Decharat, Chairman of the Water Situation Monitoring Task Force of the Prachachon Party, updated the latest flood situation: the eastern region remains worrying, water recedes slowly in Bangkok and its vicinity, while attention focuses on increased water discharge from the Chao Phraya and Mae Klong Rivers.
On 28 September 2026, Decharat Sukkamngern, Director of the Policy Center for the Future and Chairman of the Water Situation Monitoring Task Force of the Prachachon Party, updated the flood situation in four zones nationwide. He noted that the eastern region remains concerning, while water levels in Bangkok and its vicinity are receding slowly. The Chao Phraya River basin requires monitoring for increased discharge after the high tide period, and the Mae Klong basin is beginning to feel effects from heavy rain and dam releases.
In the eastern region, the situation remains worrisome due to ongoing rain. Several upper reservoirs must release water as they have reached full capacity or thresholds requiring discharge. This has caused water levels above one meter in several areas, with some locations still rising, including Chanthaburi, Rayong, Prachinburi, Chachoengsao, and Nakhon Nayok provinces. Notably, in Klaeng District, Rayong Province, the Khlong Rorok reservoir (Khao Chuk) poses a risk of dam breach. Authorities are urgently evacuating downstream residents and must promptly provide assistance.
In Bangkok and the surrounding metropolitan area, although rainfall has decreased, water levels are still receding slowly. Additionally, on 28-29 September, high tides are occurring, causing many communities to remain flooded with residents still trapped and needing urgent aid. Between approximately 11:00 a.m. and 4:00 p.m. today, the Chao Phraya River will be ebbing, marking a critical window to accelerate water drainage. If no heavy rain occurs, main roads are expected to reopen tomorrow, albeit slowly.
Decharat added that a major challenge now is the stagnant water remaining in communities and low-lying areas, requiring increased pumping and drainage capacity. Water should be moved continuously from streets and villages into pipe systems, minor canals, and main canals before flowing into the Chao Phraya River or the Gulf of Thailand. The goal is to clear stagnant water within one week.
In the Chao Phraya River basin, including Phra Nakhon Si Ayutthaya Province and central region areas, current discharge at the Chao Phraya dam in Chainat Province remains below 2,000 cubic meters per second, keeping floodwaters high. Water levels are mostly stable or slightly rising. Meanwhile, water levels upstream of the dam continue to increase. After the high tide period, the Royal Irrigation Department may need to increase discharge to approximately 2,100–2,200 cubic meters per second. At-risk areas should prepare accordingly, including advance evacuation plans if necessary.
Decharat also noted that assistance to residents in the Chao Phraya basin remains limited, despite these areas being among the first affected by flooding in this event. Thus, urgent relief efforts for those still impacted are necessary.
Finally, in the Mae Klong River basin covering Kanchanaburi, Ratchaburi, and Samut Songkhram provinces, flooding began yesterday due to heavy rain combined with dam discharges from two large dams exceeding storage limits. The situation divides into three areas:
1. Upstream areas including Sai Yok, Thong Pha Phum, and Si Sawat districts in Kanchanaburi Province currently face high floodwaters requiring urgent relief for residents.
2. Midstream areas at Mae Klong Dam in Tha Muang District have increased discharge to 1,386 cubic meters per second, expected to rise to 1,500 cubic meters per second today. This will impact low-lying banks in Kanchanaburi and Ratchaburi provinces, though most communities and commercial zones remain unaffected.
3. Downstream areas in Samut Songkhram Province will face combined effects of upstream water and high tides on 28-29 September, potentially causing flooding in markets and low-lying zones such as Maeklong Market.
Decharat emphasized that overall, the situation requires close monitoring—especially in the eastern region, which remains critical, as well as the Chao Phraya and Mae Klong basins where discharge volumes must be tracked. Although conditions in Bangkok and vicinity are improving, the priority remains accelerating water drainage from communities and low-lying areas as quickly as possible.
Finally, the Prachachon Party urges residents in vulnerable areas to closely follow the situation and official warnings, prepare evacuation plans in advance if needed, and seek assistance through the party's local teams when necessary.