For a Sustainable

Urban Water Cycle

For a Sustainable

Urban Water Cycle

Yuriko Koike

Governor of Tokyo

Yuriko Koike

Governor of Tokyo

Dialogue with the world’s leadersDialogue with the world’s leaders

Share policies and know-howShare policies and know-how

Water supports the cityWater supports the city

From Edo to TokyoFrom Edo to Tokyo

Courtesy of Postal Museum Japan

Densely populated megalopolis Tokyo

Densely populated megalopolis Tokyo

Tokyo

Tokyo Bay

Tokyo has various water restrictionsTokyo has various water restrictionsPrepared using Geospatial Information Authority of Japan (GSI) tile (Japan Landsat mosaic imagery）

Data sources: Landsat8 images (GSI, TSIC, GEO Grid/AIST), Landsat8 images (U.S. Geological Survey),Bathymetric charts (GEBCO)

Water is Tokyo’s prideWater is Tokyo’s pride

Global population increase and urbanization

1950 2017

Urban population over 50%

7.5 bil

2.5 bil

Usable water

Rivers/Lakes

97.47%

Glaciers

Oceans

2.52%

0.01%

Rain

River/Ocean

Water ReclamationCenter

Dam

Purification Plant

HouseholdSewerageWater Supply

River

Urban water cycle

Environment-related RiskFlooding

Environment-related RiskFlooding

2018 Heavy Rain in West Japan2018 Heavy Rain in West Japan

Cooperating to find solutions to environmental challenges

Cooperating to find solutions to environmental challenges

C40 Mayors SummitC40 Mayors Summit

Disaster-related RiskEarthquake

Disaster-related RiskEarthquake

Great Hanshin-Awaji EarthquakeGreat Hanshin-Awaji EarthquakePhoto courtesy of Kobe City

Disaster-related RiskEarthquake

Disaster-related RiskEarthquake

Great East Japan EarthquakeGreat East Japan EarthquakePhoto courtesy of Miyagi Prefecture Public Enterprise Bureau

Disaster-related RiskEarthquake

Disaster-related RiskEarthquake

Liquefaction after

the Great East Japan Earthquake

Liquefaction after

the Great East Japan Earthquake

‘MOTTAINAI’

差し替え予定

“People” and “Awareness”

Leak DetectionLeak Detection

Advanced Technologies and Skills

“ 3% ”

・Effective use of water resources

・Reduce CO2 emissions

Under construction After construction

Sewage Pipe Renewal methodSewage Pipe Renewal method

Advanced Technologies and Skills

Robust Systems

Infrastructure

Management

Infrastructure

Management

FIRSTUTOKYOURE

Safe City

DiversityDiverse City

Smart City

Three Cities to Create a New Tokyo

Smart City Initiatives Water Supply and Sewerage System

Olympic and Paralympic

Legacy

Smart Meter

Trial Project

Smart Meter+

Smart Grid

SMARTWATERSYSTEM

2022 2025

For a Smart Water System

Contributing to the World