HYDRAULIC ANALYSIS OF POTABLE WATER SUPPLY SYSTEM OF LEKU TOWN: IN SIDAMA NATIONAL REGIONAL STATE

Abstract

In this study, Focus on Analyzing Hydraulic performance of water distribution system and Water supply coverage, for case study of Leku Town supply system has been assessed. The main objective of this study is to assess water supply coverage and determine the hydraulic performance of Leku Town water supply distribution system. Water CADv8i software used as tools to model water distribution system to evaluate hydraulic performance of water distribution system. The modeling effort included both hydraulic performance of existing and newly proposed distribution system. Simulation results for maximum and minimum pressures and velocity of distribution system were used as base tool to evaluate the hydraulic performance. Performance analysis of water supply distribution system includes efficiency of distribution systems, especially maximum and minimum pressure and velocity requirements, reservoir capacity, water loss etc, have been evaluated with WHO guideline and Ethiopia water supply standards. The adjusted domestic water demand at the end of the design periods, 2033 & 2043, is found to be in the order of 1,207 m3/day and 1,609 m3/day, respectively with considering the socio-economic and climatic adjustment factors. Water supply coverage was 65.6% in year 2020 G.C. The average per-capita water consumption was 13.11 l/c/day for year 2020 G.C. The result indicates that per-capita water consumption of Leku town was below the standard. Water loss of the town was range between 15% and 25% from the beginning up to the final design year. The hydraulic performance of water supply system was evaluated the operation of distribution network with reference to minimum and maximum pressure and velocity of junction and pipe respectively. The existing water supply distribution system 78.5% of the nodes were within recommended range between (15m to 70m). Whereas; the matter of concern of velocity shows that, 79% of the pipes in existing water supply distribution system were within recommended range velocity between minimum 0.6 m/s to maximum 2 m/s velocities. The analysis result indicates that the hydraulic performance of existing water supply distribution system of Leku town was poor performance, not permissible range and also there was low water supply coverage as well. Therefore; the existing water supply distribution system has low pressure throughout distribution system due to the topography of the area. The velocities in the water distribution system were extremely poor and cannot satisfy the demand of the community. So that; water distribution system need to improve hydraulic performance through redesigning the system