BANGKOK, Thailand – The Office of the National Water Resources (ONWR) has issued a warning to monitor high tidal conditions in the lower Chao Phraya River Basin, affecting seven provinces from December 18 to 28, 2025.
ONWR Deputy Secretary-General Paitoon Kengkarnchang stated that the Hydrographic Department’s forecasts predict significant sea-level rises in the Chao Phraya River, especially near Phra Chulachomklao Fort. The highest tides are expected between 5:00 a.m. and 12:00 p.m., with water levels reaching 1.70 to 2.00 metres above mean sea level, about 30 centimetres above the critical threshold.
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The rise in sea levels is due to high tides and the northeast monsoon, which may cause rivers to overflow into low-lying areas along the Chao Phraya, Tha Chin, and Mae Klong. At-risk areas include communities outside permanent flood embankments and those protected by temporary or incomplete barriers.
Provinces expected to be affected include Samut Prakan, Bangkok, Nonthaburi, Pathum Thani, Samut Sakhon, Nakhon Pathom, and Samut Songkhram.
The ONWR urges relevant agencies to monitor water conditions, inspect riverbank protection systems, reinforce vulnerable embankments, and communicate promptly with residents in at-risk areas. Agencies should also adjust reservoir, dam, and watergate operations as conditions change to reduce potential impacts. (NNT)
