PUBLISHED : 9 Nov 2025 at 16:08
A City Hall cleaner checks if garbage clogs the water drainage system on a flooded street in Samphanthawong district of Bangkok on Sunday. (Photo: Bangkok Metropolitan Administration)
The Geo-Informatics and Space Technology Development Agency (GISTDA) has warned that Bangkok and its neighbouring provinces — Pathum Thani and Nonthaburi — face heightened flood risks following increased water discharge from the Chao Phraya Barrage in Chai Nat.
The Royal Irrigation Department raised the discharge rate from 2,750 to 2,800 cubic metres per second on Sunday after heavy inflows from northern rivers caused by remnants of former Storm Kalmaegi.
GISTDA said the increased water discharge has pushed water levels higher along the Chao Phraya River and its trib…
PUBLISHED : 9 Nov 2025 at 16:08
A City Hall cleaner checks if garbage clogs the water drainage system on a flooded street in Samphanthawong district of Bangkok on Sunday. (Photo: Bangkok Metropolitan Administration)
The Geo-Informatics and Space Technology Development Agency (GISTDA) has warned that Bangkok and its neighbouring provinces — Pathum Thani and Nonthaburi — face heightened flood risks following increased water discharge from the Chao Phraya Barrage in Chai Nat.
The Royal Irrigation Department raised the discharge rate from 2,750 to 2,800 cubic metres per second on Sunday after heavy inflows from northern rivers caused by remnants of former Storm Kalmaegi.
GISTDA said the increased water discharge has pushed water levels higher along the Chao Phraya River and its tributaries, raising the risk of overflow and flooding in nearby areas. High sea tides are another factor directly affecting the riverside zones in Greater Bangkok, making water drainage more difficult during this period.
It said low-lying riverside areas in the three provinces are most at risk — particularly those outside flood barriers, known as the “missing-teeth zones”. The agency’s map shows areas shaded orange at risk of flooding if the discharge remains at 2,700 cubic metres per second, while red zones would be affected if the rate continues at 2,800 cubic metres per second.
In Pathum Thani, flood-prone zones line both banks of the Chao Phraya river from Sam Khok to Muang district.
In Nonthaburi, the most vulnerable areas are in Pak Kret and Bang Kruai districts.
In Bangkok, areas located close to the Chao Phraya River — including Bang Phlat, Bangkok Noi, Bangkok Yai and Thon Buri — must continue to monitor the situation closely.
GISTDA noted that most of the above risk areas are outside the city’s flood barriers.
Authorities are closely monitoring the situation and have urged residents living near the river — especially in orange and red zones — to move belongings to higher ground and follow updates from official agencies.
GISTDA said it continues to track the situation via satellite imagery to help relevant agencies plan mitigation measures and coordinate a timely response.