dc.description.abstract |
The objective of this study was to evaluate hydraulic and utility performance of water
distribution network of Ataye town by modeling and analyzing the existing water distribution
system. Water CAD software was used in evaluating the hydraulic performance of the water
distribution system. Steady state and extended period simulation analysis were carried out to
determine hydraulic parameters such as pressure and velocity. Utility performance was also
evaluated using international water association performance indicators. For conducting this
study, both primary and secondary data were collected and software such as water CAD V8i,
Auto cad civil3D, Arc GIS version10.4, and other like Geographic positioning system
Garmin72 and pressure gage were used. The simulated result for steady state analysis showed
that 25.89% of nodes operating under15mwc, 5.4% with pressure > 60 m and the remaining
68.71% for pressure value 15-60 m which is optimum adopted pressure. Only 7% of
distribution pipes have velocity 0.6-2 m/s and the remaining have <0.6 m/s velocity. For
extended period simulation 34.34% during maximum demand time and 16.86% during
minimum consumption hours have pressure <15m. 10.84% have negative pressure during
maximum demand hours which means around 4500 people are not getting water during this
time. Only 74.71% during minimum demand time and 65.06% during maximum
consumption hours that the distribution system performs within the optimum adopted
pressure. 14 nodes (8.43%) have pressure >60mwc which is maximum adopted pressure and
this caused water losses in the system. 23.47% of the systems have velocity 0.6 -2 m/s and
the remaining have velocity less than 0.6 m/s during high demand time. During low
consumption time, 100% the system velocity <0.6 m/s. Hydraulic performance of existing
system was evaluated by comparing model result hydraulic parameters (pressure and
velocity) with MWIE design guide lines. Based on the IWA performance indicators, water
utility of the town was evaluated and has low technical, financial, personnel and
environmental performance. Average per capital water consumption of Ataye town in 2020
was 23.18 l/c/d which is less than half of 50 l/c/d. Finally, the study tried to assess the
problems and extent of system disruption on water supply of Ataye town and provide locally
relevant recommendation to stakeholders that help to solve the problems |
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