This thesis focused on Evaluation of hydraulic performance in existing water distribution system, a case study on Bure town, Amhara Region, Ethiopia. The main objective of this study is to check the hydraulic performance of Bure town existing water distribution system by assessing demand, production of water and hydraulic parameter. Both, primary and secondary data sources were used for this study. Primary data was collected through field pressure measurement. The secondary data was collected from design document, annual reports and literature review. More over to analyze existing water distribution system, a model was examine by waterGEMv8i software. The analysis show that, the current total average day demand of the town was 1593 m3/day, water supply coverage was 79% and average per capital domestic water consumption was 36.6 L/c/day. The model calibration were water distribution system by pipe roughness was considered as the calibration parameter in this study and the data validation performance by using RMSE, MAE and R2 check accuracy were acceptable range. The model was used to identify higher and lower pressure at the junction and velocity through the pipes. A model simulation was performed for peak and low demand scenarios to analyze the distribution system. As a starting point, simulation results for different scenarios of maximum pressure, minimum pressure and velocity are used as a base tool to evaluate the hydraulic performance. Modeling results shows that for peak hour demand 63.56% pressure with permissible range and 36.44% pressure with not permissible range, for minimum day demand 88.74% pressure with permissible range and 11.26% pressure with not permissible range and velocity results indicated that loop system in this study the requirements pipes are fulfill. And also the result of practical observation analysis shows that study area topography was challenged in hydraulic performance of existing water distribution system, in the case of poor electrical power supply systems, the office technical experts cannot take immediate action during line burst and occurring leakage of pipes. Because of these reasons, the existing water distribution system of the town was not demand satisfaction. Therefore, to overcome these problems, pressure zone is provided to the existing distribution network, rehabilitation the existing water distribution system, must be construct additional electric power substation for increasing pumping hour of the pump, must to install stand by generator in the pump station which is used to during the failure of electric power to minimize interruption of water supply. Key words: Water distribution system, Hydraulic performance, Water demand, Water GEM vi8