Abukuma River Integrated FloodManagement Project
January 2020
Abukuma River Megaflood Management Committee
Kunimi
Town

Otama
Village

Fukushima
Tamakawa
River
and National
VIllage

MiyagiShiroishi Kakuda Iwanuma
Zao
Shichikashuku Ogawara Murata Shibata Marumori
Town
Town
Prefecture
City
City
City
Town
Town
Town
Town
Ministry of Land, Infrastructure, Transport and Tourism

WatariTown

Sendai
Yamamoto
Sendai Regional
River and National Headquarters, JMA
Town
Highway Office, MLIT

Fukushima
Prefecture

Fukushima
City

Koriyama
City

Sukagawa
City

Nihonmatsu
City

Date
City

Motomiya
City

Koori
Town

Highway Office, MLIT

Fukushima
Meteorological
Office, JMAINDEX
1. Project summary2

2. Overview of the flood and disaster5

3. Particular items of the project[1] River Infrastructure Improvement

16[2] Flood-risk-conscious urban design

25[3] Adaptive district-level flood evacuation plan 31[4] Preparedness for backwater tributaries

38[5] Local municipal programmes

41
1Abukuma River Integrated Flood Management Project

1. PROJECT SUMMARY

2

Abukuma River Integrated Flood Management Project- Integrated Flood Management Strategy including tributaries and watershed measures - In October 2019, Typhoon Hagibis struck the Abukuma River Basin and caused a serious inundation disaster over thewhole basin, with numerous breaches and overtoppings of the levees, overflows from the channels and insufficientdrainage.
- Relevant organizations will cooperatively carry out comprehensive programmes, integrating both structural and nonstructural measures, for enhanced flood protection, “no one left behind” evacuation and less socio-economic damage.
[1] River Infrastructure Improvement[2] Flood-risk-conscious urban design

2nd Hamao Sluice Gate

Breached
Area
Existing Levee
Breached levee (Sukagawa city, 98.6k left of Abukuma River)*Measures and programmes may vary depending on incoming studies.

[(Mainly) Non-structural measures]<Major programmes>- National and prefectural recovery work on
damaged river structures.
- Earliest completion of work in progress.
- Measures for lowering water level alongwith the "Abukuma River Improvement Plan
(Nov 2012)" as well as excavation anddeforestation of the riverbed.
- Reinforcement of levees in backwater
tributaries and of local small rivers.
- Reinforcement and waterproofing ofdrainage facilities.
- Enhancement of flood control capacity of theexisting reservoirs.

- Urbanization risk was revealed especially in new
residential areas in lowlands.
-> Adapt urban land-use and habitation to the flood risk.

Mutuallinks

Links between Infrastructure development, landusemanagement, evacuation plan, etc.

[Structural measures] approx. ¥184.0bil.
- The highest-ever recorded flood caused
many levee breaches, overtoppings,
overflows and insufficient drainage.
-> Enhance measures for lowering waterlevel and strengthening levees.

<Major programmes>- Modification of urban land-use plans along with the flood risk.
- Integrating hazard maps considering tributaries and drainage.
- Rain water storage facilities or other watershed measures.
- land-use restriction in frequently inundated areas.

Storage below the park

Rain water storage facility(Koriyama City)[3] Adaptive district-level flood evacuation plan
- District-level evacuation actions varies with individual inundating situations.
-> Enhance adaptive evacuation support communication at the district-level.
<Major programmes>- Improvement of "Flood Timelines" considering tributaries and drainage.
- "District-level flood timelines" and drills with them in flood hazardous areas.
- Formulating "District Evacuation Plan" utilizing increasing low-cost water-gauges.
- Enhancement of dam-related flood hazard maps and prefectural flood alerts in tributaries.

[4] Preparedness for backwater tributaries- The backwater affects floods in many tributaries.
-> Strengthen preparedness for backwater-affected
tributaries around the confluences.
<Major programmes>- Water-gauges and CCTVs on backwater tributaries.
- "District Evacuation Plan" along with the water-gauges inbackwater tributaries.

A Confluence (Motomiya City)[5] Local municipal programmes-> Local flood risk reduction measures considering local situations.
- Run-off suppression, resident's evacuation drills, media involvement strategies, etc.

3

Abukuma River Integrated Flood Management Project (River Infrastructure Improvement)- Integrated Flood Management Strategy including tributaries and watershed measures - National, prefectural and municipal measures for enhanced flood protection, “no one left behind” evacuation and less socio-economic damage.
- Project Cost : ¥184.0bil. (approx.)- Project Menu :- Improvement Work
National Project (Fukushima Area)
Project Cost : ¥99.9bil. (approx.)
Project Period : FY2019 - FY2028
National Project (Miyagi Area)
Project Cost : ¥21.5bil. (approx.)
Project Period : FY2019 - FY2024
Fukushima prefecture : ¥6.6bil. (approx.)
Miyagi prefecture: ¥1.8bil. (approx.)- Recovery Work
National Project (Fukushima Area)
Project Cost : ¥13.0bil. (approx.)
Project Period : FY2019 - FY2020
National Project (Miyagi Area)
Project Cost : ¥9.9bil. (approx.)
Project Period : FY2019 - FY2020
Fukushima prefecture : ¥26.8bil. (approx.)
Miyagi prefecture: ¥4.4bil. (approx.)
令和元年10月13日12時頃* Prefectural work, which have not been confirmed
県 be added to the above.
yet, will境

Iwanuma City
5.0k
仙台東部道路
仙台
南部
道路

Watari Town

国道4号
10.0k

excavation

Levee improvement

Levee improvement / excavation

30.0k 35.0k

Levee Improvement

国
道
4
号

Levee improvement / excavation
KakudaCity

Levee improvement

40.0k

国
道
１
１
３
号

Marumori Town
45.0k

50.0k

MiyagiPref.

国道３４９号

Fukushima
Pref.

