WO2020229887A1 - Procédé et système de commande automatique de niveau d'eau du sol - Google Patents

Procédé et système de commande automatique de niveau d'eau du sol Download PDF

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Publication number
WO2020229887A1
WO2020229887A1 PCT/IB2019/058376 IB2019058376W WO2020229887A1 WO 2020229887 A1 WO2020229887 A1 WO 2020229887A1 IB 2019058376 W IB2019058376 W IB 2019058376W WO 2020229887 A1 WO2020229887 A1 WO 2020229887A1
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WO
WIPO (PCT)
Prior art keywords
valve
well
water level
float
level control
Prior art date
Application number
PCT/IB2019/058376
Other languages
English (en)
Inventor
Andrius MARINAS
Original Assignee
Uab Ekodrena
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uab Ekodrena filed Critical Uab Ekodrena
Priority to EP19804829.0A priority Critical patent/EP3969668A1/fr
Publication of WO2020229887A1 publication Critical patent/WO2020229887A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B11/00—Drainage of soil, e.g. for agricultural purposes

Definitions

  • the invention relates to the field of the soil water level control by drainage pipes, and, in particular, a system with devices which control the soil water level by means of a float valve and a drainage well with separators.
  • the invention provides a soil water level control method and a system implementing the method wherein the soil water level can be controlled automatically or manually using existing or newly constructed drainage pipes or tubes.
  • Document CN103953007 (published on 30 July 2014) provides a technical solution wherein the soil water level is controlled mechanically.
  • the document describes a drainage system comprising drainage pipes and a device having a valve that can close or open the water flow.
  • the valve opens due to the accumulated water pressure.
  • the larger water content builds up more pressure, therefore the valve opens more widely and more water flows through.
  • the soil water level is controlled automatically.
  • a disadvantage of the invention is that it is not possible to drain the soil water manually quickly, therefore the soil water level control is partial. When the vertical drainage wells are high, the soil is unstable, the frost affects the well, the well stability problem occurs.
  • Patents CA2466976C (published on 1 1 September 2007) and US8342775 (published on 1 January 2013) describe the drainage systems that are automatically controlled by a controller.
  • the water flow is controlled according to a predetermined date, taking into account the recurring climatic conditions every year.
  • the problem is that the system is inflexible, when the water content passing through the soil is controlled by a predetermined date: the climate conditions and the humidity content can vary widely in different years.
  • the automatically controlled drainage systems have the following disadvantages: they also become leaky after prolonged use due to the soil plaque or changes in pipe geometry.
  • Patent CN208110359 (published on 16 November 2018) provides a technical solution wherein the drainage controller can receive signals from the environment: temperature, water level or other parameters are measured. The controller electronically controls the drainage system according to the data received by closing or opening the water flow valve.
  • Document US2010276015 (published on 4 November 2010) describes a drainage system comprising horizontal drainage pipes and vertical wells. The water level in the wells is controlled by the plates placed in the wells, the amount of which can be changed. The water flow in the horizontal drainage pipes is controlled automatically by a floating mechanism according to the pressure into the drainage pipe valves.
  • the invention provides an automatic soil water level control system, which has drainage pipes, a water level control well and a float valve.
  • the well has the following components: a housing of the well, a bottom, a cover, a side profile and a separator.
  • the float valve has the following components: a housing of the float valve, a rear cover, a front plate, a mounting plate, a rear lever, a front lever, a float, a valve, a hinge, fasteners, a valve gasket, a valve opening to remove the air, a plate.
  • the separators placed in the well control the water level in the soil since the water level in the soil and the well is the same.
  • the water raises the float upward and the rising float closes the valve.
  • the water rises in the area in front of the float valve.
  • the water opens the valve due to the pressure, some water is drained towards the well.
  • Each float valve raises the water level in the soil area in front of the float valve.
  • Fig. 1 shows a schematic diagram of the water level control well.
  • Flere 1 - the water level control well, 1.1 - the housing of the well, 1.1.1 - the well connection pipe: inlet, 1.1.2 - the well connection pipe: outflow, 1.2 - the bottom, 1.3 - the cover, 1.4 - the separator, 1.5 - the side profile.
  • Fig. 2 shows a schematic diagram of the separator.
