ONWR projects 38-day Bang Pakong drainage into mid-November
Bang Pakong holds about 2.105 billion cubic metres of floodwater, with the outlook dependent on no further rain and uninterrupted drainage.
- The National Water Command Centre (ONWR) estimates a 38-day drainage period for the Bang Pakong River Basin, projecting a return to normal conditions around November 13.
- This projection is conditional on no additional rainfall and uninterrupted drainage operations.
- The current flooding is more extensive than the major floods of 2013, with a larger affected area of 1.61 million rai and higher peak water levels.
The National Water Command Centre estimates that floodwater in Thailand’s Bang Pakong River Basin could take about 38 days to drain, provided there is no further rain and drainage continues uninterrupted. The projection points to a return to normal conditions around November 13, 2026.
The National Water Command Centre, under the Office of the National Water Resources (ONWR), puts the volume of floodwater in the basin at approximately 2.105 billion cubic metres. The estimate indicates that affected areas face several more weeks of flooding even without additional rainfall.
Bang Pakong flooded area exceeds 2013 level
Satellite data from the Geo-Informatics and Space Technology Development Agency (GISTDA), presented by the National Water Command Centre, show that approximately 1.61 million rai in the Bang Pakong basin had been affected by flooding as of October 4, 2026.
The basin’s flooded area compares with approximately 1.55 million rai during the major floods of 2013, an increase of about 60,000 rai.
At Kgt.1 monitoring station in Mueang Prachin Buri district, the peak water level reached 4.93 metres this year, compared with 4.82 metres in 2013. The increase of 11 centimetres puts this year’s peak above the level recorded during the earlier floods.
The government comparison indicates a larger affected area this year, although water levels and the extent of flooding need to be assessed alongside other factors rather than treated as a complete measure of flood severity.
Lower Bang Pakong basin records 528,888 rai of flooding
National Water Command Centre figures recorded a cumulative flooded area of 528,888 rai in the lower Bang Pakong basin as of October 4, with Chachoengsao accounting for the largest share. The provincial breakdown was:
- Chachoengsao: 272,833 rai.
- Prachin Buri: 234,363 rai.
- Chonburi: 21,692 rai.
In Chachoengsao, Bang Nam Priao district recorded the largest flooded area, followed by Phanom Sarakham, Ratchasan, Mueang Chachoengsao, Bang Khla, Khlong Khuean, Ban Pho, Plaeng Yao and Sanam Chai Khet, according to the centre’s district breakdown.
Prachin Buri districts with extensive cumulative flooding included Ban Sang, Mueang Prachin Buri and Si Maha Phot. The centre’s figures also recorded 30,393 rai affected in Si Mahosot and 16,877 rai in Prachantakham.
In the Chonburi section of the lower Bang Pakong basin, flooding was recorded in Phanat Nikhom and Phan Thong districts.
Water levels and drainage in the Bang Pakong basin remain under close watch. The centre’s projected return to normal around November 13 remains conditional on no additional rain and uninterrupted drainage, rather than a guaranteed end date.
