Horikawa Sen-nin Chosatai 2010
(Horikawa River Thousand Citizen Survey Network 2010)

Summary Meeting for the 10th Stage(Sep. 11st – Dec. 16th 2011）

Horikawa River Pilot Project- Transmission of Raw Water from the Kiso River (TRWKR) 1.Purpose: To verify the clarification effects of TRWKR with citizens(1) Develop a new clarifying measures(2) Assess the influence on ecosystem(3) Sustain and enhance citizens’ activity(4) Develop citizens’ awareness in entire Horikawa river basin
2. Water source and Volume of transmission of raw water(1) Water source
Kiso River: Kiso River System (first grade river)(2) Volume of transmission of raw water
Maximum 0.4m3/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 and evaluation after the stop of TRWKR）(2) TRWKR period: about 3 years (from Apr. 22nd 2007 to Mar. 22nd 2010)

Horikawa Sen-nin Chosatai (HSC) 2010
■The formation of Horikawa Sen-nin Chosatai (HSC) (April 22nd 2007)
With a viewpoint and a sense of citizens, the survey of the clarification effect of
TRWKR started.

■The survey with a view point and a sense of citizens
・Clearness ・Transparency ・Color ・smell ・Garbage ・Living things, etc.

■Increase of Transmission Volume from the Shonai River(additional pilot project)(1) Water Source:
Shonai River(2) Transmission Volume: Usual
Max. 0.3m3/sec
Increased
Max. 0.7m3/sec(3) Experiment Period: 1st Oct. – 31st Dec. 2010(4) Period of Increased Transmission Volume: Oct. 5th – Nov. 2nd 2010

Transmission of Raw Water from Kiso River（TRWKR）■TRWKR：0.4m3/s ■TRWKR period : From Apr.22nd 2007 to Mar.22nd 2010
Kiso River

InuyamaNarutoShonai River

Motoiri Sliceway

Shonai irigation weir

Yada River
Sanage Bridge
Kitashimizu Bridge
Jouhoku Bridge

DaikoRiver
Trunk Line

Existing aqueduct

Provisional raw water Transmission from Shonai River

Naya Bridge
Shinsuzaki Bridge
Matsushige Bridge
Matsushige Lock Gate
JR・Meitetsu line

Oto Bridge
Oseko Bridge

Shin-horikawa River

Nakagawa Canal

Horikawa River

Nagoya Station

Raw water transmission
Meijo Water route for Pilot project
Treatment Center
Nagoya Castle
Nabeyaueno Water
Purification plant
Asahi Bridge

Kiso River Inuyama Intake

Sanage Bridge

Daiko River trunk line

JR Tokaido shinkansen

Nagoya Port

Kizaemon Bridge
Koshin Bridge
Horikawa Tide Gate

6

TRWKR point : Horikawa River・ the downstream section below Sanage BridgeResults of TRWKR
Period：April 22nd 2007 - March 22nd 2010

Survey Period

Days ofDays of
TRWKR
Period (％：Days of TRWKR/Daysof Period/×100)

1st stage

April 22nd 2007～June 30th 2007
Interval

2nd stage

September 8th 2007～December 16th 2007
Interval

3rd stage

April 1st 2008～June 30th 2008
Interval

4th stage

September 28th 2008～December 16th 2008
Interval

5th stage

April 1st 2009～June 30th 2009
Interval

6th stage

September 27th 2009～December 16th 2009
Interval (Until the stop of TRWKR)
December 17th 2009～March 22nd 2010
Total

70
69
100
106
91
89
80
105
91
88
81

52 (74%)41
84 (84%)86
81 (89%)39
50 (63%)93
82 (90%)63
60 (74%)

96

92

1,066

823 (77%)

Note) It counts as one of “Days of TRWKR “ if just a little raw water is transmitted to Horikawa.

Increase of transmission of raw
water from Shonai River■ Transmission of raw water from Shonai River 0.3m3/s→0.7m3/s（＋0.4m3/s）■ The term of increasing flow : Oct. 5th to Nov. 2nd 2010

No increase

increase

8

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

start

now

Apr.22th 2007

Feb.20th 2012

Fixed Point
Observation Groups

55 groups
497 persons

89 groups
894 persons

Free Survey Groups

22 groups
234 persons

39 groups
644 persons

Horikawa CheeringGroups

88 groups
1,531 persons

2,251 groups
19,796 persons

Total

165 groups
2,262 persons

2,379 groups
21,334 persons

9Survey period and Number of reports
Survey period
1st stage

spring～early summer/Apr.22nd～Jun.30th 2007
Jul.1st ～Sep.7th 2007

2nd stage

Autumn～early winter/Sep.8th～Dec.16th 2007
Dec.17th 2007～Mar.31st 2008

3rd stage

spring～early summer/Apr.1st～Jun.30th 2008
Jul.1st ～Sep.27th 2008

4th stage

Autumn～early winter/Sep.28th ～Dec.16th 2008
Dec.17th 2008～Mar.31st 2009

5th stage

spring～early summer/Apr.1st～Jun.30th 2009
Jul.1st ～Sep.26th 2009

6th stage

Autumn～early winter/Sep.27th～Dec.16th 2009
Dec.17th 2009～Mar.31st 2010

7th stage

spring～early summer/Apr.1st～Jun.30th 2010
Jul.1st ～Sep.11th 2010

8th stage

Autumn～early winter/Sep.12th～Dec.17th 2010
Dec.17th 2010～Mar.31st 2011

9th stage

spring～early summer/Apr.1st ～Jun.30th 2011
Jul.1st ～Sep.10th 2011

10th stage

Total

Autumn～early winter/Sep.11th～Dec.16th 2011

Reports
２５８
１３４
３８３
１０３
２４５
６４
１５２
１００
１４５
５４
１２０
８１
１１１
44
104
72
１１2
42
133
2,457

11

The main measures of the pilot projectMeasures

2007

2008

2009

2010

2011

1st.

3rd.

5th.

7th.

9th.

2nd.

4th.

6th.

8th.

10th.

TRWKR
(0.4m3/s)
Increase of raw watertransmission from the Shonai
River(＋0.4m3/s)

The main measures implemented by City of Nagoya
Measures

2007

2008

2009

2010

2011

1st.

3rd.

5th.

7th.

9th.

2nd.
Advanced water treatment at
the Meijo water treatment
center
The Horikawa Ugan Rain-water
Reservior for pollution controll

4th.

6th.

8th.

10th.

The facilities which started the services after the stop of TRWKR■ Improvement of the quality of treated water
The additional filtration of treated water at the Meijo Water Treatment Center
leads to the improvement of quality of the water sluiced into Horikawa River.
Meijo Water Treatment Center(Advanced water treatment)
Solution: conventional activated sludge process ＋ rapid filtration
Launch(rapid filtration): May. 2010⑤⑥

■ Improvement of combined sewer system
By capturing and storing first flush with high-pollution load temporarily,
the frequency of overflow from the sewer outlet can be reduced.

④

Horikawa Ugan Rain-water Reservoir
for pollution control③②

Volume: 13,000m3
Coverage Area: 633ha①

Launch: Sep. 2010
凡例
対策済み区域
建設中の区域17

Summary of the clarification effects by TRWKRVerification of the clarification effects due to TRWKR
Item

Impression ofclearness

Transparency

ＣＯＤ

BubbleSmell

Minatoshin Bridge Oseko Bridge～～Oseko Bridge
Matsushige Bridge

Matsushige Bridge～Asahi Bridge

Asahi Bridge～Johoku Bridge

Johoku Bridge～Sanage Bridge○

Meijo Water Treatment Centerstarted the service of Advanced
water treatment in May 2010.

○

Horikawa Ugan Rain-water
Reservoir started the service ofpollution control in Sep. 2010.

1st - 6th stage (during TRWKR)

-

○

○

spring ～ early summer

-

●

●

autumn ～ early winter-

1st - 6th stage (during TRWKR)-

spring ～ early summer-

autumn ～ early winter-●

1st - 6th stage (during TRWKR)-○

spring ～ early summer-

autumn ～ early winter-

1st - 6th stage (during TRWKR)-

spring ～ early summer-

autumn ～ early winter-

1st - 6th stage (during TRWKR)-

spring ～ early summer-●

autumn ～ early winter

-

●

note

●
○
●
●
○

○
●

○

○
●
○

○

●

Note） ○：water quality was improved during TRWKR.
Improvement of water quality is verified●：water quality became worse after the stop of the TRWKR(or it can be said that TRWKR was necessary to maintain water quality.)

