Sorry, not so much of a problem, more. . I need to understand. 1. The problem statement, all variables and given/known data Finding the net head. This website (http://www.oregon.gov/ENERGY/RENEW/Hydro/Hydro_index.shtml [Broken]), says that the gross or "static" head is the vertical distance between the top of penstock and the point at which the water is discharged from the turbine. It then says "Net head is gross head minus the pressure or head losses due to friction and turbulence in the penstock." I am confused about this statement. How do I go about finding net or "dynamic" head?? If I know the pressure at the top of the penstock, and the pressure at the bottom, how do I apply this information? 2. Relevant equations I'm not sure if any of these are relevant. . . P2-P1 = -y (Z2- Z1) (The pressure difference between two altitudese. . ) dp= -y dz (Change in pressure as it is related to change in weight. . .) y= (density) (g) 3. The attempt at a solution I'm very confused. . . I just need to understand the method of determining net head. Thank you in advance!