Horikawa Sen-nin Chosatai 2010th

Summary meeting for the 15 stage

The ｓecretariat of Horikawa Sen-nin Chosatai 2010
Sep.27th.2014

Photos：Goyousui-ato-gaien-aigokai
Survey Group
KawasemiSurvey Group１

Horikawa Sen-nin Chosatai 2010
～Transmission of Raw Water from
Kiso Riveｒ～
1.Purpose
To verify the clarification effects of TRWKR with
Citizens(1)Develop to new clarifying measures(2)Asses the influence on an ecosystem(3)Sustain and enhance citizens’ activities.
(4)Develop citizens’ awareness in the entire
Horikawa river basin
2.Water source and Volume of transmissionof raw water(1)Water source : Kiso River(2)Volume of transmisission of raw water:Maximum 0.4 m3/s
3.Pilot project period(1)Evaluation and Survey term : About 5 years（from Apr.2007 to Mar.2012）(Including the term of follow-up survey andevaluation after the stop of TRWKR)(2)TRWKR period : about 3years(from Apr.22nd 2007 to Mar.22nd 2010)■Increase of Transmisson Volume
from the Shonai River(additional pilot project）(1)Water Source Shonai River(2)Transmission Usual 0.4m3/sec (maxium 0.7m3/sec)(3)Experiment Period ：1st Oct-31St 2010(4)Period of Increased Transmision
Volume :Oct .5th-Nov.2nd 2010

The formation of HSC (April 22nd 2007)
With a viewpoint and a sence of citizens, the survey ofthe clarification effect of TRWKR started■ The survey from a view point and a sence of citizens＊Clearness ＊Transparency ＊Color ＊Smell＊Garbage ＊ Living things ,etc

The first Nagoya City Environmental practice Prize February.2012
Branch of contribution for Regional Environment Development
Award for excellence２Transmission of Raw Water from Kiso River
3 years from April 22nd, 2007（Stopped on March 22nd,2010）
To verify the clarification effects of TRWKR
Surveys during TRWKR period :■ Role of the survey group
April 2007 ～ March 2010(Conclusions of Summary Meeting for the 10th Stage)
Surveys after the stop of TRWKR① More surveys should be implemented.
Continuity of investigation, Clarification of
the situation of the river, identification of
cause of pollution in the river, are needed.

Horikawa Sen-nin Chosatai
April 2007～March 2012
■ Fixed Point Observation Groups
Surveying effects of TRWKR■ Free Survey Groups
Researching Horikawa River by free themes■ Horikawa Cheering Groups
Cheering clarification of Horikawa

To verify the clrification effectsof TRWKR

The survey from aview point and a
Ts ofsence of citizens■ It was confirmed that the water quality tended to improve
during TRWKR between Sanage Bridge and Matsushige Bridge.
■ Network of citizens who wish for clarification andrestoration of Horikawa River expanded.
■ Citizens’ awareness of cleaning of the river wasdeveloped

We will make a improvement plan and takeaction against the pollution.
After that, citizens and public
administration will do what is possible toclean the river.
② There are many things that citizens cando. We will expand the circle of partners
who love Horikawa River and hope TRWKR.
We will deepen exchanges with people
living in the basin of Kiso, Nagara, and Ibi
River.
We will check the effects of pollution
removal from domestic wastewater andimplement it in each house.

３

Water Environment of Horikawa River
Area of basin ：51.9km2
Length ：16.2km
The water source we use is Kiso River

Change in temperature, precipitation and length of daylight
Cause of breedingof phytoplankton,
nitorogen andphosphorus areincluded inwastewater fromhouses, factories
and stores.
It has looked like redtide or blue tide.
In Nagoya Port anddownstream ofHorikawa, it is said
that phytoplankton
does over breedingand extinction, so
water basin ispolluted
rad tide

The primary cause of water pollution is
wastwater from houses,factiories and stores.
Wastwater is discharged after treatment in wastwater treatment plant.
●●●

When heavy rain, wastewater isdischarged without treatment.

●●●

●●●

Shonai River
Provisional raw watertransmission ：0.3m3/s

●●●

●●●

●●●

Wastewater
Treatment Plant

Tide Gate▼high tide●●● ●●●Sanage Bridge

Motoiri Sluiceway

Horikawa▼ebb tide Difference of water level is more than 2m between high tide and edd tide.
Water level, direction of current and velocity are changed by tide.
Nagoya Port

Shimizu wakuwaku-sui

risingGround water etc

Ise bay
Sludge rises and floats.
blue tide

floating sludge

raised sludge

４Inxestigation spots

Network of citizens who wish forclarification and restoration ofHorikawa River is growing.

Number of Participants of Horikawa
Sen-nin Chosatai 2010
(Horikawa Sen-nin Chosatai started
accepting participation on 26th Mar .2007)

Start

Now

22nd Apr.2007

27ｔｈ Sep.2014

Fixed Point
Observation
Groups55 groups
497persons

95 groups
980persons

Free Survey
Groups22ｇroups
234persons

40 groups
650persons

Horikawa
Cheering
Groups88ｇroups
1,531persons

2,514 groups
49,938persons

Total

165ｇroups
2,262persons

2,652 groups
51,568persons

５Number of Participants ofHorikawa Sen-nin Chosatai
Growth of participants
60,00050,00045,00040,00035,00030,00025,000

定点観測隊

自由研究隊

応援隊

全隊

Total 51,568persons

Fixed Point Observation Groups 980persons
Free Survey Groups 650persons
Horikawa Cheering Groups 49,938persons
第1ステージ 第3ステージ
第2ステージ

第5ステージ

第4ステージ

第7ステージ

第6ステージ

第9ステージ

第8ステージ

第11ステージ 第13ステージ 第15ステージ

第10ステージ 第12ステージ

第14ステージ

20,00015,00010,000

5,000
0
H19.4
H19.6
H19.8
H19.10
H19.12
H20.2
H20.4
H20.6
H20.8
H20.10
H20.12
H21.2
H21.4
H21.6
H21.8
H21.10
H21.12
H22.2
H22.4
H22.6
H22.8
H22.10
H22.12
H23.2
H23.4
H23.6
H23.8
H23.10
H23.12
H24.2
H24.4
H24.6
H24.8
H24.10
H24.12
H25.2
H25.4
H25.6
H25.8
H25.10
H25.12
H26.2
H26.4
H26.6
H26.8
H26.10
H26.12
H27.2

Number of Participannts

55,000Month and Year
September 27th .2014

６

Method of fixed-point observation
Transparency
Meter
100 cmMeasurement oftransparency

Photo: Shinko Survey Group

What is your
Impression of ・・・
cleanness?
Transparent?
Color?
Bubbles?
Smell?
Garbage?
Living things?

Measurement of COD
Chemical Oxygen Demand. This is
an index of water contamination
used for sea, lakes and marshes.
It is an oxygen consumption
required for oxidation of organic
matters dissolved in ample water.
The higher COD, the more it iscontaminated.

COD pack test

Yurinokai Survey Group
photo:Goyosui-ato-gaien-aigokai
Survey Group

Photo: Goyosui-ato-gaien-aigokai Survey GroupSurvey Period and Number of Reports
Survy Period

With TRWKR

Introduction of advanced water
treatment at the Meijo Water
Treatment Center
In-service of Horikawa
Ugan Rain-water Reservoir
for pollution control
Utilization of reclaimed
wastewater from Moriyama
Water Treatment Centerfrom Apr. to Oct.

Utilization of reclaimed wastewater from
Moriyama Water Treatment Center stopped in15th stage due to construction for the
improvement. ( from April to October 2014)Total

1st stageinterval
2nd stageinterval
3rd stageinterval
4th stageinterval
5th stageinterval
6th stageinterval
7th stageinterval
8th stageinterval
9th stageinterval
10th stage
interval
11th stage
interval
12th stage
interval
13th stage
interval
14th stage
interval
15th stage

Sping - Early Summer/Apr. 22nd - Jun. 30th.2007
Jul.1st - Sep. 7th. 2007
Autumn - Early Winter/Sep. 8th - Dec. 16th.2007
Dec.17 2007 - Mar. 31st. 2008
Sping - Early Summer/Apr. 1st - Jun. 30th.2008
Jul.1st - Sep. 27th.2008
Autumn - Early Winter/Sep. 28th - Dec. 16th.2008
Dec.17th 2008 - Mar. 31st.2009
Sping - Early Summer/Apr. 1st - Jun. 30th.2009
Jul.1st - Sep. 26th.2009
Autumn - Early Winter/Sep. 27th - Dec. 16th.2009
Dec.17th 2009 - Mar. 31st.2010
Sping - Early Summer/Apr. 1st - Jun. 30th.2010
Jul.1st - Sep. 11th.2010
Autumn - Early Winter/Sep. 12th - Dec. 17th.2010
Dec.18th 2010 - Mar. 31st.2011
Sping - Early Summer/Apr. 1st - Jun. 30th.2011
Jul.1st - Sep.10th.2011
Autumn - Early Winter/Sep. 11th - Dec. 16th.2011
Dec.17th 2011 - Mar. 31st.2012
Sping - Early Summer/Apr. 1st - Jun. 30th.2012
Jul.1st - Sep. 21th.2012
Autumn - Early Winter/Sep. 22nd - Dec. 16th.2012
Dec.17th 2012 - Mar. 31st.2013
Sping - Early Summer/Apr. 1st - Jun. 30th.2013
Jul.1st - Sep. 28th.2013
Autumn - Early Winter/Sep. 29th - Dec. 17th.2013
Dec.18th 2013 - Mar. 31st.2014
Sping - Early Summer/Apr. 1st - Jun. 30th.2014

Numberof
Reports
258
134
383
103
245
64
152
100
145
54
120
81
111
44
104
72
112
42
133
77
148
60
139
92
145
70
113
79
133
3,513

８

Number of Reports

The total number of reports about survey results is 3,513 at the end of the15th stage.
On average, the number of surveys is 400 every year.
A lot of citizens survey the true state of water environment of Horikawa River continually from a view
point and sense of citizens.

９

Weather Condition

Japan Meteorological Agency, weather statistics
information at Nagoya Local Meteorological Agency
http://www.jma.go.jp/jma/menu/report.html

From April to June of the 15th stage, it was highertemperature, less precipitation, and long hours of sunshine thannormal. The temperature in June was especially high, and theprecipitation in June was very little.
■ Temperature

Nagoya Local Meteorological Agency: average value

・The average temperature of the 15th stage was about １℃ higher
than normal. That of each month was higher than normal, too.
Especially in June, it was about 1.7℃ higher than normal.
■ Precipitation
・ The average precipitation of the 15th stage was about 50mm lessthan normal. Especially, that in June was 72mm, it was 35% of normal.

■ Hours of sunlight・The hours of sunlight of the 15th stage were about 50 hours longer
than normal. That of each month was longer than normal, too.
Especially in May, it was 137% of normal.