・It was confirmed that the water quality tended to improve during TRWKR between Sanage Bridge and Matsushige
Bridge.
・Although changes of the water quality are different according to items and stages, it was confirmed that the water
quality tended to deteriorate after the stop of TRWKR between Sanage Bridge and and Matsushige Bridge.
→In this result, the TRWKR was considered to have made good effects on the water quality between Sanage Bridge
and Matsushige Bridge.

・1st – 6th stage ： TRWKR
・7th – 9th stage ： No TRWKR
・No Rain on the day and the previous day

Impression of Clearness

Shin-Horikawa River confluence

Not enough data60
50 5050
40

40

20

34

Nagoya Port

Impression of clearness (%)

80

27
23
18

16

12
6

28

25
21

23

20
decreasedecrease11
Increase
50 0 0 0029

Increase
16

Injection Point of TRWKR

100

100

Meijo Water
Treatment Center

Apr.22～Jun.30 2007 1st stage
Sep. 8～Dec.16 2007 2nd stage
Not enough data
Apr. 1～Jun.30 2008 3rd stage
Sep.28～Dec.16 2008 4th stage
100 100100100
Apr. 1～Jun.30 2009 5th stage
Sep.27～Dec.16 2009 6th stage
Apr. 1～Jun.30 2010 7th stage
Sep.11～Dec.17 2010 8th stage
93
Apr. 1～Jun.30 2011 9th stage
Sep.11～Dec.16 2011 10th stage
87 87
The ratio of “comfortable”,“ a little comfortable”
and “neither” between Matsushige Bridge andJohoku Bridge was low.
73
→ It is considered that the impressionof clearness is not good.
62
61
60
57
57
56 56
Not
enoughdata
54
53 decrease
50
50 50
45
43
42
40
39
38
39 39
37
36
36

12
8

Increase00
Numbers of Data

Minatoshin Bridge ～Oseko Bridge
3 2 5 2 21

0 0 0 0

Oseko Bridge ～Matsushige Bridge

15 35 33 9 29 25 30 21 25 35

Matsushige Bridge ～ Asahi Bridge ～Johoku
Asahi Bridge
Bridge46 103 82 28 37 16 25 25 22 43

12 21 14 2 13 4 6

5 9 12

Johoku Bridge ～Sanage Bridge

37 47 42 11 30 17 24 16 20 23

Sanage Bridge ～Sakae Bridge
3

31 41 15 2 8 5■How did the impression of clearness change?
・The ratio of “comfortable”, “a little comfortable” and “neither”(1st,3rd,5th,7th,9th stage) was lower than(2nd,4th,6th,8th,10thstage).
The impression of clearness between Sanage Bridge and Matsushige Bridge improved during TRWKR (1st, 3rd, 5th stage), but
deteriorated after the stop of TRWKR* "comfortable", "a little comfortable" and "neither " are categorized as the acceptable range for citizens

8 5 5Transmission of raw water from the Shonai River

The ratio of “comfortable ","a little comfortable" and "neither ". *Impression of Clearness・・・from spring to early summer
・1st・3rd・5th stage：TRWKR
・7th・9th stage：No TRWKR
・No Rain on the day and the previous day

The ratio of “comfortable”, “a little comfortable” and “neither”. *Comparison between TRWKR and no TRWKR period
100
The average of 1st・3rd・5th stage: with TRWKR
The average of 7th・9th stage: after the stop of TRWKR

60

41

40

20

No data

Shin-Horikawa River
confluence

Not enough data

16％ decrease
15％ decrease
19

22

18
11
3

Meijo Water
Treatment center

From Johoku Bridge to Matsushige Bridge,
the remarkable improvement was seen during TRWKR.
37

35

Injection Point of TRWKR

From Sanage Bridge to Oseko Bridge, the ratio of “comfortable”,“a little comfortable” and “neither” decrease after the stop of TRWKR

Nagoya Port

Impression of clearness （％）

80

6

0
Minatoshin Bridge～
Oseko Bridge
010
Number of Data

Oseko Bridge～
Matsushige Bridge
55
77

Matsushige Bridge～
Asahi Bridge
47
165

Asahi Bridge～Johoku
Bridge15
39

Johoku Bridge～Sanage
Bridge44
109■ How did the impression of clearness (“from spring to early summer”) change after the stop of TRWKR?
→From Sanage bridge to Oseko Bridge, the ratio of “comfortable”, “a little comfortable” and “neither” decrease after
the stop of TRWKR. In this result, it was confirmed that the impression of clearness was improved during TRWKR.
Especially, it was from Johoku bridge to Matsushige Bridge where the remarkable improvement was seen during TRWKR.
* ”comfortable”, “a little comfortable” and ”neither” are categorized as the acceptable range for citizens

Impression of Clearness・・・from autumn to early winterThe ratio of “comfortable”, “a little comfortable” and “neither”. *Comparison between TRWKR and no TRWKR period

・2nd・4th・6th stage：TRWKR
・8th・10th stage：No TRWKR
・No Rain on the day and the previous day

100
The average of 2nd・4th・6th stage: with TRWKR
The average of 8th・10th stage: after the stop of TRWKR

67
58

60

From Johoku Bridge to Asahi Bridge,
the remarkable improvement was seen during TRWKR.
55

52

No data40
33

31

Meijo Water
Treatment center

20

46
15％ decreaseShin-Horikawa River
confluence

40

51

Injection Point of TRWKR

From Sanage Bridge to Matsushige Bridge, the ratio of “comfortable”,“a little comfortable” and “neither” decrease after stop of TRWKR

Not enough data

Nagoya Port

Impression of clearness （％）

80

0Minatoshin Bridge～
Oseko Bridge0
Number of Data 5

Oseko Bridge～
Matsushige Bridge
69
56

Matsushige Bridge～
Asahi Bridge
68
147

Asahi Bridge～Johoku
Bridge17
27

Johoku Bridge～Sanage
Bridge75
39■ How did the impression of clearness (“from autumn to early winter”) change after the stop of TRWKR?
→From Sanage bridge to Matsushige Bridge, the ratio of “comfortable”, “a little comfortable” and “neither” decrease
after the stop of TRWKR. In this result, it was confirmed that the impression of clearness was improved during TRWKR.
Especially, it was from Johoku bridge to Asahi Bridge where the remarkable improvement was seen during TRWKR.
* ”comfortable”, “a little comfortable” and ”neither” are categorized as the acceptable range for citizens

Impression of Clearness (from Sanage Bridge to Minatoshin Bridge)
Criterion for Judgment of “comfortable”, “a little comfortable”, and “neither”

Rate of criterion for judgment of impression （％）

water color

smell
1%

100%

transparency
3%

2%
2%

90%

bubbleliving thingsothersTRWKR period 4%
4%

7%

3%

11%

15%

garbage

21%

22%

10%

19%

■The reply of “Transparency”

26%

80%

48%

70%

45%

60%

45%

55%
2%

40%

2%

48%

3%

40%

11%

10%
39%

36%
22%

21%

No data

0%

2%

7%

20%

10%

45%

62%

30%
20%

was 40 ～ 60%.

50%

45%
60%
50%

26%

6%

1st stage 2nd stage 3rd stage 4th stage 5th stage 6th stage 7th stage 8th stage 9th stage

Number of Data0・1st stage ： No data
・2nd - 6th stage ：TRWKR
・7th – 10th stage：No TRWKR
・No rain on the day and the previous day

31

47

91

33

9

27

14

31

10th
stage
49

Criterion for Judgment of “a little Dirty” and “Dirty”
Rate of criterion for judgment of impression （％）

water color

smell
1%

100%

transparency

19%

80%

13%

60%

13%

4%

17%

8%
10%

8%

70%

24%

living things

3%

1%

90%
22%

bubbleTRWKR period

1%
5%

5%

garbage

14%

19%

4%

2%

2%

18%

14%

8%

13%
11%

others36%

18%■The reply of “Water color”
was 50 ～ 70%.

