Update on Pasak Chonlasit Dam water situation: all seven spillway gates have now been opened after water volume exceeded capacity due to continuous inflow. Preparations are in place to handle heavy rainfall from 3–6 Oct 2026.
On 30 September 2026, reports indicated that water levels at Pasak Chonlasit Dam in Phatthana Nikhom District, Lopburi Province, have risen beyond 100% capacity of the reservoir.
At noon today, the Pasak Chonlasit Dam Water Delivery and Maintenance Project opened all seven spillway gates for the first time this year to accelerate stepwise water discharge. Currently, the reservoir holds 930.78 million cubic meters, equivalent to 106.80% of normal storage capacity. Inflow exceeds 550 cubic meters per second (47.54 million cubic meters per day). Discharge has increased from 115.08 cubic meters per second this morning to 145 cubic meters per second now, with plans to further raise discharge daily to 400 cubic meters per second until 2 October 2026.
According to the Meteorological Department, a monsoon trough is expected to pass over the lower northern region, central region, and Lopburi Province from 3–6 October, causing heavy rainfall and additional inflow into the dam.
To control water levels within appropriate limits, the increased discharge is expected to raise Pasak River levels by approximately 1.00–1.50 meters. Areas requiring close monitoring include riverbanks downstream of Rama VI Dam, especially in Tha Ruea District, Phra Nakhon Si Ayutthaya Province.
Pasak Chonlasit Dam authorities urge residents living along the Pasak River and in vulnerable areas to closely follow water situation updates and official information, and to prepare for possible rising water levels.
The Royal Irrigation Office Region 10 and Pasak Chonlasit Dam management will continue monitoring rainfall and inflow, adjusting water management accordingly to prevent and mitigate impacts on local residents.