A “Water Hammer” may be defined as an extreme fluid transient recognized by the loud bang, or hammering sound sometimes associated with piping accidents and fatalities. It may also evoke images of broken and bent piping, multi-million dollar damages, loss of water supply to cities, and death due to water-hammer related accidents. The primary purpose of this comprehensive text is to provide practicing engineers with the analytical tools required to identify water hammer concerns and to prevent equipment and environmental damage, personnel injuries and fatalities.