32%

13%

3%

6%

50%

10%
5%

40%
30%

56%

63%

57%

68%

69%
56%

20%
10%
0%

Number of Data

50%

52%

47%

No data
1st stage

2nd
stage

0

104

3rd stage 4th stage 5th stage 6th stage 7th stage 8th stage 9th stage
127

21

77

36

75

36

61

10th
stage
63

29

Impression of Clearness (from Sanage Bridge to Minatoshin Bridge)
2nd - 10th stage containing the extended period, both TRWKR and no TRWKRNo Rain on the day and Rain on the previous day

Minatoshin Bridge

Oseko Bridge

Matsushige Bridge

Asahi Bridge

living things
bubblegarbage

Rate of criterion for judgment of impression (%)

otherstransparency
smellwater color

90%

Oseko Bridge ～Matsushige Bridge
100%

100%
13%

13%

90%

1%

1%
17%

15%

20%

23%

70%

70%
51%

Matsushige Bridge ～Asahi Bridge
1%
1%

100%
90%

18%

2%
1%
14%

Increase

70%

18%

60%

6%

18%

Increase

TRWKR

Asahi Bridge ～Johoku Bridge
1%
1%

100%
6%

70%

Johoku Bridge ～Sanage Bridge
100%

9%
90%

90%
80%

80%

80%

80%

Sanage Bridge

Meijo Water
Treatment Center

Shin‐horikawa River confluence
Minatoshin Bridge ～Oseko Bridge

Johoku Bridge

24%

27%

60%

60%

50%

50%

50%

40%

40%

40%

40%

30%

30%

30%

30%

20%

20%

60%

60%

8%
15%

50%

50%
87%

40%

12%

3%

33%

46%

10%

10%
0%

Number of data

54%

30

53%

64%

Increase
41%

20%

20%

10%

10%

10%

59%

4%

30%

20%

0%

0%
①

55%

65%

13%

13%

80%
70%

3%

1%
5% 1%

3%
35%
25%

0%

0%

②

①

②

①

②

①

②

①

②

8

412

71

546

91

126

11

304

40

Not enough data①; No Rain on the day and the previous day ②; No Rain on the day and Rain on the previous day

In case of rain on the previous day ・・・

impression of smell increased

impression of transparency increased■ In case of rain on the previous day, how did the impression of clearness change?
→Between Sanage Bridge and Asahi Bridge, the impression of “Transparency” increased.
→Between Asahi Bridge and Oseko Bridge, the impression of “Smell” increased.

30

1st～6th stage： With TRWKRNo Rain on the day and the previous day
7th～10th stage ： No TRWKRNo Rain on the day and the previous day

Transparency

0
Number ofdata

50
Not enough data

No data

0 00 0
Minatoshin Bridge ～Oseko Bridge
3 2 5 2 2 1 0 0 0 0

59

83

87

56 54 56 57

84

90

The transparency was low
92 between Johoku Bridge and Asahi Bridge

87

79 77
53

65

61 60
52

Improved during
TRWKR

80
74
59

65
61
52
45

11 30 33 9 29 25 30 21 24 33

22 74 55 18 29 16 22 22 20 40

80

79 77

71 68

67
64

58
57 58
51
50
43
Improved during

Not enough data

Oseko Bridge ～ Matsushige Bridge ～Matsushige Bridge
Asahi Bridge

88

TRWKR

Injection Point of TRWKR

20

83

68
60
40

89

Shin-horikawa River confluence

80

Nagoya Port

transparency(cm)

93
87

95

Meijo Water Treatment Center

100100100

2nd stage Sep. 8～Dec.16 2007
4th stage Sep.28～Dec.16 2008
6th stage Sep.27～Dec.16 2009
8th stage Sep.11～Dec.17 2010
10th stage Sep.11～Dec.16 2011

63
57 59

62 64
55 55

42
Not enough data

Asahi Bridge ～Johoku Bridge

Johoku Bridge ～Sanage Bridge

Sanage Bridge ～Sakae Bridge

9 16 9 1 11 3 6 5 8 12

13 35 32 8 26 17 20 16 20 23

3 41 13 2 8 3 5 8 5 9Transmission of raw water from Shonai River

1st stage Apr.22～Jun.30 2007
3rd stage Apr. 1～Jun.30 2008
5th stage Apr. 1～Jun.30 2009
7th stage Apr. 1～Jun.30 2010
9th stage Apr. 1～Jun.30 2011

Note) The value of 100cm or more was treated as 100cm■ How did transparency change？
→ “Spring～Early summer(1,3,5,7,9th stage)” was lower than “Autumu～Early winter(2,4,6,8,10th stage)”.
Transparency level was improved between Sanage Bridge and Johoku Bridge, in “Spring～Early summer(1,3,5th stage)” during TRWKR.

The transparency between Johoku Bridge and Asahi Bridge is especially low.
＊ “① comfortable”～ “③ neither” are categorized as the acceptable range for citizens.

32

1st, 3rd, 5th stage：TRWKR
7th and 9th stage：No TRWKRNo rain on the day and the previous day

Transparency ・・・ Spring～Early summer

Comparison between the transparency during TRWKR （the average of 1st, 3rd, 5th stage）
and the transparency after the stop of TRWKR（ the average of 7th, 9th stage）
The average of 1st・3rd・5th stage: with TRWKR
The average of 7th・9th stage after the stop of TRWKR

Transparency level was improved
between Johoku Bridge and Asahi Bridge

60

40

20

0

No data

Minatoshin Bridge ～Oseko Bridge

Number of data

10

0

56

57

58

10cm
57 decrease

59

47

Oseko Bridge ～Matsushige Bridge
73

54

Matsushige Bridge ～Asahi Bridge
106

42

Asahi Bridge ～Johoku Bridge
29

66
61

14

Injection Point of TRWKR

68

The acceptable range for citizens
70cm or more

Meijo Water Treatment CenterNot enough data

Shin-HorikawaRiver confluence

80

Nagoya Port

Transparency(cm)100Transparency level decreased (became worse)
after the stop ot TRWKR between Sanage Bridge and Asahi Bridge

Johoku Bridge ～Sanage Bridge
7140Note) The value of 100cm or more was treated as 100cm■ How did the transparency (Spring～early summer) change after the stop of TRWKR?
→ Transparency level decreased (became worse) after the stop ot TRWKR between Sanage Bridge andAsahi Bridge. Therefore we made sure that the transparency was improved by TRWKR. Especially,
improvement by TRWKR appeared between Johoku Bridge and Asahi Bridge.
And, in spring～early summer (1,3,5,7,9th stage), the transparency was lower than 70cm(citizens'
acceptable transparency) in all sections.

33

Change in transparency・・・Autumn～early winter2nd, 4th, 6th stage：With TRWKRNo rain on previous day and the day
8th, 10th stage：Without TRWKRNo rain on previous day and the day

Comparison between during TRWKR and after stopping TRWKR
Comparison of average of 2nd, 4th, and 6th stage and of 8th and 10th stage

The average of 2nd, 4th and 6th stage: With TRWKR

The average of 8th and 10th stage: After stopping TRWKR

The transparency decreased between Sanage Bridge and Oseko Bridge after stopping TRWKR
98

100

Less data

89

85

89

11cm decrease
78

80

72

Injection point of TRWKR

54

Meijo Water
Treatment CenterNo data

Shin-horikawa River

40

20

10cm decrease
82

61

60

Nagoya port

Transparency (cm)

Acceptable range of citizens
More than 70cm

Transparency was improved
between from Sanage Bridge
to Johoku Bridge and from
Asahi Bridge to Oseko
Bridge#N/A

0Minatoshin Bridge～
Oseko Bridge

Number of Data

5

Oseko Bridge～
Matsusige Bridge

0

64

54

Matsusige Bridge～
Asahi Bridge

108

62

Asahi Bridge～Johoku
Bridge20

17

Johoku Bridge～
Sanage Bridge

60

39■ How did transparency changed?
→The transparency decreased between Sanage Bridge and Oseko Bridge after stopping TRWKR. This
fact shows that TRWKR improved the transparency. The improvement by TRWKR was observed
specially between Sanage Bridge and Johoku Bridge, Asahi Bridge and Oseko Bridge. In the survey
on autumn and early winter (2nd, 4th, 6th, 8th, and 10th stage) ,transparency between Johoku
Bridge and Aasahi Bridge was less than acceptable range of citizens;70 cm.
*The values more than 100cm were handled as 100cm.

