LAUSR

Abstract Experimental results on the discharging capacity of inclined sharp crested weirs are presented. Three non-rectangular notch shapes such as parabolic, semi-circular and inverted semicircular notches were considered in the study. It is found that the theoretical discharge increases nonlinearly with an increase in flow depth over the crest of the notch and inclination of the notch with vertical. The regression equations are developed between the non-dimensional theoretical discharge and non-dimensional flow depth over the crest. The regression coefficients are found to be the function of the angle of inclination of the notch. Further, the actual discharge varies linearly with the theoretical discharge, with coefficient of discharge being the function of angle of inclination of the notch with vertical. The average coefficient of discharge for parabolic, semi-circular and inverted semicircular is found to be 0.638, 0.796 and 0.77, respectively. In addition, the discharging index for the inclined notches are defined which increases with an increase in inclination of the notch with vertical.