4). Two reservoirs, A and B are connected with a long pipe which has the characteristics such that the head loss through the pipe through the pipe is given by hL=0.15Q2, where hL is in metres and Q is the flowrate in L/s. The water surface in reservoir B is 10.5m above that in reservoir A. Two identical pumps are available, each having the characteristics h=30+0.08Q0.055Q2 when operating at 1800rpm. Determine the achievable flowrate for (a). one pump operating at 1800rpm; (b). two pumps in series; (c). two pumps in parallel. [Ans. (a) 9.95L/s; (b) 14.11L/s; (c) 11.03L/s ]