SectionStatistics
data period
Years of data

April
May
June
average
September
OctoberNovember
Decemberaveragetotal
rainfall
(mm)
1981
～2010
30
143.3
155.7
201.5
166.8
234.4
128.3
79.7
45.0
121.9

temperature(℃)
average
1981
～2010
30
14.1
18.5
22.3
18.3
24.1
18.1
12.2
7.0
15.4

max
1981
～2010
30
19.5
23.7
26.7
23.3
28.6
22.8
17.0
11.6
20.0

minimum
1981
～2010
30
9.2
14.0
18.7
14.0
20.7
14.1
8.1
3.1
11.5

total
hours ofsunlight
1981
～2010
30
188.4
199.6
145.2
177.7
151.0
169.0
162.7
172.2
163.7

temperature
Apr. – Jun. Normal(1971 - 2000)
Average18.3 degrees C

1℃ higher than normal

The average temperature of each month was higher than normal, too.
Especially in June, it was 1.7℃ higher than normal.

１０

Weather Condition

Japan Meteorological Agency, weather statistics
information at Nagoya Local Meteorological Agency
http://www.jma.go.jp/jma/menu/report.html

precipitation

Apr. – Jun. Normal(1971 – 2000)
Average166.8mm

Only 35 percent of normal.

50mm less than normal.

hours of sunlight
Apr. – Jun. Normal(1971 - 2000)
Average 177.7H

50 hours longer than normal.

The hours of sunlight of each month was longer than normal,
too. Especially, it was 137 percent of normal in May.

１１

Main Measures for Water Quality Improvement
平成19年度Measures実施施策

平成20年度

1st.

平成21年度

3st.
2st.

5st.
4st.

平成22年度

平成23年度

7st.
6st.

9st.
8st.

平成24年度

平成25年度

平成26年度

11st.

13st.

15st.

10st.

14st

12st.

With TRWKR(0.4m3/s)/s)
木曽川からの導水(0.4m
3

3Increase of raw water transmission
庄内川からの導水の増量(＋0.4m/s) from the Shonai River (＋0.4m3/s)

Introduction of Advanced water treatment at the Meijo Water Treatment Center
名城水処理センター高度処理の導入
In-service of the Horikawa Ugan Rain-water Reservoir for pollution control
堀川右岸雨水滞水池の供用
守山水処理センターの下水再生水
Utilization of reclaimed wastewater from the Moriyama Water Treatment Center (0.046m3/s)の活用(0.046m3/s)
Utilization of reclaimed wastewater at Moriyama
Water Treatment Center was stopped during
the15th stage because of construction work forthe improvement(from April to October, 2014).

木曽川からの導水が停止した後に新たに稼動した施設
Newly launched facilities after the stop of TRWKR
For improvement of quality of treated water
For improvement of combined sewer system(Additional filtration of treated water at the(Storing first flush with high pollution load to
Meijo Water Treatment Center can improve
restrain outflows temporarily)
quality of water discharging into Horikawa River )

⑤

⑥

④

③

②
①

Advanced water treatment
at Meijo Water Treatment Center
Solution : conventional activated sludge
process and rapid filtration
Launch : May. 2010

The Horikawa Ugan Rain-water Reservoir forpollution control
Volume : 13,000m3
Coverage area : 633ha
Launch : Sep. 2010

・Improvement of combined sewer system•Construction of water storage facility
凡例

Completed
対策済み区域
Under
construction
建設中の区域

１２

Newly launched facilities after the stop of TRWKR■Securement of Additional Water Resource
Utilization of Reclaimed WastewaterMoriyama Water
Treatment Center

Conducting reclaimed wastewater treated bymembrane filtration at the Moriyama Water
Treatment Center (up to 4000m3/day) is discharged
into Horikawa River.

Newly installed
pipeline

Start to conduct in Aug. 2011

Shonai
Irrigation

Conducting point into
Horikawa River
Reclaimed wastewater is conductedduring irrigation season (Apr - Oct)

Horikawa
River
Kita Ward
Reference ： 10th Horikawa Sennin Chosatai conference

13Column“To clarify and restore the Horikawa River”
Horikawa Sen-nin Chosatai 2010 made a start as a place for citizens’ activities to clarify and restore
Horikawa River on April 22nd, 2007.
There are 95 Fixed Point Observation Groups, which are continuously investigating actual condition ofwater quality, and cause of pollution. And there are also 40 Free Survey Groups and 2,517 Horikawa
Cheering Groups. There are 51,568 persons on the list as of Sep 27, 2014.
The fixed point observations had been carried out 3,513 times by the end of the 15th stage. They
turned out what makes citizens’ impression about water quality of the Horikawa River.
Pilot project for clarification of the Horikawa River (from April 2007 and March 2012)
The pilot project of TRWKR (Transmission of Raw Water from the Kiso River) showed the water
quality improvement between Sanage Bridge and Matsushige Bridge.
After TRWKR stopped, advanced water treatment at the Meijo Water Treatment Center
was introduced and the Horikawa Ugan Rain-water Reservoir was launched.
Moreover, reclaimed wastewater treated by membrane filtration at the Moriyama Water
Treatment Center was discharged into the Horikawa River.

１４

Feature of the 15th stage (April - June, 2014)
Higher temperature and less precipitation through 15th stage presented in water color of the
Horikawa River notably.
“Water colored greenish-brown and brown” was reported by Shirotori Taifu Goryo Bridge survey
group, Kojo-Horikawa-to-Seikatsu-wo-Kangaeru-kai survey group and Kawasemi survey group in
April. It is thought to be the influence of red tide.
Whiten or grayish colored waters were often reported in the other period. These clouds arethought to have been caused by particles of sulfur in the water, generated from sulfate−reducing
bacteria activities in the condition of poor oxygen.

Furthermore, Kojo-Horikawa-to-Seikatsu-wo-Kangaeru-kai survey group reported “water near
Nayabashi Bridge was colored deep black”, middle in May. It is thought to be the influence ofwinding up of sludge from the bottom of water by tidal effect.
In the 15th stage, Fixed Point Observation Groups investigated various conditions, and they
could be able to distinguish the regular fluctuations and irregular fluctuations, so it’s generating
mechanism of these phenomena would be made clear.
It gradually become almost clear about the mechanism of these phenomena by distinguishing theregular fluctuations and irregular fluctuations because Fixed Point Observation Groups
investigated various conditions in the 15th stage.

１５

１．Impression of Water Clearness
Upstream Area

The ratio of “Clean”, “Slightly clean” and “Ordinary”
Note） Not enough data.

The 1st-6th stage ： With TRWKRNo rain on the day and the previous day
The 7th-15th stage： No TRWKRNo rain on the day and the previous day
Utilization of reclaimed wastewater at Moriyama
Water Treatment Center was stopped during
the15th stage because of construction work forthe improvement(from April to October, 2014).

（Between Sakae Brdg. and Sanage Brdg. _ Average）
With TRWKR

Water Clearness(%)
Impression of水の汚れの印象（％）

Introduction of advanced water treatment at Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservior for pollution control
25 out of 31 times surveys were carried out on June 27th Between Sakae Brdg. Utilization of reclaimed wastewater at Moriyama Water Treatment Center
栄橋～猿投橋間(at Kizune Bridge), and “Slightly dirty” was seen a lot.
and Sanage Brdg.
100
100
100
100
100
100
100
100
100
93
87
87
75

80
60

60

40

50
39

Horikawa upstream area is mostly
in the acceptable range for citizens

20(The ratio of “Clean”, “Slightly clean” and “Ordinary” is mostly 100%)
H19.9.8～12.16

H20.4.1～6.30

H20.9.28～12.16

H21.4.1～6.30

H21.9.27～12.16

H22.4.1～6.30

H22.9.11～12.17

H23.4.1～6.30

H23.9.11～12.16

H24.4.1～6.30

H24.9.22～12.16

H25.4.1～6.30

H25.9.29～12.17

H26.4.1～6.30

Numberof data

H19.4.22～6.30

0

第1st.

第2st.

第3st.

第4st.

第5st.

第6st.

第7st.

第8st.

第9st.

第10st.

第11st.

第12st.

第13st.

第14st.

第15st.

31

41

15

2

8

3

5

8

5

9

9

8

8

7

7

Note） Not enough data.

■ How did the impression of water clearness change in Horikawa upstream area
(between Sakae Brdg. and Sanage Brdg.)?
→Although we don’t have enough data, the ratio of water cleanness impression changes mostly in theacceptable range for citizens.
＊“Clean”, “Slightly clean” and “Ordinary” are categorized as the acceptable range for citizens.

１６

Impression of Water Clearness

Middle and
The ratio of “Clean”, “Slightly clean” and “Ordinary”
Downstream Area Note）Except the data between Oseko Brdg. and Minatoshin Brdg. for not enough data
（Between Sanage Brdg. and Oseko Brdg. _ Average）
With TRWKR

The 1st-6th stage ： With TRWKRNo rain on the day and the previous day* The 7th-15th stage： No TRWKRNo rain on the day and the previous day
Utilization of reclaimed wastewater at Moriyama
Water Treatment Center was stopped during
the15th stage because of its improvement
construction(from April to October, 2014).

Introduction of advanced water treatment at Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservior for pollution control

Impression of Water Cleanness(%)

Utilization of reclaimed wastewater at Moriyama Water Treatment Center

Numberof dataWith TRWKR
Improved

113

208

176

52

According to the survey,
the acceptable range forcitizens(“Clean”, “Slightly
clean” and “Ordinary”) is
about 30%.

No TRWKR
Worsened

111

63

85

67

Improved

76

113

113

98

93

81

89

■How did the impression of water clearness(from spring to early summer) change in the middle and downstream of Horikawa River(between Sanage Brdg. and Oseko Brdg.)?
→Improving trend was seen (the ratio of “Clean”, “Slightly clean” and “Ordinary” was decreased) during transmission. In the 7th stage after the stop of TRWKR,
impression of water cleanness was worsened. However, impression of water clearness was improved after that. It is considered that these trends are made by
the effect of new water quality improvement measures. The ratio of “Clean”, “Slightly clean” and “Ordinary” was about 30% in the 15th stage.
＊“Clean”, “Slightly clean” and “Ordinary” are categorized as the acceptable range for citizens.

１７

The 1st-6th stage ： With TRWKRNo rain on the day and the previous day
The 7th-15th stage： No TRWKRNo rain on the day and the previous day

Impression of Water Clearness（Area Average）
The ratio of “Clean”, “Slightly clean” and “Ordinary”

Utilization of reclaimed wastewater at Moriyama
Water Treatment Center was stopped during the15th stage because of its improvement
construction(from April to October, 2014).

Note）Except the data between Minatoshin Brdg. and Oseko Brdg.
for not enough data

Utilization of reclaimed wastewaterat Moriyama Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservior for pollution control

With TRWKR(Evaluation Area)

Introduction of advanced water treatment at Meijo Water Treatment Center

Unit：％

Btwn. Sakae Brdg.
and Sanage Brdg.
（Not enough data）

80

80

80

80
60

60
40

Btwn. Sanage Brdg.
and Johoku Brdg.

40

40
60

40

Btwn. Johoku Brdg.
and Asahi Brdg.

20
40

20

20

With TRWKR
20

Btwn. Asahi Brdg.
and Matsushige Brdg.

40

With new water quality
improvement measures→Improved

After the stop of TRWKR→Worsened

20
20
40

Btwn. Matsushige Brdg.
and Oseko Brdg.

20

40

40

第1st.

第2st. 第3st. 第4st. 第5st. 第6st. 第7st.

40

第8st. 第9st. 第10st. 第11st. 第12st. 第13st. 第14st. 第15st.

％（Dirty）％（Clean）＊“Clean”, “Slightly clean” and “Ordinary” are categorized as the acceptable range for citizens.

