Biological Diversity Brought on by Pollution Control

Watarase Retarding Basin

In Wakkanai Port, located in the northernmost part of Japan, there is a breakwater with an unusual shape. The huge reinforced concrete structure, measuring 427 meters in length, consists of 70 lined pillars supporting a semi-circular arched shelter. Built in 1936, the structure was ingeniously designed to deal with the intense winds and waves of the far north, which would be too much for a normal vertical breakwater. Despite a plan to demolish the structure, which had significantly deteriorated due to salt damage, the breakwater was faithfully restored in 1980 following a public outcry to preserve the structure.

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  • Watarase Retarding Basin

    Tochigi, Oyama, and Nogi, Tochigi Prefecture

    Itakura, Gunma Prefecture

    Kazo, Saitama Prefecture

    Koga, Ibaraki Prefecture

    1930

    https://watarase.or.jp/

    Courtesy of Tonegawa Jyoryu River Office, Kanto Regional Development Bureau Ministry of Land, Infrastructure, Transport and Tourism

  • Watarase Retarding Basin

    Tochigi, Oyama, and Nogi, Tochigi Prefecture

    Itakura, Gunma Prefecture

    Kazo, Saitama Prefecture

    Koga, Ibaraki Prefecture

    1930

    https://watarase.or.jp/

    Courtesy of Tonegawa Jyoryu River Office, Kanto Regional Development Bureau Ministry of Land, Infrastructure, Transport and Tourism