Cleaning Moat Water Plant
@Moats are the most important fresh water habitat for wild life in Central Tokyo. However rainwater accounts for over 90 % of the moats water and because there is no natural flow in the moats, the quality has steadily deteriorated, and this is especially evident in summer.
@In 1995, then Environment Agency (now Environment Ministry) completed the construction of a large cleaning moat water plant close to the moats to help improve the water quality, and already significant improvements have been made in the water quality since the cleaning plant went into operation.