１８

Impression of Water Clearness(Area Average)
From Spring to Early Summer

The 1st・3rd・5th stage ： With TRWKRNo rain on the day and the previous day
The 7th・9th・11th・13th・15th stage ： No TRWKRNo rain on the day and the previous day

The ratio of “Clean” , “Slightly Clean” and “Ordinary”*

松重橋～朝日橋
Btwn. Asahi
Brdg. and Matsushige Brdg.

城北橋～猿投橋
Btwn. Sanage
Brdg. and Johoku Brdg.
of Water cleanness(%)
Impression水の汚れの印象（％）

Improved

80
60

53

50

43

40

40

29

0

23

16

20

56

of Water cleanness(%)
Impression水の汚れの印象（％）

Improved between Sanage Brdg.100and Matsushige Brdg.

100

80
60

Improved

40

23
20
0

11
0

12

5

H19.4.22～6.30 H20.4.1～6.30 H21.4.1～6.30 H22.4.1～6.30 H23.4.1～6.30 H24.4.1～6.30 H25.4.1～6.30 H26.4.1～6.30

第1ｓｔ. 第3ｓｔ. 第5ｓｔ. 第7ｓｔ. 第9ｓｔ. 第11ｓｔ.第13ｓｔ. 第15ｓｔ.

第1st.
第3st.
第5st.
第7st.
第9st.
第11st.
第13st.
第15st.
第1ｓｔ.
第3ｓｔ.
第5ｓｔ.
第7ｓｔ.
第9ｓｔ.
第11ｓｔ.
第13ｓｔ.
第15ｓｔ.

第1st.

第3st.

第5st.

第7st.

第9st.

第11st.

第13st.

第15st.

37

42

30

24

20

27

16

16

Numberof data46Note） Not enough data

80

Improved
60

40

36

40

23
20

21
12

8

14

0
H19.4.22～6.30 H20.4.1～6.30 H21.4.1～6.30 H22.4.1～6.30 H23.4.1～6.30 H24.4.1～6.30 H25.4.1～6.30 H26.4.1～6.30

of Water cleanness(%)
Impression水の汚れの印象（％）

100

37

25

22

43

35

34

100
80
60
40

第1st.

第3st.

第5st.

第7st.

第9st.

第11st.

第13st.

第15st.

12

14

13

6

9

14

7

5

27

20
0

12

18

16

22

20

6

3

H19.4.22～6.30 H20.4.1～6.30 H21.4.1～6.30 H22.4.1～6.30 H23.4.1～6.30 H24.4.1～6.30 H25.4.1～6.30 H26.4.1～6.30
第1st.
第3st.
第5st.
第7st.
第9st.
第11st.
第13st.
第15st.
第1ｓｔ.
第3ｓｔ.
第5ｓｔ.
第7ｓｔ.
第9ｓｔ.
第11ｓｔ.
第13ｓｔ.
第15ｓｔ.

第1ｓｔ. 第3ｓｔ. 第5ｓｔ. 第7ｓｔ. 第9ｓｔ. 第11ｓｔ.第13ｓｔ. 第15ｓｔ.
Numberof data

82

大瀬子橋～松重橋
Btwn. Matsushige
Brdg. and Oseko Brdg.

朝日橋～城北橋
Btwn. Johoku
Brdg. and Asahi Brdg.
of Water cleanness(%)
Impression水の汚れの印象（％）

24

H19.4.22～6.30 H20.4.1～6.30 H21.4.1～6.30 H22.4.1～6.30 H23.4.1～6.30 H24.4.1～6.30 H25.4.1～6.30 H26.4.1～6.30

Numberof data028

21

Numberof data

15

33

29

30

25

27

The impression of water clearness in the 15th stage has improved between Sanage Brdg. and Matsushige Brdg. compared with just after the stop of
TRWKR(the 7th stage).
The ratio of “Clean”, “Slightly clean” and “Ordinary” was higher in the upstream area. The ratio between Sanage Brdg. and Johoku Brdg. was over
50%. On the other hand, the ratio between Matsushige Brdg. and Oseko Brdg. was less than 10%.

35

34

１９

The 1st・3rd・5th stage ： With TRWKRNo rain on the day and the previous day
The 7th・9th・11th・13th・15th stage ： No TRWKRNo rain on the day and the previous day

Evaluation of Water Clearness Impression
From Spring to Early Summer

Between Sanage
Brdg. and Minatoshin Brdg.
猿投橋～港新橋
10%

20%

30%

40%

50%

60%

Utilization of reclaimed wastewater atMoriyama Water Treatment Center

In-service of Horikawa Ugan Rain-water
Reservior for pollution control

80%

第３ステージ58

3

第５ステージ54

822

第７ステージ53

13

14

第９ステージ50
59

第１３ステージ

61

第１５ステージ

60

Color
①色

Smell
②におい

18

9

第１１ステージ

Utilization of reclaimed wastewater at Moriyama
Water Treatment Center was stopped during
the 15th stage because of its construction for
the improvement(from April to October, 2014).

70%

90%

100%

survey第１ステージ No
調査なし

第１ステージ

Introduction of advanced water treatment
at Meijo Water Treatment CenterWith TRWKR

0%Transparency
③透明感

7
3
Garbage ⑤あわBubble④ごみ

調査数１７３3 1 Numberof data

17
15

1
42

14

Number
調査数１１０of data
Number
調査数８４
of data24

16

1

Number
調査数７５
of data22

18

1

Number
調査数１１３of data14

1

Number
査数９２
of調data

7 1

Number
査数８７
of調data

17
29

Living things⑥生き物の様子

Others⑦その他Note） 0% items are not displayed.

■ How did the evaluation of water clearness impression change?
→High ratio items of the water clearness evaluation were “Color”,“Transparency” and “Garbage”.
The ratio of “Color” has increased and that of “Garbage” has decreased
after the stop of TRWKR.

２０Evaluation of Water Clearness Impression
From Spring to Early Summer Between Sanage Brdg. and Minatoshin Brdg.
With TRWKR

Introduction of advanced water treatment at Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservior for pollution control
Utilization of reclaimed wastewater at Moriyama Water Treatment Center

The criterion for evaluation when people answered “Clean”, “Slightly clean” and “Ordinary”.
②におい
Smell

①色
Color

③透明感
Transparency④ごみ
Garbage⑤あわBubble⑥生き物の様子Living things⑦その他
OthersWith TRWKR
of the Impression _ The ratio(%)
Evaluation 印象の評価_構成比（％）

100%

2%
11%

90%

4%

7%
21%

26%

70%

“Transparency” accounted for about 70%of the evaluation in the 15th stage.

50%

45%

60%

2%

40%

72%

42%

45%

55%

50%

7%
70%

30%

6%

3%

40%

36%

32%

21%

22%

第３ステージ
第3ステージ

第５ステージ
第5ステージ

第７ステージ
第7ステージ

第９ステージ
第9ステージ

第１１ステージ
第11ステージ

47

33

9

14

27

No data■ What is the item toevaluate “Clean”, “Slightly
clean” and “Ordinary”?

5%

11%

20%

22%

0%

Numberof dataUtilization of reclaimed wastewater atMoriyama Water Treatment Center was
stopped during the 15th stage because of
its construction for the improvement(from April to October, 2014).

21%

22%

80%

10%

The 1st・3rd・5th stage ：With TRWKRNo rain on the day and the previous day
The 7th・9th・11th・13th・15th stage ：No TRWKR
No rain on the day and the previous day

第１ステージ
第1ステージ

第１３ステージ
第１５ステージ
第13ステージ
第15ステージ

19→“Transparency” accounted forabout 70% in the 15th stage.

18“The criterion for evaluation when people answered “Slightly dirty” and “Dirty”.
①色
Color

②におい
Smell

③透明感
Transparency④ごみ
Garbage⑤あわBubble⑥生き物の様子Living things⑦その他
OthersWith TRWKR
of the Impression _ The ratio(%)
Evaluation
印象の評価_構成比（％）

100%

5% 1%

90%
80%
70%

1%
13%

19%

8%

8%

10%
4%

60%

4%

3%

13%

2%
18%

1%
22%

12%

1%

11%
11%

18%

13%

9%

1%

17%

7%

■ What is the item to evaluate“Slightly dirty” and “Dirty”?
→“Color” accounted for about
70% in the 13th and 15thstages.

3%

21%

10%

50%
40%
63%

30%

68%

52%

20%
10%

69%

70%

56%
“Color”
accounted for about 70%of the evaluation in the 13th and 15th stages.

56%Note） 0% items are not displayed.

No data0%

Numberof data

第１ステージ
第1ステージ

第３ステージ
第3ステージ

第５ステージ
第5ステージ

第７ステージ
第7ステージ

第９ステージ
第9ステージ

第１１ステージ
第11ステージ

第１３ステージ
第13ステージ

第１５ステージ
第15ステージ

127

77

75

61

86

73

69

２１

２． Change in Transparency
Measuring transparency（For reference） The 9th survey meeting
Relationship between the Impression of Water Cleanness
and the Average of Transparency
The 2nd-9th stage (No rain) : Including out-of period data
Water clearness impression evaluated by translucency
All sections(including upstream area)

Photo: Shinko Survey Group

透視度(cm)、透明感で評価

Photo: Goyousui-ato-gaien-aigokai
Survey Group

Transparency(cm) _ Evaluated by translucency

Relationship 水の汚れの印象と透視度(透明感）の関係
between Water Cleanness Impression and Transparency

100“Clean”, “Slightly clean” and “Ordinary” arecategorized as the acceptable range for citizens.

80

72

86

60

82
65

63

Over 70cm
transparency

40

y = -6.3x + 92.5
R2 = 0.9606

20
0
0

1
きれい
Clean

Slightly
やや
どちらとも
2
3
Ordinaryclean
きれい いえない

Slightly
やや
4
dirty
きたない

5
きたない
Dirty

Water clearness
impression _ Evaluated by translucency
水の汚れの印象_透明感で評価

Acceptable range for citizens：Over 70cm transparency

２２

The 1st～6th stage： with TRWKRNo rain on the day and the previous day
The 7th～15th stage： No TRWKRNo rain on the day and the previous day

Change in Transparency

Upstream Area

Utilization of reclaimed wastewater at Moriyama
Water Treatment Center was stopped in the 15thstage because of the construction work for the
improvement(April to October,2014).

Average (from Sakae Bridge to Sanege Bridge)
With TRWKR

Introduction of advanced water treatment at the Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservoir for pollution control
Utilization of reclaimed wastewater at Moriyama Water Treatment Center

100
88

86

85

透視度(cm)Ｔｒａｎｓｐａｒｅｎｃｙ（ｃｍ）

80

79

80
63
60

57

64

62

59

55

71

67

55

Over 70cm in the upstreamof Horikawa River after the 12th stage

42
40

20

H19.9.8～12.16

H20.4.1～6.30

H20.9.28～12.16

H21.4.1～6.30

H21.9.27～12.16

H22.4.1～6.30

H22.9.11～12.17

H23.4.1～6.30

H23.9.11～12.16

H24.4.1～6.30

H24.9.22～12.16

H25.4.1～6.30

H25.9.29～12.17

H26.4.1～6.30

Numberof data

H19.4.22～6.30

0

第1st.

第2st.

第3st.

第4st.

第5st.

第6st.

