a porous medium of a large number of vertical, parallel, infinitely permeable, equally spaced, infinitesimally thin slots produces a fictitious soil that follows, exactly and without paradoxes Dupuit's assumptions and hence DupuitForchheimer (D.F.) drainage theory in two dimensions. A soil having these infinitesimally thin slots is designated a D.F. soil. For this fictitious soil, a formula for the proper depth and spacing of ditches and drain tiles is derived. The formula is the same one found in conventional D.F. literature. The formula, valid for both tiles and ditches and known to hold approximately for actual soils, is exact for a D.F. soil. Dupuit's twodimensional ‘parabolic seepage problem’ and others may now be considered as exactly solvable for D.F. soils. For threedimensional axially symmetric seepage flow, as into wells, the fictitious slots of a DF. soil become concentric coaxial rings. DF. streamlines are not horizontal; they converge in a special way. (Key words: Drainage; groundwater; seepage; hydraulics)
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