Staff at the facility in Saitama, north of Tokyo, are on constant alert, especially during Japan's rainy and typhoon seasons from June to late October. "In this area, torrential rain, typhoons and even daily rainfall can cause damage by submerging houses and roads," the site's chief, Nobuyuki Akiyama, told AFP. The reservoir has helped reduce the number of homes affected by water damage in nearby areas by around 90 percent, he said.
AFP