Research Article
May 1976
Roughness Effects on Rectangular Free Overfall
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VIEW THE REPLYAuthors: Nallamuthu Rajaratnam, M.ASCE, Durfakula Muralidhar, and Spyridon BeltaosAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 102, Issue 5
Abstract
For a rectangular free overfall, the end depth ratio (EDR) has been well connected with the main parameters using dimensional analysis. Using experimental results on three different roughnesses, it has been found that the EDR can be predicted from the curve Delleur, et al., for smooth channels, if the relative roughness ks/ydac (in which ks is the Nikuradse equivalent sand roughness and yc is the critical depth) is less than about 0.1. If ks/yc is greater than 0.1, then the EDR is reduced by the roughness and this effect has been correlated using the experimental results. A method has been proposed to predict the discharge from the measured end depth for a rough rectangular free overfall.
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Published In
Journal of the Hydraulics Division
Volume 102 • Issue 5 • May 1976
Pages: 599 - 614
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: May 1976
Published online: Feb 3, 2021
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Authors
Affiliations
Nallamuthu Rajaratnam, M.ASCE
Prof., Dept. of Civ. Engrg., Univ. of Alberta, Edmonton, Alberta, Canada
Durfakula Muralidhar
N.Y. State Dept. of Environmental Conservation, Albany, N.Y.; formerly, Research Assoc., Dept. of Civ. Engrg., Univ. of Alberta. Edmonton, Canada
Spyridon Beltaos
Research Officer, Alberta Research Council, Highways and River Engrg. Div., Edmonton, Canada; formerly, Grad. Student, Dept. of Civ. Engrg., Univ. of Alberta, Edmonton, Canada
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