第7st.

第8st.

第9st.

第10st.

第11st.

第12st.

第13st.

第14st.

第15st.

3

41

13

2

8

3

5

8

5

9

9

7

8

7

7

Note） Not enough data

■ How did the transparency in the upstream of Horikawa River (Sakae
bridge～Sanage bridge) change?
→There are not enough data, but transparency after the 12th stage have been over
70cm (civil acceptable value).

２３

Middle andDownstream Area

Change in Transparency

Utilization of reclaimed wastewater at Moriyama
Water Treatment Center was stopped in the 15thstage because of the construction work for
improvement (April to October,2014).

Average (from Sanage Bridge to Oseko Bridge）
With TRWKR

Introduction of advanced water treatment at the Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservoir for pollution control

Improved with TRWKR

Utilization of reclaimed wastewater at Moriyama Water Treatment Center

100
83

82
76

透視度(cm)Ｔｒａｎｓｐａｒｅｎｃｙ（ｃｍ）

80

60

Worsened
without 72TRWKR

61

60

57

The 1st～6th stage： with TRWKRNo rain on the day and the previous day
The 7th～15th stage： No TRWKRNo rain on the day and the previous day

72

59

Keeping
or73
73
improved a little 59
58

56

52

40

20

H19.9.8～12.16

H20.4.1～6.30

H20.9.28～12.16

H21.4.1～6.30

H21.9.27～12.16

H22.4.1～6.30

H22.9.11～12.17

H23.4.1～6.30

H23.9.11～12.16

H24.4.1～6.30

H24.9.22～12.16

H25.4.1～6.30

H25.9.29～12.17

H26.4.1～6.30

Numberof data

H19.4.22～6.30

0

第1st.

第2st.

第3st.

第4st.

第5st.

第6st.

第7st.

第8st.

第9st.

第10st.

第11st.

第12st.

第13st.

第14st.

第15st.

55

155

129

36

95

61

77

64

73

108

107

84

90

81

79

■ How did the transparency in the downstream of Horikawa River (Sanage bridge～Oseko
bridge) change? →We monitored improving trend with TRWKR and worsening trend in the 7th stage without
TRWKR. However, we monitored slightly improving trend again after the 11th stage. . It is considered that thesetrends are made by the effect of the new water quality improvement measures. Transparency from autumn toearly winter is over 70cm which is civil acceptable value. On the other hand, that from spring to early summer is

２４The 1st～6th stage： with TRWKRNo rain on the day and the previous
The 7th～15th stage： No TRWKRNo rain on the day and the previous

Change in Transparency
Utilization of reclaimed wastewater atMoriyama Water Treatment Center was
stopped in the 15th stage because of the
improvement work (April to October,2014).

AverageNote）Area from Minatoshin Bridge to Oseko Bridge
is omitted because of not enough data

Utilization of reclaimed wastewater at Moriyama Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservior for pollution control

With TRWKR

AreaIntroduction of advanced water treatment at the Meijo Water Treatment Center(cm)

Sakae Bridge to Sanage Bridge（not enough data）
60

80

80

Sanage Bridge to Johoku Bridge

80

80
80

60

60

Johoku Bridge to Asahi Bridge

No TRWKR→Declining

With TRWKR
60

New water quality improvement measures→improving a little or keeping trend
60

60

80

Asahi Bridge to Matsushige Bridge

60

60

80
80

60

80

80
80

60

60

60

Matsushige Bridge to Oseko Bridge

第1st.

80

第2st. 第3st. 第4st. 第5st. 第6st. 第7st.
cm

第8st. 第9st. 第10st. 第11st. 第12st. 第13st. 第14st. 第15st.

cm

２５Change in Transparency

The 1st,3rd, 5th stage： with TRWKRNo rain on the day and the previous day
The 7th, 9th, 11th, 13th, 15th stage： No TRWKRNo rain on the day and the previous day

Average (from spring to early summer)
Sanage城北橋～猿投橋
Bridge to Johoku Bridge
80
60

71

Improved
68

58

58

64

66

63

65

40
20
0
H19.4.22～
6.30

H20.4.1～
6.30

H21.4.1～
6.30

H22.4.1～
6.30

H23.4.1～
6.30

H24.4.1～
6.30

H25.4.1～
6.30

H26.4.1～
6.30

60

32

26

19

20

26

16

16

Improved
53

52
43

51

54

50

56

40
20
0
H19.4.22～
6.30

H20.4.1～
6.30

H21.4.1～
6.30

H22.4.1～
6.30

H23.4.1～
6.30

H24.4.1～
6.30

H25.4.1～
6.30

H26.4.1～
6.30

第1st.
第3st.
第5st.
第7st.
第9st.
第11st.
第13st.
第15st.
第7ｓｔ.
第1ｓｔ.
第3ｓｔ.
第5ｓｔ.
第9ｓｔ.
第11ｓｔ.
第13ｓｔ.
第15ｓｔ.

Numberof data

9

9

11

6

9

14

60

57

60

0
H19.4.22～
6.30

H20.4.1～
6.30

H21.4.1～
6.30

H22.4.1～
6.30

H23.4.1～
6.30

H24.4.1～
6.30

H25.4.1～
6.30

H26.4.1～
6.30

第1st.
第3st.
第5st.
第7st.
第9st.
第11st.
第13st.
第15st.
第7st.
第1ｓｔ.
第3st.
第5st.
第9st.
第11sｔ.
第13ｓｔ.
第15ｓｔ.

Numberof data75

透視度(cm)Ｔｒａｎｓｐａｒｅｎｃｙ（ｃｍ）

透視度(cm)Ｔｒａｎｓｐａｒｅｎｃｙ（ｃｍ）

Improved
59

52

22

56

29

22

20

41

33

27

100

80
60

65

Matsushige
Bridge to Oseko Bridge
大瀬子橋～松重橋

Note） Not enough data
61

60

20

JohokuBridge to Asahi Bridge
朝日橋～城北橋
100

61

40

第1st.
第3st.
第5st.
第7st.
第9st.
第11st.
第13st.
第15st.
第7ｓｔ.
第1ｓｔ.
第3ｓｔ.
第5ｓｔ.
第9ｓｔ.
第11ｓｔ.
第13ｓｔ.
第15ｓｔ.

Number 13
of dataAsahi Bridge
to Matsushige Bridge
松重橋～朝日橋80

透視度(cm)Ｔｒａｎｓｐａｒｅｎｃｙ（ｃｍ）

透視度(cm)Ｔｒａｎｓｐａｒｅｎｃｙ（ｃｍ）

100

Improved form Sanage Bridge
to Matsushige
Bridge
100

80
60

59

56

54

56

57

H20.4.1～
6.30

H21.4.1～
6.30

H22.4.1～
6.30

H23.4.1～
6.30

58

56

H25.4.1～
6.30

H26.4.1～
6.30

48

40
20
0
H19.4.22～
6.30

H24.4.1～
6.30

第1st.
第3st.
第5st.
第7st.
第9st.
第11st.
第13st.
第15st.
第7ｓｔ.
第1ｓｔ.
第3ｓｔ.
第5ｓｔ.
第9ｓｔ.
第15ｓｔ.
第11ｓｔ.
第13ｓｔ.

Number 11
of data32

29

Transparency from Sanage bridge to Matsushige bridge in the 15th stage got better than that in the 7thstage. Transparency from spring to early summer is less than 70cm which is civil acceptable value.

30

24

26

34

31

２６

1st – 6th stage : With TRWKRNo rain on the day and the previous day
7th – 15th stage : No TRWKRNo rain on the day and the previous day

３． ＣＯＤ
Change of COD

Utilization of reclaimed wastewater from Moriyama Water
Treatment Center was stopped during 15th stage
because of construction for improvement.

Upstream section （between Sakae Bridge and Sanage Bridge, average）
With TRWKR

Introduction of advanced water treatment at Meijo Water Treatment CenterIn service of Horikawa Ugan Rainwater Reservoir for pollution control
Utilization of reclaimed wastewater from Moriyama Water Treatment Center

Upstream section
After 8th stage
Over １０mg/L is more frequently

Numberof survey

5

18

13

6

9

6

5

8

5

9

9

7

8

7

7

■ How did COD change in the upstream section (between Sakae Bridge and Sanage Bridge)→ COD is over 10mg/L more frequently after 8th stage.

２７

1st – 6ti stage : With TRWKRNo rain on the day and the previous day
7th – 15th stage : No TRWKRNo rain on the day and the previous day

Change of COD
Middle and downstream section（between Sanage Bridge and Oseko Bridge, average)
With TRWKR

Introduction of advanced water treatment at Meijo Water Treatment CenterIn service of Horikawa Ugan Rainwater Reservoir for pollution control

improved or kept
kept Utilization of reclaimed wastewater from Moriyama Water Treatment Centerwith TRWKR
slightly worsened
without TRWKR

Numberof survey

115

202

171

85

112

94

89

71

80

121

120

92

100

89

91

■How did COD change in the middle and downstream section (between Sanage Bridge and Oseko
Bridge)?

→It seems that COD was improved and kept during TRWKR, and after the stop of TRWKR it was
remained at the same level until 11th stage. But after that it was slightly worsened.

２８

1st – 6th stage : With TRWKRNo rain on the day and the previous day
7th – 15th stage : No TRWKRNo rain on the day and the previous day

Change of COD（average in some sections）
between Minatoshin Bridge and Oseko Bridge is excepted.
.

Utilization of reclaimed wastewater from Moriyama Water Treatment CenterIn service of Horikawa Ugan Rainwater Reservoir for pollution control

With TRWKR(section)

Introduction of advanced water treatment at Meijo Water Treatment Center

mg/L

Sakae Bridge–
Sanage Bridge(not enough data)

14

Sanage Bridge –Johoku Bridge

10 12

8

8

10

10
10

10

12
12

Johoku Bridge –Asahi Bridge

10

12

12

14

10

10
12

10

after the stop of TRWKR
12
kept

with
14 TRWKR
12

Asahi Bridge –Matsushige Bridge

8

14slightly worsened
10

12

10

12

10
10

8

8

10

8

Matsushige Bridge –Oseko Bridge

1st

2nd

3rd

4th

5th

6th

7th

mg/L

8th

9th

10th

11th

12th

13th

14th

15th

mg/L

２９

1st,3rd,5th stage : With TRWKRNo rain on the day and the previous day
7th,9th,11th,13th,15th stage : No TRWKRNo rain on the day and the previous day

Change of COD spring – early summer

worsened

improved

Numberof survey

43

45

31

24

20

27

16

16

Numberof survey 38

60

29

22

24

42

35

33

worsened
not enough data

Numberof survey

15

16

12

6

9

worsened14

7

5

Number19
of survey

31

29

COD in the 15th stage was improved between Sanage Bridge and Johoku Bridge but worsened between Johoku
Bridge and Oseko Bridge in comparison with in the 7th stage just after the stop of TRWKR.

30

24

26

34

30

３０

1st – 6th stage : With TRWKRNo rain on the day and the previous day
7th – 15th stage : No TRWKRNo rain on the day and the previous day

4. Bubbles

Occurrence of bubbles from the bottom

Upstream section(between Sakae Bridge and Sanage Bridge, average)
With TRWKR

Introduction of advanced water treatment at Meijo Water Treatment CenterIn service of Horikawa Ugan Rainwater Reservoir for pollution control
Utilization of reclaimed wastewater from Moriyama Water Treatment Centerin the upstream section
After 6th stage
Bubbles weren’t seen

Numberof survey

24

38

15

2

8

3

5

8

5

9

9

8

7

7

7

not enough data

■ How did bubbles change in the upstream section (between Sakae Bridge and Sanage Bridge)?

