Horikawa Sen-nin Chosatai 2010th

Summary meeting for the 17 stage

The ｓecretariat of Horikawa Sen-nin Chosatai 2010
Sep.5th.2015

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

Table contents
1．Surammary of Horikawa Sen-nin chosatai ・・・・・・・・・・・・・・ 3
２．Number of paticipants ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 7
３．Number of reports ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 9
４．Weather condition ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 11
５．Mainly water improvement facilities of implementation status ・・・13
６．17th stage survey’s report ・・・・・・・・・・・・・・・・・・・・・・・・・ 16
６.１. Introduction ～Colum～ ・・・・・・・・・・・・・・・・・・・・・・・・ 16
６.２. Clearness ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 19
６.３. Transparency ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 31
６.４. COD ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 39
６.５. Bubble ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 47
６.６. Smell ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 53
６.７. Color ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 59
６.８. Garbage ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 65
６.９. Living things ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 71
６.１０. Wind ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 74
６.１１. Conditions of Shin-Horikawa ・・・・・・・・・・・・・・・・・・・・ 75
６.１２. All together in spring （April. 20 2015） ・・・・・
79
６.１３. Clarification experiment of Horikawa for covered sand 95
６.１４. Citizen’s awarness ・・・・・・・・・・・・・・・・・・・・・・・・・・・ 103

2

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 excellence３

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 TRWKR

Horikawa Sen-nin Chosatai
April 2007～March 2012

① 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.

■ Fixed Point Observation Groups
Surveying effects of TRWKR■ Free Survey Groups
Researching Horikawa River by free themes■ Horikawa Cheering Groups
Cheering clarification of Horikawa

We improve our plan and take action
against the pollution. After that, citizens
and public administration do what is
possible to clean the river.

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 wasdeveloped② There are many things that citizens cando. We expand our partners who love
Horikawa River and hope TRWKR again.
We deepen exchanges with people livingin the basin of Kiso, Nagara, and Ibi River.
We check the effects of pollution removalfrom domestic wastewater and implement
it in each house.

４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?

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

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

５
Photo: Goyosui-ato-gaien-aigokai Survey GroupWater Environment of Horikawa River
Area of basin ：51.9km2
Length ：16.2km
Kiso River is our water source.

Change in temperature, precipitation and length of sunlight
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

６Investigation 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

5ｔｈ Sep.2015

Fixed Point
Observation
Groups55 groups
497persons

96 groups
984persons

Free Survey
Groups22ｇroups
234persons

40 groups
650persons

Horikawa
Cheering
Groups88ｇroups
1,531persons

2,562 groups
51,589persons

Total

165ｇroups
2,262persons

2,698 groups
53,223persons

７

Number of Participants ofHorikawa Sen-nin Chosatai

September 15th .2015

８

Survey Period and Number of Reports
Survey Period

With TRWKR

Introduceds
shallow
groundwater

Introduction od advanced watertraetment st the Meijo Water
Treatment Center
In-service of Horikawa
Ugan Rain -Water Reservoir
for pollution control

Utilizaion of reclamed
wastwater from Moriyama
Water Treatment Centerfrom Apr.to Oct

Covered
sand

Total

１st Stage
Interval
２ｎｄ Stage
Interval
３ｒｄ Stage
Interval
４ｔｈ Stage
Interval
５ｔｈ Stage
Interval
６ｔｈ Stage
Interval
７ｔｈ Stage
Interval
８ｔｈ Stage
Interval
９ｔｈ Stage
Interval
１０ｔｈ Stage
Interval
１１ｔｈ Stage
Interval
１２ｔｈ Stage
Interval
１３ｔｈ Stage
Interval
１４ｔｈ Stage
Interval
１５ｔｈ Stage
Interval
１６ｔｈ Stage
Interval
１７ｔｈ Stage

Spring～Early summer/Apr.22nd ～ Jun.30th.2007
Jul.1st ～ Sep.7th.2007
Autumn ～ Early Winter /Sep.8th～Dec.16th 2007
Dec.17th ～ Mar.31st.2008
Spring～Early summer/Apr.1st ～ Jun.30th.2008
Jul.1st ～ Sep.27th.2008
Autumn ～ Early Winter /Sep.28th～Dec.16th 2009
Dec.17th.2008 ～ Mar.31st.2009
Spring～Early summer/Apr.1st ～ Jun.30th.2009
Jul.1st ～ Sep.27th.2009
Autumn ～ Early Winter /Sep.27th～Dec.16th 2009
Dec.17th.2009 ～ Mar.31st.2010
Spring～Early summer/Apr.1st ～ Jun.30th.2009
Jul.1st ～ Sep.11th.2007
Autumn ～ Early Winter /Sep.12th～Dec.17th 2010
Dec.18th.2010 ～ Mar.31st.2011
Spring～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
Spring～Early summer/Apr.1st ～ Jun.30th.2012
Jul.1st ～ Sep.21th.2012
Autumn ～ Early Winter /Sep.22th～Dec.16th 2012
Dec.17th.2011 ～ Mar.31st.2013
Spring～Early summer/Apr.1st ～ Jun.30th.2013
Jul.1st ～ Sep.28th.2013
Autumn ～ Early Winter /Sep.29th～Dec.17th 2013
Dec.18th. ～ Mar.31st.2014
Spring～Early summer/Apr.1st ～ Jun.30th.2013
Jul.1st ～ Sep.7th.2014
Autumn ～ Early Winter /Sep.28th～Dec.16th 2014
Dec.1st. 2014～ Sep.7th..2015
Spring～Early summer/Apr.1st ～ Jun.30th.2015

Number ofReports
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
91
99
107
113
3,923

９

Number of Reports

The total number of reports about survey is 3,923 by the end of the17th stage.
On average, it is 400 every year.
A lot of citizens survey the real state of water environment of Horikawa River continuallyfrom a viewpoint and sense of citizens.

１０

４．Weather Condition
average value (Nagoya Local Meteorological Agency)
http://www.jma.go.jp/jma/menu/report.html

Temperature
4月～6月の平年値(1981年～2010年)
平均18.7℃

11

資料：気象庁_気象統計情報 名古屋地方気象台
http://www.jma.go.jp/jma/menu/report.html

4.Weather Condition
Precipitation

Length sunlight12

６．Report of 17th stage survey
Column “To clarify and restore Horikawa River”
Horikawa Sen-nin Chosatai 2010, which is composed of Fixed Point Observation Groups, Free Survey Groups andHorikawa Cheering Groups, made a start as a place for citizens’ activities to clarify and restore Horikawa River on
April 22nd, 2007.
Fixed point Observation Groups survey clarification effect of Horikawa by Transmission of Raw Water from the Kiso
River (TRWKR) with a view point and sense of citizens. Free Survey Groups research Horikawa on free theme.
Horikawa Cheering Groups support clarification and restoration of Horikawa. These groups are cooperating eachother in the big network for clarification and restoration of Horikawa.
There are 96 Fixed Point Observation Groups, 40 Free Survey Groups and 2,562 Horikawa Cheering Groups, thetotal is 2,698 groups and 53,223 persons as of Feb.15, 2014.
Compared with the number of groups and participants, 165 groups and 2,262 persons, at the start, network ofpeople who wish clarification and restoration of Horikawa has developed.

Fixed Point Observation Groups have made surveys at 3,923 times from 1st stage to 17th stage.
Those surveys show that the situation in the area of the downstream from Sanage Bridge variously changes as thetide rises and falls from hour to hour in Horikawa basin.
We learned that various surveys at various time, place and tidal situation enable us to understand average andchange of water quality in Horikawa.
And it was confirmed that water quality was improved roughly between Sanage Bridge and Matsushige Bridge forfive years of pilot project.
It was also confirmed that artificial garbage was reduced during this period.
So it is supposed that citizens’ awareness has changed for example cleaning activities are held more.
～Pilot project for clarification of Horikawa“Clarification effect by TRWKR from April 2007 to March 2012 was confirmed”～【Summary】■Clarification effect by TRWKR was confirmed between Sanage Bridge and Matsushige Bridge■Network of citizens who make a wish for clarification and restoration of Horikawa has grown■Awareness of clarification of Horikawa advanced

16

１．Weather and its influence on Horikawa River at 17th stage(from April to June in 2015)
There were many rainy days in the beginning and middle of April, and many sunny days in the end of April and in
May. The rainy season started on June 8th, in an average year. In this period, the temperature was a little higher,
the precipitation was less and hours of sunshine was shorter than usual.
Shorter hours of sunshine remarkably influenced on water color in the downstream from Sanage Bridge, which
is tidal section. The color like brown made by the red tide decreased. We think that’s because the plankton didn’t
increase very much because of short hours of sunshine.

