Head Losses in Junction Manholes for Free Surface Flows in Circular Conduits
Publication: Journal of Hydraulic Engineering
Volume 140, Issue 9
Abstract
Former studies on combining flows resulted in an efficient layout of sewer junctions operated under supercritical approach flow conditions. Straight extensions allowed a reduction in the shock wave heights generated by the merging flows, so that the global discharge capacity was significantly increased. Herein, an extensive experimental campaign is presented on a physical model with the aforementioned layout, although with generalized geometrical conditions now including various conduit diameters. The effects of the main parameters governing the energy losses for combining flows were ascertained to enhance the information available from the literature. The results and their analysis provide a basis for the prediction of energy losses at junction manholes with different upstream and lateral conduit diameters and various flow conditions.
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Acknowledgments
The measurements were conducted by Mr. Dimitri Simos, Mr. Timur Gökok, and Mr. Emmanuel Niedermann as Master Theses at LCH. The project was financially supported by the City of Zurich (ERZ Entsorgung + Recycling Zurich). The Laboratory of Hydraulics, Hydrology and Glaciology (VAW) of ETH Zurich provided model elements.
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Published In
Journal of Hydraulic Engineering
Volume 140 • Issue 9 • September 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 26, 2013
Accepted: Feb 26, 2014
Published online: Apr 28, 2014
Published in print: Sep 1, 2014
Discussion open until: Sep 28, 2014
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