  • Flere 1.4 - the separator, 1.4.1 - the separator gasket, 1.4.2 - the separator hook, 1.4.3 - the screwed plate ensuring tightness of the separator gasket.
  • Fig. 3 shows a cross sectional view of the side profile. Flere 1.5 - the side profile.
  • Fig, 4 shows a schematic diagram of the float valve.
  • Flere 2 - the float valve, 2.1 - the housing of the float valve, 2.2 - the rear cover, 2.3 - the front plate, 2.4 - the mounting plate, 2.5 - the rear lever, 2.6 - the front lever, 2.7 - the float, 2.8 - the valve, 2.9 - the hinge, 2.10 - fasteners, 2.1 1 - the valve gasket, 2.12 - the valve hole to remove the air.
  • Fig. 5 shows the front plate of the float valve. Flere 2.3 - the front plate, 2.13 - the screwed plate ensuring tightness of the valve gasket.
  • Fig. 6 shows a schematic diagram of the float valve, an alternative.
  • the soil water level control systems have disadvantages: the drainage well is not environmentally resistant, when the vertical drainage wells are long in height, the soil is unstable, the frost affects the well, and a well stability problem occurs. After a while, the separators lose their tightness, and the float valve does not close tightly due to plaque, its rubber parts, which are not mechanically fastened with plates or screws, can tear or become loose. Also, many systems cannot be manually controlled.
  • the description provides an automatic soil water level control system, which addresses the above- mentioned disadvantages.
  • the soil water level control system comprises the drainage pipes, the water level control well and the float valve.
  • the drainage pipes are connected to the well, and the float valve is inserted between the drainage pipes in the soil area where the relief rises, i.e. where the soil water level needs to be raised.
  • the float valves installed in the drainage pipe system automatically control the water flow through the drainage pipes. Improvements increase the efficiency and durability of the soil water control system. There is a water level control well that is more stable and resistant to environmental impact. The description also provides an improvement to the float valve, since structural elements of the float valve prevent plaque formation, and thus solve the problem of tightness of the valve. Additionally, improvements to separators address the problem of tightness in the water level control well.
  • the automatic soil water level control system described in the invention has the following interconnected parts:
  • the drainage pipes are ordinary pipes used in the drainage system to remove excess water from the soil.
  • the drainage pipes are hollow elements that can be made of various materials, usually they are ceramic or plastic.
  • the drainage pipes are buried in the soil where they lie horizontally or sloping.
  • the drainage pipes are connected into a single drainage system in such a way that they form a slope, so that excess soil water is discharged into the lowest reclamation ditch or other place where the water is removed.
  • the ceramic drainage pipes are not tightly pressed to each other in the drainage system, so that the soil water passes through the cracks between the pipes into the drainage pipes.
  • the plastic drainage pipes are corrugated and have holes through which water enters the pipe and drains into the reclamation ditch.
  • the described automatic soil water level control system may be adapted to existing drainage pipes or new drainage pipes may be laid.
  • the water level control well (1 ) (hereinafter “the well”) has the following components (Fig. 1 ):
  • the housing of the well (1.1 ) has a cylindrical shape which has a circular cross- section, a tube placed vertically into the soil.
  • the housing of the well (1.1 ) can be made of a variety of materials (plastic, metal, wood, fiberglass and other natural or synthetic materials), and the housing of the well, made of PVC is usually used.
  • the housing of the well (1.1 ) must be leak-proof and durable. An important feature of the housing of the well is that the housing of the well (1.1 ) has a cylindrical shape and therefore it is resistant to environmental impact: it does not distort or lose tightness due to moisture, cold, mechanical or other influences.
  • the water outlet hole or outlet pipe (1.1.2) through which the soil water is removed from the well (1 ) may be open, or the drainage pipe or drainage outlet may be connected to the water outlet hole (1.1.2).
  • the separators (1.4) inserted between the water inlet hole (1.1.1 ) and the water outlet hole
  • the separators (1.4) are placed vertically in such a way that the well (1 ) has two tanks and the soil water that enters the well (1.1.1 ) is not removed but it accumulates.
  • the housing of the well (1.1 ) has a bottom (1.2) at the bottom and a cover (1.3) at the top.
  • the top of the housing of the well (1.1 ) may have a lock so that the well (1 ) can be locked.