磐
越
自
動
車
道

Motomiya City

Fukushima City
90.0k

excavation

伏
黒
水
位
観
測
所
▲

25.0k

Shibata
Town

100.0k
60.0k

Levee improvement / excavation

20.0k

Date City

Levee improvement

国道４号

70.0k

Nihonmatsu
City

Levee Construction
Ongoing
levee work

128.0k 130.0k

110.0k

150.0kYabuki Town

Retardingbasin(s)140.0k

120.0kKagami-ishi
Town

excavation

東北自動車道

Kunimi Town
Koori Town

Levee improvement

National levee breach
Prefectural levee breachInundated area
Nationally managed section

Levee improvement

Ongoing
levee work

Tamakawa Vil.

Levee improvement

Levee Construction
excavation

80.0k

LegendAbukumaRiver

Fukushima

Drainage facility improvement

15.0k

Levee improvement

Riverbed excavation

Miyagi

Pacific Ocean

Levee improvement

Koriyama
City

Sukagawa
City

国
道
１
３
号

*Figures may change with incoming study.

4

Abukuma River Integrated Flood Management Project

2. OVERVIEW OF THE FLOOD AND
DISASTER

5

Evaluation of the rainfall by Typhoon Hagibis (No. 19) in October 2019
-Typhoon Hagibis (Typhoon No. 19 in Japan) resulted in an average rainfall of 253mm over thewhole Abukuma Basin, which exceeded former record floods such as the 1986 flood (known as
the "August 5 Flood") or the 1998 flood ("August 27 Flood").
Weather chart and satellite image
Weather chart (9pm, Oct 12)

Typhoon Hagibis in 2019200～250mm

Satellite image (1am, Oct 13)

250～300mm

300～400mm

150～200mm

400～500mm
500～600mm
250～300mm

出典：気象庁

出典：気象庁

1986 Flood200～250mm
600～700mm

300～400mm

1998 Flood

250～300mm

50～100mm

400～500mm

150～200mm

300～400mm

200～250mm
300～400mm

250～300mm

200～250mm

20～50mm

300～400mm

200～250mm

250～300mm

50～100mm
100～150mm

150～200mm

150～200mm
200～250mm
250～300mm
300～400mm
400～500mm

150～200mm
50～100mm

250～300mm

Average
2-day
Rainfall:
234 mm

500～600mm

Average
2-day
Rainfall:
253 mm200～250mm

Average
2-day
Rainfall:
208 mm

300～400mm

6Water gauge records in Abukuma River- 9/10 major water gauges broke their records in Abukuma River.
- 9/10 major water gauges exceeded their dangerous point and 3 of them in Motomiya,
Koriyama and Sukagawa City surpassed the Estimated High Water Level (HWL)** Estimated high water level: A water level set to give a standard to flood control and the design of related structures such as levees or bridges.

<Gauges in Fukushima Prefecture (upstream)>
Water gauge

Fushiguro(Date City)

Fukushima(Fukushima City)

Nihonmatsu(Nihonmatsu City)

Motomiya(Motomiya City)

Akutsu(Koriyama City)

Sukagawa(Sukagawa City)

Yagita(Fukushima City)

Location

R66.10km
Abukuma River(mainstream)

L77.10km
Abukuma River

R106.60km
Abukuma River

R118.10km
Abukuma River

R133.60km
Abukuma River

R147.90km
Abukuma River

R1.40km
Arakawa River(Tributary)

HWL

7.27

6.56

13.18

9.29

8.68

7.99

3.46

dangerous point
evacuation point
flood alert point
preparation point

5.00
4.50
4.00
3.00

5.40
5.10
4.00
3.00

10.40
10.10
6.50
5.50

7.90
6.30
5.00
4.00

7.90
6.80
5.50
4.00

7.70
7.10
4.50
3.50

2.00
1.30
1.20
0.50

Sep 17, 1948

Aug 5, 1986

Sep 22, 2011

Jul 23, 1941

Sep 21, 2011

Jul 23, 1941

Aug 6, 1989

6.00

5.90

11.57

9.63

9.20

9.00

2.50

1:30am, Oct 13, 2019

3:20am, Oct 13, 2019

4:50am, Oct 13, 2019

2:10am, Oct 13, 2019

1:30am, Oct 13, 2019

7:20am, Oct 13, 201923:10pm, Oct 12, 2019

Past record

Records by
Typhoon Hagibis

6.34

6.43

12.80

9.73

10.01
10.00

99.57
.61

2.55

Highest ever recorded

Highest ever recorded

Highest ever recorded

Highest ever recorded

Highest ever recorded

Highest ever recorded

Highest ever recorded

0.44m over
HWL

1.33m over
HWL

1.62m over
HWL

*10 minutes data as of 14
Oct 2019(water levels are in meters)<Gauges in Miyagi Prefecture (downstream)>
Water gauge

Marumori(Marimori Town)

Kasamatsu(Shibata Town)

Iwanuma
Iwanuma City

Location

R37.20km
Abukuma River

R28.10km
Abukuma River

L8.10km
Abukuma River

HWL

23.70

17.99

8.25

dangerous point
evacuation point
flood alert point
preparation point

22.30
22.00
19.50
18.00

17.00
16.60
14.50
13.00

8.20
7.90
5.00
4.00

Past record

Jul 23, 1941
22.65

Aug 5, 1986
17.10

Jul 23, 1941
8.04

4:40am, Oct 13, 2019

5:00am, Oct 13, 2019

6:00am, Oct 13, 2019

23.49

17.48

7.17

Highest ever recorded

Highest ever recorded

6th highest ever recorded

Records by
Typhoon Hagibis

CCTV Image in the morning of Oct 13(R95.6 of Abukuma River, Sukagawa City)

Levee Line
(sunken)

AbukumaRiver

7Time Series Water Levels of the Flood from Typhoon Hagibis (No. 19), 2019 [1/3]Motomiya City

9.70m at
3am, Oct 13, 2019Oct 2019, Hagibis
Sep 2011 Flood

MiyagiPref.

