AUGUST 26, 2019 THE COUNCIL ON …The Tokyo 2020 Olympic and Paralympic Games will be held in 2020....

AUGUST 26, 2019

THE COUNCIL ON METROPOLITAN WATER RESOURCES MANAGEMENT

FOR TOKYO 2020 OLYMPIC AND PARALYMPIC GAMES

THE COUNCIL MEMBERSKANTO REGIONAL DEVELOPMENT BUREAU (MLIT), KANTO BUREAU OF ECONOMY, TRADE AND INDUSTRY (METI), KANTO REGIONAL AGRICULTURAL ADMINISTRATION OFFICE (MAFF), JAPAN

WATER AGENCY, TOKYO METROPOLIS, CHIBA PREFECTURE, SAITAMA PREFECTURE, IBARAKI

PREFECTURE, GUNMA PREFECTURE, TOCHIGI PREFECTURE

BACKGROUND AND OUTLINE OF THE ACTION PLAN

OUTLINE OF THE ACTION PLAN Regarding countermeasures to secure water resources, the effect is expected to increase by about 20% in the

flood season and the non-flood season to the maximum of the total water use capacity of dams of the Tone River.

Regarding countermeasures to ensure continuous water supply, each prefecture will provide publicity on water conservation, request cooperation for water conservation, and each prefecture will receive water from water supply companies nationwide when water outages occur.

The implementation status of the action plan will be confirmed, and this action plan will be reviewed as necessary. In addition, appropriate management of facilities such as dams will be implemented appropriately, and thorough countermeasures against terrorism will be implemented.

BACKGROUND

The Tokyo 2020 Olympic and Paralympic Games will be held in 2020. In the summer of 1964, just before the last Tokyo Olympic Games, the water supply was limited to a maximum of 50%, and water was cut off in the daytime.At present, in addition to the Tama River as a water resource of Tokyo, 2 river basins, the Tone River and the Arakawa River, are added, and Yamba Dam will be completed in 2020.The total water capacity of reservoirs in the metropolitan area is 4.5 times that of the time during the flood season, 1,245 million m3, and is 5.1 times that of the non-flood season, which was 1,691 million m3. However, due to the extreme heat and light rain in recent years, water shortages with restrictions on water intake had occurred in the Tone River and the Arakawa River, which are the main water resources in the Tokyo metropolitan area.

To promote more effective and systematic use of limited water resources and to ensure a stable supply of water even when there is a danger of water shortage, The Council on Metropolitan Water Resources Management for Tokyo 2020 Olympic and Paralympic Games was established, and the Metropolitan Water Resources Management Action Plan for Tokyo 2020 Olympic and Paralympic Games was formulated.

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THE METROPOLITAN WATER RESOURCES MANAGEMENT ACTION PLAN


Countermeasures before

Olympic game

(Before June 2020)

Countermeasures to be taken if there is a risk of water shortage or water shortage occurs

(July 2020 - September 2020)

Phase Phase I Phase II Phase III Phase IV Phase V

Water Resources

Condition

Implementation /

preparation stage before

the Games

Water shortage is

foreseenWater shortage

Serious water

shortage

Very serious water

shortage

Water resourcesSecurityActions

Wide area cooperation

Tone River

&Arakawa

River

TamaRiver

Sagami River

TIMELINE OF WATER RESOURCES SECURITY ACTIONS

Operation of Yamba Dam started

Prepare for flexible dam management during flood season

Request for utilization of power generation capacity

for city water

(Yagisawa Dam)

Operational enhancement of downstream water transfer facilities of the Tone River

Operational enhancement of water utilization advanced facilities of the Arakawa River

Commissioning of artificial rainfall equipment

Operation of raw water in the Tama River using raw water connection pipe according to water shortage situation

Operation of artificial rainfall equipment according to water shortage conditions

Cooperation between the Sagami River water and the Sakawa River utilizing raw water connection pipe

Postponement of maintenance and repair work for dams with construction restriction water levels

Raw water operation to secure water storage

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Olympic game July 22, 2020-August 9, 2020Paralympic game August 25,2020 – September 6, 2020

Change of drying time at WataraseReservoir



Flexible dam management during flood season

Prepare for flexible dam management during flood season

Flexible dam management during flood season

Information sharing and review / coordination of countermeasures in the framework of the council




Olympic game

(Before June 2020)




