The Nagoya High Court on Thursday rejected an appeal from people seeking to scrap Japan's largest dam, which is nearly completed after being on the drawing board for 49 years.

The high court supported a December 2003 district court ruling that rejected two lawsuits from area residents to stop construction of the Tokuyama Dam in Ibigawa, Gifu Prefecture.

In the two suits, filed in March 1999 and July 2001, the plaintiffs claimed the government's estimate for water demand in the area was inflated, and building the dam based on the state's estimate is unreasonable.