  • the bottom (1.2) of the well is a part of the housing of the well (1.1 ) at the bottom integrated into the housing (1.1 ) of the well, which closes tightly the housing (1.1 ) of the well from the bottom.
  • the top of the bottom (1.2) is inserted into the housing (1.1 ) of the well so the diameter and shape of this section must be adapted to the diameter and shape of the housing of the well (1.1 ).
  • the bottom part of the bottom (1.2) has a diameter that is larger than the diameter of the housing (1.1 ) of the well, so that the bottom provides stability for the well.
  • the bottom (1.2) can be made of various materials (plastic, metal, wood, fiberglass and other natural or synthetic materials), usually the bottom (1.2) made of PVC is used.
  • the bottom (1.1 ) of the well is fastened to the housing (1.1 ) of the well by means of metal angles, the angles can be fastened both on the outside and on the inside of the housing (1.1 ) of the well.
  • the cover (1.3) of the well is the part at the top of the housing (1.1 ) of the well that covers the housing (1.1 ) of the well.
  • the diameter and shape of the cover (1.3) must be adapted to the housing (1.1 ) of the well.
  • the cover (1.3) can be made of various materials (plastic, metal, wood, fiberglass and other natural or synthetic materials), most often the cover (1.3) made of PVC is used.
  • the cover (1.3) is not integrated into the housing (1.1 ) of the well: the cover (1.3) can be raised and lowered.
  • the cover (1.3) has a hook and a lock, the other part of the lock is on the housing of the well (1.1 ), so the well (1 ) can be locked. In some cases, the cover (1.3) may not have a hook (1.4.2) and / or a lock.
  • the separator (1.4) of the well is a plate-shaped part of the well (1 ) inserted between the side profiles (1.5) and capable of moving up / down (Fig. 2).
  • the separator (1.4) can be made of various materials (plastic, metal, wood, fiberglass and other natural or synthetic materials), most often the separator (1.4) made of PVC is used.
  • the dimensions of the separator (1.4) must be compatible with those of the housing (1.1 ) of the well and the side profile (1.5).
  • the separator (1.4) must be durable to withstand the forces exerted by the water pressure and the environment and impermeable to water.
  • the separator (1.4) is tightly inserted into the opposite side profiles (1.5).
  • the ends of the separator which are inserted into the side profile (1.5), are thinner than the rest part of the separator (1.4). In some cases, the ends of the separator (1.6) may have the same thickness as the separator (1 .4) itself.
  • the separator (1.4) can be fastened to the side profile (1.5) in other ways that ensure tightness.
  • the separator (1.4) has one or more hooks (1.4.2) that allow the separator to be inserted and raised from the well (1 ).
  • the gasket may be made of a variety of materials, the most commonly porous EPDM rubber (1.4.1 ) is used.
  • the gasket (1.4.1 ) is glued across the entire circumference of the separator (1.4) and fastened by the plate (1.4.3).
  • a single gasket (1.4.1 ) is usually used, but it is also possible to glue separate gasket strips to the sides of the separator (1.4). In some cases, the gasket (1.4.1 ) can cover the entire surface of the separator (1.4).
  • the gasket (1.6.1 ) is usually slightly overhanging the separator
  • gasket (1.4.1 ) may overlap the separator (1.4).
  • the plate can be made of different materials, but PVC or steel is the most common.
  • the separator (1.4) and the plates have overlapping holes, therefore the separator (1.4) and the plate are tightened by means of bolts, nuts, washers. In some cases, the gasket
  • the lower separator (1.4) is fixed, i.e. it is fixed and tightly fastened to the side profiles (1.5) and the bottom (1.2).
  • the lower separator (1.4) is inserted vertically into the housing of the well (1.1 ) in such a way that the housing of the well (1.1 ) is separated into two tanks in which the water does not mix. In some cases, the lower separator (1.4) can be removed.
  • the other separators (1.4) are tightly placed on the top of each other by inserting them into the side profiles (1.5).
  • the separators (1.4) separate the housing of the well (1.1 ) into two parts in such a way that two water tanks are formed in the housing of the well (1.1 ) where the water does not mix.
  • the side profile of the well (1.5) is an elongated part which is fastened to the walls of the housing of the well (1.1 ) which has such shape that one side can be fitted tightly into the housing of the well (1.1 ) and on the other side there is a cavity where the separator (1.4) can be tightly inserted (Figure 3).