Water Resources

Condition

Implementation / preparation

stage before the GamesWater shortage is foreseen Water shortage Serious water shortage Very serious water shortage

Continuouswater supply securityActions

Wide area cooperation

Tokyo

Chiba

Saitama

Information sharing and review / coordination of countermeasures in the framework of the council

Observe dam water storage, collect and share information

Preparation and implementation of decompression water supply for tap water (* as necessary)

Establishment of water shortage prevention task force

Sharing information with the Japan Water Works Association / water supply support from water utilities across the country as needed (cooperation with the Japan Water Works Association)

Public relations about water saving

Request for water-saving cooperation

Request for water supply restriction to fountains, etc.

Request to stop fountains, etc.






Agricultural water use in rotation (* as necessary)







Request for self-restraint or cancellation of fountains, etc.

TIMELINE OF CONTINUOUS WATER SUPPLY SECURITY ACTIONS (1/2)

Request for restriction or suspension of fountains, etc.

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Olympic game

(Before June 2020)




Water Resources

Condition

Implementation / preparation stage

before the GamesWater shortage is foreseen Water shortage Serious water shortage Very serious water shortage

Continuouswater supply securityactions

Kanagawa

Ibaraki

Gunma

Tochigi














Request for restriction or suspension of fountains, etc.


Preparation and implementation of decompression water supply for tap water (* as

necessary)





* The action plan of each prefecture summarizes the measures to be implemented according to the status of the water resources owned by each prefecture.* In addition, necessary measures are considered and implemented according to the water source and water intake status.

TIMELINE OF CONTINUOUS WATER SUPPLY SECURITY ACTIONS (2/2)


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FLEXIBLE DAM MANAGEMENT DURING FLOOD SEASON For flood control dams, the flood control capacity is emptied in advance during the flood season. At the flood

season, flood control is carried out using this empty capacity. In flexible dam management, water is stored in a part of the flood control capacity, which is normally empty,

to the extent that flood control is not hindered. As a result, it can be used for preserving the river environment and replenishing the flow rate for maintaining the normal function of flowing water at the time of abnormal water shortage.

The additional water stored by this flexible dam management will be used for water supply.

WATER RESOURCES SECURITY ACTION (1)

Flexible dam operation

Flood seasonNon-flood season Non-flood season

Water use

capacity

▼Full water level

Flood season

control level

Flood control

capacity

Sediment storage capacity

Flexible operation

Water use capacity


Additional water use capacity

▼ Full water level

Flood season

control level

Flood control

capacity

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Dam location map(as of August 26, 2019)

Kawamata damKawaji dam

Ikari dam

Kusaki dam

Sonohara dam

Shimokubo dam

Takizawa damArakawa reservoir

Miyagase dam



OPERATION OF YAMBA DAM STARTED Yamba Dam, currently under construction, is expected to be completed by the end of March 2020. After completion, the newly stored water can be utilized for 90 million m3 during the non-flood season

(October 6 to June 30) and 25 million m3 for the flooding season (July 1 to October 5).


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Photos of Yamba damPhoto above taken on July 1, 2019

Photo below taken on June 27, 2019

Yamba dam storage capacity allocation

＊Water use capacity is the capacity to store water used for domestic water, industrial

water, agricultural water, power generation, etc.

Flood seasonNon-flood season

Water use capacity


▼常時満水位

Flood season

control level

Flood control capacity

65,000,000m3 90,000,000m3

25,000,000m3

90,000,000m3

(Feb.1 – June 30) (July 1 – Oct.5) (Oct.6 – Dec.31)

Non-flood season

▼Full water level



OPERATIONAL ENHANCEMENT OF DOWNSTREAM WATER TRANSFER FACILITIES OF TONE RIVER Prior to the water supply from the dams upstream of the Tone River, the water transfer facilities downstream of the

Tone River, such as the Kita-Chiba water transfer channel, will be utilized. In this way, water collected at Lake Kasumigaura and the lower part of the Tone River will be supplied to the Edo River, thereby preserving the water storage capacity of the upstream dams

In 2020, by increasing the number of operating days and the amount of water supply, the supply from dams will be reduced and the amount of reservoir water will be preserved.


