along with the likelihood of unforeseen increases in water scarcity that outpace the ability to prepare for the increased risk by putting in place new large-scale infrastructure within the required time scale. For those associated with extreme events, 'severe' refers to magnitude  and timing . Important water-related extreme events include river flooding caused by heavy and/or prolonged rainfall, glacial lake outburst floods, and droughts. For those impacting cultures, 'severe' refers to the loss of key aspects of traditional ways of life. This includes consequences of the above two KRs.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report