34

Relations of the impression of clearness and theaverage of transparency (translucency)
2nd stage ～10th stage: No rain including data out of period
Impression of clearness: evaluated by translucency
All sections ( including the upper reaches)

Evaluated by transparency
透視度(cm)、透明感で評価(cm) and translucency

水の汚れの印象と透視度(透明感）の関係
Relations of the impressionof clearness and the average of transparency (translucency)
100“Clear ～ Neither is acceptable range of citizens

86

80
71

80
60
40
20
0

Transparency ismore than 70cm

65

62

y = -6.3x + 91.7
R2 = 0.9757

dirty
どちらとも
やや
a littleやや
neither
0Comfortable
2
4
きたない
きれい
little dirty
きれい いえないa きたない
comfortable
Impressionof clearness: evaluated by translucency
水の汚れの印象_透明感で評価
The acceptable range of citizens fortransparency is more than 70 cm.
This becomes one index to aim at the
improvement of the impression of clearness.
*The values more than 100cm were handled as 100cm.

36

The average of transparency if it rained on the previous day
Sanage Bridge ～ Minatoshin Bridge

・1st～10th stage including all data ( TRWKR and No TRWKR )・No rain on the day

No rainon the previous day

Rainon the previous day

100
90
81

71

70

71

Minatoshin Bridge～Oseko Bridge

Number of data

55

35

10

48

48
Injection Point of TRWKR

30

62

Meijo Water
Treatment Center

40

0

Citizen feels OK above 70cm

69

Shin-Horikawa River confluence

50

10

12cm

21cm

60

20

70

58

Nagoya Port

Transparency（cm）

80

Transparency became low after it rained

10cm

Oseko Bridge～
Matsushige Bridge
442

79

Matsushige Bridge～Asahi Bridge
455

82

Asahi Bridge～
Johoku Bridge
127

11

Johoku Bridge～
Sanage Bridge
30546Note） The value of 100cm or more was treated as 100cm■ How did the transparency change if it rained on the previous day ?
→Transparency became low after it rained . Especially, the transparency became
lower between Asahi Bridge and Minatoshin Bridge .

37

・1st-6th stage ： TRWKRNo rain on the day and the previous day
・7th-10th stage ： No TRWKRNo rain on the day and the previous day

Change in COD
1st.stage Apr.22～Jun.30 2007
4th.stage Sep.28～Dec.16 2008
7th.stage Apr.1～Jun.30 2010
10th.stage Sep.11～Dec.16 201116
14

14 COD improved
during TRWKR

13
11

12

13 13

11 11

9

8

2

Nagoya Port

4

9

6

6

44

No data

0000

0Minatoshin Bridge～Oseko Bridge
Number of data

3 2 5 2 2

1

Not enough data

11

13
12

12 1212

9

11

11 11
10
9

9

9

7

7
6

14 34 32 9 28 22 30 17 24 35

Matsushige Bridge～Asahi Bridge
27 63 55 19 28 16 22 25 22 43

Asahi Bridge～
Johoku Bridge
12 17 14 2 12 4 6 5 9 12

10

10
99 9

88

8

Oseko Bridge～
Matsushige Bridge

0 0 0 0during TRWKR
13

13

10

9
7

14 COD improved

during TRWKR

Meijo Water
Treatment Center

1015

15 COD improved

12

1010
Shin-Horikawa River confluence

COD(mg/L)

16
15

COD between Matsushige Bridge andMinatoshin Bridge is lower than between
Sanage Bridge and Matsushige Bridge.

3rd.stage Apr.1～Jun.30 2008
6th.stage Sep.27～Dec.16 2009
9th.stage Apr.1～Jun.30 2011

Johoku Bridge～
Sanage Bridge
31 37 41 10 30 17 20 16 20 23

9

999
8
7

Transmission of raw water from Shonai River18

2nd.stage Sep.8～Dec.16 2007
5th.stage Apr.1～Jun.30 2009
8th.stage Sep.11～Dec.17 2010

Injection Point of TRWKR

20Sanage Bridge～
Sakae Bridge
4

9 13 2 8

3 5 8 5 9Not enough data
Not enough dataNote） The value of 20mg/l or more was treated as 20mg/l■ How did COD change ?
→ 「spring～early summer(1st,3rd,5th,7th,9th stage)」 is higher than 「autumn～early winter(2nd,4th,6th,8th,10th stage)」.
During TRWKR period 「spring～early summer(1st,3rd,5th stage)」, COD was improved between Sanage Bridge andMatsushige Bridge.
COD between Matsushige Bridge and Minatoshin Bridge is lower than between Sanage Bridge and Matsushige Bridge.

40Change in COD・・・spring～early summer

・1st・3rd・5th stage ： TRWKRNo rain on the day and the previous day
・7th・9th stage： No TRWKRNo rain on the day and the previous day

Comparison between average COD of 1st, 3rd, 5th stage ( TRWKR period )and average COD of 7th, 9th stage ( after the stop of TRWKR )20

Improvement of COD can not be checked by TRWKR

16

14
13

8

7

2

Nagoya Port6

No data

0Minatoshin Bridge～Oseko Bridge
Number of data 10
0
Not enough data

11

11
9

11

9

Oseko Bridge～
Matsushige Bridge
73

54

Matsushige Bridge～Asahi Bridge
110 46

Asahi Bridge～
Johoku Bridge
15
39

Injection Point of TRWKR

10

13

Meijo Water
Treatment Center

12

Shin-Horikawa River confluence

COD(mg/L)

14

4

The average of 7th,9th stage: after the stop of TRWKR

The average of 1st,3rd,5th stage: with TRWKR

18

Johoku Bridge～
Sanage Bridge
102 44■ How did COD change after the stop of TRWKR ( spring～early summer )?
→After the stop of TRWKR the value of COD was same.
Improve of COD was not found by TRWKR.

Note） The value of 20mg/l or more was treated as 20mg/l

41

Change in COD・・・Autumn～earlywinter

2nd,4th,6thstage：TRWKR
8th and 10th stage：No TRWKRNo rain on the day and the previous day

Comparison between average COD of 2nd,4th,6th stage (TRWKR period)
and average COD of 8th and 10th stage (after the stop of TRWKR)
20
nd

th

th

The average of 2 ,4 , and 6
第２・４・６ステージの平均：導水あり
stage: with TRWKR

18

th

th

The average of 8 and 10 stage
第８・１０ステージの平均：導水停止後: after the stop TRWKR

COD between Sanage Bridge and Johoku Bridge, Asahi Bridge and Matsushige Bridge increase after the stop of TRWKR

16

10

Not enough data

8

8
6

4
2
0

Nagoya port

6

No data

Minatoshin Bridge
港新橋～大瀬子橋～Oseko Bridge0
Numbers
5of data8

Oseko Bridge～
大瀬子橋～松重橋
Matsushige
Bridge65
52

Matsushige Bridge
松重橋～朝日橋～Asahi Bridge
98
68

Asahi Bridge～
朝日橋～城北橋
Johoku Bridge
23
17

13

9
Injection Point of TRWKR

12Shinhorikawa River

CO D ( m g/ L )14

Meijo Water Treatment center

A remarkable improvement was foundbetween Sanage Bridge and Johoku Bridge
12
Increase
11
4mg/L
11
11

Johoku Bridge～
城北橋～猿投橋
Sanage Bridge
64
39■ How did COD (Autumn～early winter)change after the stop of TRWKR ??
→COD between Sanage Bridge and Johoku Bridge, between Asahi Bridge and Matsushige Bridge
increased (worsen) after the stop of TRWKR.
In this downstream section, improvement by TRWKR was verified.
A remarkable improvement was found between Sanage Bridge and Johoku Bridge.

42Note） The value of 20 mg/l and more was treated as 20mg/l

The average of ＣＯＤ after rain on the previous day.
Sanage Bridge～Minatoshin Bridge
・ During 1st～10th stage
・ No rain on the day

No rain on the day
20

No rain on the day and rain on the previous day

COD improved after rain on the previous day.

