Mean annual discharge are computed from these data, and the results are presented in figures in GIF format. Monthly evaporation is calculated by atmospheric water balance using precipitation data from Legates digital data. Atmospheric vapor convergence are integrated from ECMWF 4 dimensional assimilation data. Please refer details on the coming manuscript of Global Atmospheric Water Balance and Runoff from Large River Basins, by Taikan OKI et al., in the Hydrological Processes, 9, 655-678, 1995. The atmospheric data used in below figures are updated from 1985-1988 to 1989-1992. File sizes are approximately 20KB each.