<P> A hydropower resource can be evaluated by its available power . Power is a function of the hydraulic head and rate of fluid flow . The head is the energy per unit weight ( or unit mass ) of water . The static head is proportional to the difference in height through which the water falls . Dynamic head is related to the velocity of moving water . Each unit of water can do an amount of work equal to its weight times the head . </P>
<P> A hydropower resource can be evaluated by its available power . Power is a function of the hydraulic head and rate of fluid flow . The head is the energy per unit weight ( or unit mass ) of water . The static head is proportional to the difference in height through which the water falls . Dynamic head is related to the velocity of moving water . Each unit of water can do an amount of work equal to its weight times the head . </P>
which term means the amount of energy in a body or stream of water
which term means the amount of energy in a body or stream of water
power
power