Lake Biwa is the largest Lake in Japan and presently supplies some 14 million people in Keihanshin metropolitan area with drinking water, making it the single most important source of water in Japan. In order to prevent the water pollution and the advance of eutrophication of Lake Biwa, soap promotion movement had been promoted from the second half of the 1960s in the Lake Biwa region. Furthermore, many citizens and residents organizations aiming at environmental conservation have been established by present. In the Lake Biwa Comprehensive Conservation Plan (LBCCP, Mother Lake 21 Plan, 2000- ), the environmental conservation at the river-basin level is promoted. Therefore, this study aims at viewing typical examples of environmental partnership activities at the river-basin level, after surveying about the present condition of the activities for environmental conservation in the Lake Biwa region.
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