２．Change of water quality from Spring to Early Summer(1st・3rd・5th・7th・9th・11th・
13th・15th・17th stage)①Change year by year
After the stop of TRWKR in March in2010, Advanced Water Treatment was introduced at Meijo Water
Treatment Center in May and Horikawa Ugan Rain-Water Reservoir for Pollution Control was in service in
September in 2010. And reclaimed waste water by membrane filtration started to be injected from Meijo Water
Treatment Center into Horikawa in August in 2011. The amount of the injected water is max 4,000m3/day (0.046
ｍ3/second). The water is injected into Shonai Irrigation Canal from November to March, non-irrigation season,and into Horikawa from April to October. Shallow ground water also has been injected as a new water resource inthe upstream area. A well was dug in the upstream area of Shiga Bridge in March and the ground water started
to be injected into Horikawa by 0.01m3/s. In addition, new clarification experiment by sand capping started
between Naka Bridge and Gojo Bridge in February.
The water quality of Horikawa got worse in the 7th stage from April to June in 2010, just after TRWKR. But
after 7th stage, the water quality has been tend to be improved or kept in the limited section. We think that thewater quality has get better by the new measures for water quality improvement.

②Change in a year
We analyzed 1971 survey data collected from April in 2010 to March in 2015 to understand the change of thewater quality by month. The analyzation proved following.
〇“Impression of clearness”, “transparency” and “ＣＯＤ” get worse from Spring to Autumn (from April to
September). 〇“Impression of clearness” was worse especially in the high tide in August when “impression ofclearness” was evaluated more by smell than other months. 〇When “bubbles from the bottom” is observed,“Smell” gets worse （the ratio of “Terrible smell”～“Smell” is 44%).
We have guessed that it’s difficult to evaluate “Smell” quantitatively because there are differences amongindividuals to distinguish kinds or strength of “Smell” . But many data collected by survey groups enable us tounderstand citizen’s average sense when they evaluate Horikawa.

17

3．General Survey on High Tide in Spring in April 20 th ,2015（1）Weather
We had 25.5 mm of rain from 11:00 to 15:00 because of a low pressure with a front om that day and thetemperature got high because warm and humid air blew to the front.

（2）Inflow into Horikawa”Light yellow gray” colored fresh water was flowing in from Nakagawa Canal. It affected the water color in
downstream near Sanno Bridge. “Gray green” colored muddy water was flowing from sewer outlet from 12:00 ～13:00 when it rained heavily.

（3）Changes in Horikawa①Blue Tide and Red Tide flow backward to the middle stream area

Flowing backward of milky water and the red tide were not observed. It might be because “the plankton can’t
increase easily because of short hours of sunshine“ and “good quality rain water flowed into Horikawa caused by along rain” in the beginning and middle of April. On the other hand, milky-like light yellow gray was observed at
Horagai Bridge in the upstream of Shin-Horikawa.

②Sludge was raised up

Sludge was raised up a lot between Naya Bridge and Gojo Bridge at the low tide nearly on the ebb tide. The watercolor was “dark gray” and it was raised up heavier near the bank than in the center of river.

③Bubbles from the bottom

Bubbles from the bottom was not found.

④Floating things were gathered at the tip of the tide
Floating things were gathered near Naka Bridge at the high tide but the quantity of those is not many.
Floating things flowing downstream were gathered in the pool near Naya Bridge at the low tide and those moved tothe upstream from the pool at the high tide. Those seem to flow to downstream and upstream over and overbetween the pool in the downstream and the tip of the tide in the upstream.

■Clarification Experiment by Covering Sand started in February①Fixed Point Observation
We arranged changes surveyed in the experiment section and also upstream and downstream to the experimentsection. That shows that “impression of water clearness” mainly is tend to be improved. We need to continue
survey.

②Living Things

The capping sand appeared on the water at the ebb tide of the high tide and birds which like the waterside stayed
there and was looking for foods. If a variety of living thing lives and breeds there, improvement of the selfpurification action of nature can be expected. We need to continue survey.

18

６.２. Impression of Clearness

Upstream Section

The 1st-6th Stage ： With TRWKRNo rain on the day and the previous day
The 7th-17th Stage： No TRWKR
The ratio of “Clean”, “Slightly clean” and “Ordinary” No rain on the day and the previous day

Not enough data.

With TRWKR（Between Sakae Bridge and Sanage Bridge Average）
Introduction of advanced water treatment at Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservoir for pollution control

25 out of 31 times surveys were carried out on June27th(at Kizune Bridge), and “Slightly dirty” was seen a lot.

Utilization of reclaimed wastewater at Moriyama Water Treatment Center

Between Sakae Bridge and Sanage Bridge Utilization of groundwater
100
100

100

100

100

100

100

87

100

100

100

87
75

80

Impression of Clearness（％）

100

93

60
60

40

50

Horikawa upstream section is mostly
in the acceptable range for citizens(The ratio of “Clean”, “Slightly clean” and “Ordinary”
is mostly 100%)39

20

4/1-6/30 2015

9/29-12/16 2014

4/1-6/30 20149/29-12/17 2013

8th st.
8

4/1-6/30 2013

7th st.
5

9/22-12/16 2012

6th st.
3

4/1-6/30 2012

9/11-12/17 2010

5th st.
8

9/11-12/16 2011

4/1-6/30 2010

4th st.
2

4/1-6/30 20119/27-12/16 2009

4/1-6/30 2008

1st st. 2nd st. 3rd st.
15
31
41

4/1-6/30 2009

Numberof data

9/28-12/16 2008

Not enough data.

9/8-12/16 2007

4/22-6/30 20070

9th st. 10th st. 11th st. 12th st. 13th st. 14th st. 15th st. 16th st. 17th st.
9
9
7
5
8
8
7
1
4

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

19

Impression of Clearness

The 1st-6th Stage ： With TRWKR

Middle andNo rain on the day and the previous day
The ratio of “Clean”, “Slightly clean” and “Ordinary” The 7th-17th Stage： No TRWKR
Downstream Section Except the data between Oseko Bridge and Minatoshin Bridge for not enough data No rain on the day and the previous day
With TRWKR（Between Sanage Bridge and Oseko Bridge_average）
Introduction of advanced water treatment at Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservoir for pollution control
Utilization of reclaimed wastewater at Moriyama Water Treatment Center

Between Sanage Bridge and Oseko Bridge

Impression of clearness has been Improved gradually.
59

60

45
40

20

43

42
29

43

29

Increasing occurrence of
bubbles and smell,
Going upstream of red tideand blue tide, Winding up ofsludge →Worsened 32
24

22

24

4/1-6/30 2013

No TRWKR
Worsened

9/22-12/16 2012

Impression of Clearness（％）

80

With TRWKR
Improved

4/1-6/30 2012

100

Utilization of groundwater

18

16

58

Improved
to 42％
42

31

9

4/1-6/30 2015

9/29-12/16 2014

4/1-6/30 2014

8th st.
67

9/29-12/17 2013

7th st.
85

9/11-12/16 2011

6th st.
63

4/1-6/30 2011

9/11-12/17 2010

4th st. 5th st.
52
111

4/1-6/30 2010

4/1-6/30 20099/28-12/16 2008

4/1-6/30 2008

1st st. 2nd st. 3rd st.
113
208
176

9/27-12/16 2009

Numberof data

9/8-12/16 2007

4/22-6/30 20070

9th st. 10th st. 11th st. 12th st. 13th st. 14th st. 15th st. 16th st. 17th st.
76
98
62
113
89
77
113
93
81

■How did the impression of water clearness 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 increased) during TRWKR. In the 7th stage after the stop of TRWKR,
Impression of water clearness was worsened. Moreover, in the 12th and 13th stage, it was worsened by increasing occurrence of bubbles and smell, going
upstream of red tide and blue tide, and winding up of sludge. However, impression of water clearness was improved after that. It is considered that thesetrends are made by the effect of new water quality improvement measures. The ratio of “Clean”, “Slightly clean” and “Ordinary” was 42% in the 17th stage.
＊“Clean”, “Slightly clean” and “Ordinary” are categorized as the acceptable range for citizens.