  • the side profile (1.5) can be made of various materials (plastic, metal, wood, fiberglass and other natural or synthetic materials), but the aluminium side profile (1.5) is most commonly used.
  • the housing (1.1 ) of the well (1.1 ) has two opposite side profiles (1.5).
  • the side profile in the lower part may be sealed by a plate of the shape of an inner part of the profile which may be made of various materials (plastic, metal, wood, fiberglass and other natural or synthetic materials) but most commonly the PVC material is used to prevent water from accumulating inside the profile.
  • holes may be made in order to remove water from the profile, otherwise the profiles may be broken during the frost if the water may accumulate inside the profile.
  • the float valve has the following components (Fig. 4):
  • the housing (2.1 ) of the float valve is the part of the float valve where the other parts of the float valve are placed.
  • the housing of the float valve (2.1 ) can be made of various materials (plastic, metal, wood, fiberglass and other natural or synthetic materials), usually made of PVC.
  • the top part of the housing (2.1 ) of the float valve has a hole or holes (2.12) through which the air is removed from the housing (2.1 ) of the float valve.
  • the holes shall be covered with geotextile or other cloth which prevents the soil from entering the housing (2.1 ) of the float valve. Both ends of the housing of the float valve (2.1 ) are covered by the rear cover (2.2).
  • the rear cover (2.2) is the part of the float valve (2) which covers the ends of the housing (2.1 ) of the float valve.
  • the diameter and shape of the rear cover (2.2) must be identical to the diameter and shape of the housing (2.1 ) of the float valve.
  • the rear cover (2.2) has a hole through which it is connected to a drainage pipe or PVC pipe.
  • the rear cover (1.4) can be made of a variety of materials, most often PVC is used.
  • the rear cover (1.4) connects the float valve on both sides with the drainage pipe or PVC pipe and prevents the soil from entering the housing of the float valve (2.1 ).
  • the front plate (2.3) is a part of the float valve (2), which fits tightly into the housing of the float valve (2.1 ) (Fig. 5).
  • the front plate (2.3) must have the same shape and diameter as the housing of the float valve (2.1 ).
  • the front panel (2.3) can be made of various materials, usually made of PVC.
  • the front plate (2.3) has a hole that can be closed or opened by the valve. There is a gasket (2.11 ) around the hole, which is needed to seal the hole in the valve (2.8), and the gasket is glued and fastened by plates (2.13).
  • the gasket can be made of various materials, most often a rubber gasket is used.
  • the front plate (2.3) has a threshold - the hole is risen above the edge of the front plate (2.3).
  • the part of the front plate (2.3) located between the edge of the front plate (2.3) and the hole may have a slope.
  • the thresholds and slopes are needed to prevent plaque formation at the bottom of the front panel (2.3) and to close tightly the hole in the valve (2.8).
  • a rubber or other resilient material (2.1 1 ) is provided around the hole in the front plate (2.3) and is risen around the hole in the front plate (2.3) (Fig. 6). This shape of rubber also prevents plaque formation at the bottom of the front plate (2.3) and the valve (2.8) covers tightly the hole.
  • the mounting plate (2.4) is the part of the float valve (2) which is mounted on the inside of the housing of the float valve (2.1 ) at the top.
  • the mounting plate (2.4) comprises the parts of the float valve (2) that control the movement of the float (2.7) and the valve (2.8).
  • the mounting plate (2.4) can be made of different materials, the most commonly the mounting plate made of PVC (2.4) is used.
  • the rear lever (2.5) is the part of the float valve (2) fixed to the mounting plate (2.4). One end of the rear lever (2.5) is connected to the mounting plate (2.4) and the other end to the front lever (2.6). Both joints are flexible, therefore the rear lever (2.5) can move up and down.
  • the rear lever (2.5) can be made of a variety of materials, the most common the rear lever (2.5) of PVC is used.
  • the front lever (2.6) is the part of the float valve (2) with one end fastened to the rear lever (2.5) and the other end to the valve (2.8).
  • the front lever (2.6) is flexibly connected to the rear lever (2.5), allowing the front lever (2.6) to move upward, thereby moving the front lever (2.6) to open the valve (2.8) that opens or closes the hole in the front panel (2.6).
