American Society of Civil Engineers

Design Procedure for Flow Over Side Weirs

by Ali Uyumaz, (Assoc. Prof., Dept. of Civ. Engrg., Istanbul Tech. Univ., Maslak, Istanbul 80626, Turkey; formerly, Assoc. Prof., Dept. of Civ. Engrg., Memphis State Univ., Memphis, TN 38152) and Roger H. Smith, M.ASCE, (Assoc. Prof., Dept. of Civ. Engrg., Memphis State Univ., Memphis, TN)

Journal of Irrigation and Drainage Engineering, Vol. 117, No. 1, January/February 1991, pp. 79-90, (doi:

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Document type: Journal Paper
Discussion: by Willi H. Hager    (See full record)
Abstract: Numerical investigations of flow over side weirs in rectangular and circular channels are reported. Numerical models are obtained from energy principles and solved by a finite difference method. The results are presented in graphic form. Theoretical and experimental equations are presented for the determination of the length of side weirs for rectangular and circular delivery channels. Comparative analyses of side-weir lengths computed for several example cases show that rectangular-channel side-weir procedures generally should not be used for design purposes or for obtaining approximate water-surface profiles along side weirs in a circular channel (except for the special case of a side-weir-height–to–channel-diameter ratio of P/D = 0.66). For all other ratios of P/D, the percent error incurred depends on the basic assumptions involved with the rectangular approximation procedure.

ASCE Subject Headings:
Numerical models
Water discharge
Water surface profiles