Jul 2002 Flood
Aug 1998 Flood

5hrs over
HWL

Aug 1986 Flood

AbukumaRiver

Koriyama City

9.98m at2am, Oct 13, 2019Oct 2019, Hagibis
Sep 2011 Flood
Jul 2002 Flood
Aug 1998 Flood
Aug 1986 Flood

14hrs over
HWL

Fukushima
Pref.

Sukagawa City

9.60m at
8am, Oct 13, 2019Oct 2019, Hagibis
Sep 2011 Flood
Jul 2002 Flood
Aug 1998 Flood
Aug 1986 FloodRain gauge

15hrs and 50mins
over HWL

Water gauge
Water Quality Meter*Data from hourly records and vary with 10min records in former pages.

8Time Series Water Levels of the Flood from Typhoon Hagibis (No. 19), 2019 [2/3]
Date City
Oct 2019, Hagibis

6.29m at2am, Oct 13, 2019

MiyagiPref.

Sep 2011 Flood
Jul 2002 Flood
Aug 1998 Flood
Aug 1986 Flood

AbukumaRiver

Fukushima City
八木田

6.42m at
3am, Oct 13, 2019福島

Oct 2019, Hagibis
Sep 2011 Flood
Jul 2002 Flood
Aug 1998 Flood
Aug 1986 Flood

Fukushima
Pref.

Fukushima City
(Arakawa River / tributary)

2.53m at
11pm, Oct 12, 2019Oct 2019, Hagibis
Sep 2011 Flood
Jul 2002 Flood
Aug 1998 Flood
Aug 1986 FloodRain gauge
Water gauge
Water Quality Meter*Data from hourly records and vary with 10min records in former pages.

9Time Series Water Levels of the Flood from Typhoon Hagibis (No. 19), 2019 [3/3]
Iwanuma City
10.0
9.0

8.0

MiyagiPref.

はん濫危険水位 8.20m

避難判断水位 7.90m

HWL 8.25m

水位(R1.10
Oct2019, 岩沼)Hagibis

最高水位
7.17m
7.17m
at
6am,（10月13日
Oct 13, 20196:00）

水位(H23.9)
Sep
2011 Flood

水位(H14.7)
Jul
2002 Flood

7.0

岩沼

水位(H10.8)
Aug1998 Flood
水位(S61.8)
Aug1986 Flood6.0
はん濫注意水位 5.00m
水防団待機水位 4.00m

(

水 5.0
位
m 4.0

)

3.0
2.0

笠松

1.0

Abukuma
River

0.0
-1.0
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00

-2.0

丸森

10月12日

10月13日

10月14日Shibata Town
20.0
19.0

HWL 17.99m

18.0
17.0

Oct
2019,笠松)Hagibis
水位(R1.10

17.48m at
5am, Oct 13, 2019

水位(H23.9)
Sep
2011 Flood

水位(H14.7)
Jul
2002 Flood

はん濫危険水位 17.00m

避難判断水位 16.60m

水位(H10.8)
Aug1998 Flood
水位(S61.8)
Aug1986 Flood16.0
はん濫注意水位 14.50m(

水 15.0位
m 14.0)

水防団待機水位 13.00m

13.0
12.0
11.0

10.0
9.0
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00

8.0

Fukushima
Pref.

10月12日

10月13日

10月14日Marumori Town
26.0
25.0

24.0

HWL 23.70m

23.0
22.0

避難判断水位 22.00m

水位(H23.9)
Sep
2011 Flood

水位(H14.7)
Jul
2002 Flood
水位(H10.8)
Aug1998 Flood

はん濫危険水位 22.30m

水位(S61.8)
Aug1986 Flood(

水 21.0位
m 20.0

水位(R1.10
Oct2019, 丸森)Hagibis3.49m at
4am, Oct 13, 2019)

はん濫注意水位 19.50m

19.0
水防団待機水位 18.00m

18.0
17.0

Rain gauge

16.0
15.0

Water Quality Meter

14.0
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00
1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
0:00

Water gauge

10月12日

10月13日

10月14日*Data from hourly records and vary with 10min records in former pages.

10

Photos of the Flood from Typhoon Hagibis (No. 19), 2019 [1/5]
3. Yukiai Bridge, Koriyama City (87km)
AM, Oct 13, 2019

1. Aadatara River confluence, Motomiya City (68km)
AM, Oct 13, 2019

Shodai Bridge

Adachi Bridge
Yukiai Bridge

Adatara River

②

④

③

①

2. Fukuyama Bridge, Koriyama City (81km)

4. Shakado River confluence, Sukagawa City (97km)
浜尾遊水地
AM, Oct 13, 2019

AM, Oct 13, 2019

Shakado River

Fukuyama
Bridge江持橋

江持橋- Photos from helicopters and drones on Oct 13, and airplanes on Oct 14
11

Photos of the Flood from Typhoon Hagibis (No. 19), 2019 [2/5]

1. Isazawa district, Date City (4km)

3. Surikami River conludence, Fukushima City (19km)

1:10pm, Oct 13, 2019①

SurikamiRiver②
2:55pm, Oct 13, 2019③
4. Arakawa River confluence, Fukushima City (28km)
2. Tokue Bridge, Date City (10km)④

2:01pm, Oct 13, 2019
Tokue Bridge

4:30pm, Oct 13, 2019
Shinobu
BridgeArakawaRiver

H29 10/23 10:10頃 撮影- Photos from helicopters and drones on Oct 13, and airplanes on Oct 1412

Photos of the Flood from Typhoon Hagibis (No. 19), 2019 [3/5]
Abukuma Bridge, Iwanuma City (8.1km)

Abukuma

6:40am, Oct 13, 2019

Marumori Bridge, Marumori Town (37.2km)

Flood Water Level

Normal Water Level

Abukuma
Abukuma

5:14am, Oct 13, 2019

*CCTV images

13

Photos of the Flood from Typhoon Hagibis (No. 19), 2019 [4/5]
Inundation at Marumori Town (Photo on Oct 13)
Shinmei-Minami District

