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Sumida City is one of the 23 special wards of Tokyo, Japan with an estimated population of 240,000 as of 2008.
Rainwater museum in Sumida City.

Skywater Network launched in Sumida City, Japan

October 15, 2008

The Skywater Network was officially launched on 6 August 2008 at the 2008 Skywater Network Forum held in Sumida City (Tokyo, Japan) and over 250 participants gathered.

Members of the network

The Skywater Network provides a platform for administrations, cities, businesses and academia to share information and experiences about rainwater in order to form a mechanism of storage, infiltration and reuse of rainwater in Japan.

Rainwater collection for the past century

During the past quarter-century, Sumida City has been involved in reuse of rainwater. There are more than 140 rainwater storages in the city that can store 12,527 cubic meters rainwater, covering 106,774 square meters of area. Stocked rainwater is used for watering plants and flushing toilets. Storage of rainwater and infiltration of rainwater play an important role in adaptation to climate change. It can prevent flooding and address water shortages as well as promoting regeneration of urban water cycle.

Recognized leadership with ICLEI Local Initiative Award

Sumida Ward is Member of ICLEI and received an excellence award for rainwater utilization project from ICLEI for "Local Initiatives" in 2000.