Royal Irrigation Department Accelerates Chao Phraya Basin Drainage
- Thailand is proactively preparing for potential heavy rainfall and flooding in the lower Chao Phraya River basin in November 2025.
- To mitigate the risk, a collaborative effort involving the Royal Irrigation Department, the Department of Disaster Prevention and Mitigation, the Naval Dockyard Department, and the Water Resources Data...
- the Royal Irrigation Department is also accelerating drainage through existing pumping stations located along seaside canals, directing water towards the Gulf of Thailand.
“`html
Thailand Prepares for Potential Flooding in Chao Phraya River Basin in November 2025
Table of Contents
Thailand is proactively preparing for potential heavy rainfall and flooding in the lower Chao Phraya River basin in November 2025. Forecasts predict significant precipitation, perhaps exacerbating conditions in areas previously affected by flooding. This is compounded by anticipated high sea levels between November 6th and 10th,2025,which are expected to slow drainage into the Gulf of Thailand.
To mitigate the risk, a collaborative effort involving the Royal Irrigation Department, the Department of Disaster Prevention and Mitigation, the Naval Dockyard Department, and the Water Resources Data Institute (Public Organization) has identified ten strategic locations for the deployment of “water pushing boats.” These boats will be positioned along the east and west sides of the lower Chao Phraya River basin, at the river mouth, and along major canals to accelerate water drainage into the sea.
drainage Enhancement Measures
the Royal Irrigation Department is also accelerating drainage through existing pumping stations located along seaside canals, directing water towards the Gulf of Thailand. This effort aims to lower water levels in vulnerable areas. The approach emphasizes systematic water management, adapting to current conditions and future trends, with daily drainage plans adjusted based on rainfall and runoff volume to minimize impact on the population.
Understanding the Risks: Rainfall, Sea Levels, and Drainage
The confluence of factors - heavy rainfall during the monsoon season and elevated sea levels – presents a significant challenge to drainage in the Chao Phraya River basin. High sea levels create a “backwater effect,” hindering the natural outflow of river water into the Gulf of Thailand. This effect is particularly pronounced in the lower reaches of the river and within canals connected to the sea.
The Chao Phraya River is Thailand’s most important river, vital for agriculture, transportation, and water supply. Flooding in the basin has historically caused significant economic damage and displacement of communities. The 2011 floods, for example, caused widespread devastation and billions of dollars in losses. The world Bank estimated the 2011 floods caused $45 billion