Measures to makeHorikawa River Limpid
Implementation by Nagoya CityFeb. 17th 2018
Greenification & Public Works Bureau
River Planning Division
Waterworks and Sewerage Bureau
Sewerage Planning Division㻝Points of the ReportTopics- Covering Riverbed with Sand
(From Habashita Bridge to Sakura Bridge)- Removing sludge at downstream ofShin-Horikawa River- Undertaking construction at Gojo Bridge Areaby registering 100mm/h Anshin Plan㻞Covering Riverbed with Sand
Expansion of covering sand section
Nagoya Castle

Scheduled construction section
Lentgh䠖1,100m
Expansion of covering sand section
from Habashita Bridge to Sakura Bridge

Habashita Bridge

Keiun Bridge
Gojo Bridge㻯㼘㼍㼞㼕㼒㼕㼏㼍㼠㼕㼛㼚㻌㼑㼤㼜㼑㼞㼕㼙㼑㼚㼠㼟㻌㼟㼑㼏㼠㼕㼛㼚㻌㼕㼚㻌㻞㻜㻝㻠䠄㻳㼛㼖㼛㻌㻮㼞㼕㼐㼓㼑䡚㻺㼍㼗㼍㻌㻮㼞㼕㼐㼓㼑䠅㻸㼑㼚㼓㼠㼔䠖㻟㻜㻜㼙Naka Bridge
Sakura Bridge
to Nagoya Station

Check point- Restraint of hoisting ofsluge at covering part
- Transparency of thewaterside- State of living things#HVGTGZRGTKOGPVU

Nishiki Bridge
Naya Bridge㻟Ṳ Covering Riverbed with Sand
The state of carrying sand on abarge in downstream ofKameya Brige

Shonai River’s sand㻠Ṳ Covering Riverbed with Sand

BeforeAfter'HHGEVQHQXGTNC[KPIUCPF
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OCNNCTF#UEJQQNQHUVTKRGFOWNNGV UHT[㻡ṲMeasures against Smell of Shin-Horikawa River
Horidome Water Treatment Center

Shinsuzaki Bridge
Maizuru
BridgeSynodic Mean Low Water (T.P.-1.4)

Ukishima Bridge

Ooi Bridge

Thickness:
About 2m

MukohdaBridgeTateishiBridgeHataya Bridge

ShinhoritaBridge

Shiratori Bridge

HinodeBridge

UchidaBridge

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Sumiyoshi Bridge

Nagoya Port

Shin-Uchida Bridge
TateishiBridge

OoiBridge

Riverbed of Shin-horikawa River after Removal of Sludge(Gradient: 1/10000)

Length of Sedimentary Sludge: about 400m

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Maizuru Bridge
Thickness:
About 0.8m

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Nakagawa Canal

Miyano-Watashi Port
(River confluence)

Horidome Water
Treatment Center

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Removingsludge…Location of Sedimentary Sludge㻢ṲMeasures against Smell of Shin-Horikawa River

State of dredgingĺĸDredging of sludge㻣Bank Protection Worksof the Horikawa River㻤Ṳ Improvement of Water Quality
䕺Removal of Sludge

Kurokawa AreaṞSludge have been dredged only on water route between theShiga Bridge and Shin-Horikawa River confluence (1994-2007)ṟRiver bed Excavation and removal of sludge are implemented
after bank protection works toward upstream from the riverconfluence.
Sludge of 150,000m3 have been removed in the past, and theremoving of sludge is continuing around the Oto Bridge.

Nagoya Castle

Nayabashi Area

OtoBridge㸸⌧ᅾࡢ᩿㠃SumiyoshiBridge

Dredging of Sludge on Water RouteShin-Horikawa RiverConfluence

Bank Protection WorksRiver Bed Excavation and Removalof Sludge at the same time㻥Ṹ100Ὣ/h Anshin Plan
• This plan describing efforts for secure lives ofresidents to reduce flood damage in residential
areas and urban areas triggered by torrential rains,implemented by River bureau and Sewage bureau
cooperatively with the participation of residents, theprivate sector and so on.
• 21 plans registered in Japan by Jan. 31st, 2018

Upsteram of Horikawa river wasregistered on Jan. 31st, 2018.
㻝㻜Ṹ100Ὣ/h Anshin Plan
Newly, The interval fromNishiki bridge to upstream ofnakatsuchido bridge wasregistered.

100䟚/hAnshinPlanThe launch of constructing
bank protection from Tenma
bridge to Sakura bridge isscheduled in the next fiscalyear.

