Hydraulics of Broad-Crested Weirs with Varying Side Slopes
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Volume 135, Issue 1
Abstract
The flow of water over a trapezoidal, broad-crested, or embankment weir with varying upstream and downstream slopes has been investigated. Data are presented comparing the effect of slopes of , and vertical in various combinations on the upstream and downstream faces of the weir. Pressure and surface profiles were self-similar for all cases tested. Increasing the upstream slope to the vertical decreased the height of the surface profile and, hence, the static pressure of the crest. It also reduced the discharge coefficient. The variation in downstream static pressures was negligible though. Varying the downstream slope had a negligible effect on the surface and pressure profiles over the weir. Changes in flow were constrained to the region downstream of the crest. Cavitation could occur at the downstream corner of the weir if the upstream head was sufficiently high and a sloped face was used. This paper presents data that will be of use in the design of hydraulic structures for flow control and measurement.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 135 • Issue 1 • February 2009
Pages: 115 - 118
Copyright
© 2009 ASCE.
History
Received: Jan 9, 2008
Accepted: May 27, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
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