"Department of Disaster Prevention and Mitigation (DDPM)" has issued an alert. It warns 10 provinces and Bangkok to monitor water levels in the "Chao Phraya River." Water levels are rising; officials are prepared to monitor continuously for 24 hours.
On 22 September 2026, Mr. Theeraphat Kachamat, Director-General of the Department of Disaster Prevention and Mitigation, stated that the DDPM, acting as the Central Disaster Prevention and Mitigation Operations Center (CDPMOC), received reports from the Royal Irrigation Department. Forecasts indicate that from days 1 to 9 ahead, on 29 September 2026 at station C.2 in Mueang Nakhon Sawan District, Nakhon Sawan Province, water flow will be approximately 1,400–1,450 cubic meters per second. Additional tributary flow is expected at 150–200 cubic meters per second, resulting in upstream water volume at the Chao Phraya Dam between 1,550 and 1,650 cubic meters per second, with irrigation intake on both sides at 400–450 cubic meters per second.
Given this situation, it is necessary to discharge water downstream from the Chao Phraya Dam at rates between 1,000 and 1,300 cubic meters per second. This will raise water levels by approximately 0.50–1.50 meters in low-lying areas outside flood barriers, including Sena, Phak Hai, Bang Ban, Phra Nakhon Si Ayutthaya, Bang Pa-in, and Bang Sai districts in Phra Nakhon Si Ayutthaya Province. However, this will not affect community areas protected by the flood barriers.
Therefore, the Central Disaster Prevention and Mitigation Operations Center has coordinated with 10 central provinces—Uthai Thani, Chainat, Sing Buri, Ang Thong, Suphan Buri, Phra Nakhon Si Ayutthaya, Lopburi, Pathum Thani, Nonthaburi, and Samut Prakan—as well as Bangkok. They have been urged to publicize warnings to relevant agencies, private sector businesses operating along the Chao Phraya River such as riverbank protection construction and riverside restaurants, and residents living along both banks of the Chao Phraya and Noi Rivers to closely monitor the water situation and prepare for potentially rising water levels.
If severe conditions are anticipated, provinces, local authorities, and relevant agencies should inspect flood barriers, prepare disaster response machinery, assign staff for continuous monitoring, and be ready to assist the public 24 hours a day.
Residents living in low-lying areas outside the flood barriers are advised to watch water levels and prepare to move belongings to higher ground for their safety.