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Bibliography 193
(a) Find the required diameter of the force main PA, B
(d PA ), if the pressure at point A is not allowed to drop
below 370 kPa.
(b) Determine the required diameter of pipe BC, (d BC ), if the
maximum allowed head loss in the network ABC is 3‰. Reservoir A C
water level P Qc
(c) Calculate the actual residual pressures at points A and C. at 100.00m
5.13 In the water supply system shown in Fig. 5.24, water is 38 L/s
pumped from the ground reservoir to the Vi1lage ABCD (eleva- D
tion of 120.00 m) through the water main PA. The value of C
for all pipes is 100. A water meter located on pipe DC indicates 15 L/s
a flow of 20 L/s. The following network data are provided: Figure 5.24 Water System for Problem 5.13.
Pipe d (mm) L (m)
(a) Determine the flow in each pipe as well as the flow
PA 500 10,000
delivered to point C (Q c ).
AB 250 500
(b) Calculate the pumping head, if the residual pressure
AC 200 700
at point C is not to be less than 150 kPa.
AD 200 500
(c) Find the residual pressure at point C if a different
BC 250 1,000
pump is used, one that can deliver half the flow into
CD 150 1,000
the system at the same pumping head above.
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