Dam in Kochi Prefecture

2322-Sameura Dam

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2322-Sameura Dam Dam in Kochi Prefecture
This article can be read in about 5 minutes to read.

Location: Tai, Tosa-cho, Tosa-gun, Kochi
Date of interview: Thursday, 11/18/2010

View of the embankment on the lake side from the right bank

For me, this place could be a sacred place. The Hayamoura Dam was the object of my highest longing. It reminded me of the time when I first became a dam maniac and had my heart set on the Kurobe Dam (in Toyama). However, unlike those days, I have seen many dams, but this is the legendary Hayamyoura Dam. I cannot help but be reminded of it.

Hayamoura Dam Management Office

Day 2 of my trip to Shikoku. It was the day I did something that others might think was stupid: I took the Anpanman train from Kochi to Okayama (and back) for my son. From Okayama, we returned to Kochi, and from Kochi, we took a car to Hayamoura. I arrived just a few minutes before 17:00, hoping to get a dam card since I was there. It was dusk and I thought I had to quickly get a dam card and take some pictures, but the person at the management office was quite friendly and we ended up talking for a while.

The person from the management office was originally from Nagoya and often visited my town, so he knew a lot about local businesses. I was surprised that he would come to Shikoku and talk about his hometown.

View of the levee downstream from the right bank

It was too dark and difficult to photograph. It was during the magic hour, but I am not a good photographer, so please forgive me. I was pressed for time and could not enjoy the dam that I had longed for so much....

The Life of Shikoku."

Speaking of the Hayamoura Dam, this stone monument cannot be missed. Although only local people may understand the water situation in Shikoku, Shikoku has always been in a battle against water. In this age of the declaration to abandon dams and calls for the sorting out of dam projects, there is no such thing as an unnecessary dam. This dam proves it.

View of the embankment on the lake side from the right bank

It was completely dusk and the top lighting was on.

Looking toward the skyline from the right bank

It is a wide and long top. The top of the embankment is 400 meters long and 6 meters wide.

View of Gate Pier

I feel that steel-framed gate piers are one of the features of Shikoku's dams. I personally like the cool combination of a concrete embankment and a steel-frame gate pier.

View downstream from the top

It's a large abatement pond that looks like a swimming pool. For some reason, the sub-dam is deep and has a slightly unusual shape among the sub-dams I have seen so far. There is a tennis court, which is usually installed in the dams of the Japan Water Agency, just below the right bank, and the Hayamaura Power Station of the Japan Power Development Corporation is just below the left bank.

View of roller gate

It was being painted or scaffolding was being erected. It's about to be nicely cosmetized.

View of Lake Sameura from the top

In the summer of 2005, the dam experienced a severe drought and had to release water for power generation and even used its dead water capacity, which is not normally used for water utilization, in an emergency situation. However, on September 5, heavy rains caused by Typhoon No. 14 brought the reservoir to 100% in just one day! This is the legend of the Hayamoura Dam. It is not often that we hear of a dam that went from a 0% water storage rate to 100% in a single stroke.

Power Development Hayameura Power Station

The Hayamaura Power Station of the Japan Power Development Corporation (J-Power) generates 42,000 kW of electricity. Downstream is the Yamasaki Dam, which serves as a reverse regulating reservoir, but this dam is treated as a weir because its embankment is less than 15 meters high. I would have liked to see the weir, but it was nighttime and I could only catch a glimpse of it from the national highway.

View of Gate Pier

This has become my personal favorite photo. Only the silhouette of the steel frame stands out against the evening sky, making the gatepiers look even cooler and cooler.

Gate winders for selective water intake facilities

This is a gate hoisting machine for selective water intake facilities. There is no building, probably to save construction costs.

View of selective intake facility

Like the gate winder, the selective water intake equipment is very simple and the equipment itself is bare. The fact that it is not solidified with concrete or built-in type gives it a rather good flavor.

View of the top edge from the left bank

It turned out to be a magic hour-like photo, but I have mixed feelings about it because I didn't aim for that. It was so dark that I couldn't really tell what it was.

View of the embankment on the lake side from the left bank

The embankment stands tall in the darkness.
It is a figure quietly but strictly protecting Shikoku.

View of the levee downstream from the left bank

I don't remember messing with the camera settings, but from here on out the picture is unusually bright, lol.
Please forgive me if I think the exposure probably changed automatically....

View of the levee from the observation park on the right bank

If it were a little higher, it would give the impression that the dike is supporting the water, but the water level was a little low, so I couldn't get that feeling (sweat).
I would have rather had a lookout on the left bank....

View of the embankment on the lake side of the dam from the observation park on the right bank

Wow, that's cool.

View of the levee from the bridge downstream

Then, on the way back, we moved to the bridge downstream to see the levee. I was supposed to be directly in front of it, but it was hard to recognize in the darkness, and this picture shows that I was slightly to the left.
At that time, I didn't have a tripod yet and I didn't know how to photograph night scenes at all, so I didn't take on the challenge, which I now regret.

No, but it is cool.
A legendary dam that I had only seen in news footage and photographs. It has become one of the dams I would like to revisit again.

Hayamoura Dam Specifications

River NameYoshino River System Yoshino River
ObjectiveFlood control, agricultural disaster prevention, unspecified water, river maintenance water, irrigation water, water supply water, industrial water, power generation
Modelgravity-fed concrete dam
Bank height106m
Bank length400m
Dam volume1,200,000m3
Watershed Area472km2
Reservoir area750 ha
Total storage capacity316,000,000m3
Effective water storage capacity289,000,000m3
Dam operatorShikoku Land Construction → Water Authority of Japan, 1st Engineering Dept.
Main body constructorset of staggered shelves
Year of launch1965.
Year Completed1978
Name of Dam LakeLake Hayamiura

Other facilities/observations

right bank (shore)interpoint (interword separation)left bank (of a river)Another feature of this dam is that there are many points of interest to visit both upstream and downstream.

Parking lot
Toilet
Park
PR Exhibition Hall×
Fishing

Accommodations that may be close to Hayamoura 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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