AbukumaMarumori
BridgeFire station

Junior HighSchoolMarumori Town

Town Office

Shinkawa Uchikawa
River
River

Car park at the Town Office

Car park at the Town Office14

Photos of the Flood from Typhoon Hagibis (No. 19), 2019 [5/5]
AbukumaMarumori
Bridge*Photos from drones
Junior HighSchool②
AbukumaJunior HighSchoolMarumori Town
Town Office②③

Town Office③①

Uchikawa
River

ShinkawaRiver①
Marumori
BridgeAbukumaUchikawa
River

Town OfficeSinkawaRiver

15

Abukuma River Integrated Flood Management Project

3. PARTICULAR ITEMS OF THE PROJECT[1] RIVER INFRASTRUCTURE IMPROVEMENT

16[1] River Infrastructure Improvement (1/6)

Abukuma River
Integrated FloodManagement Project

National and prefectural recovery work on damaged river structures
Temporary recovery with a backup levee for final recovery (Nov 9, 2019)
Breached levee at Sukagawa City (Oct 14, 2019)

Design and chronicle of the temporary recovery work

Further work for the final recovery, based on the report of"Abukuma Levee Committee", consisting of specialists inriver management and soil engineering.
Temporary levee (left)
1,900m3 (5 days)*Rough filling for earlier completion
Backup levee (right)
8,000m3 (24 days)*Tight compaction ready for the next flood season

3PM, Oct 14
Oct 18
8PM, Nov 8

Commencement
Temporary levee complete
Temporary recovery complete

In total 80 national recovery work projects and hundreds of prefectural work
projects required for repairing damaged facilities. (to be finished by FY2021)
Damaged protection blocks

Motomiya City

Flood leakage
through the levee

Kunimi Town

Damaged ground sillin the riverbed

Fukushima City17

[1] River Infrastructure Improvement (2/6)

Abukuma River
Integrated FloodManagement Project

Earliest completion of work in progress (Fukushima Prefecture)
Upgrading concrete levee in Motomiya City (Finish in FY2020)
Completed

Concrete levee
under construction

Completed

Soil levee
under construction

Completed concrete levee

Constructing new levee in Koriyama City (Finish in FY2020)
Land readjustment by
the City Office

Levee construction area
Miyota district

New bridge project by
the City Office▽High water level
Abukuma river

New levee
old levee

Rough cross section

至 郡山駅

18
18

[1] River Infrastructure Improvement (2/6)

Abukuma River
Integrated FloodManagement Project

Earliest completion of work in progress (Miyagi Prefecture)
Levee improvement in Shibata Town
Kakuda City

Estimated flood potential area

Shibata Town

Abukuma
Levee improvement▽High water level

Cross section19[1] River Infrastructure Improvement (3/6)

Abukuma River
Integrated FloodManagement Project

Completion of on-going excavation and deforestation of the riverbed (Fukushima Prefecture)
Planned excavation and deforestation areas (green arrows) andlevee improvement (red arrows) along with the"3-year Project for National Resilience and Disaster Risk Reduction" (2018-2020)

Deforestation of the riverbed(Fukushima City)

蓬莱ダム

After

福 島 市
信夫ダム

伊達市
（樹木伐採）
塩
野
川

50k

兜
橋

梁
川
大
橋

阿武隈急行鉄道橋
観音橋
鶴ヶ岡橋
東
広瀬橋
根
万代橋
川

伊 達 市

水徳
管江
橋

60k

富
士
見滝
橋川

国 見 町

徳
江
大
橋

伊
達
崎
橋
佐
久
間
川

昭
和
大
橋

伊 瀬
達 上
橋 橋
産
ヶ
沢
川

桑 折 町

90k

智恵子大橋

福島市
福島市
（河道掘削） （樹木伐採）

岡部（堤防強化）

鉄阿
道武
伏 橋隈
黒
急 70k
水
大
行
正管
橋橋

100k

鎌
田
大
橋

文
知
摺
橋

三
本
木
橋

松
月
川
の
橋
輪
橋蛭
川八
反
田
川
摺
上
川

渡
利
大
橋

弁
天
松大天橋
齢仏神
橋橋橋

阿
武
隈 蓬
川
水 莱
管 橋
橋

二本松市
東北新幹線
第5橋梁

80k

濁川

南町排水機場
（耐水化）

八木田橋

松
川

Before安達ヶ橋

福島市荒川（樹木伐採）

信夫橋

あづま橋
大
森
川 仁
上
井
八
荒
田
木
橋
田 川西
橋 水大
管
橋橋

油井川

さ
く
ら
橋

日
之
倉
橋

荒
川
橋

あ
づ
ま
公
園
橋

小
富
士
橋

須賀川市
荒川

福 島 市

腰浜
（堤防強化）

智恵子大橋

三 春 町
二本松市

Excavation of the riverbed (Nihonmatsu City)

東北新幹線
第5橋梁
油井川

安達ヶ橋
高田橋 郡山市（河道掘削・樹木伐採）
二本松市（河道掘削）

舟形橋

110k

横
断
道
郡
阿
武
山 小
和隈
滝川
市 橋
橋

鬼生田橋

阿
久 安
津 原
橋 橋

東北新幹線
第4阿武隈橋杉
田川

本宮市（河道掘削・樹木伐採）
大 玉 村

安
達
太
良
橋

上
安ノ
達橋
橋

昭
代
橋
安
達
太
良
川

120k平
成
大
橋

阿武隈川橋
五百川橋

逢
瀬
川

愛
宕
川
東北本線五百川橋
日本橋

本 宮 市

本宮市
（樹木伐採）

大
滝
根
川

江
下 持
江 橋
持
橋

第東
3北
日 阿新
ノ 武幹
谷田川出 隈 線
歩川
道鉄
橋橋

行
合細 中
橋表 央金
橋
山
大橋
橋

130k 逢隈橋

二本松市

Before

郡山市（樹木伐採）

本 宮 市
菅田橋

After

雲
水
峰
橋

郡 山 市

1140k
永東
徳北
橋新
日新東耳東
幹
の橋北語北
線
出 新橋本
橋 幹 線 笹 第
2
線 笹
原
笹 原
阿
原 川 川
武
川 橋
隈
橋
川
橋

久保田
（裏法尻）

御
代
田
橋

水郡線
鉄橋

郡 山 市

東北本線
鉄道橋
釈迦堂橋

小
作
田
橋

大
仏 男
大 滝
橋 橋

玉 川 村
乙字橋
乙字大橋
159k

阿武隈川

未来大橋
中宿橋
須賀川橋
新橋

須賀川
（樹木伐採）

釈
迦
堂
川

須賀川市
（河道掘削）

須賀川市

20

[1] River Infrastructure Improvement (3/6)

