Corporate / CSR

January 26, 2017


Takenaka Corp. Testing Urban Flood Risk Reduction Technology Using Planted Spaces

Keywords: Corporate Disaster Prevention / Reduction Resilience Water 

Photo: Rainscape

Takenaka Corporation, a leading Japanese construction company, announced on August 9, 2016, that it has launched a demonstration of its rain garden technology, named "Rainscape" (Japanese trademark pending), that can use planted spaces to infiltrate and store rainwater. The company has collected data on the water quality and the flow rate of rain fall using various materials as fillers to enhance the improvement of water quality. It now aims to improve the functions of storing rainwater and also removing phosphorus and nitrogen from the water.

In recent years, more urban areas have suffered flood disasters more frequently, mainly attributed to climate change or the growing rate of impervious area. .Against this backdrop, there are growing efforts to let rainwater percolate underground and prevent runoff into sewerage systems. One technology that can apply planting space to make up for part of conventional infrastructure, called a "rain garden," is attracting attention, although sufficient quantitative evaluation has not yet been conducted.

This technology is designed to play a key role not only as an "underground space" for absorbing and storing rainwater in times of heavy rain to prevent peak rainfall runoff, but also as an attractive planted space above ground. Moreover, efforts to promote the use of purified rainwater on site will contribute to enhance the value of facilities.

Takenaka Corp. says it will work on rainwater utilization engineering, which uses a rain garden design to purify rainwater collected from the roofs and exteriors of buildings, and promote its use onsite.


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