Frequency Analysis of Flash Floods for Establishing New Danger Levels for the Rivers in the Northeast <i>Haor</i> Region of Bangladesh

A danger level at a river location is the level above which a flood may cause loss and damage to nearby lives, crops, and homesteads. Currently, in Bangladesh, the danger level is designed and updated considering the riverine flood during the monsoon season (June–September). However, during the premonsoon season (March–May), flash floods, almost every year, damage crops in some parts of the northeast Haor (saucer- or bowl-shaped large tectonic depression) region. Damage to Boro rice, the only crop that is grown in this region, is catastrophic to the local population and threatens the food security of the country. At present, there is no warning or danger level to inform the community to save the Boro crops from flash floods in…