Effect of perforation shape and pattern on the performance of drain pipes

In earlier calculations of the entrance resistance of perforated drain pipes, the basic assumption was made that no important error is introduced by not taking into account the presence of the pipe wall as an impermeable surface. This assumption was tested using an electrolytic model, and it was sho...

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Bibliographic Details
Published in:Agricultural water management 1981-01, Vol.4 (4), p.429-443
Main Authors: Dierickx, W., Van Der Molen, W.H.
Format: Article
Language:English
Subjects:
Cultuurtechniek
Division of Drainage and Reclaiming of Lands
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Summary:In earlier calculations of the entrance resistance of perforated drain pipes, the basic assumption was made that no important error is introduced by not taking into account the presence of the pipe wall as an impermeable surface. This assumption was tested using an electrolytic model, and it was shown that the calculated values were approximately one half of the measured entrance resistance values. By adding a central source of strength which is half the total strength of the sinks that simulate the perforations, an impermeable wall is simulated and exact results are obtained, as shown by accurate mathematical calculation for particular cases. Based on these experiments, modified formulae have been derived for continuous longitudinal slits, circular perforations and discontinuous longitudinal slits.
ISSN:0378-3774
1873-2283
DOI:10.1016/0378-3774(81)90031-7