Abukuma River
Integrated FloodManagement Project

Completion of on-going excavation and deforestation of the riverbed (Miyagi Prefecture)
Planned excavation and deforestation areas (green arrows) andlevee improvement (red arrows) along with the"3-year Project for National Resilience and Disaster Risk Reduction" (2018-2020)

柴田郡
大河原町

村田町

40k

(

阿
阿武
武隈
隈川
急第
行二
橋
梁

舘矢間
（堤防強化）)

丸森橋(国)角田市
４

内川

丸森大橋(県)小田川35k
枝野橋(市)
丸森町

雉子尾川

柴田町
（樹木伐採）

角田橋(県)
東根橋(県)

30k
新
桜
井
川

半
田
川

柴田町

白幡橋(国)

阿武隈急行線鉄道橋(JR)
東北本線鉄道橋(JR)

25k

柴田町
（河道掘削）

20k

角田市（樹木伐採）

丸森町（河道掘削・樹木伐採）

15k

Abukuma槻木大橋(県)

角田市
阿武隈川水道橋

Under deforestation
６

岩沼市

阿武隈川鉄道橋

常磐自動車道10k

阿武隈橋(国)

亘理町
山元町

五間堀川

Before

岩沼市（河道掘削）

６

5k

４

名取市
阿武隈大橋
(東日本高速道路)

仙台東部道路

亘理大橋(県)

鳥の海
0k

五間堀川

太平洋

Deforestation of the riverbed (Marumori Town)26[1] River Infrastructure Improvement (4/6)

Abukuma River
Integrated FloodManagement Project

Large-scale measures for lowering water level along with the "Abukuma River Improvement Plan"(Fukushima Prefecture)
Large-scale river improvement work after the disaster
Project cost:
Project duration:
Excavation volume:Rebuilding bridges:

Date City¥99.9bil. (approx. $1bil.)
FY2019-FY2028 (10 years)
2.2 mil. m3
2 bridges

Levee construction:
400m
Development of three retarding basins

Fukushima
Prefecture

Tamakawa Vil.

MiyagiPref.

Miharu Town
KunimiTown

Shiroishi
City

Nihonmatsu City

Koori
Town

Koriyama City

Kagami-ishi
Town

YabukiTown

Sukagawa City

Motomiya City

Fukushima
City
Shichikashuku
Town

Otama Vil.

Recovery work of river facilities
National levee breach

Excavation and levee work

Prefectural levee breach

Bridge rebuild

National damaged facilities

Considered area for retarding basins

Nationally managed section

Project cost:
Project duration:¥12.1bil.
FY2019-FY2020

8 levee recoveries, 8 leakage prevention work projects,
47 protection block repairs, 3 Sluice gate repairs and
14 ground sill repairs* The above large-scale project has been adopted and will proceed
simultaneously with the recovery work.

22[1] River Infrastructure Improvement (4/6)

Abukuma River
Integrated FloodManagement ProjectＮ

Large-scale measures for lowering water level along with the "Abukuma River Improvement Plan"(Miyagi Prefecture)
L5.0k
Watari Town

R5.4k

Large-scale river improvement work after the disaster▲岩沼観測所

MiyagiPrefecture

Project cost: ¥8.6bil.
17.0ｋ

Iwanuma City凡

Project duration: FY2019-FY2024(Excavation volume: 0.7 mil. m3)
31.6ｋ

25.6ｋ

HWL exceeding section

R13.4k例

Inundated area
Prefectural levee breachNational damaged facilities
Nationally managed section

HWL exceeding section

Marumori Town

Recovery work
Improvement

Excavation

R32.4k

R30.0k

L18.0k
L20.8kRecovery work of river facilities
Project cost: ¥1.2bil. Project duration: FY2019-FY2020

L36.6k

L37.0k

37.0ｋ(9 leakage prevention work projects)
Flood leakage trail: L18.0k

Anti-leakage work: R20.8k

Anti-leakage work: R30.0k

Anti-leakage work: R32.4k

Anti-leakage work: L36.6k

Anti-leakage work: L37.0k

HWL exceeding section 47.6ｋ

県境

Fukushima
Pref.

23

[1] River Infrastructure Improvement (5/6)

Abukuma River
Integrated FloodManagement Project

Reinforcement of the tributaries and local small rivers
Construction of an underground floodway of Sasadaira River, a small tributary, Sukagawa City

笹平川

Inundation Map(a flood in 2011)

分水路イメージ

Flood in September 2011

凡 例

浸水深1.0m～2.0m未満
浸水深0.5m～1.0m未満

Flood from Typhoon Hagibis in October 2019

浸水深0.5m未満

2424

[1] River Infrastructure Improvement (6/6)

Abukuma River
Integrated FloodManagement Project

Reinforcement and waterproofing of drainage facilities

Improvement of drainage facilities

Waterproofing drainage facilities
Waterproofing the door

Originally equipped with a slide gate requiring manual operation

Improvement

Equipped with a flap gate, automatically closes in a flood
25

Abukuma River Integrated Flood Management Project

3. PARTICULAR ITEMS OF THE PROJECT[2] FLOOD-RISK-CONSCIOUS URBAN DESIGN

26

[2] Flood-risk-conscious urban design (1/4)

Abukuma River
Integrated FloodManagement Project

Modification of urban land-use plans, including Location Normalization Plan, along with the flood risk
- Municipalities may formulate a "Location Normalization
Plan (LNP)" as a part of statutory city-planning, which has
a legal effect to restrict uncontrolled residential
development by the private sector.
- By excluding risk areas from the "Residence Instruction
Area(RIA)" in LNP, a prior notification to the municipal
office is obligatory to residential developers.
- Municipalities are to utilize LNP system to achieve floodrisk-conscious land-use and urban design.

