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Water hammer phenomenon is usually happened in water distribution networks due to pumps power failure or sudden closure, opening valves which lead to generate massive positive and negative pressures that may be catastrophic. In this research Bentley HAMMER Vi 8 is used to study the effect of roughness coefficient on water hammer wave in pipes. There are different methods to control and reduce these transient effects such as surge tanks, air vessels and pressure reducing valves. Choosing one of these methods depends on the design criteria, location and topography that strongly affect the