Changes in Entrance Resistance of Subsurface Drains
Publication: Journal of Irrigation and Drainage Engineering
Volume 119, Issue 3
Abstract
This study was conducted to examine the entrance resistance and head losses in the immediate vicinity of subsurface drains and to measure the change with time just after drain installation. Laboratory experiments were conducted on drain tubes and sandy loam soil excavated from the drain depth. Tubes were tested both with and without a thin fabric envelope. Theoretical and approximate methods of quantifying entrance resistance and head losses were compared to measured results. Changes in hydraulic conductivity, head loss, and entrance resistance in the immediate vicinity of the drains were examined using laboratory soil tanks. The hydraulic conductivity decreased over time. The effective radius, , for the tube without a fabric envelope increased over the test period. The two drains equipped with fabric envelopes had fairly constant values throughout the test period. The resistance factor, , for the tube with no envelope was not constant. The value of increased throughout the test period for the tubes with fabric envelopes. Experimentally determined entrance constant values were initially higher than the theoretical values and then decreased below the theoretical values with time.
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References
1.
Bodman, G. B., and Harradine, E. F. (1938). “Mean effective pore size and clay migration during water percolation in soils.” Soil Sci. Soc. America J., 3, 44–51.
2.
Bouwer, H. (1978). Groundwater hydrology. McGraw‐Hill, New York, N.Y.
3.
Davenport, M. S., and Skaggs, R. W. (1990). “Effects of drain slope and envelope on performance of drainage‐subirrigation systems.” Trans. ASAE, 33(2), 493–500.
4.
Dierickx, W. (1980). “Electrolytic analogue study of the effect of openings and surrounds of various permeabilities on the performance of field drainage pipes.” Commun. Nat. Inst. Agric. Engrg. Merelbeke, Belgium, 77.
5.
Engelund, F. (1953). “On the laminar and turbulent flows of groundwater through homogeneous sand.” Trans. Danish Acad. Tech. Sci., A.T.S. 3, 1–105.
6.
Kirkham, D. (1950). “Potential flow into circumferential openings in drain tubes.” J. Appl. Physics, 21, 655–660.
7.
Mohammad, F. S., and Skaggs, R. W. (1984). “Drain tube opening effects on drain inflow.” J. Irrig. and Drain., ASCE, 109(4), 333–403.
8.
Nieuwenhuis, G. J. A., and Wesseling, J. (1979). “Effect of perforation and filter material on entrance resistance and effective diameter of plastic drain pipes.” Agric. Water Mgmt., 2, 1–9.
9.
Schwab, G. O., and Kirkham, D. (1951). “The effect of circular perforations on flow into subsurface drain tubes.” Agric. Engrg., 35(5), 270–274.
10.
Skaggs, R. W. (1978). “Effect of drain tube openings on water table drawdown.” J. Irrig. Drain. Div., ASCE, 104(1), 13–21.
11.
Sneyd, A. D. (1976). “Effect of semi‐circular arches at drain gaps on drain conductance.” J. Hydr., 30, 293–294.
Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 119 • Issue 3 • May 1993
Pages: 584 - 599
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Mar 27, 1992
Published online: May 1, 1993
Published in print: May 1993
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