Chao Phraya River Rising, 10 Provinces and Bangkok on Flood Alert
Thailand's Disaster Prevention and Mitigation Department has warned that the Chao Phraya River will rise 30–40 centimeters in low-lying areas after the Chao Phraya Dam increases discharge to 700–1,000 cubic meters per second. The alert covers 10 central provinces and Bangkok, with authorities urging residents in flood-prone zones to move belongings to higher ground and monitor official channels. Emergency hotlines 1784 and Line @1784DDPM are available 24/7 for assistance.
On November 11, 2026, Niwat Phongsitthawa, Director-General of the Department of Disaster Prevention and Mitigation (DDPM), acting as director of the Central Disaster Prevention and Mitigation Operations Center, disclosed that the department has been monitoring weather conditions and assessing risk factors. The Royal Irrigation Department issued Warning No. 8 on the Chao Phraya basin situation, forecasting that over the next 1–9 days, on November 12 at Station C.2 in Mueang Nakhon Sawan District, Nakhon Sawan Province, peak water flow will reach approximately 1,000–1,125 cubic meters per second. Tributary inflows are estimated at 180–200 cubic meters per second, bringing total flow above the Chao Phraya Dam to between 1,180–1,325 cubic meters per second, while the irrigation system on both banks draws 400–500 cubic meters per second.
Given these conditions, it is necessary to discharge water through the dam tail at a rate of 700–1,000 cubic meters per second, which will raise water levels by an additional 0.30–0.40 meters in low-lying areas outside the embankments in the following districts of Phra Nakhon Si Ayutthaya Province: Sena, Phak Hai, Bang Ban, Phra Nakhon Si Ayutthaya, Bang Pa-in, and Bang Sai — with no impact expected on community areas.
The Central Disaster Prevention and Mitigation Operations Center has coordinated with 10 central provinces: Uthai Thani, Chai Nat, Sing Buri, Ang Thong, Suphan Buri, Phra Nakhon Si Ayutthaya, Lop Buri, Pathum Thani, Nonthaburi, and Samut Prakan, as well as Bangkok. Public warnings have been issued to relevant agencies, private businesses operating on the Chao Phraya River — such as flood-prevention weir construction projects and riverside restaurants — and residents living along both banks of the Chao Phraya and Noi rivers, urging them to monitor water conditions closely and prepare for potentially rising water levels.
Should the situation worsen in any area, provinces are instructed to coordinate with local authorities and relevant agencies to inspect embankments, ready disaster-response equipment and machinery, maintain 24-hour staff monitoring and standby operations, and disseminate public awareness through all available channels.
The public is advised to follow official news and warnings closely, prepare for flooding — especially those in low-lying areas outside embankments — and move belongings to higher ground away from flood paths. Anyone affected by the disaster can request assistance via the DDPM Line channel "DDPM 1784" (Line ID @1784DDPM) or the 1784 hotline, available 24 hours a day.
