Dam in Kagawa Prefecture

3048-Honenike Dam

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Dam in Kagawa Prefecture
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Location: Gogo, Onohara-cho, Kanonji City, Kagawa Prefecture
Date of interview: Wednesday, November 17, 2010

CR-V and Toyotoshi Pond Dam

CR-V and Toyotoshi Pond Dam

The family's main trip was the Anpanman Museum and the Anpanman Train, but this was one of the main things for me. After crossing the Great Seto Bridge and eating Sanuki udon in Kagawa, we arrived at the Toyotoshi Pond Dam! Here is a two-shot of me and my late CR-V.

Unfortunately, although the weather was fine that day, if you visit a little late in the afternoon during this season, it is completely backlit. I had not been using an SLR camera for very long, so I took a few pictures, but when I looked at them at home, they were so dark that I felt defeated that I could hardly use them.

And perhaps the most important reason was that I was still buoyed by my first visit to Toyotoshi Pond.

View of the river downstream from the bridge downstream

View of the river downstream from the bridge downstream

But that is not the case with the Toyotsu Pond Dam. I'm sure you can understand that the Toyotsu Pond Dam is quite a distinctive dam just by looking at it.

1. an old dam made of masonry, started in 1926 and completed in 1930
2. "Multiple" with a series of archesarch damFormalities called
3. siphon-type flood discharge

This is a major feature of the system.

View of the monument and embankment from downstream

View of the monument and embankment from downstream

It has a flood discharge capacity of 78 m3/s, with four 10.9-meter-topped weirs and five siphon-type flood discharges at the abutments between the arches. It has three intake gates, one Φ600mm slew gate and two Φ600mm slew valves. It also has a sediment discharge gate and one 1200 mm through gate.

View of the levee from downstream

View of the levee from downstream

It is a levee that combines elegance and style so wonderful that it makes me sigh. To tell the truth, I feel foolish for writing this rambling article.

The Toyotoshi Pond Dam was completed in 1930, but after half a century, it began to show signs of aging, such as leaks, etc. Renewal work began in 1988, and the dam was reborn as the new Toyotoshi Pond Dam in 1994. However, it seems that the renewal work was carefully carried out so as not to spoil the appearance of the distinctive embankment. It is very important to maintain and continue to use this historic dam.

View of the reduction work

View of the reduction work

I'm going to love every part of it now.

View of the reduction work

View of the reduction work

It has a complex shape. And if someone who knows little about dams saw it, they would not think it was part of a dam.

View of the levee surface

View of the levee surface

It has a nice surface. The darkening of the surface gives it more character.

Siphon flood discharge

Siphon flood discharge

Toyotoshi Pond Dam releases water every year in early summer. This is called "yuru-nuki. The origin of the word "yuru-nuki" is said to come from "pulling out" the "yuru (water intake valve)" before rice planting. Originally, it was a ceremony to pray for a good harvest. This is proof of the importance of this water source.

View of the levee from downstream

View of the levee from downstream

This is it, this is it. This is what I wanted to see!
I thought...but Abat was the front...lol...

View of the reduction work

View of the reduction work

It is slanted with excitement.

View of the levee from downstream

View of the levee from downstream

It looks great from any angle.

View of the levee and park from the left bank

View of the levee and park from the left bank

The autumn leaves are changing color nicely. But the main character is the Toyotoshi Pond Dam. The autumn leaves are only a complement to the dam.

Looking up the embankment from the left bank

Looking up the embankment from the left bank

The Toyotoshi Pond Dam was designed by Tojiro Sano and built by local people. In other words, these famous embankments may continue to be loved and protected for a long time because they were built by local people.

Tojiro SanoKobe City website(Adapted and partially modified from)

Born in Nagoya, Japan. Graduated from the University of Tokyo in 1894 with a degree in civil engineering. Worked for Osaka City Waterworks for about 3 years.
In 1894, he became a commissioned engineer to assist Mr. Chosaku Yoshimura, Director of the Construction Department, in starting the construction of the Kobe Magazine's waterworks in its inaugural year. In March of 1897, he took over the position of the second in charge, Mr. Sonao Kasuya, upon his retirement.

In July 1905, he retired from Kobe City and became the chief engineer of the Korean Waterworks Bureau, where he spent four years, during which time he was commissioned by Kobe City to devote himself to the construction of the Kobe City waterworks system. He received a doctorate for his invention of concrete for waterworks.

In May 1919, Mayor Kashima established the Urban Research Department and appointed Sano as the department head for the construction of Greater Kobe City.

Wuyuan Reservoir Largeweir(In designing the Tachigahata Dam, he observed and studied new construction methods in India, and built the stone weir that can be seen today.

It looks like a giant god soldier.

It looks like a giant god soldier.

Looking up at Abat from directly below, it reminds one of the Giant God Warriors in Miyazaki's anime.

View of the levee from downstream on the left bank

View of the levee from downstream on the left bank

It's beautiful no matter how many times I see it.

Old sediment discharge sluice (right) and old mid-sluice intake (left)

Old sediment discharge sluice (right) and old mid-sluice intake (left)

The old sediment discharge sluice (right) and the old mid-basin intake (left) are installed at the dam site on the downstream side of the right bank. This is also beautiful.

View of the top edge and the levee downstream from the left bank

View of the top edge and the levee downstream from the left bank

We then move on to the top edge level. As expected, entry inside the top end was prohibited. And you can see that the construction on the dam lake side is quite different. It is beautifully rounded. It must have been difficult for the technology of the time. It is just my imagination.

View of the dam lake from the left bank

View of the dam lake from the left bank

The water level of the dam lake is a bit low.

View of the levee from the downstream side of the left bank

View of the levee from the downstream side of the left bank

It was a breathtakingly beautiful "famous dike". I would definitely like to visit again during the Yurunuki season. The grass in the park downstream is covered with green, and the dynamic discharge of water from the embankment by Yurunuki.... Just the thought of it makes me sigh.

Toyotoshi Pond Dam specifications (data in parentheses are before redevelopment)

River NameTanokuchi River (Quercus serrata)
ObjectiveFlood control, agricultural disaster prevention, irrigation water (irrigation water)
Modelmultiple arch dam
Bank height30.4m (32.3m)
Bank length128m (158.4m)
Dam volume40,000m3 (21,000m3)
Watershed Area8km2 (9.9km2)
Reservoir area15ha (16ha)
Total storage capacity1,643,000m3 (1,590,000m3)
Effective water storage capacity1,593,000m3 (1,590,000m3)
Dam operatorKagawa Prefecture (Toyotoshi Pond Land Improvement District)
Main body constructorShimizu Corporation, Fujita (directly managed by Kagawa Prefecture)
Year of launch1988 (-)
Year Completed1994 (1930)

Other facilities/observations

It is a tourist spot, so it is well maintained, but it is not a place where souvenir shops are located. You can quietly watch the famous embankment.

Parking lot
Toilet
Park
PR Exhibition Hall×
Fishing?

Accommodations that may be close to Toyoten Pond Dam

This article was written by.
Shin Jinma

Dam enthusiast who loves Momosuke Fukuzawa / Dampedia and Dam News administrator / Certified Dammeister (01-018) by the Japan Dam Foundation / Started selling discharge caution goods.https://shop.dampedia.com

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