Flooding from 24-28 September 2026 is estimated at about 25,000 million baht in economic damage, with Q3 GDP cut by 0.55%, Bangkok hit hardest. An economist warns a second upstream surge could add about 50,000 million baht in damage around Bangkok, mainly to factories, industrial estates and farms, depending on how well drainage works. Owners in flood-prone areas should check stock and equipment protection, rehearse evacuation and transport plans, and expect slower customer demand and possible delays in supplies. Flood risk is also raising concerns about foreign investment, so plan for a longer period of uncertainty.