I’ve been surprised during my recent commutes to Yatsushiro at Kumamoto’s vast number of rivers, many of which I didn’t know existed. They fill with sediment, which must be removed or the rivers will overflow. There are few, narrow timespans during relatively dry periods when this is possible, and the engineers are out working like crazy from dawn to dusk to get it done. Pictured: a whole lotta sediment to remove. I have no idea what they do with it. - William https://kumanichi.com/articles/253846