first
inquiry
Nature
Munakata River
About Tsuragawa
Turikawa originates in the forest of Yoshidome, Munakata City, at the border with Miyawaka City, flows east and west through the city while merging with tributaries such as Asamachi River, Hachinami River, Yamada River, and gradually flows north. It is a second-class river that merges with the Tarumi River and extends to the Genkai Sea at Eguchi, about 16 km in length, and the basin area is about 99 km².
Humans began to live in the Munakata region in the late Paleolithic era, about 30,000 to about 10,000 years ago, and in the later Jomon period (about 10,000 to 2,300 years ago) Several archeological sites have been found. It is thought that during the Jomon period, the sea entered the inland along the fishing river, and the surrounding area was covered with thick oak and shii forests.
In the Yayoi period (from about 2,300 to about 1,700 years ago), the sea that had penetrated deep inland retreated, fertile plains spread along the fishing river, rice was grown, and many people settled in, I started to create unevenness. Since then, from the Kofun period (from the end of the 3rd century to the middle of the 7th century) to just a few decades ago, the fishing river has been carefully preserved as an important agricultural water source, and various river improvement works have been undertaken for flood control and water use. Has been done.
Environment surrounding the river
The river water system spreading almost in the center of Munakata city is separated from the water system of other neighboring area by the 200-500 m dividing ridge (Bunsui * 1) which surrounds this area and it is an independent water system.
|
number
|
Name (reading)
|
|---|---|
| 1 | Amida River (Ayamidagawa) |
| 2 | Shinkawa (Shinkawa) |
| 3 | Muta River (Musuwa) |
| 4 | Tanogawa (Tanaka) |
| 5 | Mami river (Moromi gawa) |
| 6 | Maekawa (mae kawa) |
| 7 | Tarumi River (Torurumigawa) |
| 8 | Konno river (Nagano no Owa) |
| 9 | Aki Sumikawa (Akumi mikagawa) |
| 10 | Yoshida River (Yoshida Rawa) |
|
number
|
Name (reading)
|
|---|---|
| 11 | Yokoyama River (Yokoyama Gawa) |
| 12 | Shijuri River (Shiyuurigawa) |
| 13 | Oigawa (Ogawa) |
| 14 | Ms. Yoshiyama (Tachiyamagawa) |
| 15 | Hachimune River (Yatsunami Kakawa) |
| 16 | Yamadagawa (Yamadakawa) |
| 17 | Morning Machi River (Asamichigawa) |
| 18 | Matsumoto River (Matsumoto Tofu) |
| 19 | Shakain River (Shakaigawa) |
| 20 | Takasegawa (Takase Gawa) |
|
number
|
Name (reading)
|
|---|---|
| 21 | Komori River (Overweight) |
| 22 | Child descent river (Kokudasagawa) |
| 23 | Cotton Itsukawa (Wotachigawa) |
| 24 | Nakayama River (Naka yagamagawa) |
| 25 | Arawa River (Araragawa) |
| 26 | The remnant river (Nagoragawa) |
| 27 | Kugu River (Hisato Gawa) |
| 28 | Miyakawa (Miyakawa) |
| 29 | Sarutado River |
| 30 | Hirayama River (Hirayama gawa) |
The mainstream originating from the mountainous area of Munakata-shi Yoshitomi goes down the course of about 16 km and flows into the Genkai-Nada. There are many tributaries that source to the mountains on both sides of the mainstream and merge along the way and their secondary tributaries are Morning Machi River, Takase River, Hakkado River, Yamadagawa River, Yokoyama River, Tarumi River etc. However, It does not exceed half of mainstream. The catchment area is also about 99 kilometers and the scale of the whole water system is not large.
※ 1 mountain range that is becoming a watershed. Peak of mountains that divide rainwater into different water systems. District mountain ranges.
River basin with many lowlands
The river basin area is larger than the length of the river, and in the downstream part the hills protrude, forming a narrowed part (Kyushaku * 1) near Munakata Taisha etc.
The slope of the fishing river is quite loose except for the upstream part, and several tributaries gather together with the mainstream near Downtown Togo. Therefore, if there is intense heavy rainfall, the fishing river is easy to accumulate in the vicinity of the narrowed part and confluence part, making it easy to flood widely. The lowland part of the Hikawa Plain is a very low and flat state without any natural embankment-like micro relief. This is said to be due to overflowing water overflowing, flooding and flood and sediment deposition repeatedly.
