Water retained in Bhumibol and Sirikit dams, the nation's biggest reservoirs, is well below the 10-year average, said the Electricity Generating Authority of Thailand.
The agency warned that this could affect all activities that depend on water from the two reservoirs, either for agricultural or consumption purpose.
In a statement, it said that as of March 12, the water reserves in Bhumibol Dam reached 5,949 million cubic metres or 44 per cent of capacity. Of total, only 2,149 million cubic metres could be released for agricultural and consumption purposes.
Available water at Sirikit Dam was 1,807 million cubic metres.
Available water from the two dams totalled 3,956 million cubic metres. Though it 313 million cubic metres above the level in the same period last year, the level is 2,600 million cubic metres below the 10-year average, Egat said.
Egat Assistant Governor Natchaphon Phumwiangsri noted that the problem could get worse due to the cultivation of water-consuming plants as well as faster-than-expected intrusion of seawater in the Chao Phraya River. As tapwater production and irrigated areas could be affected, Bhumibol and Sirikit dams are asked to release more water to ease the salty water problem.