The bank of a river on the inside of the curve, on which material is deposited due to the lower current here, is called a sliding slope . The bank on the outside of the curve is known as the impact slope . The stronger current here removes material. The terms are used in connection with the meandering of a river. The loops of a river shift over time as a result of the erosion processes. If a migrating impact slope meets another impact slope at the rear, a meander breakthrough occurs.