Question 3

A town's water system is connected to a supply reservoir, reservoir A, that feeds into the town

at a single junction J, as shown in the figure. The water is distributed to two key zones shown

as B and C on the figure. Nodes A, B and C are connected to the junction by pipes. The

water levels in A and Care, respectively, 300 m and 180 m AOD. Pipe lengths, diameters and

friction factors are given in the table below.

(a) What is the maximum water level that can be maintained at B to ensure that any flow is

form J to B?

A proposal to develop the town requires a new out-take to be provided from J to D. The design

discharge from J to D, measured directly at J, is 35 Ls¹. The water level in B is 250 m

(b) Discuss, with the appropriate evidence and supporting calculations, how this will impact

the existing system, and if zone B will still be provided with water from the supply reservoir.