1. The problem statement, all variables and given/known data http://www.brighthubengineering.com...nnel-flow-basics-hydraulic-jump-calculations/ In th earlier part of this notes , i was told that the The hydraulic jump is an abrupt transition to subcritical from supercritical flow. but , in the diagram , we can see that the hydraulic jump occur when the water from the supercritical enter the subcritical region... 2. Relevant equations 3. The attempt at a solution which is correct ? I think the second part is correct because when the hydralic jump occur , it's usually when the high speed velocity water enter the slower one . In the region of hydraulic jump , the velocity of the subcritical region is lower .