20

The 1st-6th Stage ： With TRWKRNo rain on the day and the previous day
The 7th-17th Stage： No TRWKRNo rain on the day and the previous day

２． Transparency
Change in Transparency

Upstream Section

With TRWKR （Between Sakae Bridge and Sanage Bridge Average）
Introduction of advanced water treatment at Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservoir for pollution control
Utilization of reclaimed wastewater at Moriyama Water Treatment Center
Utilization of groundwater
100
100

88

86

85

80

79

80

Transparency(cm)

63
60

57

64

62

59

55

71

67

71

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

55

42
40

20

4/1-6/30 2015

9/29-12/16 2014

4/1-6/30 20149/29-12/17 2013

8th st.
8

4/1-6/30 2013

7th st.
5

9/22-12/16 2012

6th st.
3

4/1-6/30 2012

9/11-12/17 2010

5th st.
8

9/11-12/16 2011

4/1-6/30 2010

4th st.
2

4/1-6/30 20119/27-12/16 2009

4/1-6/30 2008

2nd st. 3rd st.
13
41

4/1-6/30 2009

1st st.
3

9/28-12/16 2008

Numberof data

9/8-12/16 2007

4/22-6/30 20070

9th st. 10th st. 11th st. 12th st. 13th st. 14th st. 15th st. 16th st. 17th st.
9
9
7
1
5
7
8
7
4

Not enough data.

■ How did the transparency change in the upstream section (Sakae Bridge - Sanage Bridge) ?
→There are not enough data, but transparency after the 12th stage have been over 70cm
( citizen’s acceptable value ).

32

Middle andDownstream Section

The 1st-6th Stage ： With TRWKRNo rain on the day and the previous day
The 7th-17th Stage： No TRWKRNo rain on the day and the previous day

Change in Transparency（Between Sanage Bridge and Oseko Bridge_average）
With TRWKR

Introduction of advanced water treatment at 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

82

Improvedwith TRWKR

Transparency(cm)

60

83

72
61

60

57

Improved 84

early winter without TRWKR

76

80

Utilization of groundwater

Worsened
without TRWKR Keeping from autumn to
73*

72
59

60

59

58 *

56

52

73

Keeping or improved a little
from spring to early summer without TRWKR(changing below 70cm)

40

20

64

4/1-6/30 2015

9/29-12/16 2014

4/1-6/30 2014

8th st.

77

9/29-12/17 2013

7th st.

61

4/1-6/30 2013

6th st.

95

9/22-12/16 2012

9/11-12/17 2010

5th st.

36

4/1-6/30 2012

4/1-6/30 2010

4th st.

9/11-12/16 20119/27-12/16 2009

3rd st.

129

4/1-6/30 2011

4/1-6/30 2009

2nd st.

155

9/28-12/16 2008

1st st.

55

4/1-6/30 2008

Numberof data

9/8-12/16 2007

4/22-6/30 20070

9th st. 10th st. 11th st. 12th st. 13th st. 14th st. 15th st. 16th st. 17th st.

73

108

107

84

90

81

79

54

74

■How did the transparency change in the downstream section (Sanage Bridge - Oseko Bridge)?
It was improved during TRWKR and it was worsened without TRWKR. It was above 70cm, which is acceptable for citizens, andit was still improved in 16th stage. From spring to early summer, it was improved slightly or keeping after the stop of TRWKR.
But the readings were below 70cm.
＊In 12th and 13th stage, it was reported that blue tide or red tide flowed up and sludge rolled up, but it didn’t affect theresult clearly. The reason of it is probably that we scoop and observe fresh water on surface.

33

The 1st-6th Stage ： With TRWKRNo rain on the day and the previous day
The 7th-17th Stage： No TRWKRNo rain on the day and the previous day

Ｃａｎｇｅ ｏｆ ＣＯＤ

Upstream Section（Between Sakae Bridge and Sanage Bridge. Average）
With TRWKR

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

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

1

4

Not enough data

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

→Although COD was 7mg/L in the 7th stage, it is over 10mg/L more frequently after 8th stage.

40

The 1st-6th Stage ： With TRWKRNo rain on the day and the previous day
The 7th-17th Stage： No TRWKRNo rain on the day and the previous day

Ｃａｎｇｅ ｏｆ ＣＯＤ

Middle and downstream section（Between Sanage Bridge and Oseko Bridge, Average）

With TRWKR

Introduction of advanced water treatment at Meijo Water Treatment Center
In-service of Horikawa Ugan Rain-water Reservoir for pollution control
Utilization of reclaimed wastewater at Moriyama Water Treatment Center
Utilization of groundwaterslightly worsened
after the stop of TRWKR a little fluctuation or kept
after the stop of TRWKR

Improved or kept
with TRWKR

more worsened
more improved**

Going up of blue tide or
red tide rising of sludge

Numberof survey

115

182

152

76

101

87

84

63

75

112

109

85

92

82

84

61

74

■ 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, slightly worsened after the stop of TRWKR in the 8th stage, andwas fluctuated or kept around 10mg/L. Although COD was slightly worsened in the 15th stage, it was slightly improved
around 10mg/L in the 17th stage.
In the 12th and 13th stage, going up of blue tide or red tide rising of sludge was reported, but the effect of those didn’t
appear clearly because it supposed that we observed fresh water of a surface

41

Change of bubbles from the bottom
In the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, and 17th stage (spring-early summer)
At each bridge, No rain, Both with TRWKR and without TRWKR
Occurrence of bubbles component ratio(%)
Asahi Bridge＝Days when bubbles rise from the bottom／All survey days×100

Habashita Bridge

Suspended state substanceoccurs and settles and sludgeof bottom tends to deposit
because it is located at theend of ebb and high of the tide.

Kitashimizu Waterfront Park

Nishiki Bridge

Sludge of bottom tends todeposit because where theriver is wide is slow to flow.

Naya Bridge

Bubbles are frequently observed＊：Under 10 samples

Bubbles are frequently observed from spring to early summer between NayaBridge and Tenma Bridge, at Habashita Bridge and Kitashimizu Bridge.
At Kitashimizu Bridge, suspended substance is settled and sludge of bottom
tends to deposit because where the river is wide is slow to flow. Betweeen
Asahi Bridge and Naya Bridge, suspended state substance occurs and settles
and sludge of bottom tends to deposit because it is located at the end of ebb
and high of the tide.

50

Sorce：Report from the thirteenth survey meeting of HSC p.79

Review; Current Condition & Pollution Mechanism of Horikawa
Based on 3,083 surveys for 6.5 years by HSC

Bad impression of the water pollution between Johoku
Bridge and Matsushige Bridge

How do we evaluate impressionof the Water Pollution(13th stage)

Color of water 60%
Cleamess 18%
Litter 14%
Smell 7%

Floating Scum

Especially between Asahi Bridge and Matushige Bridge
・Many bubbles from the bottom
・Terrible smell

Bad impression of the water pollution
Many babbles from bottom
Around the Matsushige
pump station

Terrible smell
Many floating litter

Minatoshinbashi
BridgeNagoya▼high tide
port

Oseko
BridgeKameyaBridgeMany floating litter

Matsushige
BridgeAsahi
BridgeJohokuBridgeSanageBridgeShonai River
Motoiru Sluiceway▼low tide
Water level, stream direction ,flow rate
Changes by tide level.
Difference of tide level reaches 2m & overRising sludge

Sedimentationof sludge

Worsening of color,
Going up of blue
Deterioration of clearness
tide or red tide Deterioration
Deterioration of smell (Rotten Egg)of color,
Red tideBlue tideclearnessand smell

Deterioration of smell(sludge & ditch smell)
Worsening ofcolor, Deteriorationof clearness

Rising of sludge

Exposure of sludge
When tide is low at spring tide52

６.６. Smell

Kind of smell （each division）・・・spring～early summer
Introduction of Advanced treatment at Meijo Wastewater Treatment CenterWith TRWKR

1st,3rd,5th stage ： With TRWKRNo rain on the day and the previous day
7th,9th,11th,13th,15th,17th 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 Wastewater（April～October)）
Utilization of groundwaterWith TRWKR

Few data■Change of the smell, fromspring to early summer,
between Sanage bridge to
Minatoshin bridge

Ｎｏ ｄａｔａWith TRWKR

86%
82%

79%

88%

76%

86%

86%

81%

→The amount of ”Ditch” and“Sludge” was about 80%.
Each rate was about 40%.
There is no significant change
in 7th stage and 17th stage.

About 40%

No data

The rate of “Ditch”＋“Sludge” is about 80%

About 40%
* 0% item isn’t displayed.

