Hey this problem of mine involves unsteady fluid flow (Q) into a cylinder of diameter (D). There is a small hole at the bottom of the cylinder of diameter (d) which is much smaller than (D) hence d << D. Because of this the fluid level will rise to a maximum height (h) before decreasing to zero over time. Please see diagram http://img407.imageshack.us/img407/8462/pic1ub8.th.jpg [Broken] How does the unsteady fluid flow relate to the height? As in is it possible to work out this maximum height that would occur? I'm so stuck on this! Could anyone point me in the right direction? I understand that the work will not be done for me but if you could point me in the right direction with equations to use I would be very greatful.