Interpretation of Flood Hazard Frequency for the Project Upazilas according to Map
(Source: BARC)
Based on the Flood Hazard Frequency Map of Bangladesh, the selected project areas fall within high hazard-prone regions. Riverine upazilas (Islampur, Dewanganj, Chilmari, and Kurigram Sadar) exhibit very high annual flood recurrence, with large portions classified under >50% flood frequency. Conversely, coastal upazilas (Koyra, Dacope, Kaliganj, and Shyamnagar) show mixed tidal flood classes, with many unions under 20–50% flood frequency due to storm surge and drainage congestion. The southeastern hill districts (Chakaria and Teknaf) reflect moderate flood frequency, influenced predominantly by flash floods and monsoon rainfall.
