Horikawa Sennin-Chosatai 2010
(Horikawa River Thousand-Citizen Survey Network 2010)

Summary of the 6th Stage (September 27th 2009～December 16th)

堀川1000人調査隊2010事務局 平成22年2月27日

1

Number of Participantsof Horikawa Sen-nin Chosatai 2010
Horikawa Sen-nin Chosatai started accepting participation on 26th March,2007

22nd Apr.
2007.

15th Feb.
2010

Fixed Point
Observation Groups

55Groups
497Citizens

77Groups
768Citizens

Free Survey Groups

22Groups
234Citizens

34Groups
602Citizens

Horikawa CheeringGroups88Groups
1,531Citizens

1,651Groups
12,753Citizens

Total

165Groups
2,262Citizens

1,762Groups
14,123Citizens

4Number of Survey Reports
Number
1st Stage

22nd.Apr2007～30th.Jun.
(1st. July.2007～7th.Sep.2007)

2nd Stage

8th.Sep.2007～16th.Dec.2007(17th. Dec.2007～16th. Dec.2007)

3rd Stage

1st.Apr.2008～30th.Jun.2008(1st. July. 2008～27th.Sep.2008)

4th Stage

28th. Sep.2008～16th. Dec.2008(17th. Dec.2008～31th. Mar.2009)

5th. Stage

1st. Apr. 2009～30th. Jun. 2009

(1st. July.2009～26th. Sep. 2009)

6th. Stage

27th. Sep. 2009～16th. Dec. 2009

Total

258
134
383
103
245
64
152
100
145
54
120
1,758

6

Transmission Term of Raw Water from the Kiso River
Days of Term

Days ofTransmission

1st Stage (22nd. Apr2007～30th. Jun.)70

52 (74%)(1st. July.2007～7th.Sep.2007)

69

41

2nd Stage (8th.Sep.2007～16th.Dec.2007)100

84 (84%)(17th. Dec.2007～16th. Dec.2007)

106

86

3rd Stage (1st.Apr.2008～30th.Jun.2008)91

81 (89%)(1st. July. 2008～27th.Sep.2008)

89

39

4th Stage (28th. Sep.2008～16th. Dec.2008)80

50 (63%)(17th. Dec.2008～31th. Mar.2009)

105

93

5th Stage (1st. Apr. 2009～30th. Jun. 2009)91

82 (90%)(1st. July.2009～26th. Sep. 2009)

88

63

6th Stage (27th. Sep. 2009～16th. Dec. 2009)81

60 (74%)

Total

970

686 (71%)7

Summary of the Citizens’ Survey
from 1st to 6th stage
・Clearness?

・Transparency?

・Bubbles?

・Smell?

■ The changes thought to be an effect of the TRWKR was observed
from the Sanage bridge to the Matushige bridge. （ref. following table）■ It was confirmed that the quality of the water was worse “fromspring to early summer” than “from autumn to early winter.”
The reasons are thought to be;① Because the temperature of the HR comes to be higher “from spring to earlysummer” than “from autumn to early winter”, contamination (organism etc.) tends tomelt to water and increase easily.
② “From spring to early summer”, the water level at the daytime ebb tides is lower
than “from autumn to early winter”. Therefore, the investigation “from spring toearly summer” easily receives the influence of the tide (sludge circulation etc.)16

Improved area
improved area
Topic

Method of evaluation○：Improved area
Minatoshinbashi～Ohseko bridge

Ohseko～Matsushige
bridgeImprovements
stage by stage(comparison of 1st and 5th stage)

Impressio
n ofclearness Transferrence is present or nottransparency

Improvements
stage by stage(comparison of 1st and 5th stage)

Matsushige～AsahibridgeAsahi～JohokubreigeJohoku～Sanagebridge

○

○

○

○

○

○

○
○

○

Improvements
stage by stage(comparison of 1st and 5th stage)

○

○

○

Transferrence is present or not

○

○

○

bubbles

Improvements
stage by stage(comparison of 1st and 5th stage)

○

smell

Improvements
stage by stage(comparison of 1st and 5th stage)

ＣＯＤ

Transferrence is present or not

○

○

○
○

○

Summary of the Citizens’ Survey
from 1st to 6th stage
1. Water color The actual condition of the color and impression was began
to understand.
•

The color frequently observed was “light gray yellow green", "grayyellow green”, ”gray green.”• 80% of people feel dark gray unpleasant or a little unpleasant.
• The “dark gray” is observed when the sludge exposed on the surface of
the water.

