In India, the hydro turbines installed in the Himalayan region are facing the erosion problem due to silted water flow mainly during monsoon season caused by sedimentary nature of the rocks which are quite young. Silt flowing in water cause severe damage in the turbine and alter the profile of the runner. Due to change the profile of runner there is accountable change in the performance of hydro turbines like loss in the efficiency of the turbine, noise problem etc. This paper presents the CFD analysis of Pelton turbine to evaluate the mass loss of the bucket of runner. The simulations are carried out at different silt size, concentration, jet velocity and shape factor. The results show that splitter is mainly affected area. The CFD results are verified with the field data and they are found to be in good agreement.