National Water Resources Office Reports Usable Water Down to 39% Nationwide—Central and Eastern Regions in Critical Condition
Thailand's water reserves have dropped to critical levels, with usable water nationwide at just 39% capacity and the central region at only 32%, as the country braces for heavy rainfall and flooding risks through mid-May.
On May 15, 2569, the National Water Resources Office (NWRO) reported data as of May 14 showing total water volume across Thailand at 46,169 million cubic meters, with only 22,061 million cubic meters available for use—representing 39% capacity.
The central region has usable water reserves at just 32%, while the eastern region stands at 36%, both classified as critical levels. The western region maintains 66% and the southern region 61%, faring better by comparison. In the past 24 hours, Phang Nga Province recorded the heaviest rainfall at 154mm, followed by Chiang Rai at 96mm and Nakhon Phanom at 42mm.
Areas at risk of cumulative heavy rainfall over a three-day forecast period (May 14-16) exceeding 200mm include Amnat Charoen Province (Pathum Ratchawongsa and Mueang districts), Ubon Ratchathani Province (Kutkhaopun and Trakaerpheuchol districts), and Chiang Mai Province (Kalyaniwitthaya district).
Authorities urge residents in these areas to closely monitor weather forecasts and prepare for flash floods and flash flooding.
Hazard Warning Alert
The National Water Resources Office is issuing warnings for heavy rainfall areas from May 15-18 due to a low-pressure system over the Bay of Bengal combined with strengthening southwest monsoon winds, bringing increased rainfall across many Thai regions.
Particularly affected are the northern, northeastern, central, western, eastern, and southern regions. Residents should be alert to flooding, flash floods, mudslides, and impacts on agricultural areas, as well as disruptions to urban transportation.
Additionally, from May 17-21, warnings are in place for high tides in the Chao Phraya, Mae Klong, and Tachin river areas, which may cause water to overflow into low-lying areas along riverbanks, communities outside flood barriers, and certain transportation routes. Monitor for saltwater intrusion that could affect water quality for consumption and agricultural use in Bangkok and surrounding provinces, as well as nearby coastal areas.
