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Effects of Pipe’s Roughness and Reservoir Head Levels on Pressure Waves in Water Hammer Original Article, D6 Mansuri B., Salmasi F. and Oghati Bakhshayesh B Journal. Civil Eng. Urban. 4(1): 36-40. 2014 ABSTRACT:Water hammer is a transient flow in pipes that was created by suddenly change in velocity in pipes. This phenomenon can cause serious positive and negative pressures in pipes and often with several hazards in pipelines. Overall water hammer creates by closing valves rapidly, suddenly shut off or restarting pumps, and has one of most destructive hydrodynamic phenomena in pressurized pipelines. In this study, governing equations about water hammer is numerically solved by using MATLAB programing language, and then sensitivity analysis in pressure fluctuations has been investigated by changing some effective variables such as pipe roughness type and reservoir head. Numerical solution is based on characteristic lines method. Results show that with increasing in pipe roughness, negative and positive pressures ranges, decreased. Also increasing reservoir water level causes intensive negative and positive pressures in pipe. Keywords:Water hammers, Transient Flow, Pump, Positive and Negative Pressure, MATLAB منبع: [Hidden Content] دانلود: [Hidden Content].,14-06-36-40.pdf J. Civil Eng. Urban.,14-06-36-40.pdf