The aim of the present work is to study the effect of notches on the performance of the Savonius turbine. Here experiments are carried out for three different configurations of the rotor blade like conventional semi-circular blade, Semi-circular blade with hollow notches on retarding side of the blade, and Semi-circular blade with solid notches on retarding side of the blade. The experiments are carried out in small laboratory canal with 60 cm width, 88.5 cm water depth, and 10 Hp submersible pump. The performance of the turbine is measured in terms of torque, coefficient of torque, power, and coefficient of power. During the study it is found that maximum coefficient of power output of the rotor is 0.107 which is same for conventional rotor and rotor with hollow notches while angular velocity of the rotor with hollow notches is 13.72% higher than that of the conventional rotor and 22.68% higher than that of the rotor with solid notches.