18

13

13

Shinhorikawa River

10
8
6
4
2
0

Numbersof Data

65Minatoshin Bridge～ Oseko Bridge
36

10

Meijo Water
Treatment Center

12

12

Nagoya Port

ＣＯＤ (mg/L）

14

Injection Point of TRWKR

16

11

10
8

8

Oseko Bridge～
Matsushige Bridge
4５２

８０Matsushige Bridge～
Ashi Bridge
4７７

Asahi Bridge～
Johoku Bridge

９２■ How did COD change when it rained on the previous day？
→After rain on the previous day, COD improved between Sanage Bridge andAsahi Bridge.
COD improved between Minatoshin Bridge and Oseko Bridge, too.

143

9

Johoke Bridge～
Sanage Bridge
15

360

5４

44

The occurrence of bubbles(Sanage Bridge～Minatoshin Brigde・each area)

TRWKR

the frequencyof the・ 1st～6ｔｈ stage： TRWKR
・ 7th～10th stage：No TRWKR・ No rain on the day and the previous day

TRWKR

occurrence ofbu

bbles decreas
ed

TRWKR

TRWKR

No data

TRWKR

Decreasing thefrequency ofthe occurrenceof bubbles

The ratio of “Bubbles from the bottom of the river” is higher.

■ How did the bubbles change during
TRWKR?
→The frequency of occurrence of bubbles
decreased between Sanage Bridge andJohoku Bridge, Asahi Bridge andMatsushige Bridge during TRWKR.

47The occurrence of bubbles・・・Spring～Early Summer
Comparison during and after TRWKR(1st/3rd/5th Stage and 7th/9th Stage)
Minatoshin Bridge Ohseko Bridge

Matsushige Bridge

1st,3rd,5th Stage： TRWKRNo rain on the day and the previous day： No TRWKR
7th,9th StageNo rain on the day and the previous day

Asahi Bridge

Johoku Bridge

Meijo Water
Treatment Center

Confluence of Shin‐Horikawa River

Bubbles flowed from the downstream

Bubbles flowed from the downstream

Bubbles flowed from the downstream

Bubbles flowed from the downstream

Bubbles flowed from the upstream

Bubbles flowed from the upstream

Bubbles flowed from the upstream

Bubbles flowed from the upstream

Bubbbles floated from the bottom on the river

Bubbbles floated from the bottom on the river

Bubbbles floated from the bottom on the river

80%
70%
60%

90
50%
40%
30%
20%
10%

10
0%
1st,3rd,5thstage

7th,9th stage

10

0

Bubbbles floated from the bottom on the river

100%
90%
80%
70%
60%

79

86

50%
40%
30%
20%

1
10%
0%

6

2

10
3

13

1st,3rd,5thstage

7th,9th stage

72

52

100%
90%
80%

44

51

70%
60%

1
2

50%

2

Bubbles"fromthe bottom
40%of the river"is higher
30%
53

20%

47

10%
0%

100%

100%
90%
80%
70%

73

60%
50%
40%
30%

92

19％
Increased

20%

20

10%
0%

5

3

7

1st,3rd,5thstage

7th,9th stage

1st,3rd,5thstage

7th,9th stage

157

43

38

13

The occurrence of bubbles & constitution rate(%)

90%

Not enough data

Bubbles were not seen

The occurrence of bubbles & constitution rate(%)

100%

Johoku Bridge～
Sanage Bridge

Asahi Bridge～
Johoku Bridge

Bubbles were not seen

The occurrence of bubbles & constitution rate(%)

Bubbbles floated from the bottom on the river

The occurrence of bubbles & constitution rate(%)

The occurrence of bubbles & constitution rate(%)

Bubbles flowed from the upstream

TRWKR

Bubbles were not seen

Bubbles were not seen

Bubbles flowed from the downstream

Number of data

Matsushige Bridge～
Asahi Bridge

Oseko Bridge～
Matsushige Bridge

Minatoshin Bridge～
Oseko Bridge
Bubbles were not seen

Sanage Bridge

90%
80%
70%

58

64

60%
50%
40%
30%

24

9

20%
10%

18

27

0%
1st,3rd,5th
stage
102

7th,9th stage
45

No data

The frequancy of bubbles increased remarkably, "between Johoku Bridge and Asahi Bridge".
■How did the bubbles change after TRWKR?
（spring～early summer)→The frequency of occurrence of bubbles increased 19%
between Johoku Bridge to Asahi Bridge after TRWKR.
The ratio of “bubbles from upstream” increaced.

■ How about bubbles?
(spring～early summer)→The rate of "from the bottomof the river" is higher between
Asahi Bridge and Matsushige
Bridge.

49

The occurrence of bubbles・・・Autumn～Early Winter

100%
90%
80%
70%
60%
50%

100

40%
30%
20%

Not enough data

10%

No data0%

Numberof data

2nd,4th,6th
stage

8th,10th
stage

5

0

The occurrence of bubbles & constitution rate(%)

The occurrence of bubbles & constitution rate(%)

Bubbles flowed from the upstream

Johoku Bridge～
Sanage Bridge

Bubbles were not seen

Bubbles were not seen

Bubbles flowed from the downstream

Bubbles flowed from the downstream

Bubbles flowed from the upstream

Bubbles flowed from the upstream

Bubbles flowed from the upstream

Bubbbles floated from the bottom on the river

Bubbbles floated from the bottom on the river

Bubbbles floated from the bottom on the river

100%
90%
80%
70%
60%
50%

96

98

40%
30%
20%
10%

1
1

0%

2
2

2nd,4th,6th
stage

8th,10th stage

67

50

100%
90%

Bubbles"fromthe bottom
80%of the river"is higher
70%
60%

72
88

50%
40%
30%
20%
10%

■ How did the bubbles change after TRWKR?
（autumn～early winter)→There is no sections that the frequency of occurrence of
bubbles changed.

3
3
22

12

0%
2nd,4th,6th
stage

8th,10th stage

146

65

100%
90%
80%
70%
60%
50%

92

100

40%
30%
20%
10%
0%

Sanage Bridge

Meijo Water
Treatment Center
TRWKR

Asahi Bridge～
Johoku Bridge

The occurrence of bubbles & constitution rate(%)

Bubbles flowed from the downstream

The occurrence of bubbles & constitution rate(%)

Bubbles were not seen

Johoku Bridge

Matsushige Bridge～
Asahi Bridge

Oseko Bridge～
Matsushige Brid
Bubbles were not seenge
Bubbles flowed from the downstream

Minatoshin Bridge～
Oseko Bridge

Asahi Bridge

After TRWKR, the rate of the occurrence of bubbles did not change vey much

Confluence of Shin-Horikawa River

Bubbbles floated from the bottom on the river

Matsushige Bridge

44
2nd,4th,6th
stage

8th,10th stage

26

17

Bubbles were not seen
Bubbles flowed from the downstream
Bubbles flowed from the upstream
Bubbbles floated from the bottom on the river

The occurrence of bubbles & constitution rate(%)

Comparison during and after TRWKR(2nd/4th/6th Stage and 8th/10th Stage)
Minatoshin Bridge Ohseko Bridge

2nd・4th・6th Stage：TRWKRNo rain on the day and the previous day
8th・10th Stage： No TRWKRNo rain on the day and the previous day

100%
90%
80%
70%
60%

86

77

50%
40%
30%
20%
10%
0%

■How about bubbles(autumn～early winter)→The rate of "from thebottom of the river" is slighthigher between Asahi Bridge
and Matsushige Bridge.

