Circulating irrigation and drainage facility for irrigation and water conservancy

Abstract

The invention relates to a farmland water conservancy circulation irrigation and drainage facility which comprises a water well and a controller and further comprises an underground pipe network and a plurality of irrigation row piles, a water pump electrically connected with the controller is connected between the water well and the underground pipe network, and the underground pipe network is buried below a farmland cultivation layer. The irrigation and drainage pile comprises an irrigation pile and a drainage pile, the lower ends of the side walls of the irrigation pile and the drainage pile are communicated with each other, an electric control valve electrically connected with the controller is arranged between the irrigation pile and the drainage pile, the lower end of the irrigation pile is communicated with an underground pipe network, the upper end of the irrigation pile extends to the position above a farmland cultivation layer, and the upper end of the drainage pile is located at the ground surface position; according to the system, surface water and rainfall are converged to the water well, waterlogging is prevented, a flocculating agent is added into the water body to purify the water body, irrigation water is formed after purification, adverse effects of impurities such as suspended solids, particles and microorganisms in the water on crops are avoided, and growth of the crops is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy facilities, and in particular to a farmland water conservancy circulation irrigation and drainage facility. Background Art

[0002] Farmland water conservancy is a comprehensive science and technology that develops irrigation and drainage, regulates regional water conditions, improves the moisture conditions of farmland, prevents and controls drought, waterlogging, salt and alkali disasters, and promotes stable and high agricultural production. Farmland water conservancy is generally called irrigation and drainage abroad. Farmland water conservancy involves hydraulics, civil engineering, agronomy, soil science, as well as hydrology, meteorology, hydrogeology and agricultural economy. Its task is to intercept, regulate, distribute and use agricultural water resources through engineering and technical measures, and to improve soil and fertilize in combination with agricultural technical measures, expand land use, so as to achieve the goal of high and stable agricultural production. By building and using various water conservancy engineering measures, the moisture conditions of farmland and regional water conservancy conditions can be regulated and improved, the ability to resist natural disasters can be improved, and the virtuous cycle of the ecological environment can be promoted, so as to be conducive to the production of crops.

[0003] Farmland water conservancy is closely related to agricultural development. The success or failure of agricultural production is largely determined by the rise and fall of farmland water conservancy. Farmland water conservancy circulation irrigation and drainage facilities are key facilities to ensure the rational use of farmland water resources and the good growth of crops. Farmland water conservancy circulation irrigation and drainage facilities, in simple terms, are a set of comprehensive facilities that can achieve the rational distribution, utilization and circulation of water resources in farmland. It includes multiple links such as the introduction of water sources, the layout of irrigation channels, the setting of drainage facilities, and the recycling and reuse of water resources. The water source can be a natural water body such as a river, lake, and reservoir, or it can be groundwater. In the process of introducing water sources, the problem of water quality also needs to be considered. Water quality is directly related to the quality and yield of crop growth. However, traditional circulation irrigation and drainage facilities use natural water bodies for irrigation, and natural water bodies often contain impurities such as suspended matter, particulate matter, and microorganisms. These impurities will have adverse effects on crops. Therefore, it is urgent to design a farmland water conservancy circulation irrigation and drainage facility to solve the problems in the prior art. Summary of the invention

[0004] The embodiment of the present invention provides a farmland water circulation irrigation and drainage facility, which can solve the problem in the prior art that natural water bodies often contain impurities such as suspended matter, particulate matter, and microorganisms, and these impurities may have adverse effects on crops.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a farmland water conservancy circulation irrigation and drainage facility, including a water well and a controller, and also including an underground pipe network and a plurality of irrigation and drainage piles, a water pump electrically connected to the controller is connected between the water well and the underground pipe network, the underground pipe network is buried below the farmland cultivation layer, the irrigation and drainage piles include irrigation piles and drainage piles interconnected at the lower ends of the side walls, an electric control valve electrically connected to the controller is arranged between the irrigation piles and the drainage piles, the lower end of the irrigation pile is connected to the underground pipe network, the upper end of the irrigation pile extends above the farmland cultivation layer, and the upper end of the drainage pile is at the surface position;

[0006] A water wheel shell connected to an underground pipe network is arranged inside the water well, a vertical rotating shaft penetrating the water wheel shell is rotatably connected to the upper wall of the water well, water wheel blades located inside the water wheel shell are arranged on the vertical rotating shaft, a driving bevel gear is arranged at the upper end of the vertical rotating shaft, a storage hopper for storing flocculants is arranged at the upper end of the water well, a horizontal rotating shaft is rotatably connected inside the storage hopper, a plurality of unloading plates are arranged in a circular array on the horizontal rotating shaft, and a driven bevel gear meshing with the driving bevel gear is coaxially arranged on the horizontal rotating shaft.

