Mr Jayaprakash was seen by some locals taking selfies with his mobile phone. The locals said he slipped and fell into the water.
His father filed a missing complaint with the police.
Valparai has been receiving incessant rains for the last six days.
In a similar incident, an Australian couple fell to their death from a wall overlooking a popular tourist beach in Portugal yesterday, apparently losing their balance after taking a selfie.
The obsession with selfies had cost a man his life in the national capital in March. A 22-year-old man was killed in North Delhi's Vijay Vihar when he was posing with a pistol in a room and the gun went off. The pistol was licensed and belonged to the victim.
With inputs from agencies