NUMBER hydraulic jump is classified as follows:1. Undular Jump: Froude number for this flow is between 1 to 1.7. Such a TYPE of jump is weak in nature and no significant water level rise is observed.2. Weak Jump: Froude number for this flow is between 1.7 to 2.5. These jumps are also natural jump and energy loss in these jumps is also less.3. OSCILLATING Jump: Froude number for this flow is between 2.5 to 4.5. It is oscillating in nature.So, Given FR = 4.2 LIES between 2.5 - 4.5. The jump is classified as Oscillating Jump4. Steady Jump: Froude number for this flow is between 4.5 to 9.5. Strong Jump: Froude number for this flow is greater than 9.0. Such jump is generally engineered for heavy losses.