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Discharge Characteristics of Sharp Crested Weir of Curved Plan-form

Author Affiliations

  • 1 Department of Civil Engineering, Graphic Era University, Dehradun, Uttarakhand, INDIA
  • 2 Department of Civil Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, INDIA
  • 3 Department of Civil Engineering, ZHCET, AMU, Aligarh, INDIA

Res. J. Engineering Sci., Volume 1, Issue (4), Pages 16-20, October,26 (2012)


Weirs have been widely used for the purpose of flow measurement and flow control in open channels. Generally they are used as normal weirs. For the purpose of flow diversion they can also be used as side weirs or skew weirs. Various weirs of modified plan form have been suggested in the past to enhance their discharging capacity with minimum head over the weirs and to restrict the afflux. Presented in this paper are results of experimental study carried out to investigate the discharging capacity of a sharp-crested curved plan-form weirs under free flow conditions in a rectangular channel with weir height 0.18 m and vertex angles ranging from 45&drg; to 120&drg;. The equations for the discharge coefficient of curved weirs have been proposed. The results show that there is a gain of about 40% in discharge over a curved weir with vertex angle of 90° as compared to a normal weir. Finally, equations for discharge coefficient for all tested curved weirs in a free flow situation have been proposed.


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