Problem 7.4: Consider the pumped transmission line shown in Figure 7.91. A constant discharge of 5 lt/s is withdrawn from the system at point B. The head, Hp, added to the system by the pump is given by Hp = 70 - 6000Q2 where Q is in m³/s and Hp is in m. The city has (P.F.)day = 1.5, P1990-15400 and P2000-20800. Take -10 kN/m³, (P/Y)min-5 m, and (P/Y)max=80 m. Using the geometric extrapolation, determine: a) until when the municipal water requirements of this city will be supplied; b) the design head and power of the pump which has an efficiency, np, of 80%; (d Answer: a) 26 years after 2000 b)19.22 m and 22.1 kW 立 140 m 145 m 140 m izam (3) (b brit Smolder it not oldalievs (s 300ydi bunt fa To abreinsb srbbril (d L=2000 m 300 C L=2000 m A L=1000 m 115 m Pump bas $300 120 立 B f=0.016 for all pipes 5 lt/s D Figure 7.91 Transmission line for Problem 7.4. mura Dist. 210 City moldon't ilqua