1. The problem statement, all variables and given/known data You are required to pump water out of a very deep mine. Where should you put the pump? 2. Relevant equations P=P(surface)+rho(g)(h) 3. The attempt at a solution I am sure that this is a very easy problem but I can't see mathematically how to solve it. I know that if the resevoir of water at the bottom was under atmosperic pressure a suction pump could only raise the water about 10 meters and therefore not be useful. So, you would use a forcing pump below the column of water but how do I work out where exactly it goes?