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Purpose of this study is to identify the aquatic environment and method of mitigating the endangered species of aquatic plants such as Nuphar oguraense and Sparganium japonicum in the Okuda river. This study also try to propose the model of conserving two endangered species.A series of field survey has been carried out to find out the relation between water quality and habitat of aquatic plants. Questionnaires survey was carried out to identify the awareness and consensus of people living in the watershed. This study suggests the following two points.1) The endangered species of Sparganium japonicum can be found only in the area where groundwater springs flow out at the bottom of river channel.2) It is necessary to create the institutional framework of managing the biotope with two endangered species by the people living there.

Proposal of river Improvement plan of neo-natural considered conserveation of the endangered species (Nuphar oguraense and Sparganium japonicum)