Breathable Sheet,” an air-permeable waterproof sheet, adopted for the first time in Japan for river restoration work

(Tokyo Head Office: Setagaya-ku, Tokyo; Osaka Head Office: Yodogawa-ku, Osaka; President: Yumi Nomura), a manufacturer of large membrane structures (tent structures), civil engineering and logistics materials, has installed Breathable Sheet, an air permeable waterproof sheet, in restoration work on the Ishizawa River in the Koyoshi River system under the jurisdiction of the Akita River and National Highway Office. The product is manufactured by the Japan Land and Infrastructure Conservation Organization (JLCO). The product was certified as “Category B” in the evaluation stage of “Technology for Tenacious River Levees” (the first public solicitation for technology) by the National Institute for Land and Infrastructure Management, which confirmed a certain level of performance against water overtopping, and was installed for the first time in Japan as a countermeasure against water overtopping.

Heavy rainfall in the Tohoku region from July 25, 2024 caused multiple levee failures in Yurihonjo City, Akita Prefecture. Breathable Sheet,” an economical and quick-restoration permeable waterproof sheet, was used to restore damage to the back slope of the levees (the side of the levees away from the river (residential and urban areas)).

Construction name: Ishizawa River Ayuse Area Disaster Restoration Levee Work
Location: Ayuse, Yurihonjo City, Akita Prefecture
Construction period: April 1, 2025 – January 27, 2026
Orderer: Akita Office of Rivers and National Highways, Ministry of Land, Infrastructure and Transport

It is a three-layer integrated sheet consisting of a permeable waterproof sheet with excellent waterproof and air permeability performance sandwiched between protective mats, which prevents rainwater and river water from infiltrating into the embankment and allows air permeability over the entire surface of the sheet. When the infiltration surface inside the embankment rises due to rising water, the pore air is quickly discharged, preventing the pore air pressure inside the embankment from rising, the air blow phenomenon, and damage to the embankment.

https://www.taiyokogyo.co.jp/products/10097/

In the “Technology for Tenacious River Levee Protection against Water Overtopping,” for which the National Institute for Land and Infrastructure Management invited applications from the public in March 2023, the breathable waterproof sheet “Breathable Sheet” was certified in the evaluation stage “Category B,” which recognizes its effectiveness and feasibility for practical application.
https://www. jice.or.jp/nebarizuyoi

[Reference: Past press releases related to this matter (our website)]
August 28, 2024 “Technology for Tenacious River Levees” public solicitation confirmed its effectiveness
https://www.taiyokogyo.co.jp/news/65066/

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