Sample56

６.７. Colors
Ratio of color （Sanege bridge ～ Minatoshin bridge）⑤green⑦yellow gray

⑨gray yellow
green⑩gray green■Frequent colors?
⑨gray yellow green,
There was a⑧pale gray yellow green,andreport that
⑦yellow gray.
fishes wereCompared to 15th stage, thesuffering at “⑧ratio of ⑧pale gray yellow
pale gray yellow
green and brown color(⑬yellow brown,⑭brown, and ⑮⑧pale gray yellow green”
green brown） decreased, butgreen
the ratio of ⑩gray green and⑪dark gray increased.
Taken at Nishiki
bridgeIt seems that fewer colorationof plankton have decreased theratio of brown colors.
（Red tide did not occurred in17th stage）⑪dark gray60

Change of colors(from spring to early summer)

The 7th, 8th, 11th, 13th, 15th 17th stage:
without TRWKR ,no rain on the day and the previous day

Note: small number of survey datalegend■milky■red tide②milky white ⑬yellow brown⑧pale gray
⑭brownyellow green⑮green brown⑫pale yellow gray■sludge⑥gray⑩gray green⑪dark gray■ change of colors
In the 15th stage, the ratio ofmilky and red tide was high, andthe ratio of sludge was low. Thiswas because of blue tide(milkycolor) by higher temperature andlonger duration of sunshine thanusual.
In the 17th stage, compared to
the 15th , the ratio of milky andsludge increased, the ratio of red
tide decreased.
It seems that lower duration ofsunshine than 15th have affected
small amount of red tide(small
amount of plankton).

Note: 0% items omitted.

Ratio of Milky and red tide increased,
and that of sludge decreased.

61

Ｌｉｔｔｅｒｓ
Floating litters,
Change of the number of litters

1st-6th stage ： With TRWKRNo rain on the day and the previous day•7th-17th stage ： No TRWKRNo rain on the day and the previous day■Litters
Plastic wastes(PE shopping bag, plastic bag, noodle cup, polystyrene foam tray, petbottles, PE shopping bag with garbage), can, glass bottle, cigarette(wrapping, butt)
Number of research

The number of litters is 1.5
per one survey, at 17th stage
Plastic wastes is higt

1st stage：145
2nd stage：255
3rd stage：191
4th stage：54
5th stage：119
6th stage：66
7th stage：90
8th stage：75
9th stage：81
10th stage：122
11th stage：122
12th stage：106
13th stage：101
14th stage：89
15th stage：96
16th stage：64
17th stage：81

Cleaning
Ship
The sum of each stage
The number of littersper one survey

Note: the number of litters per one survey ＝ the number of each littersfound in all survey / the number of surveys＊the number of litters is the number of litters found in all survey
If the number of litters was reported “countless（=***）”in some survey, it
count ”10”, the maximum number of other reports.

■Floating litters→At 17th stage, the number of floating litters is 1.5 per one survey. Especially, the number ofplastic wastes is high, about 1.0 per one survey.

67

Upstream of Horikawa River

６.９. Living things

Report：Goyosui-ato-gaien-aigokai-chosatai

Going upstream of migration fish and brackish water■ Going upstream of Gobys fry
was confirmed.
○ Nishiki Bridge○ First confirmed day
April 22 2008
April 22 2009
April 25 2010
April 13 2011
April 18 2012
April 16 2013
April 23 2014
April 22 2015

■Going upstream of Mulletfry(total length was about 3cm)
was confirmed.
○ Nishiki Bridge○ First confirmed day
May 9 2007
Spawmomg of Carp
Yellow Soft-shelled Turtle at Shiga Bridge
March 22 2008
aroundtheMenotoBridge
April
24
2015
May 3 2009
May 25 2010
April 26 2011
April 27 2012
April 29 2013
May 21 2014
April 22 2015
Soft-shelled Turtle
around Chigomiya Bridge June 21 2015

Goby
Young fish of Mullet
Living things around Nishiki Bridge April 22 2015（Wed）
Photo : Kawasemi Chosatai

Mosquitofish（Alien species）
and Goby

Red swamp crawfish

Going upstream of the school of many young Mullet
Found between Nishiki Bridge and Naya Bridge
May 29 2015 (Fri.)
Report : Kawasemi-Chosatai

School of young fish of Mullet
Around the Sumiyoshi Bridge
May 27 2015(Wed）
Photo : Chikyukurabu-Chosatai

Colored carp of 60cm length
Around kurokawa 2nd Bridge
June 2 2015（Tue）

School of young fish of Mullet
Along the right bank from Atsutakinen
Bridge to Shiratori Bridge
June 5 2015（Fri）
Report : Kojo Horikawa-to-Seikatsuwo-Kangaerukai

Chiromantes dehaani

Japanese cormorantpreyed on mullet.

71平成27年5月3日
中川運河 コノシロ
約45万匹浮く

Nakatoko Bridge Living things Observation Diary
Report：Sato family Chosatai
April 9 2015（Thu）
April 1 2015（Wed）
It’s not visible figure of carp
It’s not visible figure of fish
because the river was impure. One new feces of a racoon dog was
Two new feces of a raccoon found.
dog was found.

We think that if many river fishes being to live, the river become rich ecosystem. So, we walk and observearound Nakatsuchido Bridge to notice, what we can do for the river to became rich ecosystem. We try to dothat 200 times in one year, and reduce a certain amount of reports except for the special topics.
June 7 2015（Sun）
Not found Carp, Japanese daceand feces of raccoon dog

May 9 2015 （Sat）
Young fish of Carp, Japanese dace
New feces of a raccoon dog

April 12 2015（Sun）
Tufted duck, Common teal,
Carp is found. Two new fecesof a raccoon dog was found.
One is new, another is old.

May 24 2015（Sun）
Young fish of Japanese dace
Old feces of a raccoon dog

April 23 2015（Thu）
Not found Common teal,
young fish of Japanese daceand feces of raccoon dog.
July 26 2015（Sun）
Not found Gray duck, Great Cormorant,
young fish of Japanese dace and feces of raccoon dog.

Raccoon dog at Nakatsuchido Bridge
January 27 2015

（data）16thmeeting p.80

73

6.11. State of Shin-horikawa River
Impression of water pollution

Shin-horikawa River

All data included

Maizuru Bridge

Impression of water pollution got worth between Uzura Bridge and Oi Bridge

Kinen Bridge

Uzura Bridge

Oi bridge
93％

100％

94％

72％

Horagai Bridge
Tateishi Bridge

63％

Hinode Bridge■ Impression of water pollution

Ukishima Atsuta Bridge
BridgeComponent ratio of “dirty” and “slightly dirty” got more than
70% at Uzura bridge and Oi bridge (upstream of Shinhorikawa). Especially that ratio was more than 90% at Uzura
Bridge and Oi Bridge. At Atsuta Bridge(downstream of Shinhorikawa), most answers are between “slightly dirty” and“slightly clean”.
Impression of water pollution is bad between Uzura Bridge
and Oi Bridge.

75

Transparency of Shin-horikawa River
Low transparency at Atsuta, Tateishi, Horagai and Oi Bridge
100
90
80

Transparancy(ｃｍ)

85

84

79

68

70

75

66
55

60

45

50
40
30

Transparency in upstreamof Shi-horikawa river, at
Maizuru Bridge and Kinen
Bridge, was more than
70cm.It was acceptable
range of citizen. But it
was only 45-68cm at
Atsuta, Tateishi, Horagai
and Oi Bridge.

20

10

no data0

numberof dataUkishima Atsuta Hinode Tateishi Horagai
1
1
1
8
28

Oi
30

Kinen
16

Uzura Maizuru
40＊acceptable range for citizen: 70cm & over transparency

COD of Shin-horikawa River
17～19mg/L between Horagai Biridge and Maizuru Bridge
20

18

18

ＣＯＤ(mg/L)

16
14

13

18

19

19

Oi

Kinen

Uzura

30

33

11

17

14
11

12

11

High COD level was seen between
Maizuru Bridge and Horagai
Bridge. Atsuta Bridge on
downstream of Shin-horikawa is
14mg/Ｌ. COD of upstream ishigher than that of downstream.

10
8
6
4
2
0

numberof dataUkishima Atsuta
1
29

Hinode Tateishi Horagai
181

Maizuru
876

Bubbles of Shin-horikawa River
Bubbles from river bottom were seen at
Maizuru, Uzura, Kinen and Oi Bridge.
Especially, the ratio of “bubbles from riverbottom” is 67% at Uzura Bridge.
No bubbles occur at other Bridges.

Many bubbles fromriver bottom wereseen at Uzura Bridge

numberof data

Smell of Shin-horikawa River

Terrible or bad smell occurred upstream,
between Maizuru Bridge and Horagai
Bridge. the ratio of “terrible smell” “badsmell” and “smell” is 26%-78% between
Maizuru Bridge and Horagai Bridge.
78％

Worth smell occurred between
Maizuru Bridge and Horagai Bridge
47％
36％

50％
26％

numberof data77

Kind of Smell from Shin-horikawa Riversmell ofsulfursmell of oil etc

Ditch, sludge and rotten egg smell
occurred on upstream between
Uzura Bridge and Oi Bridge.