Conceptual figure ofLocation Normalization
Plan<Example of flood-risk-conscious LNP in Koriyama City>"Residence Instruction Area"
to concentrate residences tothe centre of the city.

Residence Instruction
Area
Urbanization
Promotion Area

<Below areas are excluded from RIA>
Exclusive Industrial Zone
District Planning Area
Distribution Business Park
Excluded for other reasons
Hazardous areas

Coloured areas are
excluded from
"Residence Instruction
Area" to restrict
residential development

Sediment Disaster Prone Area
House Collapse Risk Area in Flood Risk Area
Flood Risk Area with more than 1m of estimated flood depth27[2] Flood-risk-conscious urban design (2/4)

Abukuma River
Integrated FloodManagement Project

Integrating flood hazard maps considering tributaries and drainage- The flood hazard maps (or flood risk maps) are formulated by the municipalities based on the estimated inundation map,
which is published by the river manager; MLIT for nationally managed sections and the prefecture for the others,
whereas the drainage hazard maps are published by municipalities based on the actual capacity of the drainage facilities.
- Although both flood and drainage hazard maps should be integrated, only a few municipalities have achieved this.
- In addition, some relatively small tributaries have not yet been considered in the flood hazard maps.
- Municipalities will publish integrated flood hazard maps considering tributaries and drainage.
<Example of a drainage hazard map in Koriyama City><Example of a flood hazard map in Koriyama City>

Estimated inundation depthwith different colours

Information on
evacuation shelters2828

[2] Flood-risk-conscious urban design (3/4)

Abukuma River
Integrated FloodManagement ProjectRain water storage facilities or other watershed measures- Watershed measures to reduce the amount of flooding are needed especially in urbanized areas like Fukushima or
Koriyama City.
- Several projects have been / will be carried out to construct rain water storage facilities as well as other watershedmeasures.

Storage below the park

Hayama Rain Water Storage, Koriyama City (completed in July 2019)
Conceptual figure of the Hayama Storage
City
OfficeShopping mall

HayamaPark

Storage

Storage
V=2,200m329

[2] Flood-risk-conscious urban design (4/4)

Abukuma River
Integrated FloodManagement Projectland-use restriction in frequently inundated areas- Municipalities may designate "Disaster Risk Areas (DRA)" based on the Building Standards Act with the restriction ofbuildings with conditions such as waterproofed or raised floors, to avoid human casualties from the flood.
- This institution has been already applied by some municipalities and is to be utilized by others as well.
Conceptual figure of integrated levee design with designation of the "Disaster Risk Areas (DRA)"

Continuous leveeconstruction withoutland-use restriction"Waju-tei"(surrounding levee)

Land-use restriction
as an integrated
manner with thelevee design

Land-use restriction with
DRA in the flood risk
areas outside the levees

Restricted area by thedesignation of DRA

Example in
Nihonmatsu City

Example in
Date City

30
30

Abukuma River Integrated Flood Management Project

3. PARTICULAR ITEMS OF THE PROJECT[3] ADAPTIVE DISTRICT-LEVEL FLOOD
EVACUATION PLAN31

[3] Adaptive district-level flood evacuation plan (1/6)

Abukuma River
Integrated FloodManagement Project

Improvement of "Flood Timelines" (flood disaster response plans) considering tributaries and drainage- Every municipality in Abukuma Basin has developed a simple "Flood Timeline", or flood disaster response plan, as apreparation for flood disasters, which includes simple instructions on "when", "who" and "what to do" along with atimeline prior to the flood event, but it does not include detailed information such as the department-in-charge.
- These plans are to be updated as "Detailed Flood Timelines" based on detailed discussions among the departments in
the institutes, as well as with the related organizations, and in an integrated manner considering the risks in tributaries
and drainage operations, which have not been considered.
Current "Flood Timeline" (Simple version) <Fukushima City>
Estimated
meteorologicalsituation

Preparationlevel of theCity OfficeTimeline prior to the flood event(from "-72hrs" to "zero hrs")

Preparation level ofother organizations<Koriyama City>
Estimated
meteorologicalsituation* Both Fukushima and Koriyama Cities have alreadydeveloped "detailed" versions.

Preparation level of Preparation Preparation
other organizations level of the level of theCity Officeresidents

Timeline prior to the flood event with estimated water levels(from "-72hrs" to "zero hrs")32[3] Adaptive district-level flood evacuation plan (2/6)

Abukuma River
Integrated FloodManagement Project"District-level flood timelines" and drills in flood hazardous areas- The "District-level flood timelines", or district flood disaster response plan, is established in some municipalities in Japan.
(The below example comes from Kiho Town in Wakayama Prefecture)- This is used for the leaders and residents in the neighbourhood association, or "Chonai-kai" in Japanese, including
instructions on "When", "Who" and "What to do", and is maintained and revised through cyclic drills in the community.
- This idea is to be spread and implemented over the local communities in the Abukuma River Basin.

