Draft:Nakaura Water Gate

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Last edited by Spiderone (talk | contribs) 3 minutes ago. (Update)

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Nakaura Water Gate was a water gate that once straddled Ejima in Yatsuka Town, Yatsuka County , Shimane Prefecture (now Matsue City) and Sakaiminato City, Tottori Prefecture , and separated Lake Nakaumi and the Sakai Strait.

The Mitsui O.S.K. Lines Kaiji Nakaura Office was responsible for the operation of the floodgates. They were completed in 1974 at a cost of approximately 9 billion yen. When the Nakaumi and Shinjiko desalination projects were cancelled in 2002 , they were demolished, and the removal work began in 2005 and was completed in March 2009.

Overview

The total length of the gates is 414m. They consist of 10 two-stage roller gates (operated by two gates, upper and lower) and three lock gates installed in the center . The widths of the locks are 20m (Central Lock), 14m (West Lock), and 12m (East Lock). The upper part of the gates functioned as a road bridge, connecting Eshima (Shimane Prefecture side) and Sakaiminato (Tottori Prefecture side). The upper part of the gates also functioned as a drawbridge when ships passed through.

Purpose and use

Known as the "Showa era's Land Pulling ," it was constructed to prevent seawater from flowing upstream from the Sakai Channel and to desalinize Lake Nakaumi and Lake Shinjiko as part of the "National Lake Nakaumi Land Improvement Project," which involved creating approximately 2,230 hectares of farmland and other land and desalinating Lake Nakaumi to secure agricultural water for the reclaimed land and approximately 7,300 hectares of farmland around the coast .

In addition, the road bridge built over the sluice gates connects Eshima Island, which could only be crossed by boat, with Sakaiminato, and is used by approximately 14,000 vehicles daily. However, because the area over the sluice gates was built as a drawbridge, traffic was cut off for about 7 to 8 minutes when ships passed through, creating a traffic hindrance, and large vehicles weighing over 14 tons could not pass over.

Removal of the floodgate

Nakaura Water Gate was built with the aim of desalinating Lake Nakaumi and Lake Shinji, but in 1988 the desalination was postponed, and in August 2000 the large-scale land reclamation project that was planned in conjunction with the desalinization was cancelled. In 2002 the decision was also made to cancel the desalinization project, and Nakaura Water Gate became obsolete without having achieved its original purpose. Furthermore, in October 2004 , Eshima Ohashi Bridge was opened just north of the water gate to solve the traffic problems at Nakaura Water Gate , putting an end to its role as a road bridge as well.

Although there was a proposal to utilize the two-stage gate to improve the water quality of Lake Nakaumi, the decision was made to remove the gate due to the annual maintenance costs of several hundred million yen. Removal work began in October 2005 and was completed in March 2009 , when a closing ceremony for the Mitsui O.S.K. Lines Kaiji Nakaura Office was held. The total cost of the project, including the removal of other facilities, is estimated at approximately 9.4 billion yen.

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