11. Undular hydraulic jumps have been observed with inflow / prejump Froude numbers up to 3.5 to 4. 12. There are two main manifestations of hydraulic jumps and historically different terminology has been used for each. 13. Figure 2 depicts a hydraulic jump . 14. These blocks help induce a hydraulic jump to establish subcritical flow conditions on the downstream side of the dam. 15. The other stationary hydraulic jump occurs when a rapid flow encounters a submerged object which throws the water upwards. 16. There will not, however, be a hydraulic jump in the situation where y 1 is equal to y c. 17. There are common hydraulic jumps that occur in everyday situations such as during the use of a household sink. 18. In the design of a spillway and apron, the engineers select the point at which a hydraulic jump will occur. 19. Examples of this include large changes in slope like a spillway, abrupt constriction / expansion of flow, or a hydraulic jump . 20. In general, a hydraulic jump may be used to dissipate energy, to mix chemicals, or to act as an aeration device.