Assessment of The Hydraulic Performance of Existing Water Supply Distribution System: A Case Study on Finote-Selam Town, Amhara Region, Ethiopia
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Date
2019-05
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Addis Ababa University
Abstract
This thesis focused on assessment of the hydraulic performance of existing water distribution system: a
case study on Finote-Selam town, Amhara region, Ethiopia. The main objective of this study is to check
the hydraulic performance of Finote-Selam town water distribution system by assessing demand and
production of water, losses of water, hydraulic parameter.
Both secondary and primary data sources were used for this study. Primary data was collected through a
face-to-face interview, field survey, and photographs of relevant sites and infrastructures. The secondary
data was collected from design document, literatures, journals and reports. Moreover, to analyze existing
water distribution system a model was developed by using Water CAD software. The model can be used
to identify the zone of higher and lower pressure junctions and velocity though the pipe. The model
simulation run was performed for peak and low demand scenarios to analyze the distribution system. For
calibration of water distribution system, pipe roughness was considered as the primary calibration
parameter in this study.
The analysis shows that the current total domestic water demand in town was 1536.75m
3
/day, the water
supply coverage was 82.4 % and average per capital domestic water consumption was 37.9 l/c/day.
Hence, this result indicates there is a gap between demand and supply. The water loss of the town was
32.18% from the total water production. The apparent loss covers 9.18% while, the real losses covers
23% of the total losses. Simulation results for maximum and minimum pressure and velocity different
scenarios were used as a base tool to evaluate the hydraulic performance. Modeling results showed
violation of maximum and minimum pressure and velocity criteria at different junctions and pipes. After
modifying the existing water distribution system 92.18% of the junctions are in the recommended
pressure range and 75.46% of the pipes are in the recommended velocity range.
Generally the result of the analysis shows that the overall hydraulic performance of water distribution of
the town was poor, which is reflected by low water production rate, low water consumption, and high
level of Non-revenue water, low service coverage, not velocity and pressure in permissible range.
Therefore, it is significant to rehabilitate and improve the water distribution system capacities,
establishing pressure zone, increase pumping rate and drilling additional borehole. In addition providing
more attention to water losses reduction policies and strategies are vital for remedial measures.
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Keywords
Water demand, Hydraulic performance, Simulation, Water distribution system, water losses