Browsing by Author "MESFIN GIZAW LEMMA"

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    MODELING OF WATER DISTRIBUTION NETWORK USING WaterGEMS CONNECT: THE CASE OF AREKA TOWN, ETHIOPIA
    (Hawassa University, 2021-10-26) MESFIN GIZAW LEMMA
    Safe and adequate delivery of water to a consumption node is an essential function of water distribution network. However, throughout the world especially in developing countries, the hydraulic performance of water distribution network is inadequate to transfer available water to a consumption node. Areka Town has been experienced frequent and regular disruption of water because of hydraulic problems related to pressure and velocity during high consumption period and at night time. The main aim of this study was to model the existing water distribution system for steady-state and extended period simulation and evaluating hydraulic performance of the system. For conducting this study, both primary and secondary data were collected and tools such as WaterGEMS, ArcGIS 10.3, and GPS were used. The total average per capita consumption of the Town in the year 2020 was 11.74 l/c/d which showed lower performance compared to 60 l/c/d which is set by GTP-II of the country for category 3 town and 108,808m3/year (27.35%) of water is considered to be non-revenue (NRW) and the apparent losses and real losses of the town was 0.9% and 26.44% respectively. There is high gap between demand and supply in the town because the current (2020) and the future (2042) maximum day water demand of the town was 2,395.92 m3/day and 14,116.88 m3/day respectively and the current (2020) water production of the town was only 1090.13 m3/day which only satisfies 45.5% of the current demand (2020) and 7.7% of the future demand in year 2042. Therefore, securing additional water supplies becomes an essential issue to meet the current and future water demand of the town. The simulated result showed that 1.81% for pressure value (<15m), 34.56% for pressure value (15-70m) and 63.63% for pressure value (>70m) at peak consumption and the velocity of pipe flow showed that 90% (<0.6m/s),10% the range of (0.6-2m/s) at low consumption time and Velocity in distribution network was in recommended range in peak consumption time. The performance of the model was evaluated using model evaluation statistics. The value of the coefficient of determination (R2) for pressure calibration was 0.991. Finally, potential causes of water losses in the town water supply system were assessed, water losses reduction strategies are designed and the system pressure and velocity are adjusted