Due to the severity of the disaster, flood control measures along rivers in Northern Kyushu were fundamentally revised, with many of the changes still in place.

Meanwhile from the south, the Pacific High in the area around the Philippines began to grow in strength and push the rain front into the Tsushima Strait.

Working in tandem these meteorological conditions generated the cloudbursts and prolonged rain that led to the unprecedented amount of precipitation over northern Kyushu.

Mount Aso, one of the largest active volcanoes in the world, has produced throughout the surrounding area a lava cap of andesite which is poorly permeable to water.

The river is important to industry, with twenty electrical power plants located along its banks, as well as the major city of Kurume in Fukuoka Prefecture.

The 5th Yoshida Cabinet (Government) placed "Nishinihon (West Japan) flood countermeasure center" in Fukuoka City.

In 2009, the countermeasures were again under review in view of the global warming and heat island phenomenon and the outbreaks of heavy rainfall in Northern Kyushu in 2009.