Evaluation of Hydraulic performance of Gravity Water Supply System (The Case of Likimse-Abela Water Supply System)
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Date
2017-12
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Addis Ababa University
Abstract
Water supply distribution network components needs to design carefully because of cost involved and
its life time required to serve. However, in many of the developing countries, like ours the hydraulic
and physical performance of water distribution network is inadequate to meet consumers’
satisfaction on water supply and losses in system. Likimse-Abela, gravitational water supply system
in Wolayta Zone, Humbo Woreda has been experiencing disruption and uneven distribution of water
supplies for days to a week. This study was conducted in Likimse-Abela, to evaluate hydraulic
performance of existing water supply distribution system of the rural PAs. Both primary and
secondary data sources were used in this study. Primary data were collected though Key informant
interview and focus group discussion with Likimse-Abela Committee members, Woreda Water and
Irrigation office experts, field observations, photographs of relevant sites and infrastructures were
taken. For secondary data collection, documents review was used to collect valuable information. To
analyze the data which is collected from different sources, both qualitative and quantitative methods
was used. The computer software application that is excel was used to analyze the data obtained
from office. The field survey data for distribution system was evaluated by using the engineering
software called EPANET-2. As per the analyzed results; the current average per capita demand of
the area was estimated 11.62lit/cap/day however, enough of water flowing from the source to the
system and low system efficiency were observed to satisfy the user community. According to
simulated results; the maximum of 191.8m and minimum of -73.99m water pressure were examined
in the transmission and distribution main, respectively. Further, the analyzed water losses result in
Likimse-Abela water supply system indicates that about 12.19% and 58.22% of production is Non-
Revenue Water both on the pressure main and distribution network. In general, weak connection,
failure in gate valves and taps, small capacities of night storage reservoir and large volume of water
loss were leads the point to work unevenly. Hence, few years after most of residences were not
satisfied to the service of the system. Finally, it is recommended that the reduction of NRW, evenly
distribution and safeguarding resources through appropriate water demand management strategies
should be given priority. As a result, welfare of human being will be maintained holistically.
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Keywords
Hydraulic performance, level of service, EPANET, Likimse-Abela, Humbo and Wolayta