(Consider the following set-up: A pump on the upper floor of a building sucks water up from a tank in the basement. What is the maximum height that water can be drawn by the pump?) However, we are going to assume that instead of a wide tube used for drawing the fluid up the pipe, we have a very narrow tube of some internal radius r. In that case, viscous effects will make the maximum height even less, and the maximum height will depend upon the desired flow rate. The water is slowly filling the basement at a volume flow rate of Q, and the pump must draw the water out at that rate. In that case, what is the maximum height the pump can draw water?