American Society of Civil Engineers

Discharge Capacity of Labyrinth Side Weir Located on a Straight Channel

by M. Emin Emiroglu, (Associate Professor, Dept. of Civil Engineering, Firat Univ., 23279 Elazig, Turkey. E-mail:, Nihat Kaya, (Assistant Professor, Dept. of Civil Engineering, Firat Univ., 23279 Elazig, Turkey. E-mail:, and Hayrullah Agaccioglu, (Professor, Dept. of Hydraulic Engineering, Yildiz Technical Univ., 34349 Istanbul, Turkey. E-mail:

Journal of Irrigation and Drainage Engineering, Vol. 136, No. 1, January 2010, pp. 37-46, (doi:

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Document type: Journal Paper
Discussion: by A. Parvaneh E-mail: and et al.    (See full record)
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Abstract: Side weirs, also known as lateral weirs, are flow diversion devices widely used in irrigation as a head regulator of distributaries and escapes, land drainage, and urban sewage systems. The studies on the subject have been generally focused on rectangular and triangular side weirs located on a straight channel. However, the same is not true for labyrinth side weirs. The current studies deal with sediment transport and scour problems around side weirs and lateral structures. The investigation of the hydraulic effects of labyrinth side weirs to increase discharge capacity of them has been studied in this particular work. In the study, 2,830 laboratory tests were conducted for determining discharge coefficient of labyrinth side weirs, and results were analyzed to find the influence of the dimensionless weir length L/b, the dimensionless effective length L/ℓ, the dimensionless weir height p/h1, triangular labyrinth side weir included angle θ, and upstream Froude number F1 on the discharge coefficient, water surface profile and velocities in the channel along the side weir. It has been found that discharge coefficient of labyrinth side weirs gives pretty higher coefficient value compare to that of classical side weirs and a reliable equation for discharge coefficient of labyrinth weirs is presented. Discharge coefficient of the labyrinth side weir is 1.5–4.5 times higher than rectangular side weir.

ASCE Subject Headings:
Hydrologic models
Human factors
Water use

Author Keywords:
Water discharge
Discharge coefficient
Labyrinth weir
Channel flow