BANGKOK – Heavy rainfall from the weakened Tropical Depression Kalmaegi has triggered widespread flooding across Central Thailand, with Bangkok and surrounding provinces facing rising water levels as of November 11th, 2025. The Thai Meteorological Department (TMD) reports that the storm, which made landfall in Vietnam before entering Thailand’s Northeast on November 7th, has brought isolated heavy to very heavy showers to the region, causing runoff from northern rivers into the Chao Phraya basin.
In Central Thailand, nine provinces—including Uthai Thani, Suphan Buri, and Ayutthaya—remain inundated, with floodwaters stable or rising in low-lying districts along major rivers. Satellite imagery from the Geo-Informatics and Space Technology Development Agency (GISTDA) confirms over 2.39 million rai of nationwide flooding since November 4th, affecting more than 704,000 people, 47,729 households, and 371,475 rai of rice fields. Ayutthaya alone accounts for 442,519 rai of submerged land, impacting 104 schools and three hospitals.
Bangkok has seen localized urban flooding, particularly in riverside areas of Nonthaburi and Pathum Thani, where Chao Phraya water levels have surged due to increased discharges from the Chao Phraya Dam—now at 2,700-2,800 cubic meters per second.
GISTDA’s risk maps highlight “missing-teeth zones” outside flood barriers in these areas as highly vulnerable, with potential overflows affecting an additional 350,000 rai if discharges continue. Bangkok Governor Chadchart Sittipunt has mobilized pumps and drainage teams, noting the city’s system can handle only 60mm of hourly rain, far below recent peaks of 131mm in districts like Lak Si. As of early November 11th, minor road flooding persists in outer Bangkok, but core areas remain protected by 88km of barriers.
The Department of Disaster Prevention and Mitigation (DDPM) has issued alerts for 66 provinces, urging evacuations from flood-prone zones. Reservoirs nationwide hold 90% capacity, prompting coordinated efforts with the Electricity Generating Authority of Thailand (EGAT) to manage flows.
Future Warnings: TMD forecasts scattered thundershowers with 60% coverage in Bangkok through November 12th, tapering thereafter as a new low-pressure cell from Typhoon Fung-wong approaches the South China Sea. However, high tides in the Gulf of Thailand—peaking around November 11th—could slow drainage until mid-week, raising flash flood risks in foothills and lowlands. Authorities warn of potential mudslides in 17 northern and northeastern provinces, advising residents to monitor levels via the DDPM hotline (1784).
Relief efforts include sandbag reinforcements along the Chao Phraya and aid distribution, with Deputy Prime Minister Thammanat Prompao stressing proactive measures to avoid a repeat of the 2011 deluge.
For the original version of this article, please visit The Pattaya News.
