I. Introduction
In recent years, demand of electricity has been increased. The use of fossil fuels will cause the environmental pollution. That is why many countries are putting more efforts on the development of renewable energy sources. The one of the major source of energy is water .So the hydro energy source is considered as the most favorable solution to deliver a clean energy. Hydro power plant converts potential energy of the falling water into electrical energy. The basic principle of hydro power is that if water fall from a higher level to a lower level, then the resulting potential energy of water can be used to generate electricity [1].