抄録
Whole of people living in KUMAMOTO area are using groundwater for drinking water. The amount of groundwater for drinking use is over 200 million cubic meter per year. Main recharging area of this groundwater bain is farm area which exists in middle SHIRA-River. But recently, groundwater level shows a yearly decrease. In this paper, the authors shows the change of groundwater level in KUMAMOTO groundwater basin and discuss the cause of this decrease of groundwater level. As the results, we show that decrease of groundwater level is mainly caused by decreasing of paddy field area. Moreover, we show the plan for recovering the groundwater and estimate the effect of this plan by field experiment.
