Chadchart Orders All Agencies to Prepare for Rainbomb if Heavy Downpours Last 3 Hours
Bangkok Governor Chadchart Sittipunt has ordered all city agencies to prepare for severe "rainbomb" flooding from heavy downpours lasting three hours, while dismissing immediate threats from sea-level rise and river overflow over the next f
On May 5, 2025, at Bangkok City Hall, Bangkok Governor Chadchart Sittipunt addressed online speculation about Bangkok flooding in 2030 due to global warming and rising sea levels, as well as claims that Bangkok subsides 2-3 centimeters annually. He questioned where floodwaters would originate, noting that if flooding came from the Chao Phraya River, Bangkok already has protective embankments measuring 2.80-3.5 meters in height along both banks, spanning approximately 88 kilometers. Regarding tidal surge over 4-5 years, there may be minor flooding at vulnerable points, but no sudden water rise in the short term. Chadchart stated Bangkok ranks 9th globally for climate risk, a long-term concern requiring government-wide planning across provinces bordering the Chao Phraya River, including Samut Prakan, Samut Sakhon, and Samut Songkhram. The immediate concern is rainbombs, which the city has analyzed for 300mm rainfall in 3 hours. He ordered all agencies to prepare for this more likely scenario. Current land subsidence in Bangkok is relatively low due to reduced groundwater extraction. Sea level rise from global warming is gradual, not sudden, and the 4-year assessment may be overly cautious. Bangkok's embankments are built 50cm-1 meter higher than normal, with additional water gates planned along canals as secondary defenses. Based on analysis, significant flooding is not expected within 4 years but is a long-term concern.
