Which sohai company orgnised at that location
Pls publish

Class I Rapids - Moving Water Over Shallow Riverbed
Class II Rapids - Waves that Make Fun Splashes
Class III Rapids - Fun Waves with Thrill Factor, Requiring Some Technical Skill
Class IV Rapids - Whitewater with Obstacles and More Technical Skills
Class V Rapids - Rapids with major Obstacles That are Difficult to Avoid
Class VI Rapids - Unnavigable Whitewater Rapids

those familiar with the rapids n rivers (esp this time of the year) ought to know how a Class II can anytime turn to a V or VI