Drain Tube Opening Effects on Drain Inflow
Publication: Journal of Irrigation and Drainage Engineering
Volume 109, Issue 4
Abstract
Laboratory tests were conducted to determine the effects of total opening area, location of openings and gravel envelope on radial flow to 100 mm (4 in.) diam corrugated plastic drains. Radial flow theory was used to evaluate the effective drain tube radius, and the drainage transfer coefficient for the corrugated tubes. The effective radius increased with total perforation area as expected, but the location of the drain tube perforation had little effect on The greatest increase of effective radius for an increase in perforation area occurred between areas of where increased from 5 mm to about 21 mm. Use of a 50 mm thick gravel envelope resulted in an increase in the effective drain radius for a 100 mm diam pipe from 5–36 mm. Experimental results for the effective radius were compared to theoretical values obtained from an earlier solution for circumferential openings. The experimental results were in close agreement with predicted values for a 1.0 mm opening width.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 109 • Issue 4 • December 1983
Pages: 393 - 404
Copyright
Copyright © 1983 ASCE.
History
Published online: Dec 1, 1983
Published in print: Dec 1983
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