The Social Experiment Programme in the Yamato-gawa River basin this year is called'Implementation Month'because the event period was extended from one week until last year to one month this year. Major results announced in the River Office website were:
(1) Participation rate was 39.7%, slight increase from last year, which means 850 thousands citizens in the river basin have participated in the event this year, 2011.
(2) BOD concentration decreased at eight monitoring points in 10 monitoring points.
(3) BOD load at the nearest monitoring point to the river mouth decreased 14%.
Slight increase of the participation rate and BOD load decrease near the river mouth showed increase the effects of the Social Experiment Programme or Implementation Month.