Tadashi HIBINO, Tetsuhiro FUJIWARA, Kazufumi TADA, Yasuo NAKAGAWA The organic sediment moves with water flowing in estuary. It is carried to the river with flood tide, and settles on the riverbed at a tidal flat. If the purification ability of the organic sediment is small, the sludging of the tidal flat is accelerated. The organic sediment settled there causes the environment deterioration and loss of waterside scene value. The environmental quality improvement technology using waste recycling

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... products is proposed. The large pore drain is embedded in the consolidated sediment. It can cause the water movement in the drain with the ebb and flood tide, and the water movement raises living thing habitation environment by supplying oxygen into consolidated sediment.