Novel Diversion Structure for Supercritical Flow
Publication: Journal of Hydraulic Engineering
Volume 139, Issue 1
Abstract
In urban drainage systems, it is usually necessary to split the storm water discharge among different sewer branches because of limited flow capacity of either hydraulic structures or sewer lines. For this purpose, sewer sideweirs and leaping weirs are generally used as diversion overflow structures. For supercritical approach flow, the former is not recommended because of the occurrence of hydraulic jumps, whereas the latter requires an outlet located below the approach flow sewer bottom. To overcome these constraints, a novel compact hydraulic structure is proposed. It consists of a frontal rectangular intake, representing the diversion sewer inlet, located in the approach flow sewer and parallel to its bottom. A 6.67:1 scale model was tested over a range of hydraulic and geometrical parameters to determine its head-discharge relationship, developing a dimensionless equation relating the diversion discharge to the geometrical properties of the intake under supercritical flow conditions. The limited hydraulic structure size provides cost-effectiveness and ease of installation and maintenance.
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Acknowledgments
The assistance of Mr. Michele Pagano di Melito during the experimental investigation is gratefully acknowledged.
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Published In
Journal of Hydraulic Engineering
Volume 139 • Issue 1 • January 2013
Pages: 84 - 87
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 3, 2012
Accepted: Jul 6, 2012
Published online: Jul 23, 2012
Published in print: Jan 1, 2013
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