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Being raised as an advantage of an arch type dam is distribution of power. In order to eliminate terrible water pressure, the canyon incised deeply is used well, it is made a convex type arch to a flow, and the mountain by the side of the base rock of the portion of the both ends of an arch is also made to catch water pressure. It seems that there is also little amount of the concrete used, ends, and has an advantage which the time necessary for completion can also do short while distributing water pressure and making it catch. However, in order to make an arch type dam, the water pressure is caught also on a mountain and the firm base rock supporting a bank is needed for it. Moreover, calculation also with a precise design is needed. Although there is a gravity type dam which opposes water pressure with the dignity of the concrete itself besides an arch type dam, In needing most quantity of concrete, in order to oppose water pressure here by own prudence, It seems that height is not made high so much or it is not fit for having raised pondage enough. Probably, the Dashidaira dam in Kurobe Gorge etc. is this system. |