dam
The dam (Dam) and dams (dams) are civil engineering structures created by traversing rivers and valleys or surrounding hollows, for the purposes of flood control, water use, landscaping, erosion control, waste disposal, etc. In general, it refers to artifacts built by concrete, earth and sand, rocks, etc. There are beavers as animals that make dams, and also called natural dams formed by damming rivers by landslides and landslides. Also, there are things that dams are not only on the ground but also a subsurface dam that damages the underground water line. Besides this, it is sometimes used conceptually to imply storage and saving, there is the word green damp that refers to the water holding capacity of the forest. Also referred to as weirs (cisterns, cisterns), in this case for purposes such as water intake and water level adjustment, those for sabo purpose are not included. For details about Japan's dam see Japanese dam. ...