  • the front lever (2.6) can be made of various materials, usually made of PVC.
  • the float (2.7) is the lighter-than-water part of the float valve (2), which is fastened to the rear lever (2.5) and the front lever (2.6).
  • the float (2.7) can be made of a variety of materials that are lighter than water, the most commonly a float made of non absorbent foam (2.7) is used.
  • the soil water raises or lowers the float (2.7).
  • the float (2.7) moves the front lever (2.6) connected to the valve (2.8), which opens or closes the hole in the front panel (2.3).
  • the valve (2.8) closes the hole in the front panel (2.3); when the float (2.7) is lowered, the valve (2.8) opens the hole in the front panel (2.3).
  • the valve (2.8) is the part of the float valve (2) fastened to the front lever (2.6) and the hinge (2.9).
  • the valve (2.8) can be made of a variety of materials, the most commonly the valve (2.8) made of PVC is used.
  • the valve (2.8) controls the flow of the soil water through the float valve (2) and drainage pipes by closing or opening the hole in the front plate (2.3). When the valve (2.8) is lowered, it presses against the gasket (2.1 1 ), tightly covers the hole and prevents the soil water. When the hole is uncovered, the soil water flows through it.
  • the fasteners (2.10) are elements that connect or fasten parts of the float valve (2) together.
  • the fasteners (2.10) are usual elements used in plumbing to connect or fasten items: a bolt, a nut, a washer, a screw, a nozzle and so on.
  • the soil water level is controlled automatically and manually.
  • the automatic soil water level control system comprises drainage pipes and a well (1 ).
  • the drainage pipes are connected to a single system and lie slightly on the soil.
  • At the lowest point of the relief there is a well (1 ) to which the drainage pipe system is connected.
  • the well (1 ) has a drainage hole or connection pipe (1.1.2) through which the soil water flows from the well (1 ) into the drainage ditch or elsewhere.
  • the lower separator (1.5) is only in the well (1 )
  • the amount of water entering the well (1 ) through the water inlet or connection pipe (1.1.1 ) is immediately discharged through the water outlet or connection pipe (1.1.2).
  • the separators (1.4) may be manually inserted into the well (1 ).
  • the separators (1.4) are put tightly on top of each other, no water can pass.
  • the separators (1.4) are added to the well (1 )
  • the soil water flowing through the drainage pipes will accumulate in the well (1 ).
  • the water level rises on the side of the housing (1.1 ) where there is a water inlet or connection pipe (1.1.1 ).
  • the soil water reaches the top of the upper separator (1.4)
  • the water flows through the top of the upper separator (1.4), enters the side of the housing (1.1 ) where the water outlet hole (1.1.2) is located and is removed. Water below the top of the upper separator (1.4) is not removed from the well (1 ).
  • the soil water in the well (1 ) and the soil are like communicating vessels, the water is not removed from the soil either.
  • the soil water is maintained at the height of the top of the upper separator (1.4).
  • the water level in the soil can be controlled by changing the amount of separators (1.4) in the well (1 ).
  • a part of the separators (1.4) can be removed manually to lower the soil water level for a short time.
  • the separators (1.4) are added manually and the soil water level is raised.
  • the soil water level can be controlled in other cases as well. For example, when some of the separators (1.4) are removed after a heavy rainfall, excess water can be quickly drained. When the separators (1.4) are inserted, the soil water level is raised again.
  • the float valve (2) is used in addition to the drainage pipes and well.
  • the drainage pipes are connected to the well (1 ) as described above.
  • the soil water level in the relief area where the relief rises, the soil water level also needs to be raised. Therefore, the float valve (2) is normally placed on the drain collector at this point.
  • the float valve (2) When there is no water in the well (1 ), the float valve (2) is opened, all water flows through the float valve (2). When the water appears in the soil, it passes through the drainage pipes and the float valve (2) to the well (1 ). In the well (1 ), the soil water accumulates, rises and maintains the soil water level at the height of the upper edge of the upper separator (1.4) of the well. The soil water also accumulates in the drainage pipes, and thus in the float valve (2), until it reaches the float (2.7). The float (2.7) rises and closes the valve (2.8). When the float (2.7) is fully risen, the valve (2.8) is also fully closed.
