The V-Shaped Broad-Crested Weir

by Wubbo Boiten, Research Engr.; Delft Hydraulics Lab., Wageningen Branch, Nieuwe Kanaal 11, 6709 PA Wageningen, The Netherlands,
Remmet H. Pitlo, Research Engr.; Hydraulics Lab., Agricultural Univ., Wageningen, The Netherlands,

Serial Information: Journal of the Irrigation and Drainage Division, 1982, Vol. 108, Issue 2, Pg. 142-160

Document Type: Journal Paper


A discharge measurement structure with a triangular control section and a broad crest provides a rather wide measuring range while the head-discharge relation remains unaffected by tailwater up to a high submergence ratio. Experiments with the V-shaped broad-crested weirs have been carried out in order to investigate the influence of a boundary layer above the crest. The boundary displacement thickness is replaced by a correction height which includes the effects of a non-uniform velocity distribution, non-parallel streamlines and lateral pressure gradients. The experiments have results in a large collection of laboratory data with the aim to derive the head-discharge relations for different shapes under free flow as well as submerged flow conditions. The weir can be constructed with a fixed crest or a movable crest in vertical runways. The maximum discharge depends on the chosen dimensions. The structure is a suitable device for small and moderate discharges. Results of investigation, design rules and limits of application are given.

Subject Headings: Submerged flow | Weirs | Water discharge measurement | Drop structures | Head (fluid mechanics) | Velocity distribution | Lateral pressure | Free flow

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