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Open AccessArticle

Discharge Coefficient of a Round-Crested Weir

State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
Author to whom correspondence should be addressed.
Water 2019, 11(6), 1206;
Received: 17 May 2019 / Revised: 3 June 2019 / Accepted: 4 June 2019 / Published: 10 June 2019
(This article belongs to the Section Hydraulics and Hydrodynamics)
A model experimental study was conducted for the discharge capability of different shapes of the crest of a weir. The flow rate and the head over the weir measured by laboratory experiments were used as two parameters for characterizing the head discharge relationship. Experiments indicated that the head discharge relationship for different radii located upstream and downstream of the crest of the weir had different features. A series of detailed experiments investigated the effects of different upstream rounding radii on the discharge capability when the downstream rounding radius was constant and the round ratio between the radius of the rounded upstream corner to the weir breath in the direction of flow was equal to 1.00. Experimental results showed that the rounded upstream corner could increase the discharge capability. The discharge capability increased as the upstream round ratio became larger and did not change when the round ratio varied from 0.10 to 0.30 and from 0.75 to 1.00 in this experiment. Based on the experimental data distribution, the empirical formula for the discharge coefficient was fitted with the round ratio as the group parameter. View Full-Text
Keywords: round-crested weir; flow rate; discharge coefficient; body shape round-crested weir; flow rate; discharge coefficient; body shape
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MDPI and ACS Style

Gong, J.; Deng, J.; Wei, W. Discharge Coefficient of a Round-Crested Weir. Water 2019, 11, 1206.

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