Chiang Mai's flood plan has changed after the 2024 floods. Authorities now forecast water levels 9-12 hours ahead with over 90% accuracy, and a new Flood Hazard Map, published since May, simulates how the Ping River's rising levels will flood specific areas and depths. For a business in a high-risk zone, this means planning evacuation of staff, stock and vehicles around that window. Vulnerable people are being moved first, before power is cut and rescue becomes dangerous. Check whether your premises sit in the mapped flood zone.