Okayama Prefecture Dam

1864-Gokurakuji Pond / Okayama Prefecture

3.0
1864-Gokurakuji Pond Okayama Prefecture Dam
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Date of interview: Wednesday, 12/10/2014

The fourth reservoir of the day was Gokurakuji Pond. As the name suggests, there is a historic temple called Gokurakuji upstream of the reservoir, which was opened during the Wado Period.

View of the downstream face of the levee and the conduit from downstream

It can be viewed from downstream, and although it is not so touristy, it has a mysterious appeal. As you can see, it is an earth dam.

View of the downstream face of the levee and the conduit from downstream
View of the downstream face of the levee and the conduit from downstream

View Force Reduction Works

This is a unique abatement structure. The back (upstream side) is an impact block and the front (downstream side) is an end sill. The drainage pipe on the left is probably from a drain.

View Force Reduction Works
View Force Reduction Works

downstream face of embankment

The downstream face of the earth dam is not particularly noteworthy, but it appears that a stairway that can be ascended from the top edge was originally installed on the left bank side on the right side of the photo.

downstream face of embankment
downstream face of embankment

monument to commemorate the reconstruction of a building

According to the dam handbook, the original Gokurakuji Pond was completed in 1943, but as part of the Okayama Prefecture-operated land improvement project for reservoirs, etc., construction work to renovate the embankment began in April 1985 and was completed in March 1990. This monument was erected to commemorate the reconstruction.

monument to commemorate the reconstruction of a building
monument to commemorate the reconstruction of a building

However, the Gokurakuji Pond was damaged by Makurazaki Typhoon on September 17, 1945, which caused 46 deaths and 20 houses to be damaged. Furthermore, during the aforementioned renovation work, a water leakage accident occurred in July 1987. The leakage accident occurred immediately after the renovation, and the renovation work was originally scheduled to be completed in about two years.

岡山県における溜池の実態
J-STAGE

Looking downstream from the right bank

It is hard to believe that there has been such a tragedy in the current situation.

Looking downstream from the right bank
Looking downstream from the right bank

View of the top edge from the right bank

The top end is not forbidden to motor vehicles, but it is better for your own safety not to proceed as it dead-ends at this point (lol).

View of the top edge from the right bank
View of the top edge from the right bank

View of the reservoir from the top

The upstream end of the reservoir, which is not very large, is easily seen. The area where the Gokuraku-ji Temple is located can be seen in the back. In front of the gate is a cenotaph for the victims of the 1945 flooding. There are no words to describe how hellish it must have been at that time.

The slant-flume water intake system is glimpsed on the right of the photo.

View of the reservoir from the top
View of the reservoir from the top

View Residual Water Discharge

The spillway is a side channel type, which is common in fill dams.

View Residual Water Discharge
View Residual Water Discharge

Looking downstream at the residual water discharge

It is also unique in that the leading part flows slightly horizontal in the downstream direction and slopes at the end of it. I think this is done to reduce the flow.

Looking downstream at the residual water discharge
Looking downstream at the residual water discharge

Looking downstream from the top

Can you see its conduit slightly horizontal on the left of the photo?

Looking downstream from the top
Looking downstream from the top

View of the top edge from the left bank

It is a simple top end typical of earth dams.

View of the top edge from the left bank
View of the top edge from the left bank

Looking upstream from the left bank

The slope protection on the upstream side of the embankment is concrete blocks.

Looking upstream from the left bank
Looking upstream from the left bank

Looking upstream from the right bank

Although the earth dam was destroyed by Typhoon Makurazaki during the chaotic period immediately after the end of the war, the Gokurakuji Pond was repaired and is still being carefully used to enrich the 105.5 ha of agricultural land in the Oda district of Kagamino-cho.

Looking upstream from the right bank
Looking upstream from the right bank

Gokurakuji Pond

According to the dam handbook, the embankment height is 17.7 m, the embankment crest length is 72.6 m, and the total storage capacity is 121,000 m3, but these figures are based on the Okayama Prefecture reservoir database.

LocationKamimoribara, Kagamino-cho, Tomata-gun, Okayama
River NameYoshii River System Kamimori River
ObjectiveA (irrigation water)
ModelE(earth dam)
Bank height18.5m *
Bank length70m *
Dam volume36,000 m3
Watershed Area1.9 km2
Reservoir area2 ha
Total storage capacity181,000 m3 * 181,000 m3 * 181,000 m3 * 181,000 m3
Effective water storage capacity121,000 m3
Dam operatorKamimoribara District
Main body constructorDirectly managed by dam operator
Year of launch- year
Year Completed1943.
Name of Dam Lake-

Other facilities/observations

Parking lot×
Toilet×
Park×
PR Exhibition Hall×
Fishing×
Viewing platform×

Map around Gokurakuji Pond

Weather around Gokurakuji Pond

Accommodations that may be close to Gokurakuji Pond

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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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