Thesis Open Access

ASSESSMENT OF URBAN WATER SUPPLY AND DEMAND: THE CASE OF TARE TOWN

TEFERA MAMMO ZEWDIE

Thesis supervisor(s)

Brook Abate (PhD)

In this research Tare Town existing water supply, demand, and hydraulic performance of the
water supply system components were assessed. The main objective is to investigate the system
problems and supply and demand gap, and predict future water demand to provide clear
information that lead to remedial solution. Different empirical formulas, Water CAD
software and Microsoft excel sheet were used as tool to perform existing water supply, water
distribution system hydraulic performance and water demand analysis. The results of velocity
and pressure were used as tool to evaluate the hydraulic performance of water distribution
network by comparing it with standard maximum and minimum velocity and pressure of the
urban water supply distribution system; and demand and supply gap was used to evaluate water
shortage prevailing in the town. Water CAD analysis results showed violation of maximum and
minimum velocity and pressure requirements i.e. velocity in the system ranges from 3.43m/s to
6.4m/s which is very high beyond maximum and minimum limit and pressure at almost all
junction is negative which displayed the inefficient hydraulic performance of the existing water
distribution network. Along with this, the existing water supply and demand gap 7.94l/s or
685.5m3/d illustrated big water shortage in the town. The problems showed by the
analysis result were very little water supply source, old water supply system components,
existing water supply system covered only small part of the town, undersized pipes, small
capacity and low elevated storage facility and improper design of the whole system.
Moreover the water supply system has no independent administration and operation
institution. Therefore the new water supply system for the whole town should be designed
and constructed to satisfy the very high water demand of the town. Hence based on the
prediction of the future 20 years demand; source of minimum 36.58l/s should be supplied to
the town. In addition, pressure line for 36.58l/s and distribution pipe network for
73.16l/s that covers all the part of the town according to master plan, enough head and
discharge pumps for 36.58l/s that can make water reach the storage facility and 2,150m3
capacity-elevated tank that can supply water to all parts of the town should be designed
and constructed for the next 20 years. Furthermore independent institution that
comprises appropriate administrative and technical professionals has to be established.

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