In the concentrated torrential rain on June 28, Showa 28, it was flooded also along the coast of the river, and the Kagoshima Main Line also became inoperable.
※ 1 It is narrowing narrowly.
The water situation of Munakata
Munakata City became the current “form” after the merger of former Munakata City and Genkai Town in 2003 and the merger of Oshima Village in 2005.
In Munakata City, with the rapid economic growth that began in the 1955s, the Kagoshima Main Line was electrified in 1956, and the development of large-scale residential complexes such as Jiyugaoka and Hinosato, which became the foundation of today's residential city. Has begun and the population has increased rapidly.
At the same time, the amount of water used in daily life has increased, and the Oi Dam and the Yoshida / Tare Dam have been built to use the water from the fishing river as living water. Many agricultural wells are built in the middle of the river, and they are stopped every year from mid-May to mid-October and used as agricultural water, so pumping water to the Oi Dam (reservoir). Was limited to other times. (Oi Dam has not been used for water supply since 2011 due to receiving water from Kitakyushu City.)
In addition, the water intake for the dam is located downstream from the treated water drainage at the final treatment plant, so Munakata City also recycles tap water.
Pollution of the river progresses with population increase and urbanization. However, with the improvement of public sewerage, pollution by domestic wastewater is decreasing. In addition, pavement of roads and three-sided rivers have prevented rainwater from penetrating underground, and degraded forests, such as conspicuous bamboo forests, have reduced water source recharge functions and reduced groundwater. .
The water from the fishing river is used as agricultural water for producing rice and vegetables, or as our important drinking water, but it is no longer clean water like in the past. We need to reconsider the importance of the river, consider the river and protect it, and get to know it.
what we can do
Now, rivers are polluted with domestic wastewater discharged from our daily lives.
Most of the tap water everyone drinks uses river water. Here are some ways to clean the river with a little care.
Know the properties of the detergent before use and use it well.
It is also effective as fertilizer.
Take your garbage with you on your drive or holiday.
MUNAKA "Water and Green Association"
What you are doing
Waterside and Greenery Association was established on November 30, 1991, and plans and implements various activities in cooperation with the government to protect the nature of Munakata and our living environment, not to mention Tsuragawa. . Anyone can join the "Water and Green Association", and the activities of the association are introduced in the city's public relations papers, so please feel free to participate.
① Research and research business
We conduct surveys and research on the conservation of nature and living environment of Munakata, mainly by experts and teachers, such as water quality survey of the Tsuragawa, distribution survey of living things, water purification, landscape study, fostering of water source cultivation forest.
② Activity business
Develop specific activities to preserve Munakata's natural and living environment. It is important to gather the power of each person. I would like many citizens to participate, including members. Specifically, we conduct soap making using waste food oil, survey firefly distribution, firefly cultivation, breeding and release, clean operations (empty cans, picking up trash), etc.
③ Public relations and education business
Lectures and study sessions are held at mini environment courses in Munakata City, so please apply if you have any requests.
Fukuoka Prefecture and Munakata City
What you are doing
① River improvement
Protecting our lives and property from the flood is of paramount importance. For this purpose, river improvement works such as embankment and revetment work have been performed. However, these works have taken away the creatures living there. Therefore, construction has begun to consider creatures such as fishways, fireflies, seawalls, and fishing nest blocks.
② Improvement of sewerage
House drainage that used to flow into the river in the past is collected by maintaining sewers, and is then cleared and released into the river. However, various chemical substances have been used in the home, and it is possible that existing sewerage facilities could not process them and could be released with dangerous substances.
③ Monitoring and investigation of water quality
We monitor the river to keep it clean and regularly check the water quality.
広 Publicity and enlightenment activities for citizens
On various occasions, public relations papers and flyers are used to promote PR and enlightenment activities to citizens.
利用 Use of waterside
Citizens have been familiar with the fishing river, and have been improving the riverside park so that the fishing river can be used as a place to relax.
⑥ Cultivation of water source reforestation
In order to secure groundwater and river water, we use the forest environmental tax in Fukuoka Prefecture, conduct degraded forest regeneration projects, and cooperate with forest unions to protect mountain greenery.
美 Beautification activities
We cooperate with citizens and volunteer groups to mow banks and pick up trash.