1
8
5

10
13

2nd,4th,6th
stage

8th,10th
stage

73

39

50

1st～6th Stage：

The occurrence of bubbles(Sanage Bridge～Minatoshin Brigde・each area)

47

49

20%
0%

37

12
15

30

1st Stage

2nd Stage

33

47

2

Asahi Bridge～Johoku Bridge

The occurrence of smell_Constitution ratio(%)

53

100%

42
39
17

20

19
6

9
9

10

6

8

3rd Stage

4th Stage

5th Stage

6th Stage

7th Stage

8th Stage

9th Stage

10th Stage

42

11

30

17

24

16

20

23

5

10

Bad smell

Rather bad smell

Period of TRWKR

Smell

4

A little smell

5
5

33

5
5
5

17
0%

43

50

50

20

33

20

8
8

25

20

20

22

50

11

1st Stage

2nd Stage

3rd Stage

4th Stage

5th Stage

6th Stage

7th Stage

8th Stage

9th Stage

10th Stage

12

21

14

2

13

4

5

5

9

12

Matsushige Bridge～Asahi Bridge Bad smell
Rather bad smell
Period of TRWKR
100%
8
24
33
35
80%
50
49
60%
37
30
42
Y
40%
16
15
12
46
13
20%
16
14
13
11
6 4
11
11
4
The numberof Survey data 46

A little smell

Oseko Bridge～Matsushige Bridge
Bad smell
Rather bad smell
Smell
Period of transmission of raw water100%
Not enough data
80%
43
52
59
64
78
60%
80

A little smell

Not smell

31

33
61

62

23

29

18
40%

17

20%
0%

15

29

23
3

9

11
11

21

2nd Stage

3rd Stage

4th Stage

5th Stage

35

33

9

29

13
7

9

1st Stage

15

The numberof Survey data

15

7

3

21

24

9
9
9
11

13
10

10

6th Stage

7th Stage

8th Stage

9th Stage

10th Stage

25

30

21

24

35

Smell

A little smell

Not smell

4

5

17

Not enough data

80%
60%

32

50

67
100

100

100

100

40%
20%
0%

50

No data33
1st Stage

The numberof Survey data 3

2nd Stage

3rd Stage

4th Stage

5th Stage

6th Stage

7th Stage

8th Stage

9th Stage

10th Stage

2

5

2

2

1

0

0

0

0

Not smell

12
36

40
75

61

44
32
20

6
13
6

48

12

14
9
9

30

12

8

2nd Stage

3rd Stage

4th Stage

5th Stage

6th Stage

7th Stage

8th Stage

9th Stage

10th Stage

107

82

28

37

16

25

25

22

43

0%

1st Stage

Smell

7th～9th Stage：

Minatoshin Bridge～Oseko Bridge Bad smell
Rather bad smell
Period of transmission of raw water
100%

33

40

20

13

Not smell

20
20

4

Not enough data

20

25

20%

The numberof Survey data

70

75

29

38
42
The ra50 data
57Not enoughte of “ba “s
75
60% nd25
mell” ad smell” ,“rathe
decre
ases.
r bad
40%
46smell”
43
80%

44

65

The rate 68
82
of “
and “sme bad smell” , “rathller bad sm”
decrease
24
ell”
38 .

The numberof Survey data

The occurrence of smell_Constitution ratio(%)

Not smell

The occurrence of smell_Constitution ratio(%)

40%

A little smell

29

80%
60%

Smell

The occurrence of smell_Constitution ratio(%)

The occurrence of smell_Constitution ratio(%)

Johoku Bridge～Sanage Bridge
Bad smell
Rather bad smell
Period of TRWKR
100%

TRWKR
No rain in the day and the previous day
TRWKR
No rain in the day and the previous day

4

7 2■ How did the smell change during
TRWKR? （Spring～Early summer)→ “bad smell”,”rather bad smell” and“smell” decreased between Sanage
Bridge and Johoku Bridge, between
Asahi Bridge and Matsushige Bridge,
during TRWKR.

55

1st,3rd,5th Stage： TRWKRNo rain in the day and the previous day
7th,9th Stage ： TRWKRNo rain in the day and the previous day

Confluence of Shin‐Horikawa River
Rather bad smell
A little smell

100%
90%
80%
70%
60%
90
50%
40%
30%
20%
10%
10

No data0%

The numberof Survey data

1st/3rd/5thStage

7th/9th Stage100Not enough data

The occurrence of bubbles _Constitution ratio(%)

The occurrence of bubbles _Constitution ratio(%)

Bad smell
Smell
Not smell

Oseko Bridge～Matsushige Bridge
Bad smell
Smell
Not smell

90%
31
80%
53

50%

13％ 26
Increased

40%

17

60%

22

30%
10
20%
10%

8
12

0%

The numberof Survey data

Matsushige Bridge～Asahi Bridge

Rather bad smell
A little smell

100%

70%

Asahi Bridge

15
6

1st/3rd/5thStage

7th/9th Stage

77

54

Bad smell
Smell
Not smell

Meijo Water
Treatment Center

100%
90%

25

23

80%
70%
60%

36

38

50%
40%
17

30%

14

20%

14

17

11

11

10%
0%

The numberof Survey data

Asahi Bridge～Johoku Bridge

Rather bad smell
A little smell

1st/3rd/5thStage

7th/9th Stage

164

47

Bad smell
Smell
Not smell

90%
29
80%

41

70%
60%

21％ 29
Increased

50%
38

40%

21

30%
20%
13

14

8

7

1st/3rd/5th
Stage
39

7th/9th Stage

10%
0%

TRWKR

Johoku Bridge～Sanage Bridge

Rather bad smell
A little smell

100%

The numberof Survey data

Sanage Bridge

Johoku Bridge

After TRWKR, the rate of the occurrence of smell wasincreased between Sanage Bridge and Oseko Bridge.

The occurrence of bubbles _Constitution ratio(%)

Minatoshin Bridge～Oseko Bridge

Matsushige Bridge

The occurrence of bubbles _Constitution ratio(%)

Comparison during and after TRWKR(1st/3rd/5th Stage and 7th/9th Stage)
Minatoshin Bridge Ohseko Bridge

14

Bad smell
Smell
Not smell
The occurrence of bubbles _Constitution ratio(%)

The occurrence of smell・・・Spring～Early Summer

Rather bad smell
A little smell

100%
90%
80%
49

48

33

32

9

11

9

7

1st/3rd/5thStage

7th/9th Stage

105

44

70%
60%
50%
40%
30%
20%
10%
0%

The numberof Survey data

2

The rate of “bad smell～smell” is high.

The rate of “bad smell～smell” increased notably, “between Johoku Bridge and Asahi Bridge” and“between Matsushige Bridge and Oseko Bridge”.
■How did the smell change after TRWKR （spring～early summer)?
→The rate of “bad smell～smell” increased between Sanage Bridge andOseko Bridge, after TRWKR. It has been confirmed that the smell
had been improved by TRWKR. The area that tha rate of “bad smell～smell” increased notably, “between Johoku Bridge and Asahi Bridge”
and “between Matsushige Bridge and Oseko Bridge”.

■ How about smell ?
(spring～early summer)

57→The rate of “bad smell～smell” is high between Johoku
Bridge and Oseko Bridge.

2nd・4th・6th Stage： TRWKRNo rain in the day and the previous day
8th・10th Stage： TRWKRNo rain in the day and the previous day

Comparison during and after TRWKR(2nd/4th/6th Stage and 8th/10th Stage)
Minatoshin Bridge Ohseko Bridge

Matsushige Bridge

Asahi Bridge

Meijo Water
Treatment Center

After the TRWKR, the rate of the occurrence of smell was increased “between Sanage
Confluence of Shin‐Horikawa River Bridge and Johoku Bridge” and “between Matsushige Bridge and Oseko Bridge”.

Rather bad smell
A little smell

90%
80%
70%
80

60%
50%
40%
30%
20%
10%

20

No data0%
2nd/4th/6thStage

8th/10th
Stage

5

0

The numberof Survey data

Not enough data

90%
80%
70%

64

63

60%
50%

30%

15％
Increased14

20%

28

40%

10%
0%

4
4

2nd/4th/6th
Stage
The number
69
of Survey data

5
7
11
8th/10thStage
56

Bad smell
Smell
Not smell
100%
90%
80%

42
53

70%
60%
50%
40%

39
37

30%
20%
10%
0%

The numberof Survey data

Asahi Bridge～Johoku Bridge
Bad smell
Smell
Not smell

Rather bad smell
A little smell

11
11
3

7

2nd/4th/6thStage

8th/10th
Stage

151

68

7

The occurrence of bubbles _Constitution ratio(%)

Bad smell
Smell
Not smell
100%

100%

Matsushige Bridge～Asahi Bridge

Oseko Bridge～Matsushige Bridge

Rather bad smell
A little smell

The occurrence of bubbles _Constitution ratio(%)

The occurrence of bubbles _Constitution ratio(%)

Bad smell
Smell
Not smell

The occurrence of bubbles _Constitution ratio(%)

Minatoshin Bridge～Oseko Bridge

48

47

70%
60%
50%
40%
37

41

20%
10%
0%

Bad smell
Smell
Not smell

Rather bad smell
A little smell

100%

90%

30%

TRWKR

Johoku Bridge～Sanage Bridge

Rather bad smell
A little smell

100%

80%

Sanage Bridge

Johoku Bridge

74
4

2nd/4th/6th
Stage
The number
27
of Survey data

6
6
8th/10thStage
17

The occurrence of bubbles _Constitution ratio(%)

The occurrence of smell・・・Autumn～Early Winter

90%
80%
56

70%

69

60%
50%
40%
30%

31

20%

27

10%
0%

10
3

3

1
2nd/4th/6thStage

8th/10th
Stage

75

39

The numberof Survey data

The rate of “bad smell～smell” is high.
The rate of “bad smell～smell” increased notably, “between Matsushige Bridge and Oseko Bridge”.
■ How did the smell change after TRWKR （autumn～early winter)?
→The rate of “bad smell～smell” was increased ,between Sanage Bridge
and Johoku Bridge, Matsushige Bridge and Oseko Bridge, after TRWKR. It
was confirmed that the smell had been improved by TRWKR. The area, that“bad smell～smell” had been notably increased after TRWKR, wasbetween Matsushige Bridge and Oseko Bridge.

