Shin Jinma

1172-Higashi Fuji Dam

Higashi-Fuji Dam is located near Fuji Safari Park, and we actually stopped by after visiting the Safari Park. First of all, the double wire mesh fence prevents visitors from approaching the embankment. Unlike most dams, the entire perimeter of the dam lake is covered by the embankment, which is an asphalt-facing fill dam, an unusual feature of this dam. / Asphalt-facing fill dam / 22m

2010.08.13

Shizuoka Prefecture Dam

1126-Kawaura Dam/Kaore Dam

In many ways, I'm sorry if I got your hopes up! The Kawaura Dam is located upstream of the Kami-Osu Dam. The dam lake formed by the Kawaura Surabu Dam and this dam together is the upper regulating reservoir (upper pond), and the dam lake formed by the Kami-Osu Dam is the lower regulating reservoir (lower pond), and pumped storage power is generated between them. The effective drop-off is said to be as high as 486 meters.

2010.08.01

Dam in Gifu Prefecture

1137-Kawaura Anbu Dam / Gifu Prefecture

In many ways, I'm sorry if I got your hopes up! The Kawaura Kurambe Dam is located upstream of the Kami-Osu Dam. The dam lake formed by the Kawaura Dam and this dam together is the upper regulating reservoir (Upper Pond), and the dam lake formed by the Kami-Osu Dam is the lower regulating reservoir (Lower Pond), and pumped storage power is generated between them. The effective drop-off is said to be as high as 486 meters.

2010.08.01

Dam in Gifu Prefecture

Season for Familiarization with Forests and Lakes 2009 - Maruyama Dam

The 2009 event was held at Yokoyama Dam and Maruyama Dam. At the Maruyama Dam, visitors could not only tour the inside of the embankment, but also go up to the "Gate Pier" at the top of the embankment from the elevator on the first floor, and enjoy a panoramic view from there. Unfortunately, the weather was unfavorable on the day of the event, but due to the rain that had fallen the day before, it was a miraculous event to be able to see the powerful discharge of water from the dam.

2010.07.27

Off-line meeting/event report

Season for Familiarization with Forests and Lakes

The "Season for Familiarization with Forests and Lakes" began in 1987 and is a period (from July 21 to 31 every year) during which the Ministry of Land, Infrastructure, Transport and Tourism, the Forestry Agency, and the Japan Water Agency began educational activities to promote awareness of dams, dam lakes, water sources, and so on. During this period, various events are held at each dam.

2010.07.22

Introduction to Damsdam terminologyclassification for Japanese verb with the dictionary form ending in "mu

Season for Familiarization with Forests and Lakes 2009 - Yokoyama Dam

The "Season for Familiarization with Forests and Lakes" refers to the period (from July 21 to 31 every year) during which the Ministry of Land, Infrastructure, Transport and Tourism, the Forestry Agency, and the Japan Water Agency began to promote awareness of dams, dam lakes, and water sources. In 2009, however, dam enthusiasts from all over the country gathered for the event in particular. There is no reason not to go to this one. This article reports on a tour inside the dike of Yokoyama Dam.

2010.07.18

Off-line meeting/event report

2905-Kinjo Dam

The embankment is made of Ryukyu limestone, a material unique to Okinawa. It is the very wall of Shurijo Castle. It is said that the design of the river was inspired by the nearby Shuri Castle. The river is unusually narrow. The river is unusually narrow, so it has often been plagued by floods when it rains heavily. The river flows through the center of Naha City and Kokusai-dori Street, so you can see how important this dam is. / Gravity concrete dam / 19m

2010.06.01

Dam in Okinawa Prefecture

3147-Kinmu Dam (former name: Okkubi Dam)

The 100 million head dam is to be constructed 100 m downstream of the existing Kanabu Dam (non-dam/levee height 12.8 m). There was no sight of the embankment at all. Also, what I failed to capture was that I was heading toward Naha City, but I didn't know that Kinmu Dam was on the left side, and I was only staring at the right side of the bus, so I could only capture this sign.... / Trapezoidal CSG / 39m

2010.05.28

Dam in Okinawa Prefecture

3340-Kannawaki Dam

As the name suggests, the Hanna Waki Dam is located on the side of the Hanna Dam. I was actually aiming for the main body of the Hanna Dam, but when I noticed it, I saw the side dam.... I know that no one will be satisfied if I upload such a picture, but I wanted to upload it as a proof that I saw it.... / rockfill dam / 37m