The color of the water is influenced from sunshiny and depth,
it has been understood from the reports that accumulation offurther date and the research are necessary to understand theinfluences on water color.

17,18

Summary of the Citizens’ Survey
from 1st to 6th stage
2. Garbage
 The number of the floating matter (artificial garbage) andgarbage on the road are decreasing tendency.
3. Living things It was confirmed at the Koshio bridge that a lot of young
fished of the mullet has passed ran up.
 A lot of sesarmops intermedium was seen near the Nayabashi bridge.
 Waterweeds were growing in the river to the Sujikai bridge.

17,18

3 years since the beginning of the TRWKRThe Horikawa River water environment was synergistically
improved by recovery of self clarification capabilities of theriver and so on.
z

About 3 years have passed since beginning of the social experiment of the
Horikawa River (Transmission of raw water from the Kiso river)z It was confirmed that the improvement of water environment was resulted fromthe effect of clarification, because of the reports about impression of theclearness, transparency, COD, bubbles and smell.
z Also, some changes in the growth environment and the actions of living things
were observed; e.g.,

3 years since the beginning of the TRWKRzThe growing area of water weeds is spread to Sujikai bridge, and run of a large
number of striped mullets. It is considered that; the improvement of water
environment in this three years is resulted from not only direct effect of
TRWKR, but also, besides, synergistically effect of implementation ofclarification policies, revival of HR’s self clarification capabilities, progress ofawareness for clarification on all watershed area, and the change in asocial
environment including the charge on plastic bag.

Impression of water clearness

1st Stage - 6th Stage

The ratio of “clear” and “neither”(With TRWKR, No Rain)*）％value：①clear ＋②a little clear ＋③neither
100

Impression of clearness(%)

100

25 investigation of 31 were executed onJune 27(at Kizune bridge)

1st stage 2007.Apr.22～Jun.30

2nd stage 2007.Sep.8～Dec.16

3rd stage 2008.Apr.1～Jun.30

4th stage 2008.Sep.28～Dec.16

5th stage 2009.Apr.1～Jun.30

6th stage 2009.Sep.27～Dec.16

80

56
50

40

50 50

57

56

50

40

Number of theinvestigation

23

21

18

3

2

5

2

2

1

15

35

33

9

29

25

87

16
8

Matsushige B.～
Asahi B.
46

103

82

28

37

39

23

10%improved
Ohseko B.～
Matsushige B.

87

50
36

25

11

The number ofDate is small.
Minatoshinbashi B.
～Ohseko B.

93

53

38 36

34

12

57

50
43

39
27

0

The number ofdata is small.

45

20

100

73

The number ofdata is small.
60

The number ofDate is small.

16

37%improved

15%improved
Asahi B.～Johoku B.
12

21

14

2

13

4

Johoku B.～Sanage
B.
37

247

42

11

30

17

Sanage B.～Sakae B.
31

41

15

2

8

3

 The impression of water clearness was improved between the Sanage bridge
and the Matsushige bridge
 The impression of water clearness “from spring to early summer” is worse
than “from autumn to early winter.”21

Impression of water clearness

1st Stage - 6th Stage(With TRWKR, No Rain)

The water transference from Kiso river is present or not*）％value：①clear ＋②a little clear ＋③neither

Comparison between "with TRWKR" with "without TRWKR"
100
from the 1st stage to the 6th stage

Impression of Clearness(%)

90

with TRWKR
without TRWKR

80
70
60
46

50
40

33

 The impression of water clearness was improved between
the Sanage bridge and the Matsushige bridge
43
35

33

20
10

18

The number
of Dateis small.

31

1412%improved
11%improved0
Minatoshinbashi B.～
Ohseko B.

31

29

30

Ohseko B.～
Matsushige B.

17%improved

Matsushige B.～Asahi Asahi B.～Johoku B. Johoku B.～Sanage B.
B.

22

Transparency

1st Stage - 6th Stage(With TRWKR, No Rain)

50

Number of data
is small.

Minatoshinbashi
brig.
Minatoshinbashi －to Ohseko
Ohsekobrig. brig.

2nd stage

89
83

59

3rd stage 92 4th stage
84

56

61
54

60

53

7cm
improved

Ohsekobrig.
Ohseko－ toMatsushige
brig.
Matsushige brig.

5th stage

90

95

Matsusige
brig.
Matsushige－
to Asahi
Asahibrig.
brig.

74
61

59
52
45

Number ofdata is small.

AsahiAsahi
brig. －
toJohokubrig.
Johokubrig.