→Bubbles weren’t seen after 6th stage.

３１

1st – 6th stage : With TRWKRNo rain on the day and the previous day
7th – 15th stage : No TRWKRNo rain on the day and the previous day

Occurrence of bubbles from the bottom
Middle and downstream section(between Sanage Bridge and Oseko Bridge, average)
With TRWKR

Introduction of advanced water treatment at Meijo Water Treatment CenterIn service of Horikawa Ugan Rainwater Reservoir for pollution control
Utilization of reclaimed wastewater from Moriyama Water Treatment CenterWith TRWKR
improved and kept

Numberof survey

105

206

167

47

97

without TRWKR
improved and kept

slightly
worsened

59

82

63

73

108

100

94

87

75

72

■ How did bubbles occur in the middle and downstream section (between Sanage Bridge and Oseko
Bridge)?
→It seemed that the bubbles was improved and kept during TRWKR and then it was slightly worsened in the 7th
and 9th stage. After that it was improved a bit again as a result of the water quality treatment.

３２

Occurrence of bubbles from the bottom
spring – early summer

1st,3rd,5th stage : With TRWKRNo rain on the day and the previous day
7th,9th,11th,13th,15th stage : No TRWKRNo rain on the day and the previous day

improved
improved

Numberof survey 33

42

27

25

20

22

16

16

Numberof survey

45

81

31

24

19

39

35

32

not enough data

improved

worsened

Numberof survey

12

14

12

5

10

14

7

5

Numberof survey

15

30

27

28

24

Bubbles were improved between Sanage Bridge and Johoku Bridge and also between Asahi Bridge and Oseko Bridge in the 15th stage

25

29

19

３３

川底からのあわ構成比(%)
ratio (%)
bubbles component
Occurrence of0
Minatosin
港新橋*
Kiraku
きらく橋*
Kizaemon
紀左ヱ門*
Oseko
大瀬子橋
Shiratori
白鳥橋*
Goryo
御陵橋
Atsutakinen
熱田記念橋
Hataya
旗屋橋
Kameya
瓶屋橋
Sumiyoshi
住吉橋
Oto
尾頭橋
Furuwatari
古渡橋*
Sannno
山王橋*
Matsushige
松重橋*
Hioki
日置橋*
Iwai
岩井橋*
Suzaki
洲崎橋*
Shinsuzaki
新洲崎橋*
Tennozaki
天王崎橋
Naya
納屋橋
Nishiki
錦橋
Tenma
伝馬橋
Sakura
桜橋*
Naka
中橋*
Gojo
五条橋*
Keiun
景雲橋*
Koshio小塩橋
Habashita
巾下橋
Asahi
朝日橋*
Daiko
大幸橋*
Takajo鷹匠橋*
Sujikai
筋違橋
Horihata
堀端橋*
Nakatsuchido
中土戸橋
Johoku
城北橋
Kinjo
金城橋*
Tabata
田幡橋*
Kitashimizu
北清水橋
kurokawa
黒川橋*
Shiga
志賀橋
Sanage猿投橋*
Chigonomiya
稚児宮人…
Kizune木津根橋
Ruriko
瑠璃光橋*
Tsujie辻栄橋*
KurokawaⅠ
黒川1号…
Meoto
夫婦橋
Asahi
旭橋*
Sakae
栄橋*

Change of bubbles from the bottom

At each bridge
In the 1st,3rd,5th,7th,9th,11th,13th and15th stage (spring – early summer)
No rainBoth with TRWKR and without TRWKR
Asahi Bridge

100

＊ ＊ ＊

＊

＊ ＊ ＊ ＊ ＊ ＊ ＊＊ ＊ ＊ ＊
＊ ＊ ＊

＊

＊ ＊

＊

40

Bubbles are frequently observed from spring to early summer between Naya Bridge andTenma Bridge, at Habashita Bridge and Kitashimizu Bridge.
＊

60

＊ ＊

70

＊ ＊

90

Nishiki Bridge

80

Habashita Bridge
Kitashimizu Waerfront Park

50

Naya Bridge

30

20

10

＊ ： under 10 samples

Occurrence of bubbles component ratio(%)= Days when bubbles rise from the bottom / All survey days × 100

３４

1st-6th stage ： With TRWKRNo rain on the day and the previous day
7th-13th stage ： No TRWKRNo rain on the day and the previous day

５． Ｓｍｅｌｌ

100

With TRWKR

Introduction of Advanced treatment at Meijo Wastewater Treatment Center
In-service of Horikawa Ugan Rain-water Reservoir for Pollution Control

80

Utilization of Reclaimed Wastewater
60

50

40

20

13
0

0

0

0

0

0

H24.9.22～12.16

H25.4.1～6.30

H25.9.29～12.17

H26.4.1～6.30

H22.4.1～6.30

0H24.4.1～6.30

0H23.9.11～12.16

0

H23.4.1～6.30

0H21.9.27～12.16

3

7

H21.4.1～6.30

9

H22.9.11～12.17

H20.9.28～12.16

H20.4.1～6.30

H19.9.8～12.16

0

H19.4.22～6.30

Occurrence of Smell the ration of Terrible Smell and Bad Smell , Smell(%)

Ｏｃｃｕｒｒｅｎｃｅ ｏｆ Ｓｍｅｌｌ
Ｕｐｓｔｒｅａｍ section

第1ｓｔ. 第2ｓｔ. 第3ｓｔ. 第4ｓｔ. 第5ｓｔ. 第6ｓｔ. 第7ｓｔ. 第8ｓｔ. 第9ｓｔ. 第10ｓｔ. 第11ｓｔ. 第12ｓｔ. 第13ｓｔ. 第14ｓｔ. 第15ｓｔ.
Data

23

40

15

2

8

3

5

8

5

9

9

8

8

7

7

■ Change of Smell→There was no reports of smell after 9th stage.

３５

1st-6th stage ： With TRWKRNo rain on the day and the previous day
7th-13th stage ： No TRWKRNo rain on the day and the previous day

Occurrence of Smell
Middle stream, Downstream section
With TRWKR

Introduction of Advanced treatment at Meijo Wastewater Treatment Center
In-service of Horikawa Ugan Rain-water Reservoir for Pollution Control
Utilization of Reclaimed Wastewater

Worsened

TRWKR
Improved

Data

106

210

170

50

109

62

84

without TRWKR
Improved/kept

67

75

113

108

98

93

82

87

■Change of smell→ After the stop of TRWKR, smell was worsened at 7th stage and then smell was improved as aresult of the water quality improvement.

３６

Kind of smell (Spring – Early summer)•With TRWKR•Introduction of Advanced treatment at Meijo Wastewater Treatment Center

1st-6th stage ： With TRWKRNo rain on the day and the previous day
7th-13th stage ： No TRWKRNo rain on the day and the previous day•In-service of Horikawa Ugan Rain-water Reservoir for Pollution Control

Utilization of Reclaimed WastewaterWith TRWKR

Ｎｏｔ ｅｎｏｕｇｈ ｄａｔａ
■Occurrence of smell
Smell of “ditch” and “sludge”

is about 80%.
No dataWith TRWKR

Smell of “Ditch” was decreased,
Smell of “Sludge” was increased

No data■Change of the kind of smell
At15th stage, smell of“ditch” and “sludge” isabout 40% each.

Smell of “ditch” and “sludge” is about 80%.

３７

1st-6th stage ： With TRWKRNo rain on the day and the previous day
7th-13th stage ： No TRWKRNo rain on the day and the previous day

Kind of smell (Spring – Early summer)

Improved

Improved

第1ｓｔ. 第3ｓｔ. 第5ｓｔ. 第7ｓｔ. 第9ｓｔ. 第11ｓｔ. 第13ｓｔ.第15ｓｔ.

第1ｓｔ. 第3ｓｔ. 第5ｓｔ. 第7ｓｔ. 第9ｓｔ. 第11ｓｔ. 第13ｓｔ. 第15ｓｔ.
Data

33

42

30

24

20

25

16

16

Data

46

81

37

25

22

43

35

34

*Not enough data

Improved

Improved

第1ｓｔ. 第3ｓｔ. 第5ｓｔ. 第7ｓｔ. 第9ｓｔ. 第11ｓｔ. 第13ｓｔ. 第15ｓｔ.

第1ｓｔ. 第3ｓｔ. 第5ｓｔ. 第7ｓｔ. 第9ｓｔ. 第11ｓｔ. 第13ｓｔ. 第15ｓｔ.
Data

12

14

13

5

9

14

7

5

Data

15

33

29

In the 15th stage, occurrence of smell had been improved from 7th stage(after TRWKR).

30

24

26

35

32

３８

Change of the smell along the river Spring-Early summer
Ratio of the kind of component “terrible smell - smell”（％）＝the number of day of “terrible smell - smel”／ all survey days ×100

1st 3rd 5th 7th 9th 11th 13th 15th stage no rain, both with TRWKR and without TRWKR
Nishiki Bridge

Kameya Bridge

Habashita Bridge

Naya Bridge

Asahi Bridge

In the middle stream, the places
reported smell, were almost the sameplaces reported bubbles from thebottom of river.

Kitashimizu
Shinsui Hiroba＊under 10 samples

Smelly places were “Atsutakinenn Bridge –Sumiyoshi Bridge” and “Naya Bridge – Temma
Bridge”, “Koshio Bridge – Habashita Bridge”,“Kitashimizu Bridge”.(Spring – early summer)

３９

Relation between bubbles and smell
Sanage Bridge – Minatoshin Bridge
Both with TRWKR and no TRWKR, include out of research period, No rain on the day and the previous day“Terrible smell - Smell”
４５％

When the bubbles occurred from the river, “ terrible smell- smell” isabout 45%, but without the bubbles it is 20%. Horikawa River smelled
more frequently when bubbles were seen.

“Terrible smell - Smell”
２０％

It was reported that bubbles
form the bottom were seen
frequently when water level
was down.

４０６． Color①Colorless⑪Dark gray

⑥Gray

②Milk white⑦Yellow gray

⑫Light yellow
green③Yellow⑧Light grayyellow green⑬Yellow brown④Yellow green⑨Gray yellow
green⑭Brown⑤Green⑩Gray green⑮Green brown

Photo
at Nishiki Bridge⑤Green⑦Yellow gray

⑨Gray yellow green⑩Gray green⑧Light gray yellow green⑪Dark gray

There weresome reports atthe time of “⑧light gray yellow
green”, “theriver wassmelled like“rotten Egg”,“fish wasgaspedpainfully” andso on.

４１

Component ratio of colors
Sanage Bridge – Minatoshin Bridge

1st-6th stage ： With TRWKRNo rain on the day and the previous day
7th-13th stage ： No TRWKRNo rain on the day and the previous day

Colors has added on the survey list since the 2nd stage“⑧light gray yellow green, ⑨gray yellow green, ⑩gray green” was seen high frequency.

