This paper briefly describes how to transport a vast amount of water as city-water to the seaside towns on the side of the Pacific Ocean from the Yakusima Island which is very much abundant in rainfall. The transportation method is as follows. Instead of using water tanker, submergible tank-barges which consist of a pontoon and a foldable cylindrical tank( dimension: D=50-60m, H=50-55m, vol.=100-150thousand m
3 ) made of synthetic resins or rubber are loaded with water at the Yakus i ma Island and submerged about 30m into the Kurosio, the Japan Current. And then, for about 10 days, it floats under the oceanic current to sea area nearby the Izu islands and rises to sea surface. Then the water is trasnf erred to a water tanker, which comes to a seaside town, Tokyo. The empty tank-barges are loaded on a submergible transport-barge under sea, which is tugged by a tugboat toward the Yaku s ima Island. Thus those empty tank-barges return home. This water transportation method can become an entire new system for water transportation using oceanic current. Three hundred thousand m
3 /day, equal to about one hundred million m
3 /year of water can be transported. This system has some effects of improving the city water quality and supporting city water quantity at dry weather and characterizes itself by being of environmental harmony and gentle to the Earth.
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