■How about the smell(fall～early winter)？
→The rate of “bad smell～smell” is high between Asahi
Bridge and Oseko Bridge.

58

７． Garbage

Average number of the garbage per investigation(The number/Investigation)

・Suspended Substance・Change in the number of suspended
substance(artificial garbage)■What’s the artificial garbage？
Plastic(such as shopping bag, plastic bag, cup noodles container,
Styrofoam, PET bottles), Can, Bottle, Cigarette(packing, cigarette butt)

53

7th～9th Stage：

TRWKR
No rain in the day and the previous day
TRWKR
No rain in the day and the previous day

All area

The sum of each stage, the numberof garbage per investigation4

1st～6th Stage：

Many plastic garbage was found
3.0
2.1 2.2

2

1st Stage
3rd Stage
Times of investigation 5th Stage
1st Stage：145
7th Stage
2nd Stage：255
9th Stagerd
3 Stage：191

2nd Stage
4th Stage
6th Stage
8th Stage
10th Stage

4th Stage：54
5th Stage：119
6th Stage：66
7th Stage：90
8th Stage：75
9th Stage：81
10th Stage：122

1.0

1

0.4

0
Total

Plastic

0.7
0.2

0.1

0

0.3

Can
BottlePaper
The kind of artificial garbage

0.1 0

Cigarette

注）Amount of garbage per survey＝ The number of garbage that was confirmed on the type of artificial/The number of survey＊The number of artificial garbage is the number that was confirmed on the survey.
About what has been reported “many(= ***)”, was calculated by substituting
the maximum number of 10 reported number of artificial garbage.

■What kind of garbage did wefind in suspended substance?
→We found many plastic garbage.

65

From 1st to 6th stage : TRWKRNo rain on the day and the previous day
From 7th to 10th stage：No TRWKRNo rain on the day and the previous day

Garbage on the road
Change of frequency that artificial garbage were found■What is artificial garbage？：Plastics(shopping bag、vinyl bag、noodle cap、Pofoam tray、PET bottle、shopping bag with garbage)、can、bottle、
cigarette(wrapping、tray)

26.0

2nd stage・All section
3rd stage・All section
4th stage・All section
5th stage・All section
6th stage・All section
7th stage・All section
8th stage・All section
9th stage・All section
10th stage・All section

These numbers mean how often we
found garbage in 10 times researches.
Ex) 1.8 means we found the garbage
18 times in 100 researches.

Garbage seems
to be decreasing

cigarette butt

cigarette wrapping

other papers

mamgazine

newspaper

paper bag

paper cartoncanspecified plastic bag
containing garbage

plastic bag containing garbage

pet bottles

other plastics

0.2

3.6 2.9
1.5
1.5
2.2
0.5
2.5
0.4
1.8
1.0
0.4
2.0
1.8 1.0
0.9
0.9 0.5 0.4
0.7
0.7
0.3
0.4
0.2
0.2
0.1
0.1
0.0

styrene foam tray

1.0

Noodle cup

1.1
0.1 0.0

Other vinyl

Sum of thesenumbers

Plastic bag

2.4
1.8
1.0
0.9

bottles

10.9

Plastic shopping bags

28
26
24
22
20
18
16
14
12
10
8
6
4
2
0

Total

Frequency(times/10 times researches)（2nd-10th stage,All sections）

Cf）Frequency(times/10 times researches)＝ how many times did we find garbage in 10 times researches＊This number doesn’t mean the amount of garbage.
We counted on how many times did we find garbage.

■How often does we find garbage around Horikawa river？
Garbage seems to be decreasing. Change of social environment such as charging for plastic
shopping bags and vibrant Cleaning activity may affect. It is cigarette butt that we found most often
in the research.

69

Living things around Horikawa river
Japanese trout①Fish(in the water) The width of river
Narrow

Japanese trouts are caught Motoiri Sluiceway
on Nov 16th ,2009.
～Sanage Bridge
By Mr. Umemoto(Krokawa Dream Party)
Sanage Bridge
By Mr. Wada
～Johoku Bridge(NPO Environment citizens)

pale chubJapanese trought, stone
moroko, etc.

Salinity
intrusion

Stone moroko and Johoku Bridge
rhinogobius～Asahi Bridge

Carp,gibel,Cat fish,
Mosquitofish,
Largemouth bass,
Northern snakehead,etc.

Asahi Bridge～
Matsushige pumping station
Matsushige pumping station～Kameya Bridge

Cat fishCarp

Mullet,dotted gizzard shad,Kameya Bridge～the mouth of Perch, Goby, etc.
Horikawa river

Introduced species

largemouth bass

A tidemosquitofish

Wide

Mullets are going upstream

northern snakehead

Brackish water species

Yellowfin gobyperchmullet72

②Crabs and Shrimps（at the waterside,in the water）
Japanese mitten crab and prawn caught
between Motoiri Sluiceway and Sanage Bridge

ShrimpMotoiri Sluiceway～Sanage Bridge

The width of river
narrow

Shrimps, etc.

Sanage Bridge
Report：Goyousui～Johoku Bridge
ato-gaien-aigokai
Survey Group
Johoku Bridge～Asahi Bridge

A tideSalinity
Intrusion

Red swamp
cray fish
Japanese mitten crab

Red swamp cray fish
（introduced species）
At nayabashi bridge

Asahi Bridge～
Matsushige pumping station

Matsushige pumping station～Kameya Bridge

Black grapsoid
crab

Kameya Bridge～The mouth of river

Japanese mitten crab
（Wandering species）

Wide

Black grapsoid crab

At nishikibashi bridge
Japanese grapsoid crab
around drain pipe

75

・We foundwandering Japanese mitten crabs.
shrimps between Motoiri Sluiceway and Sanage Bridge.
black grapsoid crabs between Asahi Bridge and the estuary.

Bird（water’s edge）

Width of river
narrow

Motoiri Sluiceway～
Sanage Bridge

tide

Little Egret
Night HeronGreat Egret
Heron

Sanage Bridge～
Johoku Bridge
Johoku Bridge～
Asahi Bridge

Little Egret

Salinity
Intrusion

Night Heron

Heron

Great Egret

Asahi Bridge～Shigematsu
Pumping Station
Shigematsu Pumping Station～Binya Bridge

Spot-billed Duck(resident bird)

Kameya Bridge～Estuary

During the winterducks are spottedin Horikawa river.
They migrate fronthe continent to
Horikawa river towinter. They goback to thecontinent when
winter is over.

wide

Aythya Ferina(winter bird)

Width of river
narrow

Motoiri Sluiceway～
Sanage Bridge
Sanage Bridge～Johoku
BridgeJohoku Bridge～Asahi
BridgeAsahi Bridge～Shigematsu
Pumping Station
Shigematsu Pumping Station～Binya Bridge

Green-winged Teal
(winter bird)

tide
Salinity
Intrusion

Spot-billed Duck
Green-winged Duck
Mallard Duck
Pintail
Aythya Ferina
Tufted Duck
Little Grebe group

Pintail(winter bird)
Commom Moorhen

Mallard Duck(winter bird)

Commom Moorhen group

Tufted Duck
(Winter bird)

Kameya Bridge～Estuary
wide

78

Birds（on the Water’s edge）
Wide of river
Narrow

Motoiri Sliceway～
Sanage Bridge

Cormorant

Tide

Sanage Bridge～
Johoku Bridge

Black-headed Gul

Horikawa river seems to be apath of the birds.

