In most parts of the upper Ganges and Brahmaputra rivers, the 50- year return level flood is likely to increase and to a lesser degree in Indus River. Similarly, the extreme precipitation events are also expected to increase to a higher degree in the Indus than the Ganges and Brahmaputra basins . Increase in extreme precipitation events is likely to cause more flash-flood events in the future . In the case of the Indus, increasing temperature trend in the future may lead to accelerated snow and ice melting which may increase the frequency and intensity of floods in the downstream areas . The Ganges-Brahmaputra region also faces the threat of increased frequency of flood events . Additionally, the Ganges basin also shows a higher sensitivity to changes in temperature and precipitation .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report