Heavy rainfall and upstream mountain runoff from India have pushed the Teesta River above its danger level at the Dalia point in Dimla, Nilphamari, on August 6. The Dalia Water Development Board said water was flowing 13 centimetres above the danger mark in the morning. Low-lying areas of Nilphamari and Lalmonirhat have begun to flood, raising fears among residents of river chars.

Nilphamari recorded average rainfall of 132 millimetres for the day, while 44 sluice gates were opened. Floodwater has entered low-lying parts of several unions in Dimla and Jaldhaka upazilas. Riverbank areas in Lalmonirhat also face the prospect of short-term flooding. Roads and cropland in char areas have started to go underwater, making boats and rafts the main means of travel in many places.

Residents said several days of heavy rainfall upstream in India, combined with continuous local rain over the past two days, worsened conditions. Flood-control embankments and elevated riverside roads are under pressure, with locals expressing concern over their durability because of inadequate repairs. Executive engineer Amitabh Chowdhury urged people living along the river and in char areas to remain alert.