The Royal Irrigation Department is awaiting 1 billion baht in budget approval to repair a critical 14-kilometer stretch of damaged floodwall along Khlong Ror 1 in Songkhla province—infrastructure that has remained compromised for six months following catastrophic floods that cost the regional economy up to 25 billion baht.
Why This Matters
• Immediate risk: Residents in tambon Tha Chang of Bang Klam district face potential renewed flooding as the southern monsoon season—running May through November—has already begun.
• Scale of damage: Last November's floods left open holes in the concrete embankment after strong currents overwhelmed the canal designed to protect Hat Yai city.
• Budget bottleneck: Repair funds submitted to both current and previous governments remain unapproved, leaving vulnerable communities "living on the edge."
• Historical precedent: Hat Yai has experienced severe flooding in 2000, 2010, and most recently last November, with the latest event inundating 80% of the city.
Infrastructure Breakdown After November Deluge
Khlong Ror 1—officially named Khlong Bhuminartdhami—serves as Hat Yai's primary stormwater diversion artery. When torrential rains struck southern Thailand six months ago, accumulated rainfall exceeded totals from previous major flood events, generating water levels that reached one meter deep in front of residential properties and twice that depth behind them.
The force of the floodwaters damaged approximately 14 kilometers of embankment, with sections of the concrete wall collapsing entirely. The department's Songkhla project office conducted surveys along the full damaged stretch and submitted detailed repair estimates to government ministries. Officials have stated repairs will commence immediately once funding approval arrives, but as the wet season intensifies, that timeline grows increasingly urgent.
Beyond the canal infrastructure, the November floods wreaked havoc across Hat Yai's commercial core. Hundreds of hotels, businesses, and homes sustained damage, with the estimated cost to repair inundated residences within Hat Yai municipality alone reaching 1.2 billion baht—more than the floodwall repair budget itself.
Living With Flood Risk in a Climate-Changed South
Hat Yai's geographical reality makes it inherently vulnerable: the city sits in a low-lying floodplain surrounded by steep mountains that funnel runoff directly into urban areas. Rapid commercial expansion over recent decades has reduced natural drainage capacity, transforming what were once absorbent wetlands into a densely built basin with minimal ability to handle extreme rainfall.
Climate patterns have intensified this vulnerability. Last November's event was characterized by meteorologists as a "once in 300 years" rainfall intensity—a designation that reflects how profoundly climate change has altered precipitation patterns in the region. Infrastructure designed for historical rainfall averages simply cannot cope with the high-intensity storms that now regularly sweep across southern Thailand.
The Royal Irrigation Department faces a broader challenge across the country. In Nan province, the hydraulic control system at Nam Haeng reservoir sustained severe damage during Typhoon Wippha in July 2025, requiring urgent repairs during the 2026 budget cycle. In Chaiyaphum province, the Ban Non Muang weir collapsed during 2025 floods, received temporary repairs costing 2 million baht, then failed again in early 2026—now awaiting a complete reconstruction scheduled for completion in 2027.
These incidents underscore a national pattern: flood protection infrastructure built for historical climate conditions is being systematically overwhelmed by new weather realities, while budget cycles lag behind the urgent need for repairs and upgrades.
Government Response and Community Resilience Strategy
Following the November catastrophe, government agencies worked to disburse relief payments and home repair funds to affected households. Initial emergency payments were largely completed by early 2026, with an acceleration of home repair fund disbursements planned for March. Financial support measures included debt suspension for affected loans, social security compensation, death benefits, and specialized support for small and medium-sized enterprises (SMEs) whose operations were disrupted.
Hat Yai has simultaneously developed a more sophisticated approach to flood management, shifting from pure prevention to what officials call "learning to live with floods." The city has invested in an early warning system that utilizes real-time CCTV footage at critical junctions, broadcasting water level data, rainfall measurements, and satellite imagery through a popular website that local radio stations monitor for public alerts.
A Floods Working Group comprising representatives from city administration, at-risk communities, the business sector, academia, and NGOs coordinates integrated planning. This multi-stakeholder approach produced a Flood Risk Mitigation Handbook to guide decision-making, while a Climate Change Resilience Learning Centre facilitates education and coordination efforts.
Community-based preparedness has become central to the strategy. Projects engage residents in all stages of planning, providing education on climate implications and flood risks while helping neighborhoods develop customized flood plans in consultation with government agencies. Established evacuation centers provide designated safe zones when water levels rise.
What This Means for Residents
For those living along Khlong Ror 1 and in downstream areas of Hat Yai, the unrepaired floodwall represents a tangible threat during every heavy rainfall event through November. The damaged sections with open holes could allow canal water to pour directly into residential areas if water levels rise significantly—a scenario made more likely by the fact that the canal itself is compromised and cannot function at full capacity.
Residents should monitor the Thai Meteorological Department forecasts closely during this period and stay informed through Hat Yai's early warning system. The city's website broadcasts real-time water level data, which provides actionable information about rising flood risk hours before inundation typically occurs.
Property owners in flood-prone zones may want to review their insurance coverage, particularly given that previous flood damage estimates reached into the billions. Small business operators should develop contingency plans for inventory protection and operational continuity, as the November floods demonstrated how quickly commercial districts can become inaccessible.
Budget Politics and Infrastructure Timing
The 1 billion baht price tag for floodwall repairs reflects both the extensive damage and the engineering complexity of reconstructing concrete embankments along an active drainage canal. The Royal Irrigation Department submitted funding requests to multiple government administrations, suggesting the approval process has traversed political transitions—a common challenge for large infrastructure projects that require parliamentary budget allocations.
The timing creates particular frustration for affected communities: six months have elapsed since the damage occurred, yet the physical repairs have not begun. Meanwhile, the annual monsoon—the very condition that necessitates functional flood infrastructure—has returned on schedule. This gap between disaster, budget approval, and actual construction represents a vulnerability in Thailand's disaster response framework that extends well beyond Hat Yai.
Neighboring areas have implemented their own flood protection measures. In Bangkok, Thailand's Drainage Department received 2026 budget allocation to construct a 300-meter flood barrier along the Chao Phraya River at Roong Si community in Yan Nawa district, with construction scheduled to begin in March 2026 and require approximately 360 days. That project demonstrates how Bangkok's administrative resources can move more quickly on similar infrastructure—a disparity that highlights regional inequalities in disaster preparedness capacity.
The Broader Southern Thailand Context
Hat Yai's situation reflects challenges facing multiple urban centers across southern Thailand, where monsoon intensity has increased while drainage infrastructure ages. The city's role as a major economic hub for the region amplifies the consequences: when Hat Yai floods, supply chains, transportation networks, and cross-border commerce with Malaysia all experience disruption.
The 20 billion to 25 billion baht in economic losses from last November included not just direct property damage but cascading effects on tourism, retail, logistics, and services. Hotels that had weathered the pandemic faced rooms destroyed by floodwater. Restaurants lost equipment and inventory. Small manufacturers saw production lines submerged.
This economic vulnerability makes the unrepaired floodwall not just an infrastructure issue but a regional economic stability concern. Every day the damaged sections remain unrepaired, businesses and residents in the flood zone operate with heightened uncertainty about whether the next heavy rain will bring another catastrophic event.
As southern Thailand moves deeper into the 2026 monsoon season, the damaged floodwall along Khlong Ror 1 stands as a visible reminder of how climate change has outpaced infrastructure design, and how budget processes struggle to match the urgency of communities living in the path of increasingly extreme weather.