■High frequency Colors⑧light gray yellow green, ⑨gray yellow green, ⑩gray green

４２

What colors were mainly seen

No rain on the day and the previous day

Component ratio of colors (Sanage Bridge - Minatoshin Bridge)
Compared with 11th and 13th, 15th stage

Ｄａｔａ113

Ｄａｔａ89

Ｄａｔａ93

Increased mainly ⑧ｌｉｇｈｔ gray yellow
green, ⑫light yellow gray and ⑭
brown■ What colors were mainly seen when impression of cleanness was “slightly dirty” or “dirty” ?
(Comparison among 11th stage, 13th stage and 15th stage）
th
In the 15 stage ⑧light gray yellow green ⑫light yellow and ⑭brown was increased.

４３

（Reference） Change of color of Horikawa Part1
A red tide occurred in the middle of April this year. After those days the light color was frequently
seen from the end of April to May.

Brown
A red tide occurred.

Nagashio means the tide on the day on which the difference between spring and neap is least.
Wakashio means the tide on the day after the day of Nagashio, transitional tide between spring and neap tide.

４４

（Reference）Change of color of Horikawa Part2

There are a lot of days with the light color.

４５

（Reference）Change of color of Horikawa Part3

There are a lot of days with the light color.

Material: website of Horikawa Sen-nin Chosatai 2010 executive committee
http://www.horikawa1000nin.jp/nishiki/nishiki_photo.htm

４６

Pictures were taken from about 12:00 to 13:30.
using a polarizing filter and adjusting the exposure to surface of the water.
Photo by Kawasemi Survey GroupChange of color （spring ～ early summer）

7th , 9th, 11th,13th,15th stage: No TRWKRNo rain on the day and the previous day

Not enough data

（graph legend）”cloudy”②milk white⑧light gray yellow green⑫light yellow gray”red tide”⑬yellow brown⑭brown⑮green brown”sludge”⑥gray⑩gray green⑪dark gray

■ Change of component of colors→The ratio of “red tide” and “sludge”
increased in the 13th stage in comparison
with in the 11th stage, and “cloudy”
decreased.
In the 15th stage, “red tide” and “cloudy”
were high, and “sludge” was low.
We guess that plankton easily multiplied atsurface of water because of less amount of
rainfall, higher temperature and longer
sunshine time than usual, therefore thebottom layer became bin oxygen and it
caused blue tide state (“cloudy”).

４７Component ratio of colors which is mainly seen

7th , 9th, 11th,13th,15th stage: No TRWKRNo rain on the day and the previous day

The ratio of “cloudy” was high between Asahi Bridge and Matsushige Bridge.
Not enough data

■ Change in component ratio of colorsth
In the 15 stage, the ratio of “cloudy” was high between Asahi
Bridge and Matsushige Bridge, “cloudy” and “red tide” werehigh between Matsushige Bridge and Oseko Bridge.

The ratio of “cloudy” and “red tide” were highbetween Matsushige Bridge and Oseko Bridge.

４８

REPORT1 Red tide occurred and water color became green brown or brown.
From 12th to 16th Apr. 2014
Survey groups which observed in fixed points, ShiratoriTayu Goryobashi Chosatai, Kojo Horikawa-to-Seikatsu-wo-Kangaerukai Chosatai and Kawasemi
Chosatai, reported that water color had been green brown or brown on the points from downstream to midstream in Horikawa.
Judging from reports of survey groups from 12th to 15th Apr. and the secretariat’s seeing in the spot on 16th Apr. , it seems that red tide occurred fromoutside Horikawaguchi Tide Gate, the sea to Gojo Bridge.

15th Apr. a partial lunar eclipse
maximum tide level
T.P.1ｍshift of tide level2m and over

Neap tide

Middle tide

Spring tidefrom 12th to 16th Apr. 2014
4/16

Data by Nagoya Port tide level by Japan Meteorological Agency

・Shift of tidal level is 2m and over.
・Maximum tide level climbed T.P.1ｍ.

⇒Seawater was pushed up strongly in this period

４９■ The secretariat’s eye
Date, time and spot・Date from 9am to 1pm on 16th Apr.
the ebb tide on spring tide day
・Spot outside Horikawaguchi Tidal Gate, the sea
from Hataya Bridge to Gojo Bridge
Result1. The water color was brown from outside Horikawaguchi
Tidal Gate (the sea) to midstream of Horikawa.
2. Much whirling phytoplankton was seen.

Gojo Bridgea kind of phytoplankton

Furuwatari Bridge

3. Climbing dotted gizzard shads were seen.
A school of dotted gizzard shads was seen underFuruwatari Bridge. About 50 of cormorants capturing themwere also seen. Dotted gizzard shads eat plankton, small
shellfishes and diatoms. Possibly they climbed for feeding
but relationship to red tide isn’t clear.
Under Furuwatari Bridge
11:05

Red tide

Hataya Bridge

堀川口
防潮水門

Horikawaguchi Tidal Gate

５０

States of red tide

1. Nishiki Brigde

2. Naya Bridge

3. Tennozaki Bridge

16th Apr. 2014

4. Suzaki Bridge

5. Iwai Bridge

6. Matsushige Lock Gate

Photo by secretariat

7. Oto Bridge

8. Kameya Bridge

9. Horikawaguchi Tidal Gate
outside５１

Moving of plankton
In the water
light after stirring

105minutes later

Water settled after stirred. Plankton moved to surface. 5minutes
later it gathered to direction of strong ray.
5minutes laterstrong ray

it gathered to direction
strong rayof strong ray.

strong ray

165minutes later strong ray

Part of planktomsank to the bottom
It floatedagain.

30minutes later

50minutes laterstrong raystrong ray

1hour after settled in a dark room

We settled thebottle in a darkroom and it spreadin whole, but someof it gathered on
the surface.
Photo by secretariat
using a polarizing filter

５２

REPORT2 Water of Horikawa looked too black

Kojo Horikawa-to-Seikatsu-wo-Kangaerukai
Report and Photo on 13th May 2014

REPORT As we cleaned around Naya Bridge today, some of members said thatwater of Horikawa looked too black. So I will report with a photo, about 11:50
13th May 2014. Because of rain at last night, sludge might have been stirred?
It smelt like rotten egg peculiar to Horikawa.
Naya Bridge 11:50 13th May 2014

Naya Bridge 11:50 13th May 2014
Data by Japan Meteorological Agency Nagoya
Rainfall 36.6ｍｍ from 6pm 12th to 6am 13th May 2014

the time that tide changed the ebb into the flood after rain

Naya Bridge 11:50 13th May 2014５３

■ The secretariat’s eye
Date, time and spot・Date from 11am to 5pm 14th May 2014, from the ebb to the flood on spring tide・Spot from Nishiki Bridge to Hataya Bridge, outside Horikawaguchi Tidal Gate, Nagoya
Port
Result
1. From Nishiki Bridge to Hataya Bridge ・・・ gray green, light gray yellow green
2. From Nishiki Bridge to Tennozaki Bridge ・・・ rising sludge, outcrop of waterside sludge
3. Outside Horikawaguchi Tidal Gate (the sea side) and Nagoya Port ・・・ gray green brown
affected by red tid

Water color around Naya Bridgefrom 12th to 14th May gray green→light gray yellow green
The day before the rainy day
Nishiki Bridge 12:15 12th May

The rainy day (survey group reported)
Nishiki Bridge 12:15 13th May

The day after the rainy day(secretariat observed)
Nishiki Bridge 11:30 14th May

a little lighter color
than that of the previous day
Photo by Kawasemi Survey Group at Nishiki Bridge photo calender

５４

sludge

blue
tide

red
tide

3 colors are mixed
in different transmittance

We guess that water color looked too black on 13th May
because it was strongly affected by rising sludge, althoughrelationship to rain isn’t clear, .

Rainfall 36.6ｍｍ from 6pm 12th to 6am 13th May 2014

5/12

gray green light grayyellow green

5/13

5/14

Data by Japan Meteorological Agency Nagoya

gray float sludge and black sludge
Color mixed ・Rising sludge,
・Blue milky color including sulfide
3 colors
・Red tide in Nagoya Port, color of phytoplankton
information photosludgeinformation photo

blue tide
including sulfide

information photo

red tide５５

(Reference)Why does Horikawa become lack of oxygen and milky
Influx of organic substance-> Anoxia of bottom mud, water->Sulfide(H2S,HS- etc)

Oxygen(O2)The example of

Water

Sulfide(H2S,HS- etc)
combined with Oxygen(O2),
Be generated particulate sulfur (milky)
become particulate sulfur.
Smell of hydrogen sulfide（Ｈ2Ｓ） Sometimes water become
process to be milky
milky.

Influx of organic substanceMilky
S(colloidal particulate sulfur )Ｈ2 O
Resolution of organic
substance

Oxygen(O2)Sulfide(H2S,HS-etc)

O2

Resolution of organic
substance

Seawater

O2

O2

SO42-

O2
consumption of oxygen

O2

O2

sulfate reducing bacteria

Sulfuric
acid ionO2 Condition of without oxygen
Mud of the bottom

Iron sulfide(black – dark gray)56

Rain fall

(Reference) Change of the color after rainfall
2011.613

14

15

S(colloid : milky)
Influx of organic substanceRaise sludge H O
O22
H2S,HS-

Sea water
中潮

Middle tide

23.0

中潮tideMiddleHypoxia大潮
Springtide

Sulfate-reducing
bacteria

SO42-

2012.22122

大潮tideSpring23

Spring tide
大潮

7.0

24

大潮
Spring tide

27.5

25

中潮

Middle tide

中潮

Middle tide

4.0

2012.86

7

中潮
Middle tide

42.5mm8

9Middle中潮tide中潮
Middle
tide

10

小潮
Neap
tide

小潮
Neap
tide

2013.626

27

28
Information : Horikawa Sen-nin Chosatai(HSC)
http://www.horikawa1000nin.jp/nishiki/nishiki_photo.htm

Middle 中潮
tide

35.0mm中潮 tideMiddleMiddle中潮 tide57

(Reference)Why does bottom mud become black?

Hydrogen sulfide react with Iron sulfide(black – darkgray) to form iron content.
Iron in the water without oxygeniron hydroxide(Fe(OH)2,2Fe(OH)3）

Water(anoxia)
floating mud

Became black by iron sulfide
sulfate reducing
bacteria->sulfide(H2S,HS-etc)

Bottom mud(without oxygen)■ Bottom mud（without oxygen）
Hydrogen sulfide react with Iron sulfide（FeS,FeS2：Black） to form iron content.
H2S + 2Fe(OH)3 → 2Fe(OH)2 + S + 2H2O
H2S + Fe(OH)2 → FeS + 2H2O
FeS + S→ FeS2
Under the condition without oxygen, Hydrogen sulfide reacts
with Iron sulfide (FeS,FeS2) to form iron content. This Iron
sulfide is black. So bottom mud become black.
On the other hand, Hydrogen sulfide(H2S, HS- etc) and Iron
are combined. Hydrogen sulfide decreases. Causal substanceof smell of hydrogen sulfide and milky also decreases.

58

(Report3) Bucket of water is yellow and gray and includes some brown
particles.
Chikyu Club Chosatai report / photo 2014.5.28（spring tide）

Goryou Bridge

Kameya Bridge

Nishiki Bridge

Photo : secretariat

report / photo : Chikyu Club Chosatai

Some beings
Photo : secretariat
Grapsoid crab

Kinds of goby

Tenno Bridge – Naya Bridge
Photo : secretariat

Young ellYoung perch

Kinds of shrimp

Because of the 60mm rainfall from May 26th to May 27th, water became anoxic. Hydrogen sulfide andalso particulate sulfur generated. Water became yellow and gray. And these days are in spring tide, so redtide went upstream easily from Nagoya port. We thought brown particle was related to red tide.

