Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2007.1164.1169IzadjooFarhadMahmood Shafai-Bejestan8200778Hydraulic jump stilling basins are used as an energy dissipater structures downstream of gates, spillways and weirs. In the present study the effect of trapezoidal shape corrugated bed on flow characteristics of hydraulic jump has been experimentally investigated. Total of 42 tests conducted in a flumes of 25 and 50 cm in width. Experimental were performed for wide range of Froude numbers ranging from 4 to 12. Six values of the relative roughness of corrugated shapes were studied. In all tests water surface profile and in 10 tests the vertical and the axial velocity profile were measured. From the analysis of data, the relative conjugate depths and the length of hydraulic jump were plotted against the Froude number. Comparison of these parameters with the same parameters in smooth bed hydraulic jump shows that the conjugate depth decreases 20% and the hydraulic jump length decreases 50%. These results show that corrugating the stilling bed can decrease the cost of stilling basin.]]>Ead, S.A. and N. Rajaratnam,2002Ead, S.A., N. Rajaratnam, C. Katopodis and F. Ade,2000Hager, W.H.,1992Hughes, W.C. and J.E. Flack,1984Leutheusser, H.J. and E.J. Schiller,1975McCorquodale, J.A.,1986Ali, H.S.M.,1991Peterka, A.J.,1958Rajaratnam, N.,1967Rajaratnam, N.,1968