65→
Injection point of TRWKR

68

1st stage→
Meijo Treatment Plant

87

Confluence of→
the Shinhorikawa River

93→
Nagoya port

Transparency [cm]

100

100

100
90
80
70
60
50
40
30
20
10
0

6th stage
87
80

79
71

68

58

10cm
improved→
Confluence of the Shonai River

Number of data is small.

Johokubrig.－to
JohokuSanagebrig.
Sanagebrig.

Sup. Over 100cm values were regarded as 100cm and averaged.

 Transparency level between the Sanage bridge and the Matsushige bridge was
improved.
 Transparency level from Autumn to early Winter was better than that of from
Spring to early Summer.
34

Transparency
Comparison between “with TRWKR” and “without TRWKR”
Number of data is small.

73

73
64
54

Ohseko －Matsushige brig.

9cm
improved

45

14cm
improved

Matsushige －Asahi brig.

Asahi －
Johoku brig.

71

Without TRWKR

74
66

65

Injection point of
→
TRWKR

59

With TRWKR
Meijo→
Treatment Plant

Minatoshinbashi －Ohseko brig.

Transparency was improved.

Johoku －Sanage brig.

Confluence of→
the Shonai River

78

83

Confluence of→
the Shinhorikawa River

100
90
80
70
60
50
40
30
20
10
0

→
Nagoya port

The seeing trough level [cm](With TRWKR, No Rain)

Sanage －Sakae brig.

Sup. Over 100cm values were regarded as 100cm and averaged.

 Transparency level between the Johoku bridge and the Ohseko bridge was
improved.

35

COD

1st Stage - 6th Stage(With TRWKR, No Rain)

10
8
6
4
2

15
Number ofdata is small.

10 10

9

→
Nagoya port

COD [mg/L]

12
9
7

6
4 4

Number ofdata is small.

3rd stage

8

4th stage

14
11

11

12

11

9
7

6

3 mg/Ldecreased

5th stage

15

6th stage
14

13
11

12
10

3 mg/Ldecreased

9

Injection point→of TRWKR

14

2nd stage→
Meijo Treatment Plant

16

Confluence of→
the Shinhorikawa River

1st stage

18

9 9 9

10

4 mg/Ldecreased

9→
Confluence of the Shonai River

20

0Minatoshinbashi
brig.
Minatoshinbashi －Ohsekobrig.
to Ohseko brig.

Ohsekobrig.
Ohseko－ toMatsushige
Matsushigebrig.
brig.

Matsushige－
Matsusige
brig.
Asahi
brig.
to Asahi brig.

AsahiAsahi
brig. －
toJohokubrig.
Johoku brig.

JohokuJohokubrig.－toSanagebrig.
Sanage brig.

Sup. Over 20mg/L values were regarded as 20mg/L and averaged.

 COD between the Sanage bridge and the Matsushige bridge was improved.
 COD from Autumn to early Winter was better than that of from Spring to early
Summer.
43

COD
Improvement by TRWKRWith TRWKR

18

10
8
6
4
2
0

→
Nagoya port

COD [mg/L]

11

12

6

Confluence of the→
Shinhorikawa River

14

Minatoshinbashi
Minatoshinbashibrig.
－
to Ohseko
Ohsekobrig. brig.

15

14
12

9

8

2mg/L
decreased

12

3mg/L
decreased→
Meijo Treatment Plant

Number ofdata is small.

12
10

2mg/L
decreased

COD was improved.
Ohsekobrig.
Ohseko－ toMatsushige
brig.
Matsushige brig.

Matsusige
brig.－
toMatsushige
AsahiAsahi
brig. brig.

Asahi
brig.
Asahi
－to
JohokuJohokubrig.
brig.

Johokubrig.－
toJohokuSanagebrig.
Sanagebrig.

→
Injection point of TRWKR

16

Without TRWKR

11

10

→
Confluence of the Shonai River

20

Sanage －Sakae brig.

Sup. Over 20mg/L values were regarded as 20mg/L and averaged.

44

Bubbles1st Stage - 6th Stage(With TRWKR, No Rain)

40%
30%
20%

93

52
2
38

2
2
91

91
58

13
17
1

69

16
18

Inlet of TRWKR

60%

4.Bubbles from the bottom of river→
Injection point of TRWKR

70%

3.Bubbles from upstream site

2
6
1

→
Meijo Treatment Plant

80%

Confluence of→
the Shinhorikawa Riverfew data→
Nagoya port

General status of Bubbles component ratio(%)

7

90%

50%

2.Bubbles from downstream site

66→
Confluence of the Shonai River

1.No bubbles

100%

10%
0%
Minatoshinbashi Ohseko brig.
15

Ohseko Matsushige brig.
139

Matsushige Aasahi brig.