  • the float valve (2) closes the soil water flow through the drainage pipes, therefore the soil water level is different in front of and behind the float valve (2).
  • the soil water level is higher because the water is not removed by drainage pipes.
  • the float valve (2) raises the soil water level in the drainage system.
  • the soil water level is raised to the set height, the water accumulated builds up pressure before the float valve (2), causing the valve (2.8) to open and some of the water to drain into the well, where it is removed (1 ).
  • the valve (2.8) is closed.
  • the float valve (2) is so designed that there is a balance between the water pressure in the soil before the float valve (2) and the lifting capacity of the float (2.7). By increasing the lifting capacity of the float (2.7), the water level in the soil before the float valve (2) will increase accordingly. Thus, the valve (2.8) is opened or closed by two forces acting in opposite directions, and when they converge, a corresponding rise in the soil water level is maintained in front of the float valve (2). The higher soil water level upstream of the float valve (2) does not adhere exactly to the float valve (2), some of the water flows above the float valve (2). Therefore, several float valves (2) are required to raise the soil water level significantly in the drainage system, depending on the difference in heights of the relief.
  • the automatic soil water level control method has the following steps:
  • the automatic soil water level control system has drainage pipes and the water level control well (1 ).
  • the automatic soil water level control system has drainage pipes, the water level control well (1 ) and the float valve (2).
  • the number of float valves (2) depends on the soil relief: the greater the differences in height, the more the system will need float valves (2) to maintain the soil water level in the area of the root of the plant.
  • drainage pipes, the well (1 ) and float valves (2) allow water to remain in the soil in the area of roots of the plant during the dry season and, after rainfall or otherwise, excess water can be quickly drained.
  • the soil water level is controlled both automatically and manually by removing or adding separators (1.4).
  • the automatic soil water level control system comprises drainage pipes, a well (1 ) and float valves (2).
  • the number of float valves (2) depends on the soil relief. If there is a 90 cm difference in height in the drainage system, 3 float valves (2) should be installed, each rising by 30 cm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Sewage (AREA)
  • Float Valves (AREA)

Abstract

La présente invention concerne un système de commande automatique de niveau d'eau du sol, qui comprend des tuyaux de drainage, un puits de commande de niveau d'eau et une soupape à flotteur. Le puits comprend les composants suivants : un boîtier du puits, un fond, un couvercle, un profil latéral et un séparateur. La soupape à flotteur comprend les composants suivants : un boîtier de la soupape à flotteur, un couvercle arrière, une plaque avant, une plaque de montage, un levier arrière, un levier avant, un flotteur, une soupape, une charnière, des éléments de fixation, un joint de soupape, une ouverture de soupape pour éliminer l'air, une plaque. Lorsqu'il n'y a pas d'eau dans le puits, la soupape à flotteur est ouverte et l'eau s'écoule à travers les tuyaux de drainage et la soupape à flotteur dans le puits. Les séparateurs dans le puits commandent le niveau d'eau dans le sol puisque le niveau d'eau dans le sol et le puits est identique. L'eau soulève le flotteur vers le haut et, en montant, le flotteur ferme la soupape. L'eau monte dans la zone devant la soupape à flotteur. Lorsqu'une quantité importante d'eau s'accumule, l'eau ouvre la soupape du fait de la pression et une partie de l'eau s'écoule vers le puits. Un équilibre s'établit. De cette manière, le système commande le niveau d'eau du sol lorsque le relief est accidenté. Chaque soupape à flotteur élève le niveau d'eau dans la zone de sol devant la soupape à flotteur.
PCT/IB2019/058376 2019-05-15 2019-10-02 Procédé et système de commande automatique de niveau d'eau du sol WO2020229887A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19804829.0A EP3969668A1 (fr) 2019-05-15 2019-10-02 Procédé et système de commande automatique de niveau d'eau du sol

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Application Number Priority Date Filing Date Title
LT2019514A LT6790B (lt) 2019-05-15 2019-05-15 Dirvožemio vandens lygio automatinis reguliavimo būdas ir sistema
LTLT2019514 2019-05-15

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WO2020229887A1 true WO2020229887A1 (fr) 2020-11-19

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LT (1) LT6790B (fr)
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Cited By (1)

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