The Brahmaputra is characterized by distinct seasonality and high variability of daily flow which is a remarkable feature of its flow regime. The highest recorded daily flow in the Brahmaputra at Bahadurabad was 1,05,249 cumecs in September 1998 over 41 years (1972-2012) which likely to be repeated once in about every 100 years and the lowest was 2,688 cumecs in April 2001 during the same period।