Asahi Johoku brig.

303

Asahi bridge – Matsushige bridge
Bubbles from the bottom are more than other area.
- Bubbles occur in sludge accumulated at the bottom

64

Johoku Sanage brig.
175

Sanage Sakae brig.
90

Bubbles from upstream site are more than otherarea. -> Bubbles occur by drops.

52Bubbles1st Stage - 6th Stage(With TRWKR, No Rain)
General status of Bubbles Compornent ratio(%)

Sakae Brige- Minatoshinbashi Bridge

1.No bubbles

2.Bubbles from downstream site

3.Bubbles from upstream site

4.Bubbles from the bottom of river

100%
90%
80%

33

16
2

12

17

22
2

7
2

9
1

50%

1

94

40%
30%

31

2

70%
60%

14
4

80

80

75

4th stage

5th stage

59

55

20%
10%
0%
1st stage

2nd stage

3rd stage

6th stage

Occurrence frequency decreased. → Improved53

Smell
7
7

6
6
8

90%

50%

30%
20%
10%

86

7
10

5.smell too bad(With TRWKR, No1 Rain)
2
6
4
6
6
9
11

13

31

22
38
37

58
33

43

→
Meijo Treatment Plant

60%

4.smell bad

57→
Injection point of TRWKR

70%→
Nagoya port

Ratio of odor level(%)

80%

3.smell86→
Confluence of the Shonai River

2.smell little→
Confluence of the Shinhorikawa River

1.no smell
100%

40%

1st Stage - 6th Stage

0%
Minatoshin
Brdg －- Ohseko
Brdg
Minatoshinbashi
OhsekoBrdg－ - Matsushige
Matsushige－ OhsekoBrdg
brig.
Matsushige brig.
Asahi brig.
OhsekoMatsushige
Brdg
Aasahi
Brdg

Asahi
Brdg
Asahi
－ Johoku brig.
Jyouhoku
Brdg

Jyouhoku
JohokuBrdg－ Sanage Brdg
brig.
SanageSanage
Brdg
Sanage－ Sakae brig.
Sakae
Brdg

Note) 0% data is not displayed Ratio of “no smell”& ”smell little” between Asahi Bridge and the Matsushige
Bridge was lower than other area.

57

Smell

1st Stage - 6th Stage(With TRWKR, No Rain)
Sanage Brige- Minatoshinbashi Bridge

100%
90%
Ratio of smell level(%)

80%
70%

6
12

1.no smell

2
5
8

7

15

3.smell

4.smell bad

8

9
7

31

11

11
10

5.smell too bad

3
5
24

37

60%
50%

2.smell little

30

28

36

40%

20%

68

61

30%
39

48

42

37

10%
0%
1st stage

2nd stage

3rd stage

4th stage

5th stage The smell condition was slightly improved.

6th stage

58

Floating Garbage

1st Stage - 6th Stage■Artificial Garbage:
Plastics(shopping bag, plastic bag, cup noodle vessel, foam polystyrene
tray, plastic bottle, etc.), can bottle, cigarette (box, butt)(With TRWKR, No Rain)
Number of garbage per one
survey5

all area4

decrease
3
2

2.5
2.2
1.6
1.5
1.4

1st Stage
2nd Stage
3rd Stage
4th Stage
5th Stage
6th Stage

Number of Survey
1st stage：145
2nd stage：255
3rd stage：191
4th stage： 54
5th stage：119
6th stage： 66

decrease

0.7 0.4
0.4 0.5
0.4
0.2
0.2
0.3
0.3
0.3
0.1 0.1 0.2
0.1
0.10.1 0.1 0.10.1
0.0
0.0
0.0
0.00.00.0

10
Plastics

Can

BottlePaper
type of artificial garbage

 The amount of Plastics and Can decreased

Cigarette70Garbage on the Street 1 Stage - 6 Stage
st

th

5
4

2nd Stage (all area)
3rd Stage (all area)
4th Stage (all area)
5th Stage (all area)
6th Stage (all area) Frequency of the artificial garbage on the street
is on the decreasing trend

3

2.5

2

0.6
0.4

cigarette stub

0.4

cigarette box

paper bags

paper carton

glass bottles

can

0.2

0.1

0.0
city designated garbage bagwith garbage

0.0

other paper

0.4

0.3

shopping bag with garbage

0.2

plastic bottle

pot noodle vessel

plastic bags

0other plastic

0.0

0.3

other tray

0.3

foam tray

0.4

0.8

magazines

0.6

newspaper

0.9

1

shopping bags

frequency (Numbers/ten survey times)(With TRWKR, No Rain)