Johoku Bridge～
Asahi Bridge
Asahi Bridge～MatsusigePumpingSt
MatsusigePumpingSt～Beniya Bridge
Kameya Bridge～Estuary

Plover＆Ｓnipe

Salinity
Intrusion

Plover＆Ｓnipe

You can see birds eating theberries and insects in thewaterside trees.

Black-headed Gul

Cormorant
Black-headedGul

The line of trees along thewater’s edge is necesarryfor them.

Wide

Birds（on the trees）
Motoiri Sliceway～
Sanage Bridge
Sanage Bridge～
Johoku Bridge
Johoku Bridge～
Asahi Bridge
Asahi Bridge～MatsusigePumpingSt
MatsusigePumpingSt～Beniya Bridge

Wide of river
Narrow

turtlebove
Bove
BulbulStarling
Great tit
White-eyeBush warbler
Crow
Sparrow

Tide
Salinity
Intrusion

Ｔurtlebove

Ｓtarling

ＴhrushＷｏｏｄｐｅｃｋｅｒ

DaurianRedstar

Woodpecker
Thrush etc

Kameya Bridge～Estuary
Wide79Direction of windWind for upstream
上流向き 22%
80
60
40
20
0

7%

風無し

横から

54%

9%

Wind from ｓｉｄｅ

100

100
80
60
40
20
0

80
60
40
20

風無し

45%

横から

31%

30%
13%

下流向き14%17%

第1～10ステージ
調査数110

下流向き

小塩橋

錦橋

尾頭橋

上流向き 31%
上流向き
10%

横から

風無し

0

第1～10ステージ
調査数44

第1～10ステージ
調査数41
下流向き

上流向き 26%

上流向き 32%

100

横から

城北橋

北清水橋

夫婦橋

100
80
60
40
20
0

上流向き 10%

100

100

80

80
60

60

40

40

20

20

19%

風無し

横から

35%

11%

10%

第1～10ステージ
調査数59

下流向き36%

風無し

0

第1～10ステージ
調査数176下流向き 48%

横から

風無し

0

28%

3%

下流向き

59%

第1～10ステージ
調査数99

Wind for downstream

There are many directions ofwinds along Horikawa river.

■How about the direction of wind?
We were organized it using all dates on
the 10th stage from first stage.
It seem that there are more winds along
Horikawa river than crossing it.
About 80% of wind blows along
Horikawa river around Nishiki Bridge.

82

１０．Citizen Awareness & Learning Meeting ect
2011/09/10
9th Horikawa Sen-nin Chosatai
Reported by secretariat

Kurokawa Observation”Horikawa OyakoHureai Kansatukai”
Sponsored by Kurokawa Dream Party
Reported by Goyousui-ato-gaien-aigokai
Survey Group

Horikawa Urban Development
council
Executive committee
Nigiwai ｇｒoup
Reported secretariat

Horikawa Urban Development
council
Executive committee
Reported secretariat

Horikawa biodiversity
measures meeting
Reported secretariat

2011/12/16 by News paper

83Progress of Citizen’s Awareness –Study Meetings–「Nationwide Water City Forum in Osaka」
Host： Chamber of Commerce and Industry of Osaka
Planning for Waterfront Promotion Committee
Report : secretariat

Horikawa River Cruise Experience
Marunouchi junior high school
Host ： Nagoya Host Lions Club
Guide: Nagoya Horikawa Lions ClubOn board
Host：Horikawa Sen-nin Chosatai
report：Secretariant
Cooperation：Nagoya Horikawa Lions Club
City of Nagoya (Housing and City Planning Bureau)
Nagoya Port Authority

84

Progress of citizen’s awarenessThe 4th internet forum of which the Kiso River connecting mountains andtowns
Host: the executive committee of which the Kiso River connecting
mountains and towns, the executive committee of HSC
Sponsors: the middle area development bureau of MLIT, Nagoya City, theKiso extended association, the Okuwa Village, the Nagoya Urban InstituteThe symposium of which application of the
Horikawa River
Host: the executive committee of HSC, theexecutive committee of the Horikawa River watermagic festival, the Nagoya Urban Institute85

Progress of citizen’s awareness activity of study, cleaning etc.

Fixed point observation
The earth club survey
group

Cleaning event of Horikawa River
Host: Clean Horikawa
Report: Goyousui-ato-gaien-aigokai Survey Group,
the activation association of the Hirokoji central area,
the executive committee of HSC

The cleaning activity of the
Miya-no-watasi, Horikawabank protection
Activity, report: the NPO
Horikawa Town net

Cleaning activity and fixed point observation by
Nakanihon Engineering Consultants,
Kawasemi-Karugamo-Kamome group

Cleaning activity of Goyousui-ato-gaien-aigokai
Survey Group, children of the Iida elementary school
Report: Goyousui-ato-gaien-aigokai Survey Group86

Progress of citizen’s awareness activity of study, cleaning etc.

Planting of tulip
Cooperation: life support canter
Nanairo, children of neighborhood
Report: Goyousui-ato-gaienaigokai Survey Group

Display of 8year study of the Horikawa River “getting familiar with the
Horikawa River, record of 8year”
Kojo, Horikawa River and lifestyle thinking group
Report: executive committee of HSC

Panel display “trace the history of Horikawa River
Water-magic festival”
Host: executive committee of the Horikawa Watermagic festival
Display: the Horikawa River gallery
Report: executive committee of HSC

Environmental patrole
Lead: Shonai River Office of MLIT
Participate & report: Kojo, Horikawa Riverand lifestyle thinking group

87

Progress of citizen’s awareness activity of study, cleaning etc.

The Kankury clarification
experimentation
Ena agricultural high school,
Horikawa lions club
Report of Kankury clarification
Report: executive committee
experimentation
Report: Mr. Morimoto teacher of
Ena agricultural high school

From the Chunichi paper Oct. 7th 2011

Activity aid by the Uny co. & the Kao co.
Grateful letter from Mr. Umemoto, Chief ofexecutive committee
Report: executive committee of HSC

Living things, seen in the Kankury
clarification experimentation
Report: Kawasemi survey groop

Cleaning activity of the Horikawa riverHorikawa EM club
Report: Goyousui-ato-gaien-aigokai
Survey Group88

Progress of Citizen’s Awareness- Activities of “Free Survey Groups” and “Cheering Groups” -Awarded the prize of the water and soil preservation
activities by Director General of Environmental
Management Bureau, Environment Ministry of Japan
Report：secretariat

Picture-Story Show 「Hikosaku ,who constructed the
Nayabashi Bridge」
Produced by “The party for passing on the culture of
Horikawa”「The upstream respects for the downstream, while thedownsteam thanks the upstream」
Activity Report by the group “Kiso River Basin Min-Min no
Kai for protecting river source area”
Yominuri Newspaper
Morning Edition : Dec. 24 2011

Chunichi Newspaper
Morning Edition :Jan.24 201289

Progress of Citizen’s Awareness - Events -Chunichi Newspaper
Morning Edition :Sep. 14 2011

Chunichi Newspaper
Morning Edition :Oct. 7 2011
The 9th Horikawa Water Magic Festival
Host：Exective Committee of Horikawa Water Magic Festival
Paritcipation(booth)：Kojo-kai for the life with Horikawa
Report：secretariat

Chunichi Newspaper
Morning Edition :Sep. 24 2011

Environment Day Nagoya 2011 in which HSC run the booth
Report：secretariat

90

Progress of Citizen’s Awareness –Events–

Chunichi Newspaper
Morning, Oct. 24th. 2011

Chunichi Newspaper
Morning, Oct. 10th. 2011
Nakagawa Canal Water Festival
Dragon Boat Race Competition
Host： Nakagawa Canal Water Festival Executive Committee
Cooperation: Japan Dragon Boat Association

Shichirinowatashi Cruise
NPO「Society for Preservation of
Gondola and Horikawa waterfront」
Cooperation: Nagoya Horikawa Lions Club

「Horikawa Sweets」
Nagoya Youth Chamber(JC)Report: Secretariant「 Language Exhibition of 2011 Citizens」
Host：Kotodama Neon Project
Report: Secretariant91