The Royal Irrigation Department (RID) has warned people to stay alert as the Mae Klong Dam has released more water in Kanchanaburi.
The water level in the Tha Chin River and Kra Siao stream is expected to rise from today till Saturday, it said.
Irrigation Office 13 warned those living along the Mae Klong River in Ratchaburi and Samut Songkhram provinces to keep monitoring rising water levels.
The level in the Mae Klong River was measured at 2.9-3 metres above mean sea level with strong currents. Also, the high tide in the Gulf of Thailand in Samut Songkhram will increase the water level in the Mae Klong River.
Heavy rains upstream of the Tha Chin River have caused high water levels in Kra Siao stream, which is now holding 104% of its normal water-storage capacity.
The RID has diverted the water from the river to Nakhon Pathom province.
In Ubon Ratchathani, 19 districts have been inundated with over 46,000 people affected by the floods.
The floods have caused damage worth 5 billion baht. Locals say this year's floods are worse than in 2019.
Flood victims in Ayutthaya's Bang Ban district pleaded for help from the King after living in inundated areas for two months, with water levels now reportedly higher than during the great flood of 2011.