Discharge coefficient for trapezoidal side weir

Abstract The designed length of the rectangular side weirs sometimes becomes too long that makes it non-practical from the engineering point of view. In order to decrease the length of channel opening with the desired water height, this study focuses on applying trapezoidal geometry for side weirs. The discharge coefficient needs to be found experimentally for any kinds of trapezoidal side weirs. For this study experimental tests have been carried out for trapezoidal side weir in order to obtain the discharge coefficient. The main dimensionless variables for the tests include: Upstream end Froude number ( F 1 ) , w / y 1 , L / B , L ′/ L , w / L ′ and sin ( α ). Finally, the relationship for De-Marchi’s coefficient in subcritical flow for trapezoidal side weir is presented based on the non-dimensional parameters of weir and flow. Eventually, all the data points are within ±10% limit, which shows the accuracy of the results of this study.

[1]  Amruthur S. Ramamurthy,et al.  Nonlinear PLS Method for Side Weir Flows , 2006 .

[2]  Kenneth V. H. Smith,et al.  Closure of "Experimental Investigation of Flow Over Side Weirs" , 1978 .

[3]  Mauro Fiorentino,et al.  Hydraulic features of supercritical flow along prismatic side weirs , 2001 .

[4]  Praxitelis A. Argyropoulos,et al.  Discussion of Spatially Varied Flow over Side-Weirs by Kanakatti Subramanya and Subhash Chandra Awasthy , 1972 .

[5]  Dominic E. Reeve,et al.  Hydraulic Modelling – an Introduction , 2010 .

[6]  E. R. Holley,et al.  Modeling Side-Weir Diversions for Flood Control , 1988 .

[7]  Kittur G. Ranga Raju,et al.  Side Weir in Rectangular Channel , 1979 .

[8]  W. Hager.  Lateral Outflow Over Side Weirs , 1987 .

[9]  Nihat Kaya,et al.  Discharging capacity of rectangular side weirs in straight open channels , 2011 .

[10]  Nihat Kaya,et al.  Discharge coefficient of a semi-elliptical side weir in subcritical flow , 2011 .

[11]  Olivier Blanpain,et al.  Free surface measurement of flow over side weirs using the video monitoring concept , 2004 .

[12]  Hin-Fatt Cheong.  Discharge Coefficient of Lateral Diversion from Trapezoidal Channel , 1991 .

[13]  V. T. Chow.  Open-channel hydraulics , 1959 .

[14]  Mohammad Ali Nekooie,et al.  Triangular labyrinth side weirs with one and two cycles , 2013 .

[15]  Willi H. Hager,et al.  Hydraulics of Embankment Weirs , 1998 .

[16]  Henry T. Falvey,et al.  Hydraulic Design of Labyrinth Weirs , 2002 .

[17]  Masoud Ghodsian.  Supercritical flow over a rectangular side weir , 2003 .

[18]  Nihat Kaya,et al.  Discharge Capacity of Labyrinth Side Weir Located on a Straight Channel , 2010 .

[19]  Nihat Kaya,et al.  Discharge Coefficient for Trapezoidal Labyrinth Side Weir in Subcritical Flow , 2011 .

[20]  H. Uysal,et al.  The effects of different cement dosages, slumps, and pumice aggregate ratios on the thermal conductivity and density of concrete , 2004 .

[21]  Özgür Kisi,et al.  Predicting discharge capacity of triangular labyrinth side weir located on a straight channel by using an adaptive neuro-fuzzy technique , 2010, Adv. Eng. Softw..

[22]  T. Nadesamoorthy,et al.  Discussion of Spatially Varied Flow over Side-Weirs by Kanakatti Subramanya and Subhash Chandra Awasthy , 1972 .

[23]  H. Uysal,et al.  The effects of different cement dosages, slumps and pumice aggregate ratios on the compressive strength and densities of concrete , 2003 .

[24]  Kanakatti Subramanya,et al.  Spatially Varied Flow over Side-Weirs , 1972 .

[25]  D. Manivannan,et al.  Discharge Coefficient of Rectangular Side Weirs , 1994 .

[26]  W. Hager,et al.  Hydraulic modelling – an introduction: principles, methods and applications , 2010 .

[27]  M R Jalili,et al.  DISCUSSION OF DISCHARGE COEFFICIENT OF RECTANGULAR SIDE WEIR , 1996 .

[28]  Seyed Mahmood Borghei,et al.  Discussion of “Discharge Capacity of Labyrinth Side Weir Located on a Straight Channel” by M. Emin Emiroglu, Nihat Kaya, and Hayrullah Agaccioglu , 2011 .

[29]  Masoud Ghodsian,et al.  DISCHARGE COEFFICIENT FOR SHARP-CRESTED SIDE WEIR IN SUBCRITICAL FLOW , 1999 .