2010.05.27

Dam in Okinawa Prefecture

0000-Ishikawa Dam

This dam, like Yamashiro Dam (2893-Yamashiro Dam/Yamashiro Dam), was photographed from the Okinawa Expressway during a tour of Okinawa. I was able to photograph it! However, it seems that the height of the embankment is less than 15m, and it is treated as a weir. So, it was not listed in the dam handbook... / 13.2m

2010.05.26

Dam in Okinawa Prefecture

2893-Yamashiro Dam

When I saw the characters for "Yamashiro Dam," I wondered if it was "Yamagusuku. I thought it might be "Yamagusuku," but it was a surprisingly common reading. Sometimes I get confused when I think that Okinawan kanji must be difficult to read, but it is not. I was surprised to learn that the dam was originally built by the U.S. Army. The history of the dam is typical of Okinawa. It was called Tengan Dam until March 1998. / Earth dam / 29.9m

2010.05.23

Dam in Okinawa Prefecture

fillet

A fillet is a reinforcing thickening section placed at the bottom of the upstream side of a dam embankment. They are installed when the strength of the concrete dam cannot be maintained or to ensure stability against overturning. They are installed in a triangular shape so that the upstream slope is slower.

2010.01.22

Introduction to Damsdam terminology"ha" column or row of the kana syllabary

dam tour

A dam tour is a visit to several dams. （It is (mainly) a term for dam enthusiasts. In most cases, you can reach several dams by going upstream on the main stream and tributaries of a river. The Oigawa and Tenryu Rivers in Shizuoka Prefecture have so many dams that they are called "dam heaven," and it may take a whole day to visit them, or even longer in some cases.

2010.01.18

"ta" column or row of the kana syllabaryIntroduction to Damsdam terminology

Surface water intake system

A surface intake facility is a facility that withdraws water from the surface where the water temperature is warmer than the lower levels. It has the advantage of not affecting crops and organisms. In addition, dams for power generation are sometimes installed to prevent turbid water. In some dams, aging surface intake facilities are replaced with selective intake facilities to improve reliability, operability, and maintenance management.

2010.01.16

Introduction to Damsdam terminology"ha" column or row of the kana syllabary

1332-Anno Dam

The first dam I picked up for my so-called first dam visit of 2010 was this Anno Dam, which I had been planning to visit since the end of the year. I had already researched that it is an irrigation dam for agriculture, so I thought it would not be flashy, but there is no denying that it is a magnificent dam. / Gravity concrete dam / 73m

2010.01.15

Dam in Mie Prefecture

emergency flood discharge

An emergency flood discharge is a gate that prevents overflow of a dam during a flood. It is used in the event of a flood that is too large to be discharged by the normal flood discharge. In most cases, the emergency flood discharge is located near the top of the embankment.

2010.01.13

Introduction to Damsdam terminology"ha" column or row of the kana syllabary

1465-Tachigahata Dam

After visiting Ishii Dam, we headed to Tachigahata Dam. However, I was very impressed that the interesting properties were scattered around before we reached the embankment, and the embankment was not the only thing to see. The stone-lined dam was clearly distinct from the concrete dams we had seen before. I am sure that the people of the Meiji period must have seen a landscape not much different from this picture. / Gravity concrete dam / 33.3m

2010.01.11

Hyogo Prefecture Dam

non-flood season

The non-flood season refers mainly to the winter months, when precipitation is low. This means that the water level of the dam lake is higher. The period varies from dam to dam and is set in detail. ⇔Flood season

2010.01.05

Introduction to Damsdam terminology"ha" column or row of the kana syllabary

weir

A weir is a structure built across a river. Under the River Act, a dam is defined as a structure that is 15 meters or longer, while a weir is generally defined as a structure that is shorter than 15 meters. Sometimes it is simply called a weir. There are two types of weirs: fixed weirs, which have no moving parts, and movable weirs, which have moving parts to control the flow of water. In addition, there are wash weirs that allow water to overflow the top of the weir.

2010.01.03

"a" column or row of the kana syllabaryIntroduction to Damsdam terminology

buttress dam

Buttress dams, also known as "support-wall dams," are dams that use concrete walls for support. There are only six such dams in Japan, and the Mitaki Dam (Tottori Prefecture), completed in 1937, was the last buttress dam in Japan. Because cement was an expensive material before World War II, buttress dams, which require less cement than gravity-type concrete dams, attracted attention and were constructed. However, as cement became less expensive, it was difficult to find engineers to work on the formwork, maintenance was not easy and costly, and there were durability problems.

2009.12.22

Introduction to Damsdam terminology"ha" column or row of the kana syllabary

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