A rectangular channel with a width of 2 m is carrying the discharge of 8 m3/s. A hydraulic jump is engineered in the channel to reduce the high energy of water by 0.2 m to protect the downstream structure. The post hydraulic jump depth for the structure is observed to be 1.8 meters. If the channel is horizontal and frictionless and the Froude number at the downstream of the flow is 0.6. The efficiency of the hydraulic jump (in percentage) is _____
1
86.2
2
63.3
3
78.4
4
98.2