Tshwane University of Technology Department of Civil Engineering WEN 201T: Water Engineering II Assignment Deadline: Wednesday 11 October 2017...

EXERCISE 1

Pipeline AD is connected to a transmission main with a guaranteed pressure of at least 45m.w.c. the following data is valid.

SECTION AB BC CD

Ground level (m.a.s.l) Node A = 0 Node B = 0 Node C =9 Node D = 2

Total number of dwellings along section 140 210 250

Section length (km) 5 8 12

Per capita water demand = 100l.p.c.d

Average occupancy per dwelling = 4 people

Fire fighting demand = 20 m3/hr

Minimum pressure requirement = 10 m.w.c. (above ground level)

Maximum hourly peaking factor = 2.4

Questions

i) What is the most favourable location for the fire fighting demand?

ii) Calculate the design flow rates in the various distribution sections

iii) Calculate the maximum pressure loss over distance AD

iv) Calculate the maximum pressure gradient over AD

v) If the water temperature = 10oC, k = 0.5 mm, select the pipe diameter for the sections AB, BC and CD.

vi) Determine the pressures of the water in the pipe at points B, C and D.

vii) Plot the pressure line from A to D relative to the ground