American Society of Civil Engineers


Generalized Rectangular Weir Equations


by Prabhata K. Swamee, (Prof. of Civ. Engrg., Univ. of Roorkee, Roorkee - 247 667, India)

Journal of Hydraulic Engineering, Vol. 114, No. 8, August 1988, pp. 945-949, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9429(1988)114:8(945))

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Document type: Technical Note
Abstract: Most of the existing weir formulas lose their significance as the ratios of head to height or head to width become large. A full range equation valid for all values of head-to-height ratio has been developed for a sharp crested weir. Also for finite crested weirs a full range equation valid for all values to head-to-width ratio has been presented. This equation covers narrow crested, broad crested and long crested weirs. Providing a smooth transition between sharp crested and finite crested weir equations, a generalized rectangular weir equation has been evolved. This equation is applicable to all head-to-height ratios and all head-to-width ratios or sharp crested and finite crested weirs. This equation is applicable to all types of rectangular weirs-sharp crested or broad crested, and sills. It is hoped that the equation will be useful for analysis and design purposes.


ASCE Subject Headings:
Flow rates
Weirs