Sludge and rotten egg
smell occurred at Uzura
Bridge, Kinen Bridge andOi bridge.

numberof data

26

6

13

32

7

Colors of Shin-horikawa
ColorlessLight gray yellow green
Yellow brown

Milk white
Gray yellow green
brown

Yellow green
Gray green
Green brown

100%

14
Component ratio ofcolors (%)

25

50%

100

17
25

103
3
3
0%
Ukishima Atsuta
number1
29
of data

6
9
9

24
47

25

13
100

100

Yellow grayLight yellow gray

13

7

3

24

10
10

13

20
3

Hinode Tateishi Horagai
1
1
8

10
7

11

43

56

17

Lighter colors were seenat Uzura Bridge and Kinen
Bridge
22

14

13

Oi
30

36

17
63
Kinen
35

Lighter colors were seen at Uzura
Bridge and Kinen Bridge. Colloidal
particulate sulfur might cause thesecolors.
And darker green colors seen at
Kinen Bridge, Oi Bridge, andHoragai Bridge were fromphytoplankton.

23
Uzura
30

11
Maizuru
978

６.12. Spring tide general survey in Spring（Apr. 20th ,2015）
Horikawa Sen-nin Chosatai 2010
5th Horikawa general survey～Spring tide general survey in Spring～surveyed when the change of the tide is high■ Survey day：Monday, April 20th ,2015
Changes in the tide level（Nagoya Port）：Tide level difference about 2.4ｍ
High tide 6:38
T.P.107cm

The difference oftide level at Nagoya
Port was about
2.4m(predictedvalue). Measured
value was a little
higher than thepredicted value.

High tide 19:22
T.P.109cm

Difference of tidal level

Difference of tidal level

243cm

245cm
Low tide13:00
T.P.-136cm

Source) Japan Meteorological Agency HP

79

■ Survey method■Survey item：Same item as other fixed point observation＊Record table use the ones of fixed-point observation■Survey photo：To record the state of the Horikawa River Photos～Point of survey～■Change of Color, Smell and Bubble①Run-up of blue tide and red tide
②Raised up of sludge on riverbed③Bubbles from river bottom■Other changes①State of creatures②State of floating litters at edge of tide80

～Spring tide general investigation in Spring～ （Apr. 20th ,2015）

Weather Overview （Nagoya）
Mid-early April unstable
weather continued, rainy
day is now many. On the
day of the survey, the lowpressure associated withthe front passes through,the rain of 25.5mm wasdown. In addition, warm
moist air toward the front
flows, temperature
became high.

Temperature riseRain was down to 11:00
to 15:00. Occasionally,
blew a strong wind of about
umbrella is broken. Since
that has flowed warm moist
air, the temperature has
increased.

Source) Japan Meteorological Agency HP

81

①Direction of water flow
Tidal Level at Nagoya Port（April 20th, 2015）

Falling tide

Rising tide

Source) Japan Meteorological Agency

Change in the direction of water flow（April 20th）↓：Downstream direction ↑：Upstream direction -：No flowRiver
Horikawa

Upstream

Downstream

ShinHorikawa

6:00
7:00
8:00
BridgeMeoto
Water flow had
Shiga
Kitashimizu been stagnant
Johokuat falling tide.
Nakatsuchido
Gojo
Naka
SakuraTemma
NishikiNaya
Tennozaki
Shinsuzaki
Suzaki
Iwai
Hioki
Matsushige
Sanno
Oto
Goryo
Shiratori
Oseko

Horagai

9:00

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

18:00

19:00

20:00

↓
↓
↓

Continued to flow downstream,in spite of the low tide.

↓

↓
↓
↓
↓
↓
↓
↓
↓
↓
↓

↓
↓
↓
↓

↓
↓
↓
↓
↓
↓
↓
↓

↓
↓
↑
↑

↑
↑

↓

Flow direction changed fromupstream to downstream,
before high tide.

↓
↓
↓
↓
-

Water flow had been stagnant at falling tide.

82

②Impression of water clearness
Tidal Level at Nagoya Port （April 20, 2015）

Falling tide
Rising tidereference: Japan Meteorological Agency
Hour

Change in water clearness impression （April 20, 2015）↓：flow downstream ↑：flow upstream -：no flow
1：dirty 2：slightly dirty 3：ordinary 4：slightly clean 5：clean

upstream

downstream

River
BridgeHorikawa Meoto
Shiga
Kitashimizu
JohokuNakatsuchido
Gojo
Naka
SakuraTemma
NishikiNaya
Tennozaki
Shinsuzaki
Suzaki
Iwai
Hioki
Matsushige
Sanno
Oto
Goryo
Shiratori
Oseko
ShinHoragai
Horikawa

6

7

8

9
3↓

10

11

12

Hour
13

14

15

16

17

1↓
3↓
1↓
1↓
1↓
1↓

“slightly
clean”or“clean”
in downstream
area from Oto
Bridge at falling
tide

2↓

19

20

“dirty” between Naya Bridge ～Naka Bridge around high tide.

22↓

2↓
2↓
2,3↓
2↓
2↓

18

1↓
1↓
1↓
1↓
1↓
1↓ 1↓
2↓ 1↓
2↓ 2↓
1↓

4↓

1↓
1↓ 1↓
1↑
2↑

1↑
1↑

1↓

“dirty” or “slightly dirty” between
Sannno Bridge～Johoku Bridge.
“dirty” between Hioki Bridge ～Gojo
Bridge at low tide

2↓
5↓
4↓
1－

“dirty”

83

Water clearness impression （April 20, 2015）
1：color 2：smell 3：transparency 4：litters

upstream

downstream

River
Bridge67894↓Horikawa Meoto
Shiga
Kitashimizu
Johoku2Nakatsuchido
3↓
Gojo
Highest ratio was
Naka“Color”
between
SakuraSanno
BridgeGojo
Temma
Bridgeatfallingtide.
NishikiNaya
Tennozaki
Highest ratio was
Shinsuzaki“Transparency”
Suzakibetween Oseko
Iwai
Bridge and Oto
Hioki
Matsushige Bridge (except for
Sanno
Shiratori Bridge)at
Oto
falling tide.
Goryo
Shiratori
Oseko
3↓
ShinHoragai
Horikawa

10

11

12

Hour
13

14

15

16

17

18

19

20

1↓
1↓
1↓
1↓
1↓
1↓
1↓
1↓
1↓
1↓
1↓
2↓

1↓
1↓
1↓
1↓
1↓
1↓ 1↓
1↓ 1↓
1↓ 1↓
1↓

4↓
4↓ 4↓
1↑
1↑

1↑
1↑

3↓
3↓

4↓

Highest ratio
was “Litters”
between NayaBridge and Naka
Bridge near high
tide.

1↓
1－

Highest ratio was “Color” .

■Evaluation of “Impression of water dirtiness”①Impression of water dirtiness between Sanno Bridge and Johoku Bridge was ”slightly dirty” or “dirty”, which were
evaluated mostly by “Color”. Especially, it was evaluated as “dirty” between Hioki Bridge and Gojo Bridge at falling tide,which were considered as the influence of whirling up sludge. On the other hand, it was evaluated as “slightly clean” or“Clean” at falling tide.
These results show that impression of water dirtiness is different by areas. Our future task is to analyze these states.
Impression of water dirtiness between Naya Bridge and Naka Bridge at high tide was ”slightly dirty” or “dirty”, which were
evaluated mostly by “Litters”. Floating objects gathered by tidal influence are considered as the cause.
②Impression of water dirtiness at Horagai Bridge of Shin-Horikawa River was “dirty”, which were evaluated mostly by“Color”. It was “pale yellow gray”, different from Horikawa (mainly “gray yellow green”, “gray green” and “dark gray”),
although we surveyed Horikaw and Shin-Horikawa in the same day. Our future task is to analyze these states.

84

②Transparency・ＣＯＤ

Transparency and COD differ depending on the area

Tidal Level at Nagoya Port （April 20, 2015）

Falling tide
Rising tidereference: Meteorological Agency
generally good transparency
between Oseko Bridge andShiratori Bridge.

Transparency(75cm)
and COD(5mg/L) at
Shiratori Bridge was
especially good.

