Governance of Underground Water

Governance of Underground Water

The Kumamoto region has benefited from abundant groundwater, which covers almost 100% of the total water supply. This was made possible mainly by the three following factors: 1) a large groundwater basin of approximately 600 km2,  2) easy infiltration and huge storage of rainwater due to unique soils layers developed by volcanic activities, and 3) relatively higher annual rainfall. However, the amount of groundwater has decreased in recent years due large part to increasing water consumption and lowering rainfall infiltration caused by urbanization. To manage and conserve groundwater resources in a sustainable manner, the group of more than ten municipalities in the basin developed a comprehensive plan to control groundwater. Also, a foundation sponsored by governments, companies, and residents financially supports various projects and research activities for groundwater conservation.