Hydraulic Performance of Aggregate Beds with Perforated Pipe Underdrains Flowing Full
Publication: Journal of Irrigation and Drainage Engineering
Volume 140, Issue 8
Abstract
Results are presented from an experimental study of the stage discharge relationship for a porous pipe buried under loose laid aggregate. A series of steady-state experiments were performed in which the depth of flow over the pipe was measured for a given pipe discharge. The stage-discharge relationship for the entire system is well described by an orifice equation when the water surface in the aggregate trench was horizontal and the pipe was running full at the outlet. An energy equation analysis shows that the dominant energy losses are due to flow through the small side wall orifices into the pipe and from friction losses along the pipe. Friction losses in the aggregate are shown to be negligible, which again supports the orifice equation model. Discharge coefficients are reported for three commonly available porous pipes. The results of this research can be used in the sizing and placement of subsurface drains in aggregate filled storm water infiltration practices such as infiltration trenches and porous pavements.
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Acknowledgments
The authors would also like to thank Danny Metz, Scott Black, and Warren Scovill for their assistance with the test equipment and instrumentation, Tripp West for assistance with the characterization of the aggregate properties, and Dane Rosier for assisting with the running of the experiments. The authors would also like to thank the anonymous reviewers for their detailed critiques of this paper that have enabled the authors to significantly improve it during the review process.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 140 • Issue 8 • August 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 27, 2013
Accepted: Feb 10, 2014
Published online: Apr 2, 2014
Published in print: Aug 1, 2014
Discussion open until: Sep 2, 2014
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