59

Frequency of finding Litters（From ２nd～15th stage，all section）

７．Litters

From 2nd to 6th stage :With TRWKR No rain on the day and the previous day
From 7th to 15th stage :Without TRWKR No rain on the day and the previous day■Litters component：Plastic wastes(PE、plastic bag、noodle cup、foam tray,
pet bottle ,etc.),can,glass,cigarette (wrapping,butt)“PE shopping bag 1.8”means that PE
shopping bag was found 1.8 times in 10
investigations.
(or 18 times in100 investigations)

Frequency of litters wasin decreasing trend .

P

neFrequency of finding litters (/10 surveys)=number of surveys in which litters was found /number of surveys ×10＊Frequency of finding litters is not same as the number of litters.
If Litter is found one or more times in each survey ,it counts just one.

■What kind of litters was found more frequency?
Cigarette butt was the most frequent.
The other litters was on decreasing trend .

６０

Litters on Riverside Ways
（From ２nd～15th stage，each section）■Litters component：Plastic
From 2nd to 6th stage :With TRWKR No rain on the day and the previous day wastes(PE, plastic bag,noodle cup, foam tray,
From ７th to 15th stage :Without TRWKR No rain on the day and the previous daytray,pet bottle, etc.), can,glass,
cigarette(wrapping, butt)

With TRWKR

Plastics : in decreasing trend

Component ratio(%)＝the number of sighting each kind of litter／the number of sighting all kind of litter ×１００
Litter does not include leaves, branches and grass.
＊The number of sighting is not the number of litters.
We count one, even if at least one litter is sighted in the survey.

■What kind of litters was found on the riverside ways
more frequently? The rate of cigarette was high.

６１Change in Floating Litters

From 2nd to 6th stage : With TRWKRNo rain on the day and the previous day

From ７ｔｈ to 15th stage : Without TRWKRNo rain on the day and the previous day■Litters component：Plastic wastes(PE、plastic bag、noodle cup、foam tray,
pet bottle ,etc.),can,glass,cigarette (wrapping,butt)

4.7litters/one survey

Rate of plastics is highThe sum of eachstage, thenumber of litters per
one survey

Note: the number of litters per one survey = the number of each litters found in all surveys/thenumber of surveys＊the number of litters is the number of litters found through all surveys“If some kind of litters was found “countless (=***)”in some survey, it counts “10”, the maximum
number in one survey substituted for the number of “countless”■What trend the floating litters goes?
→There most frequent floating litters were found in 15th stage.

６２

From 1st to 6th stage :With TRWKR No rain on the day and the previous day
From 7th to 15th stage :Without TRWKR No rain on the day and the previous day

87( )Number of data

Sakae Bridge～Sanage Bridge

1st stage (32)
3rd stage (15)
5th stage (8)7th stage (5)9th stage (5)11th stage (9)13th stage (8)15th stage (7)

6
5
4

3

2nd stage (42)4th stage (2)6th stage (3)8th stage (8)10th stage (9)12th stage (8)14th stage (7)

2

0.9
0.5
1
0.3 0.3

0.3 0.3
0.1 0.1 0.2

0.5 0.5 0.3
0.1
0.1 0.1

0.2

0.1

0.3

0

plastic

canbottlepaper

cigarette

Number of litters per one survey

Number of litters per one survey

Change of the number of Floating Litters( )Number of data

8
7

1st stage (46) 2nd stage(107)
3rd stage (82) 4th stage (28)
5th stage (37) 6th stage (16)
7th stage (25) 8th stage (25)9th stage (22) 10th stage(43)11th stage(43) 12th stage(40)13th stage(35) 14th stage(25)15th stage(34)Asahi Bridge～Matsushige Bridge

6
5
4
2.3
1.8

3 2.6

2
1
0

1.7
0.2
1.0
1.1 1.6
1.3 1.2 0.8
0.9 0.4 0.2 0.10.3
1.0
0.2
0.1
0.4
0.1 0.10.10.2 0.1 0.1
0.5
plastic

can

0.8
0.8
0.7
0.3
0.4
0.3
0.5 0.6
0.3 0.30.10.30.2
0.0 0.1 0.4
0.1 0.1

0.5
0.1 0.1
bottlepaper

cigarette

…

…

8

7.1

7

Sanage Bridge～Johoku Bridge

6

4.8
4.6

5
3.5

4
3

2.6

3.6

3.8

3.1 2.5
2.5

2 1.7 1.4
1.3
1( )Number of data
1st stage (37) 2nd stage (47)
3rd stage (42) 4th stage (11)
5th stage (30) 6th stage (17)7th stage (24) 8th stage (16)9th stage (20) 10th stage(23)11th stage(27) 12th stage(20)13th stage(16) 14th stage(17)15th stage(16)2.2 1.8

0.6

0.6
0.8
0.4
0.5
0.7
0.4
0.30.30.2 0.2 0.1 0.4 0.4

0.2

0.4

0

plastic

can

0.5
1.1
0.4 0.4 0.4
0.3 0.30.4
0.3
0.2
0.2 0.1
0.2
0.1
0.1
0.1
0.2

bottlepaper

0.3
0.2 0.1
0.1

cigarette

Number of litters per one survey

Number of litters per one survey

There were many floating litters In “Sanage Bridge ～Johoku Bridge” section and “Matsushige Bridge ～Oseko Bridge” section.
87( )Number of data
7.0
6.2

6

Matsushige Bridge～Oseko Bridge

5
4
3
2
1

0

4.0
3.0 3.4 3.4
2.9
2.5
2.0
2.6
1.5
1.3
1.1
0.3
0.9 1.4
0.2
0.2 0.2
0.1 0.1
0.1

plastic

Johoku Bridge～Asahi Bridge

6
5
4

3.0

3
2

1st stage (12)
3rd stage (14)
5th stage (13)7th stage (6)9th stage (9)11th stage(14)13th stage (7)15th stage (5)2nd stage (21)
4th stage (2)6th stage (4)8th stage (5)10th stage(12)12th stage(12)14th stage(11)

2.0
1.5

1.1
0.5
0.4
0.1
1
0.3
0.1 0.1 0.2 0.3 0.2

0.2 0.4
0.2 0.3 0.1 0.2

0.1

0plastic

canbottleKind of litters

paper

0.2
0.1

0.4

cigarette

Number of litters per one survey

Number of litters per one survey( )Number of data

7

bottlepaper

cigarette…

Kind of litters
8

0.1 0.1can

1st stage (32) 2nd stage (42)
3rd stage (15) 4th stage (2)5th stage (8) 6th stage (3)7th stage (5) 8th stage (8)9th stage (5) 10th stage (9)11th stage(9) 12th stage (8)13th stage(8) 14th stage (7)15th stage(7)
2.6
1.6
2.2
1.3
1.4 1.0
1.0 1.1
0.7 0.8
0.9
0.70.60.5
0.7 0.8
0.6
0.2
0.1 0.3
0.1
0.1
0.10.1 0.1 0.1 0.1

8( )Number of data

Oseko Bridge～Minatoshin Bridge

7
6

1st stage (3)3rd stage (5)5th stage (2)7th stage (0)9th stage (0)11th stage (0)13th stage (0)15th stage (0)

5.0

5
3.7

4
3
2
1

2.0
2.0

2.0

2nd stage (2)4th stage (2)6th stage (1)8th stage (0)10th stage (0)12th stage (2)14th stage (0)

1.7
0.5

0.4

0.2

1.0
0.5

0

plastic

canbottlepaper

cigarette…

■ In which section did a lot of litters float？
→ In “Sanage Bridge ～Johoku Bridge” section and “Matsushige Bridge ～Oseko Bridge” section.

６３

Change in Floating Litters along the Horikawa River
The 1st-15thｓｔage: include both with TRWKR and without TRWKR out of research period ,No rain on the day and the privious day

There were a lot of litters between
Matsushige Bridge and Oseko Bridge

There were a lot of littersaround Johoku Bridge

Around Matsushige Pumping
Station＊：Under 10 sumples
Note: the number of litters per one survey= the number of each litters found in all surveys/ the number of surveys＊the number of was found through all surveys“If some kind of garbage was found “countless(=***)”in some survey,it counts “10”, themaximum number in one survey substituted forthe number of “countless”

Kameya Bridge～Sumiyoshi Bridge
Photo: secretariat

６４

Kind of floating Litters(component ratio)

With TRWKR■ Litters component：Plastic wastes(PE、plastic bag、noodle cup、foam tray,
pet bottle ,etc.),can,glass,cigarette (wrapping,butt)

From 1st to 6th stage :With TRWKR No rain on the day and the previous day
From 7th to 15th stage :Without TRWKR No rain on the day and the previous day

There were many prastic litters

Rate of litters(%)＝the number of each kind of litters ／the number of all kind litters×100
the number does not include leaves branches and grass＊the number of litters was found through all surveys“if some kind of litters were found ”countless (=***)”in some survey, it counts “10”, the maximum number in one
survey substituted for the number of “countless”■What kind of floating litters were found frequently?
→The rate of plastics is high, 60%(15th stage)

６５

８． WindDirection of windWind to upstream

Meoto bridg

Kitashimizu bridg

toupstream 14%
80
60
40
20
0

Wind from side

10%

Koshio bridg

todownstre 19%
am

toupstreamNo windfrom side57%

9%

1st to 15thstage,number ofsurvey 63

12%

Nishiki bridg

60

40
20

22%

to
downstream

No windfrom side

34%

10%

1st to 15th stage,
number of survey
77

32%

to
32%
upstream
100
80
60
40
20

No windfrom side51%

24%
1st to 15th stage,
number of survey
160
13%

Oto bridg

to32%
upstream

100
80
60
40
20
0

No wind

0

31%

to
11%
downstrea
m

80

0

100
80
60
40
20
0

1st to 15thstage,number ofsurvey 65

100

from side

Johoku bridg

toupstream 29%

100

from side

Wind blows frequently
along the Horikawa
River
.

to
downstreamto
upstream

9%

100
80
60
40
20

No windfrom side

14%

7%

30%

1st to 15th stage,
number of survey
231

44%
to
downstreamWind to downstream

No wind0

1st to 15th stage,
number of survey
134
todownstre 54%
am■Which direction?
We organized the data
through all surveys. The wind,blowing along the river, weremore frequent than that fromside. At the Nishiki bridge, therate of winds blowing along
the river was about 80%.

