The link between rainfall and flooding is complex. While observed increases in extreme precipitation have increased the frequency and magnitude of pluvial floods and river floods in some regions, floods could decrease in some regions due to other factors. These factors could include soil wetness condition, cryospheric change, land cover change and river system management, adaptation measures or water usage within the river basin . For example, in the USA and Europe, a study indicated that major  floods did not show significant long-term trends . Nevertheless, anthropogenic climate change increased the likelihood of a number of major heavy precipitation events and floods that resulted in disastrous impacts in southern and eastern Asia, Europe, North America and South America  . Davenport et al.  demonstrated that anthropogenic changes in precipitation extremes had contributed one third of the cost of flood damages  in the USA. Anthropogenic climate change has altered 64%  of floods events with significant losses and damages during 2010-2013 . Gudmundsson et al.  attributed observed change in extreme river flow trends to anthropogenic climate change . Although there is growing evidence on the effects of anthropogenic climate change on each event, given the relatively poor regional coverage and high model uncertainty, there is low confidence in the attribution of human- induced climate change to flood change on the global scale.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report