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Shin-Yokohama Park and the Tsurumi River Multi-Use Retarding Basin

Publication date November 21, 2018 (Last updated January 9, 2020)
Sector Natural Disasters and Coastal Areas
Region name Kanto(Kanagawa Prefecture)

Climate change impacts

The highly urbanized Tsurumi River Basin has a class-1 river designation, and is susceptible to increased water hazards as a result of climate change.

Adaptation activity

The Shin-Yokohama Park, in the Tsurumi River basin, has been constructed within the Tsurumi River multi-use runoff retardation area. It is routinely used by many people as a park, but it also serves as a flood mitigation facility. The aim is to reduce downstream flood damage by diverting rising waters from the Tsurumi river and providing temporary containment. The Nissan Stadium in Shin-Yokohama Park is built on more than one thousand pillars, thus providing a flood water retention basin (Fig.).

Outputs / Expected benefits

The Tsurumi River multi-use retarding basin has been created where there were originally natural flood control functions; it artificially improves these functions to protect adjacent and downstream areas from flood hazards.

During the heavy rains caused by Typhoon No. 19 on October 12, 2019, the retardation area filled with approximately 940,000 cubic meters* of flood water. The water level at the recently installed Kamenoko Bridge hydrological station, reached 6.58 meters*. Without the retarding basin it is estimated that the water level would have been 0.3 meters (see Note) higher, exceeding the flood risk level. On October 13, the day after the typhoon, the final play-off game of the 2019 Rugby World Cup was successfully held at the Nissan Stadium.

Note: Preliminary estimates subject to change.

遊水地の仕組み(左:平常時、右:洪水時)
Fig. Retardation basin, (left) normal (right) flooded
(Prepared by National Institute for Environmental Studies, based on Keihin River Office map, Kanto Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism)
Sources and Related Information
Ministry of Land, Infrastructure, Transport and Tourism Kanto Regional Development Bureau Keihin River Office website "Tsurumi River Multi-Purpose Flooding Area Project"
https://www.ktr.mlit.go.jp/keihin/keihin00119.html
Tsurumi River Basin Water Council "Action Guidelines for Promotion of Global Warming Adaptation Measures"
https://www.ktr.mlit.go.jp/ktr_content/content/000638259.pdf
(Public Goods) Yokohama City Physical Education Association, "Multipurpose Flooding Basin Function of Shin-Yokohama Park"
https://www.nissan-stadium.jp/csr/safety03.php
Ministry of Land, Infrastructure, Transport and Tourism Kanto Regional Development Bureau Keihin River Office, Journal 16, 2019 (Wednesday) "Storing the flood of Typhoon No. 19 at Tsurumi River Multi-purpose Flood Place-Storing the third flood volume since the start of operation"