Parametric Study of Perforated Pipe Underdrains Surrounded by Loose Aggregate
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 12
Abstract
A detailed computational parametric study of a perforated pipe underdrain surrounded by loose aggregate has been conducted. Several controlling geometric parameters (i.e., trench width, head, aggregate depth over the pipe, pipe wall perforation area per unit length of pipe, and the area of individual perforations) were considered and the variation of pipe discharge characteristics as a function of these parameters has been quantified. Results indicate that, for each combination of these parameters, there is a finite pipe length after which discharge does not increase with increasing pipe length. This pipe length depends on the pipe wall perforation area per unit length of pipe, pipe cross-sectional area, and losses associated with them. It was found that the effective pipe system discharge coefficient is independent of the channel width, aggregate depth, and head over the pipe for the range of parameters tested. The computational fluid dynamics (CFD) results were used to develop an equation for the system discharge coefficient as a function of the pipe geometry. This equation can be used for sizing underdrains in low-impact development (LID) best management practice (BMP) stormwater systems. These results have practical applications in many stormwater LID/BMPs of similar setup to that used in this study (e.g., porous pavements and infiltration trenches) for sizing and analyzing the hydraulic behavior of the underdrains. This allows design engineers to quantify the peak outflow from the underdrain when the systems are flooded.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 19, 2016
Accepted: May 27, 2016
Published online: Aug 1, 2016
Published in print: Dec 1, 2016
Discussion open until: Jan 1, 2017
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