As we know the energy from water is used to generate power or electricity. The water that has potential energy carries kinetic energy when it flows and this energy is converted into mechanical energy in the turbines and again it gets converted into electrical energy with the help of the generators. This is the basic process behind hydroelectric power production. So to produce this power we need to construct a power plant. Which has all the equipments like the dams to store water, pipelines to make the water flow, turbines to generate mechanical energy and generators to generate electricity finally power lines to carry the power generated. So a complete set up has to be put up for the production of power using the energy in water.Water energy as such is pure, renewable and useful to the core to the society but the construction of power plants that is used for the extraction or conversion of that energy into electricity has some beneficial effects and non beneficial effects to the society. Let’s just analyze in what way they are useful and harmful to the people.