Timeline prior to theflood event(from "day -3" to"zero day")"Preparation
Level 1"(day -3 prior to
the event)"Preparation
Level 2"(day -2)"Preparation
Level 3"(-24hrs to-12hrs)"Preparation
Level 4"(-6hrs)"Preparation
Level 5"("Zero" hours to
the event)Required information to
be checked
Determination criteria toeach level
Preparation items for the
residents

Preparation items for persons
requiring special help
Things for the community
leader and staff to do
Things for the relatedorganizations to do33

[3] Adaptive district-level flood evacuation plan (3/6)

Abukuma River
Integrated FloodManagement Project

Dissemination of "My-timelines" in the flood hazardous areas
The "My-timeline" is a standardized personal or household disaster response plan including required actions for theevacuation, response to the incoming disaster information, optimized for the situation surrounding respective families.
Training workshop for "My-timeline"

Example of a supporting tool for "My-timeline"

Example of a training workshop in Hiraizumi Town, Iwate Prefecture

At the workshop, key persons of the district, such ascommunity leaders, voluntary firefighters or teachers, will
discuss about timeliness and proper of the evacuationroutes, and will formulate "My-timeline" based on thediscussion.

The key persons above will bring their discussion results tothe original organizations and will perform as a "lecturer" attheir respective institutes, including the neighbourhood
association, volunteer fire companies and the schools.

Instruction on the benefits of "Mytimeline"

Check sheet and instruction movie
on formulating "My-timeline"

This supporting tool can be downloaded below:

http://www.river.or.jp/jigyo/my-timeline_download.html
34

[3] Adaptive district-level flood evacuation plan (4/6)

Abukuma River
Integrated FloodManagement Project

Enhancement of the "Marugoto Machigoto Hazard Map" to improve flood awareness of the residents"Marugoto Machigoto (town-wide) Hazard Map" is an initiative to install information of the flood hazard maps to actualstreets and towns using simple notice boards, which includes existence of the flood risk, estimated flood depth and routes
to the nearest evacuation shelter. This initiative is aimed at improving flood awareness of the local residents.
Example of "Marugoto Machigoto (town-wide) Hazard Map" (Nagai City, Yamagata Prefecuture)

Discussion and confirmation of theevacuation routes

Discussion on flood risks and dangerous
sites by community members

Field study for confirming evacuation Revision based onroutes and dangerous sites
the discussion

Improving awareness of the residents
Flood awarenessthrough daily life

Evacuation awarenessthrough daily life

In an emergency
proper decision-making withproper information

Safe and smooth evacuation

Attaching boards describing estimated flood
depth and evacuation route on telegraph poles orother facilities on the street35[3] Adaptive district-level flood evacuation plan (5/6)

Abukuma River
Integrated FloodManagement Project

Formulating "District Evacuation Plan" utilizing increasing low-cost water-gauges- Low-cost water-gauges are being implemented in
the Abukuma River Basin.
(National 21 gauges and prefectural 81 gauges, asof Jan 2020)- These gauges are to be linked with the district-levelevacuation plan, which is also a part of the wholeproject.

Example of a low-cost water-gauge along the Abukuma River(Oni-uda, Koriyama CIty)

Water level sensor

Transmitter- Equipped with solar cells and batteries, requires no external power supply.
- Costs approx. ¥1mil. each, less than one-tenth of conventional models.

YawataDate
City 349

KunimiTown

Solar cell

Locations of nationally equipped conventional andlow-cost water-gauges along the Abukuma River

Fushiguro
115

399

13

13

Fukushima
City

Low-cost water-gauges
Conventional water-gauges「災害復旧」
既設水位観測所

Nihonmatsu
City
459

49

Otama
Vil.

AkutsuKami-nagura
115

（福島市）

Miharu Dam

MotomiyaCity

Motomiya

Surikami-gawa
Dam

YagitaNihonmatsu

Sukagawa

Fukushima
Pref.

Fukushima 福島

Sukagawa
118
City*This figure shows only national water-gauges and many prefectural ones are also being equipped.

Ishikawa
Tamakawa
Town
Vil.

Kagamiishi
Town
4

Koriyama
City

Kosakuda

Koori
To

288

459

114

YabukiTown

Nakashima
Town

Izumizaki
Town

36

[3] Adaptive district-level flood evacuation plan (6/6)

Abukuma River
Integrated FloodManagement Project

Enhancement of flood hazard maps and flood alerts in prefectural managed rivers- Among the prefecturally managed rivers, 32 havebeen already equipped with the flood alert system.
- 31 other rivers are to be designated as flood alertrivers.
- Estimated inundation maps, which are the base offlood hazard maps of the municipalities, are to be
published for these 63 rivers, 21 of which will havebeen been finished by the end of FY2019.
Plan for the flood alert system
FFR: Flood Forecast Rivers
WAR: Water-level Announcement Rivers
FFR

WAR

total

Equipped

3

29

32

Planned

0

31

31

total

3

60

63

Schedule of the publication of
the estimated inundation maps
FY

-2018

2019

2020

2021-

total

Equipped

10

11

18

24

63

BLUE RIVERS: 32 rivers equipped with flood alert system
RED RIVERS: 31 rivers to be equipped37

Abukuma River Integrated Flood Management Project

3. PARTICULAR ITEMS OF THE PROJECT[4] PREPAREDNESS FOR BACKWATERTRIBUTARIES

38

[4] Preparedness for backwater tributaries (1/2)

Abukuma River
Integrated FloodManagement Project

Water-gauges and CCTVs on backwater tributaries

Takigawa River / Date City

Adatara River / Motomiya City

- Many breaches happened at backwater-affected
tributaries around the confluences.
- Generally, water-gauges in tributaries are set to avoid
effects of the mainstream with no information on thewater level at the tributaries near the confluences.
- Water-gauges along with CCTVs are to be equipped atsuch "Backwater Tributaries" to provide information atexact points.

Nationally managed rivers

Prefecturally managed rivers

Abukuma

Breached levees
Existing tributary water-gauges

Sakuma River / Koori Town

Nigori River / Fukushima City
Fujita River / Koriyama City

Yata River / Koriyama City

Modified based on the map provided by Geospatial Information Authority of Japan (maps.gsi.go.jp)39[4] Preparedness for backwater tributaries (2/2)

Abukuma River
Integrated FloodManagement Project"District Evacuation Plan" along with the water-gauges in backwater tributaries
Example of a backwater tributary and the affected area
(Nigori river, Fukushima City)- Districts affected by backwater
tributaries are to formulate a "District
Evacuation Plan" subject to the newly
developed water-gauges in backwater
tributaries.