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Without operation of Kita-Chiba water transfer channel

Reduction of water storage Secure water storage

Water level drops significantlyWater supply

Limit water supply

Small drop in water level

With operation of Kita-Chiba water transfer channel

Dams of upstream Dams of upstream



OPERATIONAL ENHANCEMENT OF WATER UTILIZATION ADVANCED FACILITY OF ARAKAWA RIVER

By using purified water from sewage treatment water as part of the maintenance flow of the Arakawa River, the amount of supply from dams will be reduced.

In 2020, by increasing the number of facility operation days, the supply from dams will be reduced and the amount of dam water stored will be secured.


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Without operation of the water utilization

advanced facility

maintenance flow

5m3/s

Summer：3m3/sWinter：2m3/s

The river maintenance flow (5m3/s) that needs to be supplied from the dam is reduced to 2m3/s in summer and 3m3/s in winter

Summer：2m3/sWinter ：3m3/s

Water intake Water intakeSupply as part of maintenance flow

* River maintenance flow is the flow required for animals and plants to live.

With operation of the water utilization advanced

facility

Reduction of water storage Secure water storage

Water supply Limit water supply

Water level drops significantly

Small drop in water level

Dam Dam

maintenance flow

5m3/sSewage treatment water

Purification facilityLake Saiko

(Arakawa reservoir)Lake Saiko(Arakawa reservoir)



0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

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1/1 1/11 1/21 1/31 2/10 2/20 3/1 3/11 3/21 3/31 4/10 4/20 4/30 5/10 5/20 5/30 6/9 6/19 6/29

貯水位

(Y.P.m)

▼Maximum water level Y.P.＋15.0m

▼Y.P.＋8.5ｍ (Minimum water level)

Water levelWater level in 2020

Secure water storage even when snow melting is early

Drying time

Winter of 2020

Dring time

CHANGE OF DRYING TIME AT WATARASE RESERVOIR At Watarase Reservoir, as a measure to preserve the quality of tap water, the water level has been lowered

since January, and the water level has been further lowered until March to dry the bottom of the lake. In 2020, water storage capacity will be secured by making the drying period earlier and extending the storage

period.


Watarase reservoir

[Purpose of drying]Water from Watarase Reservoir is used for water supply in the Tokyo metropolitan area.

The bottom of the lake is dried up to control the mold odor of tap water.

Securing water sources by changing the drying time (image)

｜｜｜｜｜｜

Storage time in 2020

Storage time

10

ull

wate

r level

wa

ter le

ve

l

In 2020, the drying

period will be accelerated and the

storage period will be

long.

Storage when the Tone River

flow condition is sufficient

Long storage period

to secure water usage capacity

Jan. Feb. March April May



POSTPONEMENT OF MAINTENANCE AND REPAIR WORK FOR DAMS WITH CONSTRUCTION RESTRICTION WATER LEVELS

For maintenance work on the dam facilities, the water level in the reservoir needs to be lowered. By postponing the construction scheduled to be implemented in 2020, the water level of the dam will not

lowered and the water usage capacity will be secured.


Full Water level:564.0m

Water level for maintenance work:540.0m

24.0m

Securing water resources by postponing works

Water level down due to works

Flood season control level

Flood season control level

Full water level

Full water level

When water storage recovery is small

Postponement of works

Postponement of works before the Olympic game

Winter season before the Olympic game

The Olympic year

Sonohara Dam Incline maintenance work will be carried out after the Tokyo 2020 Olympic and Paralympic Games

Water level for

maintenance

work

Sediment

Dambody

Full water level

The capacity not restored

Secure water storage capacity

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Water storage capacity

:540.0m

24.0m

564.0m

Case of Sonohara dam

Water storage capacity

Winter season before the Olympic game

The Olympic year



REQUEST FOR UTILIZATION OF MUNICIPAL WATER FOR DEDICATED POWER GENERATION

CAPACITY OF DAM (YAGIZAWA DAM)

If there is a danger of severe damage caused by water shortage, TEPCO Holdings is requested to use the power generation capacity of the Yagisawa Dam for municipal water, and the water supply will be increased.


Yagisawa dam storage capacity allocation矢木沢ダム

出典︓水資源機構

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Water use capacity

Sand storage capacity

Power generation capacity

Source: Japan Water Agency （JWA)

Photos of Yagisawa dam

Full water level

Crest

L.L.W.L.

