American Society of Civil Engineers

Rectangular Lateral Orifices in Open Channels

by Amruthur S. Ramamurthy, M.ASCE, (Prof. of Civ. Engrg., Concordia Univ., Montreal Quebec, Canada), Udoyara S. Tim, (Grad. Student, Dept. of Civ. Engrg., Concordia Univ., Montreal, Quebec, Canada), and Semaan Sarraf, A.M.ASCE, (Asst. Prof., Dept. of Civ. Engrg., Concordia Univ., Montreal, Quebec, Canada)

Journal of Environmental Engineering, Vol. 112, No. 2, March/April 1986, pp. 292-300, (doi:

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Document type: Journal Paper
Abstract: The theory of lateral flow through a two-dimensional channel outlet is used to derive an expression for the flow through a rectangular lateral orifice discharging from a rectangular channel. The orifice discharge coefficient is expressed as a function of a parameter relating he length of the orifice and the width of the main channel and a parameter denoting the ratio of the mean velocity in the main channel to the resultant velocity of the jet through the orifice. Experimental results are provided to validate the proposed expressions for the orifice discharge coefficient.

ASCE Subject Headings:
Open channels
Water discharge
Flow distribution