Hydraulic Evaluation of Water Supply Distribution System: The Case of Shire Endasilase Town, Tigray Regional State, Ethiopia

Water distribution system was designed to fulfill all requirements of different water demands. The main objective of this study was to evaluate the existing water supply distribution network performance to be satisfying customers’ basic need. The existing water distribution system was evaluated by filling current estimated base demand in each nodes of the model. In the water distribution system the model simulated and field measured pressures were calibrated in nine sample field nodes. The sample pressure at selected nodes has been measured using an instrument device pressure gauge in the low, medium and high pressures in the distribution system areas. The model performance observed and simulated plot relationship measures were checked based on the coefficient of determination (R ² ).The model of existing water supply distribution network system as well as the simulation results for maximum and minimum pressures and velocities were the main variables used to evaluate the hydraulic situation in the system. The output of this model were analyzed at peak and minimum consumption hours and performed for the water pressures and flow velocities in descriptive measure of statistics. The model simulation result of the existing system about 5.7% junctions were failed to satisfy the allowable pressure and with regarding velocity about 20.1% were out of the permissible range during the peak consumption hour. The main issues of the existing water supply distribution system were done using the Darwin Designer Water GEMS V8i tool. The hydraulic evaluation of water distribution system was carried out by considering the system as a continuous supply system. The system modified simulation results showed the maximum and minimum pressures as well as maximum and minimum velocities were fulfilling the permissible value ranges in the whole distribution system.