L.L.W.L. for water use

Bedrock

Water intake

Hollow Jet Valve

Full water level in flooding



For River maintenance flow, Irrigation water, municipal water, power generation water

WATER SUPPLY FROM MULTIPLE RIVER BASINS (UTILIZATION OF RAW WATER TANSFER PIPES)


Raw water transfer pipes that can interchange the raw water of the Tone River/the Arakawa River /the TamaRiver will be utilized, and the raw water of the TamaRiver will be operated according to the water shortage situation.

Utilizing raw water conduits that can accommodate raw water from the Sagami River and the Sakawa River, a stable supply of water is ensured.

Utilization of raw water transfer pipe that can accommodate raw water from the Sagami River

and the Sakawa RiverUtilization of raw water transfer pipe due to water

shortage in the Tone River

利根川水系の対応

多摩川水系の対応秋ヶ瀬取水堰

朝霞浄水場

東村山浄水場

村山貯水池（上下）

山口貯水池

小河内貯水池

（奥多摩湖）

利根大堰

武蔵水路

小作取水堰

羽村取水堰

原水連絡管

津久井導水路

道志導水路

原水導水管

原水導水管（至川崎市）

（酒匂川→相模川）

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From Tone Riverto Tama River

Ogouchi Dam(Lake Okutama)

Hamuraintake weir

Ozakuintake weir

Yamaguchi reservoir

Murayamareservoirs

Higashi-Murayamawater purification plant

Asaka

water purificationplant

Water transfer pipe

Tone large weir

Source: Tokyo Metropolitan Waterworks Bureau

Musashi Water

Conveyance Channel

Sagami dam

Shiroyama damDoushi dam Lake Sagami

Lake TsukuiLake Oku-Sagami

Miyagase dam

Lake Miyagase

Doushiwater transfer pipe

Tsukuiwater transfer pipe

Water transfer pipe(from Sakawa River to Sagami River)

Lake Tanzawa

Miho Dam

Sagami large weir

Sagami bay

Samukawa intake weir

Iizumi intake weir

Sakawa River Basin

Sagami River Basin

武蔵水路

Akigaseintake weir

羽村取水堰

小作取水堰

小河内貯水地（奥多摩湖）

From Tama Riverto Tone River

利根川水系の対応

多摩川水系の対応

秋ヶ瀬取水堰

利根大堰

朝霞浄水場

村山浄水場



Source: Kanagawa Prefecture

• Consists of water utilities across the country

• ・ Regional Chapters, 46 Prefectural Chapters, 5 Hokkaido Regional Council

• Regional branch offices of MLIT, METI and MAFF

• Tokyo• Chiba• Saitama• Kanagawa• Ibaraki• Gunma• Tochigi• JWA

JWWA support for the Great East Japan Earthquake

Water supply support from water

utilities across the countryPublic relations about water saving

• Installation of water-saving banners at the government buildings• Awareness of water saving through digital signage• Awareness of water saving in advertising media (web, poster

postings, public relations magazines, radio, SNS, etc.)

• Share information with the Japan Water Works Association (JWWA) when there is a risk of severe water shortage.

• In case of water outage, water supply support will be provided based on the JWWA mutual support scheme.

写真3 2016（H28）年渇水でのSNSによる節水啓発

JWWAThe council members

Photo 1Emergency water supply at an evacuation center the Great East Japan Earthquake(Support by Tokyo Metropolitan Waterworks Bureau in

Sendai city)

Request for restriction or suspension

of fountains, etc.

Depending on the water shortage situation, restriction and suspension of water supply to the park fountains and other facilities using water are requested.

CONTINUOUS WATER SUPPLY SECURITY ACTIONS

Damage Support by JWWA

the Great East Japan EarthquakeMarch 11, 20111M9.0

1.Water outage2.57million houses（19 prefectures）2.Pipeline damage6,684 water transfer pipes6,957 water supply pipes

Emergency water supply / restoration: 562 entitiesTotal number of water trucks: about 13,800Total number of supporters: about 41,400Activity period: 152 days

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Cooperation

Source: JWWA

Source: Tokyo Metropolitan Waterworks Bureau

Photo 4 The situation of the fountain suspension at

Hibiya Park during the 1994 water shortage

Source: Brochure of "1994 water shortage in Tokyo

metropolitan area"

Photo3 Awareness of water saving

through SNS (2016)



AUGUST 26, 2019 THE COUNCIL ON …The Tokyo 2020 Olympic and Paralympic Games will be held in 2020....

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