Transparency and COD （April 20, 2015）
low transparency
between Oto Bridge
acceptable range for citizens: and Johoku Bridge.
more than 70cm

Transparency （falling tide）

low COD between Oseko
Bridge and Shiratori Bridge.

generally goodtransparency between
Kitashimizu Bridge andMeoto Bridge.

ＣＯＤ（falling tide）

85

③Water Color
Ｗａｔｅｒ Color （April 20, 2015）
1:colorless、2:milky white、7:yellow gray、8:pale gray yellow green、9:gray yellow green、10:gray green、11:dark gray、12:pale yellow grayRiver
BridgeHorikawa Meoto
Shiga
Kitashimizu
Johokuupstream
Nakatsuchido
Gojo
Naka
SakuraTemma
NishikiNaya
Tennozaki
Shinsuzaki
Suzaki
Iwai
Hioki
downstream
Matsushige
Sanno
Oto
Goryo
Shiratori
Oseko
ShinHoragai
Horikawa

6

7

8

9
1↓

10

11

12

Hour
13

9↓
7↓
1212↓
11↓
11↓
11↓
11↓

“pale yellow gray color”

9↓
9↓
9↓
9↓
9↓
9↓
“milky white color”

11↓
11↓
10↓
10↓
10↓
9↓ 10↓
9↓ 10↓
9↓ 10↓

8↓
2↓
10↓

14

15

16

17

18

19

20

Sludge was whirled up
between Naya Bridge
and Gojo Bridge at ebb
tide and the color was“dark gray”
9↓
9↓ 9↓
10↑
9↑ 11↑
9↓
11↑

Water color at this point
was “pale gray yellow
green”.
It was effected by the flow
water (pale yellow graycolor)from Nakagawa Canal.

9↓
7↓
12-

“pale yellow gray color”

Flowing up of white-colored water nor red tide was observed. “Shorthours of sunshine inhibit growth of phytoplankton”、“rainy water of better
quality flows into Horikawa” are thought to be probable reasons.
On the other hand, water color at Horagai Bridge, upsteam area of ShinHorikawa was “pale yellow gray”. The cause of this was not confirmed yet.

86Near Naya Bridge 10:37 am(falling tide)

150 102 105
100

tide level・T.P.（cm）

Rising sludge occurred at ebb current time.

200
107
84

81

50

-20

-26

0

-77

-81

-50

-121

-100

103

38

33

-120
-136

-150
-200
6

7

8

9

10 11 12 13 14 15 16 17 18 19 20
time Source: Japan Meteorological

Agency home page

Rising sludge seems
to occur aroundwater's edges morethan the center ofthe flow.

Near Nishiki Bridge 0:50 pm(falling tide to low tide)

Rising sludge
seems to occur
around water's
edges more thanthe center of theflow.

Naya Bridge 0:40 pm(falling tide to low tide)
Near Naka Bridge 1:10 pm(falling tide to low tide)

Rising sludge was prominently
observed in the area from NayaBridge to Gojo Bridge at fallingtide. The colour of water was'dark grey'.
Rising sludge occurredprominently around water's edges
more than the center of the flow.

87150 102 105
100

tide level・T.P.（cm）～Spring tide general survey in spring～Apr.20,2015
Cloudy light yellow gray water
flowed out from Nakagawa Canal.

200
107
38

33

50

103

84

81

-20

-26

0

-77

-81

-50

-121

-100

-120
-136

-150
-200
6

7

8

9

10 11 12 13 14 15 16 17 18 19 20
time Source: Japan Meteorological
Agency home page

Near Matsushige Lock Gate 11:20 am(the period of ebb tide)

Cloudy water from
Nakagawa Canal
influenced the colourof water near Sanno
Bridge.

88

200～Spring tide general survey in spring～Apr.20,2015

150 102 105
tide level・T.P.（cm
）

100

107
38

33

50

-20

-26

0

-121

-100
-200
6

7

8

9

10 11 12 13 14 15 16 17 18 19 20
time Source: Japan Meteorological

Agency home page

Tennouzaki Bridge 0:30 pm
falling tide to low tideprecipitation

temperature

25

10

20
16.6
15.2

17.5

16.8
15.1

19.1

16.4

14.9

15

18.2

19.9

19.7

17.1

17.9

20.1

20.2

19.9

19.7

8
20.0

19.8
15.2

18.6

6

16.0

15.1
4.0 4.0

14.4

4.0

10

precipitation（mm/h）Naya Bridge 0:42 pm
falling tide to low tide

The colour of cloudy
water from sewer
outlet around Iwai
Bridge, Suzaki Bridge
and Tennnouzaki
Bridge was 'graygreen'.
Around Naya Bridge,
outflow from sewer
outlet did not occur.

-120
-136

-150

Suzaki Bridge 0:20 pm
falling tide to low tide

temperature （℃）

Iwai Bridge 0:15 pm
falling tide to low tide

-77

-81

-50

Cloudy gray green water flowed out
from sewer outlet.

103

84

81

4

3.5
2.5

2.0

5

2

1.5
1.0
0.5

1.0
0.5

0.5

0.0 0.0 0.0 0.0 0.0 0.0

0.5
0.0 0.0

0.0 0.0

0.0

00
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
time

89

～Survey at spring tide ～ April 20th, 2015

④ＳｍｅｌｌChange of the tide level of Nagoya port （April 20th, 2015）

tide levelebb tide

high tide
6:00

7:00

8:00

9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00

Information :Japan Meteorological Agency

time

Change of the smell （April 20th, 2015）
Kind of smell 1:Ditch、2:Sludge、*:No smell

Horikawa River

upstream

ShinHorikawaRiverdownstream

place
Meoto Bridge
Shiga Bridge
Kitashimizu Bridge
Johoku Bridge
Nakatsuchido Bridge
Gojo Bridge*
Naka Bridge*
Sakura Bridge*
Tenma Bridge
Nishiki Bridge
Naya Bridge
Tennozaki Bridge
Shin-Suzaki Bridge
Suzaki Bridge*
Iwai Bridge
Hioki Bridge
Matsushige Bridge*
Sanno Bridge*
Oto Bridge
Goryo Bridge
Ｓｈｉｒａｔｏｒｉ Ｂｒｉｄｇｅ
Oseko Bridge

Horagai
BridgeHragai
Bridge6:00 7:00

8:00

9:00
*↓

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

18:00

19:00

20:00

1↓
*↓
*↓
2↓
2↓
2↓
2↓
1↓
1↓
1↓
1↓
1↓

There were no smell
between Oto Bridge
and Shiratori Bridge.

1↓

1↓
1↓
1↓
1↓

2↓
2↓
1↓
1↓
1↓
1↓
1↓
1↓

*↓
*↓
*↓

1↓
1↓
1↑
1↑

1↑
1↑

1↓

There were smell of sludge
between Gojo Bridge andNaya Bridge at the time of ebb
tide, almost low tide.
The cause of smell is
considered to be the stilled
sludge.

1↓1-90

～Survey at spring tide ～ April 20th, 2015

⑤BubblesChange of the tide level of Nagoya Port （April 20th, 2015）

tide levelebb tide
high tide
6:00

7:00

8:00

9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00

time

Information :Japan Meteorological Agencyth, 2015）
Change of the bubbles（April
20
4.No bubbles、*No data

Horikawa River

upstream

ShinHorikaw
a Riverdownstream

place
Meoto Bridge
Shiga Bridge
Kitashimizu Bridge
Johoku Bridge
Nakatsuchido Bridge
Gojo Bridge*
Naka Bridge*
Sakura Bridge*
Tenma Bridge
Nishiki Bridge
Naya Bridge
Tennozaki Bridge
Shin-Suzaki Bridge
Suzaki Bridge*
Iwai Bridge
Hioki Bridge
Matsushige Bridge*
Sanno Bridge*
Oto Bridge
Goryo Bridge
Ｓｈｉｒａｔｏｒｉ Ｂｒｉｄｇｅ
Oseko Bridge
Hragai
BridgeHoragai
Bridge6:00 7:00

8:00

9:00
4↓

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

18:00

19:00

20:00

4↓
4↓
*4↓
4↓
4↓
4↓
4↓
4↓
4↓
4↓
4↓
4↓

4↓

4↓
4↓
4↓
4↓

4↓
4↓
4↓
4↓
4↓
4↓
4↓
4↓

4↓
4↓
4↑
4↑

4↑
4↑

4↓

There were no bubbles
seen.

4↓
4↓
4↓
4↓
4-

91

tide level⑥Accumulation of litters
Floating substances accumulated
near Matsushige Lock Gate( the dent area)

Accumulation of floating substances

6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00

time
Information :Japan Meteorological Agency

Floating substances
accumulated at the dent
area near Matsushige Lock
Gate.

