Towards improving the water quality of the moat in the outer gardens of the Imperial Palace
attempt

#SmartCity

#Urban Civil Engineering

#Redevelopment/Development

#Facility MEP Engineering

#Environmental planning/environmental management

Mitsubishi Jisho Design Smart City TOP

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Construction of moat water storage and purification facility for the new Otemon Tower / ENEOS Building construction project

Data

Project name	Construction of moat water storage and purification facility for the new Otemon Tower / ENEOS Building construction project
Year of completion	2015
location	1-chome Otemachi, Chiyoda-ku, Tokyo
Uses	Water purification facility (B1F-B2F) Storage tank (B3F to B5F)
Processing capacity	3,000㎥/⽇
Storage volume	3,000㎥
Maximum Depth	35m (storage tank depth 17.5m)
remarks	Pipes under the road are laid using the jacking method (φ800)

This facility combines a moat water purification facility and storage tank in the basement of a private building, takes in moat water from the adjacent Ote moat, purifies and stores it on-site, and then discharges the treated water into the Ote moat, thereby ensuring the circulating purification of moat water and temporary storage.
Taking advantage of the location characteristics of a privately owned building redevelopment district adjacent to the Ote moat, construction was carried out with a moat water purification facility and storage tank installed in the basement of a private building.
When laying the intake and discharge pipes under the road, permission to occupy the road was obtained and construction was carried out using the jacking method.

In recent years, natural disasters caused by climate change have become more frequent, and people are becoming more environmentally conscious. When purchasing an apartment or residential land in a new town, environmental friendliness will become a brand value added, and as ESG investment expands, the weight of environmental friendliness in corporate value is expected to grow.
The subject of this case study is the moat of the Imperial Palace Outer Gardens, an iconic body of water in the capital of Tokyo that attracts many tourists from both within Japan and overseas. However, in the past, there were concerns about the deterioration of the water quality, which led to a decline in its aesthetic appearance and foul odors.

Therefore, through public-private partnerships, purification facilities and storage tanks were installed within the private development plan area, and facilities were established that contribute to securing water volume and improving water quality. In addition, the facilities are designed to make effective use of rainwater and be used for disaster prevention in the event of a disaster, with the aim of utilizing them in ways other than just improving water quality.

Furthermore, it is important that such environmental improvement efforts are not only carried out by certain businesses, but also widely publicized to spread the efforts. In this case, the purification facility was set up as a tour facility, making it possible to explain the social significance and purification mechanism in an easy-to-understand way. In this way, by combining not only environmental consideration through water quality improvement, but also disaster prevention use in the event of a disaster and publicizing the efforts, we believe that we can contribute to creating a more attractive town.