Shin Jinma

Planned high water flow rate

Planned high water flow rate indicates the river flow rate when flood control is carried out by a dam after the dam is constructed, compared to the base high water flow rate. In other words, the planned high water flow rate is the flow rate obtained by subtracting the amount of flood control by flood control facilities such as dams from the base high water flow rate. The water level at which the planned high water flow rate is displayed as a river channel cross section is called the planned high water level.

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

Planned composting capacity

The planned sediment capacity is the amount of sediment that is assumed to flow into a dam lake over a 100-year period. In Japan, where there are many mountains, more sediment than planned may flow into dam lakes due to the influence of the Median Tectonic Line and crustal movement such as earthquakes. The sediment problem is particularly serious in the Tenryu River system.

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

crest gate

A crest gate is a gate installed at the crest of a dam to prevent overflow from the top of the dam, mainly used for flood control as an emergency flood discharge. The word "crest" means "top" in English, and thus a "crest gate" is a gate located at the top of a dam.

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

catwalk

A catwalk is a narrow passageway installed downstream of the embankment wall, mainly in concrete dams, for work during the construction phase of the dam and for inspection after completion. They are especially seen in arch dams. As with the audit corridor, the general public is not allowed to enter the corridor, but it may be opened only for various events or when special permission is granted.

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

cable crane

A cable crane is a crane used in dam construction to transport materials and place concrete. Since they transport materials from the aggregate plant to the dam embankment, cables are usually stretched across the dam. Cable cranes themselves are not unique to dams, but those associated with dam construction are generally large, and sometimes only the crane foundations remain after the dam is completed.

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

reverse osmosis pond

Reverse control reservoirs exist at large hydroelectric power plants where the flow increases during the day and decreases at night. A "reverse control reservoir" is a dam that is also built downstream of a power plant to store water, and by releasing a certain amount of water, the flow downstream is regulated. Depending on the size of the dam, there are dams and weirs that serve as reverse control reservoirs.

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

base high-flow-rate

The base high water flow rate refers to the river flow rate (1/100 chance flow rate) at the time of a flood that is expected to occur once every 100 years (or once every 200 years) under the river conditions prior to dam construction. The term "Takamizu" is used to avoid mistakenly reading "Kozui" as "high water. The maximum value of this flow is the basis for flood control planning. When graphing, a graph called a "hydrograph" is created with time on the horizontal axis and flow rate on the vertical axis.

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

Foundation Ground

The foundation ground is the ground that supports the weight of the dam. In some dams, the foundation ground is quite deep. The embankment height, which expresses the height of the dam, is the height measured from the foundation ground to the top of the embankment. Therefore, some dams may actually appear lower than the embankment height.

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

corridor connecting an annex to a pond-side building (in traditional palatial-style architecture)

An audit corridor is a passageway used to check for damage inside the dam embankment. Normally, it is off-limits to all but authorized personnel. If permission is obtained, visitors may be allowed to take a special tour. However, if the dam is designated as a "dam open to the community," it may be used as a tour course, but in most cases it is a separate passage from the original audit corridor.

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

Temporary drainage tunnel

A temporary drainage tunnel is a kind of detour tunnel that is dug from upstream to downstream of a dam site during dam construction to divert overflowing upstream water downstream by damming the river. One of the temporary drainage channels. It is constructed to prevent overflow, to prevent the downstream river from becoming a waterless river, and to keep the construction site dry.

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

river law

The River Law is a current administrative law enacted in 1964 for the purpose of preventing floods and other disasters in Japan, maintaining normal functions, maintenance, conservation, and proper use of rivers. The Act defines and classifies rivers, and defines management facilities related to rivers.

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

orifice gate

An orifice gate is a discharge gate installed at a depth of less than 25 m below the full water level at any given time. It is mainly used to regulate the water level of the dam lake and the amount of water flowing downstream as flood control. It is sometimes used as a permanent flood discharge. Gates are often located near the middle or slightly above the middle of the embankment when viewed from downstream of the embankment.

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

left bank (of a river)

Left bank refers to the bank on the left side of a river, looking from upstream (upstream) to downstream (downstream). ⇔Ugan (right bank): In the old days, people living upstream watched boats bringing goods necessary for daily life from downstream, and this became an expression of the upstream viewpoint.

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

right bank (shore)

Right bank refers to the bank on the right side of a river, looking from upstream (upstream) to downstream (downstream). ⇔Left bank (sagan): In the old days, people living upstream watched boats bringing goods necessary for daily life from downstream, and this became an expression of the upstream viewpoint.

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

arch dam

The shape of the dam allows the water pressure from the dam lake to be dispersed to the bedrock on both sides of the embankment, thus making the embankment itself thinner and reducing construction costs. However, this type of dam is only suitable for construction on bedrock that can support a considerable amount of water pressure.

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

earth dam

A dam is made by layering soil as the material. Because it is relatively easy to construct, it is not suitable for large dams, but for small dams built in reservoirs. Most dams in Japan are of this type, but the exact number is unknown, including those with crest heights of 15 m or less. Historically, the Sayama Pond Dam in Osaka Prefecture is the oldest dam of this type in Japan.

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

RCD

RCD stands for "Roller Compacted Dam-concrete" and is an application of RCC (Roller Compacted Concrete), a construction method originally used for airport runway pavement in the U.S. and road pavement in Japan, to dams.

alphabetIntroduction to Damsdam terminology

CFRD

CFRD is an abbreviation for "Concrete Face Rockfill Dam." The literal translation is "Concrete Surface Barrier Rockfill Dam. The upstream face of a rockfill dam is covered with concrete to prevent water from seeping into the embankment. During the first decade or so after the war when this method was established, technical problems arose, such as unequal settlement and cracks.

alphabetIntroduction to Damsdam terminology

0500-Okutadami Dam

A huge dam located on the border between Niigata and Fukushima prefectures that served as the model for the movie "Whiteout" starring Yuji Oda. Okutadami Dam's total water storage capacity is the second largest in Japan, following Tokuyama Dam. It is also the fifth tallest gravity concrete dam in Japan in terms of both height and effective water storage capacity. It is a very dignified dam. And it is quite tall even when seen like this. / Gravity Concrete Dam / 157m

Niigata Prefecture Dam

1030-Narai Dam

This Nagano Prefecture-owned multi-purpose dam is located near Naraijuku on the Kiso Road in Shinshu. Until now, visitors from Nagoya had to exit at the Nakatsugawa Interchange on the Chuo Expressway and drive north on Route 19 or exit at the Shiojiri Interchange and drive south, but with the opening of the Gonpei Tunnel, it is now possible to exit at the Ina Interchange. / Rockfill dam / 60m

Nagano Prefecture Dam

1 … 24 25 26 … 33

Copied title and URL