Matsushige Lock Gate 11:20

92

～Survey at spring tide ～The floating substances accumulatedApril 20th, 2015
at the dent area of waterway, downstream of Naya Bridgetide level

The floating substances accumulated
at the dent area, at the time of ebb tide, 10:41.

6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00

time
Information :Japan Meteorological Agency

Accumulation of floating substances

Floating substances accumulated at
the dent area, at the time of ebb tide.
They moved toward upstream fromthe dent area, at the time of high tide.

Accumulation of floating substances

Floating substances moved toward upstream
at the time of high tide, 16:43.

93

Floating substances accumulatedon the surface at the edge of the tide

tide level～Survey at spring tide ～ April 20th, 2015

6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00

time
Information :Japan Meteorological Agency

Accumulation of floating substances

Dispersion of floating substances

Naka Bridge area 19:05
Floating substances accumulated
Photo: May, 2012 ,Total eclipse of the sun

Sakura Bridge area 19:20
Floating substances dispersed
Water flowed toward downstream, probably because the water from upstreamincreased by the rains.
The accumulation of floating substances were not conspicuous.
They dispersed after the flow toward downstream increased.

94

6.13. The water quality improvement project by sand cover etc.
launched in Feb. 2015

Photo (Under Construction) Jan. 20th 2015

50
95

The water quality improvement project by sand cover etc.
Location: middlsteam area, between Naka Bridge and Gojo Bridge

Report: Kawasemi Survey Group

Between Naka Bridge(in front of the photos) and Gojo Bridge

Feb. 4th 2015
Apr. 6th 2015

Between Gojo Bridge (in front of the photos)
and Naka Bridge

Jun. 3rd 2015

Feb. 4th 2015
Jul. 31st 2015

Apr. 6th 2015

Comparing “with sand cover”
and “without sand cover”
Jul. 31st 2015
The left bank of downstream of Gojo Bridge
With sand coverJun. 3rd 2015

Jul. 31st 2015
The left bank of downstream of Naka bridge
Without sand coverJul. 31st 2015

96

The water quality improvement project by sand cover etc.
launched since Feb. 2015

Observed living things

Improvement of natural purification
by food chain is expected.

Reported by the Kawasemi Survey Group

What kind of living things live andthrive at the sand-covered area?

Birds(river edge)
Water wagtail

Rock doveStarling

Carrion crow

Phoenicurus

Little egret

Turtledove

Spot-billed dock・water wagtail
・starling・phoenicurus・turtledove・rock dove・carrion crow・little egret
・halcyon

W
A
T
E
R
S

Birds(aquatic)
Dabchick

Mandarin dock

Tufted dockTeal・spot-billed dock・dabchick・mandarin duck・tufted duck・teal・mallard
・cormorant

ReptileMallardCormorant

Red eared slider

Group of little mullet

fish
Birds searching food inwater’s edge were observed.
What kind of food for birds isin sand cover area?

Carp

Northern snakehead

・red eared slider

Common bluebottle

・mosquitofish
・carp
・northern snakehead・mullet97

Comparison of before and after clarification test

■ 13th-17th stage
No rain on the day and the previous day◆ Impression of water clearness
Habashita Bridge– Keiun Bridge
巾下橋～景雲橋

during the test

Out of thetest site

水の汚れの印象

5
きれい
clean
4
slightly
ややきれい
clean
3
どちらともいえない
ordinary2
ややきたないslightly dirty
1
きたない
dirty
0
平成25年4月1日
April 1st 2013
平成２５年４月１日

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
April 1st 2015
平成２７年４月１日

平成28年3月31日
March
31st 2016
平成２８年３月３１日

during the test

五条橋～中橋
Gojo Bridge– Naka Bridge
きれい
5
clean

Test site

水の汚れの印象ややきれい
4slightly
clean

improved

どちらともいえない3
ordinary
ややきたない2slightly
dirty
1
きたない
dirty
0
平成25年4月1日
April 1st 2013
平成２５年４月１日

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
April 1st 2015
平成２７年４月１日

Sakura Bridge桜橋～天王崎橋– Tennozaki Bridge

平成28年3月31日
March
31st 2016
平成２８年３月３１日

during the test

きれい
5
clean

Out of thetest site

水の汚れの印象ややきれい
4slightlyclean
どちらともいえない3
ordinary
ややきたない2slightly dirty
きたない
1
dirty
0
平成25年4月1日
平成２５年４月１日
April 1st 2013

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
平成２７年４月１日
April 1st 2015

平成28年3月31日
平成２８年３月３１日
March
31st 201698

Comparison of before and after clarification test
◆ Evaluation of impression of water clearness
巾下橋～景雲橋
Habashita Bridge– Keiun Bridge■ 13th-17th stage
No rain on the day and the previous day

during the test

Out of thetest site

水の汚れの印象の評価

その他
others7
生き物の様子living things
6
bubbles
あわ5
garbageごみ4
transparency
透明感3におい
smell2colors色10
平成25年4月1日
April 1st 2013
平成２５年４月１日

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
April 1st 2015
平成２７年４月１日

五条橋～中橋
Gojo Bridge– Naka Bridgeothers
その他
7

水の汚れの印象during the test

evaluation of color andtransparency increased

living things
生き物の様子
6

Test site

平成28年3月31日
March
31st 2016
平成２８年３月３１日

bubblesあわ5garbageごみ
4
transparency
透明感3
smell
2
におい
colors色10
平成25年4月1日
April 1st 2013
平成２５年４月１日

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
April 1st 2015
平成２７年４月１日

Sakura Bridge 桜橋～天王崎橋– Tennozaki Bridge

平成28年3月31日
March
31st 2016
平成２８年３月３１日

during the test

その他
7othersOut of thetest site

水の汚れの印象

生き物の様子6living things
あわ5
bubblesごみ
4
garbage
透明感
transparency
3
におい
2
smell
色1
colors0

April 1st 2013
平成25年4月1日
平成２５年４月１日

April 1st 2014
平成26年4月1日
平成２６年４月１日

平成27年4月1日
April 1st 2015
平成２７年４月１日

平成28年3月31日
March
31st 2016
平成２８年３月３１日

99Comparison of before and after clarification test
◆ Transparency
巾下橋～景雲橋
Habashita Bridge– Keiun Bridge■ 13th-17th stage
No rain on the day and the previous day

during the test

100

Out of thetest site

透視度（cm）

80
60
40
20
0
平成25年4月1日
April 1st 2013
平成２５年４月１日

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
April
1st 2015
平成２７年４月１日

Gojo Bridge五条橋～中橋– Naka Bridge

平成28年3月31日
March
31st 2016
平成２８年３月３１日

during the test

100

Test site

透視度（cm）

80

Slightly improved

60
40
20
0

平成25年4月1日
平成２５年４月１日
April 1st 2013

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
平成２７年４月１日
April
1st 2015

Sakura Bridge – 桜橋～天王崎橋
Tennozaki Bridge

平成28年3月31日
March
31st 2016
平成２８年３月３１日

during the test

100

Out of thetest site

透視度（cm）

80
60
40
20
0

平成２５年４月１日
平成25年4月1日
April 1st 2013

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
平成２７年４月１日
April
1st 2015

平成28年3月31日
March
31st 2016
平成２８年３月３１日

100Comparison of before and after clarification test
◆ COD
巾下橋～景雲橋
Habashita Bridge– Keiun Bridge■ 13th-17th stage
No rain on the day and the previous day

during the test

20
18

Out of thetest site

ＣＯＤ（mg/L）

16
14
12
10
8
6
4
2
0

平成25年4月1日
平成２５年４月１日
April 1st 2013

平成26年4月1日
平成２６年４月１日
April 1st 2014

平成27年4月1日
平成２７年４月１日
April
1st 2015

Gojo Bridge五条橋～中橋– Naka Bridge

平成28年3月31日
March
31st 2016
平成２８年３月３１日

during the test

20
18

Test site

ＣＯＤ（mg/L）

16

Slightly improved

14
12
10
8
6
4
2
0

平成２５年４月１日
平成25年4月1日
April 1st 2013平成２６年４月１日
平成26年4月1日
April 1st 2014

平成27年4月1日
平成２７年４月１日
April
1st 2015

Sakura Bridge – 桜橋～天王崎橋
Tennozaki Bridge

March
31st 2016平成28年3月31日
平成２８年３月３１日

during the test

20
18

Out of thetest site

ＣＯＤ（mg/L）

16
14
12
10
8
6
4
2
0
平成25年4月1日
April 1st 2013
平成２５年４月１日

平成26年4月1日
April 1st 2014
平成２６年４月１日

April
1st 2015
平成27年4月1日
平成２７年４月１日

March
31st 2016平成28年3月31日
平成２８年３月３１日

101

Comparison of before and after clarification test
◆ Occurrence of Smell
Habashita Bridge– Keiun Bridge
巾下橋～景雲橋■ 13th-17th stage
No rain on the day and the previous day

during the test

Out of thetest siteにおいの発生状況5におわない
no smellslight
ややにおう
smell
4
3
におう
smell
2
ややひどくにおう
bad smell

terrible
ひどくにおうsmell
10
平成25年4月1日
平成２５年４月１日
April 1st 2013

平成26年4月1日
平成２６年４月１日
April 1st 2014

平成27年4月1日
平成２７年４月１日
April
1st 2015

Gojo Bridge– Naka Bridge
五条橋～中橋

平成28年3月31日
March
31st 2016
平成２８年３月３１日

during the test

Test siteにおいの発生状況5におわない
no smell

ややにおう4slightsmell

No clear change

3
におう
smell
2
ややひどくにおう
bad smell
1
ひどくにおうterriblesmell
0
平成25年4月1日
平成２５年４月１日
April 1st 2013

