In CMIP5, strong model consistency on changes in high and low streamflows is seen with similar global patterns to the mean flows, but over smaller areas . By the end of the 21st century, with RCP8.5, increases in mean, high and low flows are projected for the Lena, and mean and low flows for the Mackenzie . Increased mean and high flows are projected in the Ganges, high flow in the Rhine and Mississippi, while decreasing mean and low flows are projected in the Rhine . Decreases in mean, high and low flows are projected for the Tagus . Low flows are projected to decrease in the Mediterranean region and increase in the Alps and northern Europe . A general shift in the runoff distribution towards more extreme low runoff is projected in Mexico, western USA, western Europe, southeastern China and the West Siberian Plain, and more extreme high runoff is projected in Alaska, northern Canada and large parts of Asia .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report