 As the spillway and the power intake are continuously passing sand, they cause abrasion damage to the spillway concrete structure and the turbine equipment.Studies report erosion in the civil structures such as the concrete sill of the spillway, the glacis and the bucket; damage to the turbine components such as cracks in the turbine blades, knife edging of the outer edges and washing out of other components; damage to the cooling system such as tubes being choked with stator faults encountered.NHPC has been using various technical remedies to address these problems.