Supposed area forthe backwater
water-gauge

Existing gauges(Conventional type)

Existing gauges(Low-cost type)

GonomeDistrict

Breached levee
Inundated area

Modified based on the map provided by Geospatial Information Authority of Japan (maps.gsi.go.jp)

40Abukuma River Integrated Flood Management Project

3. PARTICULAR ITEMS OF THE PROJECT[5] LOCAL MUNICIPAL PROGRAMMES

41

[5] Local municipal programmes (1/2)

Abukuma River
Integrated FloodManagement Project

Every municipality is to perform local programmes in coordination with the other project items(Below are the plans of 10 municipalities in Fukushima Prefecture in the Abukuma Basin)- Further disaster risk reduction and flood fighting measures- Land-use related measures
Fukushima - Flood prevention measures- Strengthen disaster information sharing

City

Sukagawa
City

Date
City

Koori
Town

Otama
Village- Strengthen preparedness for disaster information transmission- Enhancement of the establishment and capacity building of
the voluntary disaster management organization- Add items on urban disaster risk reduction in the master planof city planning- Improvement of small tributaries- Hire an experienced person as a disaster risk reduction
specialist- Review and revising the disaster management plan tostrengthen disaster management capacity- Formulate an action guide for the voluntary disastermanagement organization- Improvement of the wireless-activated disaster warning
system for better transmission of evacuation information- Disaster management drills with the participation of local
residents assuming a flood disaster in the flood risk area
- Map exercises assuming the flood disaster using the flood
hazard map with local residents- Provide a lecture of new disaster alert levels (introduced in
March 2019) by meteorological observatory staffs- Convey drills adapting to the characteristics of each district toimprove disaster awareness among the local residents- Provide lectures on the disaster preparedness and disaster
response applicable to a variety of disasters, at gatherings oflocal communities or neighbourhood associations

Koriyama
City

Nihonmatsu
City

MotomiyaCity

KunimiTown

Tamakawa
Village- Improvement of small tributaries- Coordinated research with the Engineering Faculty of Nihon
University, located in the Koriyama City
- Enhancement of the establishment of the voluntary disastermanagement organization and formulation of the district-leveldisaster management plan
- Promotion of discussions with national and prefectural bodies
on disaster risk reduction around the confluences of the
Abukuma River and tributaries- Formulate integrated hazard maps considering various disasterrisks- Revision of the Local Disaster Management Plan based onrevised disaster hazard maps and detailed flood disaster
response plans (flood timelines)- Install a digital wireless-activated disaster warning system andtext broadcasting system for hearing-impaired persons- Disseminate the newly introduced disaster alert level, provide
a lecture at the community committee for disastermanagement and distribute flyers to all houses- Provide "Disaster Management Lecture" in district level by
specialists from the prefectural office on weather forecasts
and alerts, disaster alert levels and disaster preparedness, atdistrict disaster management drills- Carry out disaster management drills with the participation of
the residents assuming floods like those from Typhoon Hagibis
in the flood hazardous area
- Formulate disaster hazard maps and distributing them to all
the houses in the village- Designate proper evacuation shelters based on the local
disaster management plan
* Above includes achieved items as well.

42[5] Local municipal programmes (2/2)

Abukuma River
Integrated FloodManagement Project

Every municipality is to perform local programmes in coordination with the other project items(Below are the plans of 11 municipalities of Miyagi Prefecture in the Abukuma Basin)
Shiroishi
City

KakudaCity

IwanumaCity

Zao Town- Establishment of the volunteer disaster management
organization in 90% of all districts- Provide capacity building courses on volunteer disastermanagement organizations- Formulate flood and drainage hazard maps and distributethem to all the houses- Disaster management drill supposing mass flood disaster- Disseminate "My-timeline" to residents- Improvement of sandbag stations and stockpiles for
emergencies- Deepen discussion on the coordination with the volunteer
disaster management organization- Further coordination on strengthening drainage capacity with
relevant institutes- Review the timing and subject area of the evacuation orderand the establishment of the evacuation shelters- Dissemination of the proper action for evacuation
corresponding to the local situation- Enhancement of utilizing irrigation reservoirs for flood control- Further coordination on strengthening drainage capacity with
relevant institutes- Formulate flood hazard maps and distribute them to all houses- Start discussions on introducing "My-timeline" to all residents- Coordination for multilingualization of evacuation guide plates- Coordination with Shichikashuku Dam Management Office on
disaster information
Shichikashuku - Coordination with the prefecture on the excavation of sandTown
deposits in the riverbed* Above includes achieved items as well.

OgawaraTown

MurataTown

ShibataTown

Marumori
Town

WatariTown- Strengthen the volunteer disaster management organization- Publish a complementary document of flood hazard maps
- Consider purchase of rubber boats- Improvement of the stockpile for disasters- Drills with the residents supposing a flood disaster- Further coordination with the volunteer disaster management
organization to reduce disaster risk
- Increase and foster disaster management instructors- Enhancement of the emergency contact network taking into
consideration the elderly and disabled people- Development and distribution of the flood hazard map by thenext flood season- Provide lectures on the flood hazard maps
- Enhancement of dissemination of "My-timeline"- Consider the purchase of a drainage vehicle- Improvement of sandbag stations and stockpiles for
emergencies- Review the timing and inducement support at the evacuation
order on the occasion of Typhoon Hagibis- Community drills supposing flood disaster- Further coordination with national and prefectural institutes
on the improvement of drainage capacity- Enhancement of dissemination of "My-timeline"- Consideration of the "Whole Town Hazard Map"
- Review flood hazard maps to include a chronicle of theinundation caused by lack of drainage capacity- Discussion on the timing and subject area of the evacuation
order considering surrounding situations- Distribution of the flood and soil disaster hazard maps before
the next flood season
Yamamoto Lectures on "My-timeline" at the volunteer disastermanagement organization
Town

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