Social and Environmental Initiatives 2012

Water Conservation

Improvement of Overall Water-Saving Performance

In the operations areas, efforts are being made for an overall improvement of water-saving performance, such as incorporating water-saving toilets that have an even higher water-saving performance than the previously used water-saving toilets (flushing water amount about 12-13L/time).

Efforts in Office Buildings (fiscal 2011)

A water-saving flush valve (flushing water amount about 6-10L/time) was incorporated in six newly constructed office buildings (including some property before completion), including “Onarimon M-SQUARE” (Minato-ku, Tokyo) and the “Hamarikyu Mitsui Building.”
A switch to water-saving toilets was performed at three existing office buildings as well.

Efforts in Retail Properties (fiscal 2011)

Water-saving toilets (flushing water amount about 5.5-8L/time) were incorporated at three newly built retail properties.
The three existing retail properties were switched to water-saving toilets (flushing water amount about 5.5L/time) and are together looking to save a total of 26,500m3 of water annually. Additionally, adjustments of the amount of water of the sink pipes were performed at the “Mitsui Outlet Park Sendai Port” (Sendai-shi, Miyagino-ku). As a result, it is looking to save a total of 2,200m3 of water annually.

Efforts in Hotels (fiscal 2011)

Water-saving taps were installed in the showers of all prefabricated baths in all guest rooms at Mitsui Garden Hotels’ two new facilities.

Use of Rainwater and Recycled Water

At “Mitsui Outlet Park Kurashiki,” a rainwater storage facility (capacity of 1,974 m3) was installed and is being used to irrigate plants.
At the six office buildings newly built in fiscal 2011 (partially including properties prior to completion), rainwater storage facilities and water recycling facilities were installed and the rainwater and recycled water is being used for toilet flushing and for irrigation of plants.

Status of use of rainwater and recycled water at newly built properties (fiscal 2011)

Category Facility name Location Content, scale Usage
Retail facility Mitsui Outlet Park Kurashiki Kurashiki-shi, Okayama Rainwater storage facility (capacity of 1,974 m3) Irrigation of plants
Office building Sapporo Mitsui JP Building Chuo-ku, Sapporo-shi Odd job water tank (capacity of 160 m3) Toilet flushing water
Muromachi East 2-3 Block Chuo-ku, Tokyo Recycled wastewater processing facility (Processing capacity 160 m3/day) Water for odd jobs
Hamarikyu Mitsui building Chuo-ku, Tokyo Rain water storage facility (capacity of 150 m3) Irrigation of plants
Yokohama Mitsui Building Nishi-ku, Yokohama-shi Rain water storage facility (capacity of 200 m3) Toilet flushing water
(Temporary name) Nihonbashi Honmachi Nichome Plan Chuo-ku, Tokyo Rainwater usage (rainwater filtering 7.6 m3/day), recycled water usage (processing capacity of 53.2 m3/day) Irrigation of plants and toilet flushing water
Shinbashi M-SQUARE Minato-ku, Tokyo Rainwater storage facility (capacity of 14.1 m3) General Service Water for times of disasters

Reinjection of Rainwater

Grass parking at Mitsui Outlet Park Kurashiki

Grass parking at
Mitsui Outlet Park Kurashiki

At “Mitsui Outlet Park Kurashiki,” 139 automobiles worth of grass parking were laid and rainwater naturally penetrates to underground.
Additionally, 1,000m2 of water permeable paving was laid in the outside facilities of “Hamarikyu Mitsui Building” and 400m2 in the outside facilities of “Goseimon M-Square” in an effort to reduce underground rainwater.

Providing Opportunities to Think About Water

At “Tokyo Midtown,” a “family water exploration tour” was held during a two day period in August 2011. Seven groups of 21 people participated, and with water as the theme, recycling rainwater and wastewater, water circulation of waterscapes and reducing heat loads by water films in top lights (passive design) were introduced.

Mitsui Fudosan Group Environment Communication Word Striving for Urban Development that Enriches Both People and the Earth

Related site

Environmental measures on the Tokyo Midtown On the Green What we do for the earth (PDF : 5MB)