６６

９． Living things

Laying of turtles May 31th, 2014
Egg laying of carp May 4th, 2014
Reported by the Goyousuiato-gaien-aigokai
Reported by the Gyousuiato-gaien-aigokaiChild & Cormorant
April 2nd, 2014
Reported by the
Goyousui-gaien-aigokai

Crab, prawn, mosuquitofish, gambusia
Near the Tsujie bridge
May 25th, 2014
Reported by the Goyousui-gaien-aigokai

Fishing of mango fish, by the Matsushige lock gate
June 21st, 2014, reported by the surdin survey group

Brown soft-shell turtle, June 5th, 2014

Parent-child of brown eared bulbul,
at the Naya bridge, July 15th , 2014６７

１０．Result of survey of Shin-Horikawa River
Shin-horikawa river
Impression of the water pollution
Bad impression from Uzura bridge to Oi bridge
100％
89％
74％

18

5

19

27

19

3

■ Impression of the water pollution
In upstream of Shin-horikawa river, from Uzura bridge
to Oi bridge, ratio of “dirty” & “slightly dirty” wasmore than 70%. Especially, around Uzura bridge, allreports was evaluated “dirty” or “slightly dirty”.
Around Atsuta bridge in downstream, almost all results
were evaluated “slightly dirty” or “slightly clean”. The
impression of water pollution was worse in upstream
than in downstream.

６８

Shin-horikawa river, Transparency
Low transparency at Oi bridge■ Transparency

10090transparancy(ｃｍ)

67

70
60

79

79

80

58
48

50

The transparency in upstreamof Shi-horikawa river, from
Maizuru bridge to Kinen
bridge, was more than
70cm.It was acceptable
range of citizen. However it
was only 48cm at Oi bridge.

40
30
20
10

no data0

Atsuta bridge
17

Horagaibridge5

Oi bridge
19

Kinen bridge Uzura bridge
160Maizuru
bridge3＊acceptable range ofcitizen ＝transparency
70cm & overShin-HR, COD■ COD

18～19mg/L at Horagai bridge, Oi bridge and Kinen bridge
19

20
18

ＣＯＤ(mg/L)

16

18

19

15

14
12

10

10
8

The COD in upstream of shinhorikawa river, from Kinen
bridge to Horagai bridge washigh, 18 to 19mg/L.
At Atsuta bridge indownstream, that was low,
15mg/L.
The COD in upstream washigher than that in downstream.

6
4
2

no data0

Atsuta bridge
18

Horagaibridge5

Oi bridge
19

Kinen bridge Uzura bridge
250Maizuru
bridge2

６９

Shin-horikawa river, Babbles
High frequency of babbles from bottom on Uzura bridge■Occurrence of babbles?
Babbles were seen at Uzura bridge, Kinen
bridge and Oi bridge in Shi-horikawa river.
At Uzura bridge in upstream, the babbles
rising from the bottom of river were seen
90%. The frequency of babbles rising fromthe bottom of river were higher than thatflowed from downstream. At Maizuru
bridge, Horagai bridge and Atsuta bridge,
no babbles was seen.

Shin-horikawa river, Smell
High freqency of teribble to smell on Maiduru to Oi in upstream■Occurrence of smell?

31％

31％

33％

From Maizuru bridge to Oi bridge in
upstream, the rate of “terrible smell” to“smell” was 26 to 31%. At Atsuta bridgein downstream, all of the data was“slightly smell” or “no smell”.
The smell in upstream was worse thanthat in downstream.

26％

７０

Shin-horikawa river, Kind of smell■ Occurrence of the kind of thesmells
Upstream of river, “ditch”, ”sludge”,
and “rotten egg“ was smelled.

Shin-horikawa river, Colors■ Colors
Upstream of the river, green series
were seen frequently. But milk white
could be seen on Uzura bridge andKinen bridge. It can be consideredcaused by granular sulfide.
Also, green brown could be seen on
Kinen bridge, Oi bridge, and Atsuta
bridge. it is considered that wascaused by phytoplankton.

７１

11.Progress of Citizen’s Awareness
Activities of studies「全国 水都ネットワーク フォーラムin 松江」
平成２６年２月７日（金）公益財団法人なごや建設事業サービス財団

伊勢湾流域圏再生フォーラム
平成２６年３月１日（土）第３回堀川ラウンドテーブル開催
平成２６年７月２５日（金）開催：堀川まちづくりの会
報告：堀川まちづくりの会 ・事務局
堀川再生フォーラム
平成２６年３月２６日

堀川１０００人調査隊2010 第１４回調査隊会議
平成２６年２月１５日（土) 報告：事務局

７２

Progress of Citizen’s Awareness Activities of studies

名北小学校３年生 堀川散策
平成２６年４月９日（水）笹島小学校５年生 堀川水質調査
平成２６年５月１６日（金）堀川上流部で水遊び
平成２６年５月２５日（日）大杉小学校２年生 堀川観察会
平成２６年６月１０日（火）名北小学校３年生 堀川学習会
平成２６年６月１６日（月）笹島小学校５年生 堀川観察会
平成２６年６月２４日（月）飯田小学校３年生 堀川観察会
平成２６年６月３日（火）飯田小学校３年生８０名の児童よりお礼の寄せ書きが届く
平成２６年７月２５日（月）名北小学校３年生 堀川観察会
平成２６年６月６日（金）主催・協力・報告：黒川ドリーム会、御用水跡街園愛護会調査隊

高年大学環境学科 堀川探索
平成２６年６月１１日（水）報告：御用水跡街園愛護会調査隊

７３

•Horikawa Clean Experiment of Chinese water spinach 2014/6/22～•Ena agricultural High School and Nagoya Horikawa Lions Club experimented this year. Place：near the pier of Naya Bridge

実験開始
６月２２日（日）第１週間目
６月３０日（月）第５週間目
７月２８日（月）第１０週間目
９月１日（月）第６週間目
８月５日（火）第１１週間目
９月８日（月）第２週間目
７月７日（月）

第７週間目
８月１１日（月）第３週間目
７月１４日（月）第８週間目
８月１８日（月）第４週間目
７月２２日（火）第９週間目
８月２５日（月）

恵那農業高校の森本先生からの報告
平成26年8月20日
浮島の新たな浮かべ方を研究
竹に紐を巻きつけ、そこに切った茎を挟んだもの

７４

•Horikawa Clean Experiment of Chinese water spinach 2014/6/22～•Ena agricultural High School and Nagoya Horikawa Lions Club experimented this year. Place：near the pier of Naya Bridge

Great East Japan earthquake reconstruction
support with Chinese water spinach

Living things nearchinese water spinach
ハクセキレイ

ベンケイガニ

ボラの稚魚

ボラ

ギンヤンマ

ミシシッピアカミミガメ

ボラとカムルチー

ギンヤンマ産卵

中日新聞

平成２６年３月１３日（木）朝刊

High school students grew up mentally
through the experience at Tohoku disastersite.
資料：堀川1000人調査隊2010実行委員会HP
http://www.horikawa1000nin.jp/katudou/2014-06-20-kuusinsainikki.htm

７５

Activities of “Free Survey Groups” & “Cheering Groups”
清掃活動「堀川護岸・ぴかぴか大作戦」
錦橋と納屋橋間 ケルヒャー ジャパン㈱平成２６年４月１５日（火）～１８日（金）北区ウォーキング大会 主催：北区役所
平成２６年３月１５日（土）撮影：御用水跡街園愛護会調査隊

ホタルのエサになるカワニナを2000匹放流
ドリ-ム会会長梅本さん・高年大学の皆さん
平成２６年４月２日（水）中日新聞・朝刊
平成２６年４月１５日（火）

清掃活動
ぎふしんムーミン清水支部堀川応援隊
平成２６年６月１４日（土）

季節のお花の移植 生活支援センターの皆さん
平成２６年５月１９日（月）清掃活動・報告：御用水跡街園愛護会調査隊

春の堀川一斉大そうじ
主催：クリーン堀川
平成２６年４月１９日（土）報告：御用水跡街園愛護会調査隊
事務局

定点観測・清掃活動
中日本建設コンサルタント(株)かわせみ調査隊

７６

Activities of “Free Survey Groups” & “Cheering Groups”
堀川ギャラリーでパネル展示発表会「堀川を清流に１０年間を観る 写真とデータ」
名古屋市高年大学環境学科27期
平成２６年２月１２日（水）～３月２日（日）活動報告 「上流は下流を思い、下流は上流に感謝する」
水源の里を守ろう 木曽川流域みん・みんの会

堀川ギャラリー 個展 「堀川いいね」
ゴンドラと堀川水辺を守る会
事務局長 石浦薫さん
平成２６年７月１５日（火）～８月３日（日）報告：御用水跡街園愛護会調査隊

地下鉄久屋大通駅でパネル展示会
鯱城・堀川と生活を考える会が
平成２６年３月３日（土）～３月１４日（金）主催：伊勢湾流域圏再生ネットワーク

活動レポート：
伊勢湾流域圏再生ネットワーク事務局

活動レポート：
環境ボランティアサークル「亀の子隊」「堀川・歴史と文化の探索」を出版
堀川文化探索隊 伊藤氏、沢井氏

７７

Activities of “Free Survey Groups” & “Cheering Groups”
明電舎錦調査隊
http://www.horikawa1000nin.jp/katudou/2014-07-31-meidensha.htm

中日新聞 平成２６年２月２６日(水）朝刊

中日新聞 平成２６年４月８日

平成の新堀川浄化実験開始
平成２６年４月１０日（木)～参加：大同大学 大東憲二教授
写真：横井利明オフィシャルブログより

中日新聞

平成２６年６月６日（金）朝刊

７８

中日新聞
平成２６年６月３０日(月） 朝刊

Activities of “Free Survey Groups” & “Cheering Groups”
名古屋市に水道ができて、今年の９月１日で１００年
堀川の浄化とも関連が深い名古屋市の上下水道事業について 中日新聞に連載記事が掲載

８月２０日（水）朝刊

８月２１日（木） 朝刊

中日新聞 平成２６年８月１９日（火） 朝刊

８月２３日（土）稚児宮人道橋の地下水汲み上げポンプが始動
平成２６年８月２９日（木） 報告：御用水跡街園愛護会調査隊

８月２２日（金） 朝刊

朝刊

７９

Events
堀川の歴史をたどる映画の無料上映会「堀川物語 ～川と人と町～」」平成２６年３月２１日（月・祝）
主催者：名古屋活動写真

堀川友禅流し平成２６年４月５日（土）主催：北区役所 北区まちづくり推進協議会
報告：御用水跡街園愛護会調査隊 事務局

中日新聞
平成２６年４月６日（日）朝刊より

中日新聞 平成２６年４月１８日(金）朝刊より

なごや生物多様性センターまつり
平成２６年５月１０（土）主催：名古屋市環境局
生物多様性センター

８０

Events
堀川フラワーフェスティバル２０１４開幕
平成２６年５月９日（金）～１１日（日）報告：御用水跡街園愛護会調査隊

読売新聞

堀川フラワーフェスティバル参加レポート
平成２６年５月１１日（日）報告：愛知淑徳大学

平成２６年５月１０日（土）朝刊
読売新聞 平成２６年６月１日(日）朝刊より

８１

Events

中日新聞 平成２６年６月２日（月）朝刊より

第１０回「堀川エコロボットコンテスト２０１４」
平成２６年８月１７日（日）主催：名古屋堀川ライオンズクラブ・名古屋工業大学
報告：事務局

なごや水フェスタ 平成２６年６月１日（日）参加：名古屋市高年大学環境学科２８期調査隊
名古屋グランパス調査隊
名古屋堀川ライオンズクラブ調査隊

春の環境デーなごや２０１４ 堀川体験乗船「身近な自然体験会～船から発見！
私たちの堀川」平成２６年６月７日（土）主催：名古屋市環境局
協力：名古屋堀川ライオンズクラブ
報告：事務局
読売新聞

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