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🏛 | Oso Dam Water leak again [Kumamoto]


Is it a water leak again at Oso Dam [Kumamoto]

If you write the contents roughly
According to the Kyushu Agricultural Administration Bureau, the amount of water infiltrated into the ground was settled at 1 tons per day in the "test flooding" that was carried out last year by storing water in the dam, but 2000 After the operation from the month, the permeation amount is 4 to 1 tons per day, which is much higher than expected.

The state-owned Oso Dam in Ubuyama Village, Aso District, which had been delayed due to water leaks, finally started full-scale operation in April this year ... → Continue reading

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Wikipedia related words

If there is no explanation, there is no corresponding item on Wikipedia.

Infiltration (hydrology)

HydrologyInPenetrationWhat is (Shinto, Infiltration)?soilToWedIt means that such things are infiltrated.Water (H2In addition to O), impurities contained in water also permeate at the same time.mainly(I.e.,snowSuch asprecipitationOriginated from, and after permeationgroundwaterBecomes

Strict definition of infiltration in soil science is that from above the soilgapTo the soilSolutionEnters and fills the gap at the top, eventually replacing the soil空 気Soil solution enters the lower soil while entering from the topeffect.

Penetration in the water cycle

Origin of permeating water

atmospherePrecipitation such as rain and snow originating from the water vapor inside causes water to fall on the ground.There is also water that falls by artificially watering and irrigating, but this is a river,Lake, Groundwater, etc.Both waterfreshwaterHowever, salty water may infiltrate near salt lakes, salt rivers, and the sea.

Liquid water soaks into the soil as it is.The water that didn't soak in immediatelypuddleWill remain in that place and slowly penetrate,evaporationdo itatmosphereReturn inside.If the water does not form in the puddle due to the influence of the terrain and flows to the lowland, or if the amount of water in the puddle is large, the water will flow on the surface of the earth, and this will eventually gather.riverBecomes

Solid water (snow and ice) remains on the soil and melts into water as the temperature rises, following a path similar to liquid water.Water that falls as a liquid may freeze on the soil and become a solid.

Water flow in the soil and outflow to the outside of the soil

Water that has soaked into the surface of the soil usually penetrates further into the lower layers.The amount and speed of permeation differ depending on the nature of the soil, and since there are many layers with different properties in the soil, the state of permeation differs depending on the soil.

Of the water retained in the soil, the surface layerplantSuch asBiology Absorbs a lot.Also, as it penetrates into the lower layers, water gathers like a river on the ground.Groundwater veinAnd gradually to the groundGushWill come.Since recorded historywellA route has also emerged that artificially discharges groundwater to the ground using such means.The time from the first infiltration to the gushing varies from hours to tens of thousands of years depending on the location.

Some water evaporates and returns to the atmosphere while being retained on the surface of the soil.

Penetration amount / penetration speed

as its name suggests,Penetration amount(Shintoryo, infiltration amount) is the amount of water that permeates the soil.Penetration rate(Shintosokudo, infiltration rate).

Penetration meter

Penetration meter(Shintokei, Infiltrometer) is a tool installed on the surface of soil to measure the amount of infiltration and the rate of infiltration.No complicated structure is required, so it can be measured with simple tools.First, a metal cylinder with a certain length that does not allow water to pass through is inserted into the soil with the surface exposed to the ground for several tens of centimeters, and a long ruler is fixed to the cylinder.Next, pour water into the cylinder and measure the amount of decrease in water height while measuring the time.

Simple calculation of permeation amount

The permeation amount F can be calculated by applying numerical values ​​to variables other than F based on the following hydrological balance formula.

F Is the amount of penetration.It can be specified by volume (capacity) or length.
Is the amount that flows into the target soil mass from other soils.
Is the amount that flows into other soil from the target soil mass.
P ThePrecipitation amount.
E Ha.
T Ha.
S Is the amount of water retained.
Is the amount of water that is excluded before it soaks into the soil, such as a puddle.
R Is the running water on the soil surface, etc.Surface runoff.

Evaporation amount and transpiration amount cannot be separatedEvapotranspirationIf only known, indicate evapotranspirationETUsing,TheReplace with.

Penetration and water retention

The ability of soil to penetrate waterPenetration(Shintoryoku), permeability, ability to retain water infiltrated by soilWater retentionIt is called (hosuiryoku) or water retention.

Of the soilparticleSize,ChemicalThe composition, the size and distribution of the gaps between particles, etc. determine the penetrating power and water retention power.


Related item

Kyushu Agricultural Administration Bureau

Kyushu Agricultural Administration Bureau(Kyushu no Useikyu) isKumamoto-shiIt is inMinistry of Agriculture OfLocal branch officeIt has jurisdiction over all prefectures in Kyushu.

Internal organization

  • Planning and adjustment room
  • General Affairs Department
    • Administration Division
    • Human Resources Department
    • Accounting department
    • Administration Division
    • Welfare Section
    • Information Promotion Division
  • Consumption and Safety Department
    • Consumer Affairs Division
    • Display / Standards Section
    • Safety Management Division
  • Production department
    • Production Promotion Division
    • Business management section
    • Horticulture Specialties Division
    • Livestock Division
    • Production Engineering Environment Division
  • Management / Business Support Department
    • Leader Development Division
    • Business Strategy Division
    • Management Support Division
    • Structural improvement section
  • Rural Planning Department
    • Rural Promotion Division
    • Land Improvement Management Division
    • Resources Division
    • Business Planning Division
  • Maintenance department
    • Design section
    • Site section
    • Water use maintenance section
    • Farmland Maintenance Division
    • Regional Development Division
    • Disaster prevention section
  • Statistics Department
    • Statistics Coordination Division
    • Statistics Planning Division
    • Management and Structural Statistics Division
    • Production Distribution Consumption Statistics Division


As of October 2015, 10, the regional bases were reorganized and changed from "regional center" to "prefectural base".

Offices in the jurisdiction


  1. ^ "50 years of history of the Regional Agricultural Administration Bureau". Local Agricultural Policy Bureau Directors' Meeting (April 25, 4) HandoutsMinistry of Agriculture, Forestry and Fisheries (April 2013). 2020/3/8Browse.
  2. ^ "A new prefectural base will be set up on October XNUMX, XNUMX." (PDF) (Press Release), Ministry of Agriculture, Forestry and Fisheries, Kyushu Regional Agricultural Administration Bureau, http://www.maff.go.jp/kyusyu/kumamoto/pdf/kumamoto271001-1.pdf 2016/12/4Browse. 
  3. ^ "A new prefectural base will be set up on October XNUMX, XNUMX." (PDF) (Press Release), Ministry of Agriculture, Forestry and Fisheries, Kyushu Regional Agricultural Administration Bureau, http://www.maff.go.jp/kyusyu/fukuoka/pdf/fukuoka271001-1.pdf 2016/12/4Browse. 
  4. ^ "A new prefectural base will be set up on October XNUMX, XNUMX." (PDF) (Press Release), Ministry of Agriculture, Forestry and Fisheries, Kyushu Regional Agricultural Administration Bureau, http://www.maff.go.jp/kyusyu/miyazaki/pdf/miyazaki271001-1.pdf 2016/12/4Browse. 

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