㻝㻝Ṹ100Ὣ/h Anshin PlanĻFeb.13th 2018ĹChunichi NewspaperFeb.7th 2018㻝㻞ṲImprovement of water quality䕺㻹㼍㼗㼕㼚㼓㻌㼟㼔㼍㼘㼘㼛㼣㼟㻌㼍㼚㼐㻌㼐㼑㼑㼜㼟㻿㼑㼠㼠㼕㼚㼓㻌㼣㼛㼛㼐㼑㼚㻌㼜㼕㼘㼑㼟㻌㼍㼚㼐㻌㼞㼕㼜㼞㼍㼜㼟㻌㼓㼑㼚㼑㼞㼍㼠㼑㼟㻌㼢㼍㼞㼕㼍㼎㼘㼑㻌㼟㼠㼞㼑㼍㼙㻌㼛㼚㻌㼠㼔㼑㻌㼞㼕㼢㼑㼞㻌㼒㼛㼞㻌㼑㼚㼒㼛㼞㼏㼕㼚㼓㻌㼞㼕㼢㼑㼞䇻㼟㻌㼟㼑㼘㼒㻙㼜㼡㼞㼕㼒㼕㼏㼍㼠㼕㼛㼚㻌㼒㼡㼚㼏㼠㼕㼛㼚㻌㼍㼚㼐㻌㼏㼞㼑㼍㼠㼕㼚㼓㻌㼔㼍㼎㼕㼠㼍㼠㼟㻌㼣㼕㼠㼔㻌㼓㼞㼛㼣㼠㼔㻌㼛㼒㻌㼜㼘㼍㼚㼠㼟㻚…fish spawning andplants’ seed ashore…change of stream
Installed in 2016
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Some of the creatures seen in the upstream of Horikawa River

Pale chubBefore≋2012≌

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OUįNagoya Castle

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0CMCVUWEJK$TKFIGOU㻝㻡Implementation byWaterworks andSewerage Bureau㻝㻢ṲRemoval and reduction of inflow pollutants‫ ی‬Advanced water treatment
at the Meijo Water Treatment Center (since May 2010)
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3

After installation

3.3

2
1

ConsiderableReduction
Average: 1.0 or less1

1

Less than 12014

2015

2016

02007Ͳ09

Minute Suspended Solids (SS) in treated water are
removed more by the filtration devices.
㻝㻣Ṳ Removal and reduction of inflow of pollutants
䕺Control of combined sewer overflow
䠄Installation of advanced primary treatment facility䠅
Install advanced primary treatment facilities at maintained area by
combined sewer system in order to improve water quality of primary
treatment to be carried out in rainy weather.

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㻲㼕㼓㻚㻝㻌㻼㼞㼛㼏㼑㼟㼟㻌㼒㼘㼛㼣㻌㼕㼚㻌㼀㼑㼙㼙㼍㻙㼏㼔㼛㻌㼃㼍㼠㼑㼞㻌㼀㼞㼑㼍㼠㼙㼑㼚㼠㻌㻯㼑㼚㼠㼑㼞㻼㼕㼏㻚㻝㻌㻿㼜㼑㼏㼕㼍㼘㻌㼒㼕㼘㼠㼑㼞㻌㼙㼍㼠㼑㼞㼕㼍㼘㻝㻤ṲRemoval and reduction of inflow of pollutants
䕺Control of combined sewer overflow
䠄rainwater storage facility䠅Construct rainwater storage facilities to reduce pollution load for
Horikawa River in rainy weather by storing high polluted first flush
rainwater temporarily.
Ozone Storm water
Reservoir forpollution control

Horikawa Ugan
Rainwater
Reservoir forpollution control

Horikawa Sagan
Rainwater
Reservoir forpollution control

Started operation in 2006

Started operation in 2010
㸦13,000m3㸧

Scheduled to start
operation in 2018
㸦14,000m3㸧

㸦12,000m3㸧㻝㻥ṲRemoval and reduction of inflow of pollutants
䕺Horikawa Ugan
Rain-water Resevoir
for pollution control

Horikawa Ugan Rainwater
Reservoir for pollution control
Started operation in 2010
㸦13,000m3㸧

䞉㻿㼠㼍㼞㼠㼑㼐㻌㼛㼜㼑㼞㼍㼠㼕㼛㼚㼕㼚㻌㻿㼑㼜㼠㼑㼙㼎㼑㼞㻌㻞㻜㻝㻜䞉㻭㼎㼛㼡㼠㻌㻝㻟㻘㻜㻜㻜㼙㻟
Cumulative storedwater
volume in 2016
About 730,000ੑ

1DJR\D&DVWOH

Horikawa Sagan
Rainwater
Reservoir forpollution control
Scheduled to start
operation in 2018
㸦14,000m3㸧㻞㻜ṲRemoval and Reduction of inflow of pollutants
䕺Improvement of combined sewer system(Installation of Garbage Removal Device)㼀㼔㼑㻌㼍㼙㼛㼡㼚㼠㻌㼛㼒㻌㼕㼚㼟㼠㼍㼘㼘㼍㼠㼕㼛㼚㻌㼛㼒㻌㻳㼍㼞㼎㼍㼓㼑㻌㻾㼑㼙㼛㼢㼍㼘㻌㻰㼑㼢㼕㼏㼑㻌
TotalofPlan

Installed2017(Planned)

126

111

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Overflow

Wastewater
Treatment Plant

After

Garbage in sewerage
overflows together
with rainwater

Rainwater treated by thegarbage removal devices
overflow into river

Wastewater
Treatment Plant

Overflow

Removed garbage is treated at
Wastewater Treatment Plant
together with sewerage㻞㻝ṲRemoval and reduction of inflow of pollutants‫*ی‬DUEDJHFDWFKHU㸦1HDU-RKRNX%ULGJH VLQFHJDUEDJHEDVNHW

Sanage Bridge
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Nagoya Castle
Koshio Bridge
Naya Bridge

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