Abstract
Global warming resulting from increasing concentrations of atmospheric carbon dioxide and other trace gases may alter various hydrologic process in drainage basins. Global warming effects on water resources may depend on characteristic of each region, precipitation and vegetation, etc. So present flow regime is compared in three basins, which are dominated by different major phenomena, rainy season (baiu), typhoon and snow accumulation and melt. On some scenarios, sensitivity of water resources is evaluated at each basin by an index of dam necessary capactiy to secure necessary flow at downstream point to examine global warming effects and the differences are compared in the three basins.
