This issue of Hydrolink includes eight articles on different aspects of research and practice in hydraulic transients in urban and industrial systems. Hydraulic transients result from sudden changes in flow conditions in pipeline systems due to the planned or accidental closure/opening of valves or the starting/stopping of pumps or hydraulic turbines. These sudden changes can cause pressure waves through the system and pressure spikes generated by column separation and rejoining.

Guest editor: Hamid Bashiri. Bechtel, USA