平成26年4月1日
April 1st 2014
平成２６年４月１日

平成27年4月1日
April
1st 2015
平成２７年４月１日

Sakura Bridge 桜橋～天王崎橋– Tennozaki Bridge

March
31st 2016平成28年3月31日
平成２８年３月３１日

during the test

Out of thetest siteにおいの発生状況

5no smellにおわないslight
smell
4
ややにおう
3
smell
におう
2
bad smell
ややひどくにおう

terriblesmell
ひどくにおう
10

平成２５年４月１日
平成25年4月1日
April 1st 2013

平成26年4月1日
平成２６年４月１日
April 1st 2014April
1st 2015
平成27年4月1日
平成２７年４月１日

March
31st 2016平成28年3月31日
平成２８年３月３１日

102

6.14. Progress of Citizen’s Awareness
Activities of Studies

読売新聞 平成２７年３月１日(日）朝刊より

伊勢湾流域圏再生フォーラム
平成２７年２月２８日（土）報告：事務局

第４回堀川ラウンドテーブル 開催
キャッチコピー「いつも心に川がある」
堀川まちづくりの会
平成２６年３月１９日（木）堀川１０００人調査隊2010 第１６回調査隊会議
平成２７年２月１５日（土) 報告：事務局

堀川上流散策社団法人日本セカンドライフ協会 御一行
平成２７年４月４日（土）報告：御用水跡街園愛護会調査隊

103

Progress of Citizen’s Awareness Activities of Studies
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・ロマン黒川春の環境デーなごや２０１５
平成２７年６月６日（土）飯田小学校３年生 堀川体験学習
平成２７年６月６日（土）名北小学校３年生 黒川観察会
平成２７年６月１６日（火）

清掃活動とコスモスの苗植え
場所：北区の北清水親水広場周辺
主催：黒川ドリーム会

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」主催：名古屋市環境局
運営協力：名古屋堀川ライオンズクラブ
場所：熱田区白鳥桟橋

正木小学校５年生 黒川観察会
平成２７年６月２３日（火）大杉小学校２年生 堀川観察会
平成２７年６月２５日（木）堀川歴史探索 高年大学
平成２７年６月２３日（火）報告：御用水跡街園愛護会調査隊
笹島小学校５年生 堀川観察会
平成２７年７月２日（木）平成２６年度 堀川浄化活動報告書
鯱城・堀川と生活を考える会

104Progress of Citizen’s Awareness Activities of Studies

Inspectorates of waterworks and sewage bureau in
Mexico City visited Horikawa River

新堀川フォーラム 「新堀川の水質を考える」 平成２７年７月７日（火）第５回 堀川ラウンドテーブル 堀川まちづくりの会
平成２７年７月３１日（金） 報告：事務局

105

Horikawa Clean Experiment with Chinese Water Spinach and SunPatiens
By Ena agricultural High School, Nagoya Horikawa Lions Club and Especmic corporation
Place：near the pier of Naya Bridge
実験開始３日目 ６月２２日

第４週間目 ７月２７日

第１週間目 ６月２９日

第５週間目 ８月４日

第２週間目 ７月６日

集まってきた生き物たち

ボラ幼魚とカダヤシ

ミシシッピアカミミガメ

第３週間目 ７月２２日

ベンケイガニとハゼの仲間

ボラ幼魚

ウナギ

106

Activities of “Free Survey Groups” & “Cheering Groups”
定点観測の活動報告
名古屋市高年大学２９期調査隊 平成２７年１月～３月分

志賀橋上流側左岸に井戸水を引き上げるポンプを設置
平成２７年１月 工事開始
撮影：名古屋市

志賀橋地下水通水式 平成２７年３月２５日（水）報告：御用水跡街園愛護会調査隊

中日新聞 平成２７年３月１９日（木） 朝刊より

昔の町並みなどの写真を掲載した銘板を設置
北区役所まちづくり推進室
平成２７年３月１１日（水）報告：御用水跡街園愛護会調査隊

水質調査活動報告 明電舎錦調査隊
平成２６年８月～平成２７年３月まで

107

http://www.horikawa1000nin.jp/katudou/2015-05-11-meidensha.htm

Activities of “Free Survey Groups” & “Cheering Groups”
第６回 春の堀川一斉大そうじ
主催：クリーン堀川
平成２７年４月１８日（土）報告：御用水跡街園愛護会調査隊
事務局
名古屋友禅を体験
平成２７年４月１８日（土）／７月２０日（月）案内・報告：御用水跡街園愛護会調査隊
堀川ギャラリー「不思議な堀川」展示会
平成２７年６月２日（火）報告：御用水跡街園愛護会調査隊

中日新聞 平成２７年６月２５日（木）朝刊より

清掃活動
中日本建設コンサルタント㈱かわせみ調査隊
場所：錦橋～納屋橋間
平成２７年５月７日（木）清掃活動
ぎふしんムーミン清水支部
堀川応援隊
場所：北清水橋周辺
平成２７年６月１３日（土）堀川ギャラリー故・丹坂和義さんの「昭和の納屋橋」作品展
平成２７年６月２５日（木）報告：御用水跡街園愛護会調査隊

108Activities of “Free Survey Groups” & “Cheering Groups”
広報パンフレットを作成
名古屋堀川ライオンズクラブ
平成２７年３月

機関誌「クリーン堀川２０１５・３ 第１８号」発行
市民団体 クリーン堀川

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

活動レポート：
伊勢湾流域圏再生ネットワーク事務局

新堀川水質調査報告
チームＮＴＴスマイルなごや
平成２６年１月～
平成２７年7月分

活動レポート：
環境ボランティアサークル「亀の子隊」
フリーペーパー 「中区フリモ ２０１５．５ vol.１４」に
堀川１０００人調査隊が特集記事として掲載

109フラワーハンキングバスケットづくり
平成２７年４月１６日（木）報告：御用水跡街園愛護会調査隊

Events

中日新聞 平成２７年４月５日（日） 朝刊より

堀川友禅流し平成２７年４月４日（土）主催：北区役所
北区民まちづくり推進協議会
報告：事務局

桜山「木祖村アンテナショップ」
平成２７年６月１２日（金）～リニューアルオープン
撮影：御用水跡街園愛護会調査隊

堀川フラワーフェスティバル２０１５開幕
平成２７年５月８日（金）～２３日（日）報告：御用水跡街園愛護会調査隊

110Events

中日新聞 平成２７年５月１５日（土）朝刊より

第１１回「堀川エコロボットコンテスト２０１５」説明会 平成２７年５月１６日（日）主催：名古屋堀川ライオンズクラブ 協賛：名古屋工業大学

宮の渡し公園「堀川まつり」
平成２７年６月６日（土）～６月７日（日）報告：御用水跡街園愛護会調査隊

なごや水フェスタ(鍋屋上野浄水場解放イベント）
平成２７年６月７日（日）参加：名古屋市高年大学環境学科２９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

水辺で乾杯at堀川 納屋橋シャムズガーデン
堀川応援隊 ミズベリング・ミズ中部
平成２７年７月７日（火）111Activities of “Free Survey Groups” & “Cheering Groups”
中日新聞
平成２７年６月２５日（木） 朝刊より

読売新聞
平成２７年７月２３日（木） 朝刊より

中日新聞
平成２７年７月２８日（火） ～８月２日(日)朝刊より

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毎日新聞
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