Hydraulic Modeling and Improvement of Addis Ababa Water Supply System (The Case of Bole Bulbula)
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Date
2015-06
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Addis Ababa
Abstract
In this study, Addis Ababa Water distribution system for case study of Bole Bulbula supply system was assessed. The main objective of this study is to improve the Bole Bulbula water supply distribution system and control its operation, Water CAD software was used as tool to model water distribution system analysis. The modeling effort included both hydraulic and water quality modeling. Simulation results for maximum and minimum pressures were used as base tool to evaluate the hydraulic performance; and simulation result for water age and minimum residual chlorine were used as base to assess water quality transformation in distribution systems. Modeling results showed violation of maximum and minimum pressure requirements. Along with this, water quality simulation results illustrated water quality deterioration due to availability of minimum residual chlorine which is below WHO guideline.
The model analysis result shows the different problems of the system. These are aged pipes, oversized and undersized pipes, low and high pressures and water quality status. The system should be modified using the design criteria of velocity, pressure and residual chlorine. High pressures in the existing system caused by customers at too low demand have to be identified and solution is established using pressure-reducing valves. To retrieve the situation there is a need to intervene. Modification in operation and design will improve the current situation of the case study water distribution system.
Key Words: Water distribution system, modeling, Hydraulic performance, Water quality, Maximum pressure, Minimum pressure, Water age, Residual chlorine, Bole Bulbula, Addis Ababa.
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Keywords
Water distribution system, Modeling, Hydraulic performance, Water quality, Maximum pressure, Minimum pressure, Water age, Residual chlorine, Bole Bulbula, Addis Ababa