73

Living Things
Article in the Newspaper(Nov. 16th ,2009, The Chunichi Shinbun)

Takahiro UMEMOTO, the chairman of executive committee of “theHorikawa Sen-nin Chosatai” (Kurokawa River Dream Team） andHiroaki WADA(Citizens Environmental Foundation, NGO)
captured these fish in Horikawa

Photo by
Photo by
Kawasemi (Halcyon) Survey Group Goyousui-ato-gaien-aigokai
Survey Group

76

Improvement of Citizens’ Awarenessthrough Workshops, etc.

Horikawa Revitalization Forum“Toward the Revitalization of the urban river, Horikawa”
Meihoku Elem. School Workshop
Report by Goyousui-ato-gaien-aigokai
Survey Group

Marunouchi J.H.School Experiential boarding at Horikawa
Host: Nagoya Host Lions Club
Support: Nagoya Horikawa Lions Club
The tour to the construction site (Horikawa-Uganstormwater reservoir for pollution control)
Report by Yurinokai Survey Group94

Improvement of Citizens’ Awarenessthrough Workshops, etc.

Higashi Tsukiji Elem. School Workshop
Report by Bureau
Support：Horikawa River General Development Office,Nagoya City

Open-air workshop - water quality survey in Higashi-Tsukiji Elem. School
Conducted by Kojo Survey Group
Report by Bureau

94Improvement of Citizens’ Awarenessthrough Workshops, etc.

Marunouchi J.H.School
Experiential boarding at Horikawa
Host：Nagoya Host Lions Club
Support：Nagoya Horikawa Lions Club
Experimental Facility for water quality improvement
Report by Bureau,
Goyousui-ato-gaien-aigokai Survey Group

Tsuji Elem. School, Open-air workshop
Report by Goyousui-ato-gaien-aigokai Survey Group94

Progress of citizens’ awareness activityof Free Survey Groups and Horikawa Cheering Groups

城北橋下流にEM団子１０００個を投入
主催：名古屋市高年大学環境学科２２期調査隊
応援：大同大学大東研究室
報告：事務局

堀川ごみ取り大作戦・ＥＭ団子投入イベント
主催：名古屋堀川ライオンズクラブ
応援：鯱城・堀川と生活を考える会調査隊
大同大学調査隊
三河湾浄化市民塾
シーキューブ清流堀川調査隊

ゴンドラ体験乗船会
赤松広隆農相来場
仮称「ゴンドラクラブ」を立ち上げ
報告：御用水跡街園愛護会調査隊

猿投橋と北清水橋の横断幕が復活 有限会社クロス技研
報告:事務局

城北線ウォーキング「堀川の写真展」
報告：御用水跡街園
愛護会調査隊

あったか交流カフェサロン「堀川にぎわいづくり－2010年は堀川開削400年！」
報告：事務局

あすなろ歩こう会
報告：御用水跡街園
愛護会調査隊95

Progress of citizens’ awareness activityof Free Survey Groups and Horikawa Cheering Groups

自由研究 ひょっとこ調査隊
尾頭橋などで実施した３年間の調査結果
http://www.horikawa1000nin.jp/katudou/2010-01-16-hyottkotai.htm
清掃活動 地球倶楽部調査隊

堀川ごみ取り大作戦
主催：名古屋堀川ライオンズクラブ
応援：鯱城・堀川と生活を考える会調査隊
大同大学調査隊
三河湾浄化市民塾
シーキューブ清流堀川調査隊

なごや北ホームニュース
２００９年１２月１３日(土）より清掃活動 中日本建設コンサルタント㈱かわせみ調査隊、かるがも調査隊、かもめ応援隊
清掃活動 御用水跡街園愛護会調査隊

96Progress of citizens’ awareness - event -第２回木曽川がつなぐ山とまち
インターネットフォーラム
報告：事務局

上下流交流イベント「エコ市」
報告：名古屋市上下水道局

木曽流域市民放送局

上下流交流事業「ほりかわ楽市楽座」

97

Progress of citizens’ awareness - event -ヤマハ音楽教室
マラソンコンサート

水上の舞踏会
早稲田大学生バレリーナ「岩本渡と堀川ＪＡＺＺ
カルテット」による演奏

名古屋北高校の合唱部
員 と市民コーラス隊

報告：事務局、御用水跡街園愛護会調査隊

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