Abstract
This study aims to estimate the current status of the world water resources considering climate condition and socio-economic activity using the global in-land water cycle model. Hydrological simulations are conducted using land surface model (SiBUC) and river routing model (Kinematic-wave). With the ratio of accumulated value of water demand excess, water stress is evaluated globally with 20km resolution. On the other hand, ground water recharge amount is assumed to be a part of the base flow component of the land surface model. When groundwater withdrawal demand is continuously larger than groundwater recharge amount, groundwater storage change is always below zero, thus groundwater storage is decreasing year by year. Such area is regarded to be unsustainable groundwater use area.
