Parthenon underground(JP047)

Uptake in the basement a flood of small and medium-sized rivers was almost full , to flow through the Edogawa through the tunnel of 6.3 km total length underlie 50 meters underground , metropolitan area outer spillway is underground spillway of the world's largest . Mobilize the civil state-of-the-art technology that Japan is proud of to the world , completed in June 2006 . By Prior to completion , it runs partially from 2002 , to safely handle a flood of seven times every year , and has prevented氾Ran to residential areas , etc. .
Without being exposed to our eyes , the scale of a metropolitan area outer spillway to fight floods Guinness class exactly . And mammoth water tank , underground tunnel of 10 meters in diameter , including the huge pit of five spanning 30 m diameter to capture the flood , to 70 m depth , run over 6.3 kilometers deep in the ground , pillars of 500 tons weight towering also 59 book , it is the scale and 14000 horsepower turbine to drain the water of 200 cubic meters per second , all of which exceed the imagination .