The Chao Phraya Dam on Wednesday increased its discharge rate, sending a huge volume of water downstream, where four villages in Bang Ban district of Ayutthaya were flooded.
Extra water is also being released from the Pasak Jolasid Dam, with flood warnings for five central provinces.
The Chao Phraya dam in Chai Nat province increased its discharge rate to 2,766 cubic metres of water per second, the highest rate this year.
Somyos Ketsuwan, chief of Bang Ban district, on Wednesday inspected flooding in areas in front of Wat Kopai in tamon Bang Luang Dod after Khlong Bang Luang canal overflowed and flooded four villages in the tambon.
A total of 162 households were affected, Mr Somyos said as he handed out relief bags to residents.
SUNTHON PONGPAO AND ONLINE REPORTERS