Villagers who have lived beside the Prasae River for more than 60 years say they have never seen water come into their houses like this. It arrived too fast for most of them to move anything.
The flooding began late on Sunday night, 27 September, when Prasae Reservoir in Rayong reached a critical level and water began pouring over its spillway. It ran down the Prasae River and spilled into homes and fruit orchards in Krasae Bon subdistrict, in the province’s Klaeng district.
The Krasae Bon Subdistrict Administrative Organization had already warned residents as the reservoir approached the spillway level, telling people in low-lying areas to move to higher ground.
A Sattahip disaster response team reached Village 4 at about 10.50pm. Rescuers went first to elderly residents and to anyone who had not been able to leave in time, carrying them out of their homes. Teams then lifted belongings to upper floors and stacked sandbags around houses while the current kept pushing through the village.
By 3.15am on Monday the water showed no sign of dropping. Officials said they would stay on site through the night.
On Monday morning the Royal Irrigation Department put the reservoir at 331 million cubic metres, or 112.6% of its capacity, in the eighth warning it has issued on the reservoir. About 24 million cubic metres a day is passing over the spillway into the river. In its 7am bulletin the department told people living along the river and in low ground across Klaeng to take maximum care.
The same rain has hit neighbouring Chon Buri. In Khao Mai Kaeo, a subdistrict of Banglamung, some residents are calling this the worst flooding in 30 years.
On Saturday Mayor Jamnian Keetheepakun, with deputy mayors Bancha Udong and Preecha Rengkhwanjai, led a team into Ban Phu Sai and Ban Thung Sa Kaeo with survival kits and household supplies. They went house to house in steady rain, surveying damage and taking down complaints. Households reported water in their homes and roads they could no longer use.
“Even with continuous rain today, we still had to go out and put aid directly into people’s hands,” Jamnian said. He said the municipality would consider further help under its own regulations.
Rayong and Chon Buri sit on the eastern seaboard, the stretch that carries much of Thailand’s industry and a large share of its tourism. Both provinces are on the Thai Meteorological Department’s heavy rain list for Monday.
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Sources
- The Pattaya News — Rayong flooding continues overnight
- The Pattaya News — Khao Mai Kaeo mayor leads aid delivery
- The Thaiger — อ่างเก็บน้ำประแสร์วิกฤตทะลัก 112%
⚠ Editor note — delete this whole box before publishing
Hand-filed draft, 28 Sept 2026, 12:00. Rayong and Khao Mai Kaeo detail from The Pattaya News; reservoir figures from the Royal Irrigation Department bulletin no. 8 as reported in our own Thai coverage. The “worst in 60 years” and “worst in 30 years” lines are residents’ own descriptions, not official records. Situation was still live at filing. No cover image yet.
The story Rayong hit by worst flooding in 60 years as seen on Thaiger News.
