| River Grading | Explanation |
| Grade I | No rapids and smooth flowing water (more to flat water) |
| Grade II | Some rough water and the line is easy to see or pursue |
| Grade III | Very safe for larger rafts: kayakers and canoeist should have good rolling and self-rescue skills |
| Grade V | For experience paddlers: the route through the rapids may require quick maneuvering |
| Grade IV & VI | For advanced paddlers and team of experts: scouting the rapids may be required and there may be hidden hazards which require precise maneuvering and taking all safety precautions |