[0007] Preferably, the irrigation pile and the drainage pile are both hollow structures, a connection port is provided on the upper portion of the irrigation pile, and a water inlet hole is arranged on the surface of the drainage pile.

[0008] Preferably, a stirring blade is provided on the vertical rotating shaft.

[0009] Preferably, the vertical rotating shaft includes an upper rotating shaft and a lower rotating shaft, a blind hole is provided at the lower end of the upper rotating shaft, a spline groove is provided on the inner side wall of the blind hole, a spline matching the spline groove is provided on the upper part of the lower rotating shaft, a cylinder is provided on the inner bottom wall of the water well, a closed slide is provided on the inner wall of the cylinder, a sliding block matching the closed slide is provided at the lower end edge of the lower rotating shaft, and the stirring blade is provided on the lower rotating shaft.

[0010] Preferably, guide grooves are provided on both sides of each of the blanking plates, a guide block is slidably connected inside the guide groove, an arc sleeve is provided on the guide block, an arc plate is slidably connected between two opposite arc sleeves, a first elastic member is provided between the two ends of the arc plate and the two arc sleeves, and a telescopic device electrically connected to the controller is provided between the horizontal rotating shaft and the arc plate.

[0011] Preferably, the connection between the underground pipe network and the water wheel housing has a necked portion.

[0012] Preferably, a limit ring is provided inside the irrigation pile, a second elastic member is provided on the inner top wall of the irrigation pile, and a sealing block that fits with the inner wall of the irrigation pile is provided at the lower end of the second elastic member.

[0013] Preferably, a mineral filter material layer and a coarse aggregate material layer are sequentially arranged on the outer side of the drainage pile.

[0014] Preferably, a sludge pump is provided at the surface, and one end of the sludge pump extends into the inner bottom of the well.

[0015] Compared with the prior art, the present invention is equipped with a water well, a controller, an underground pipe network, a water pump, an irrigation pile, a drainage pile, an electric control valve, a water wheel housing, a vertical shaft, a water wheel blade, an active bevel gear, a storage hopper, a horizontal shaft, a feed plate and a driven bevel gear. When it rains or the surface water content is too high, the electric control valve is opened, and the rainfall or surface water will enter the underground pipe network through each drainage pile, and then flow through the water wheel housing and converge into the water well to prevent waterlogging. The water flow impacts the water wheel blade in the water wheel housing to make it rotate, and the water wheel blade drives the active bevel gear to rotate through the vertical shaft. The movable bevel gear drives the horizontal shaft to rotate through the driven bevel gear, and the horizontal shaft drives the feed plate to rotate, so that the flocculant in the storage hopper evenly falls into the well and mixes with the water entering the well, so that the suspended matter, particulate matter, microorganisms and other impurities in the water are settled at the bottom of the well. During irrigation, the electric control valve is closed, and drip irrigation pipes or sprinkler irrigation pipes are connected to each drainage pile. The purified water is pumped by a water pump and transported to each drainage pile through the underground pipe network. The drainage piles irrigate the farmland through the external drip irrigation pipes or sprinkler irrigation pipes. The drainage and irrigation are integrated, the water impurity removal effect is good, and it is beneficial to the growth of crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the main cross-sectional structure of the water well of the present invention;

[0018] Figure 3 This is a schematic diagram of the main cross-sectional structure of the irrigation and drainage pile of the present invention;

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the water wheel housing of the present invention from top view;

[0020] Figure 5 It is a schematic diagram of the main cross-sectional structure of the vertical rotating shaft of the present invention;

[0021] Figure 6 It is a schematic diagram of the cross-sectional structure of the upper rotating shaft of the present invention;

[0022] Figure 7 This is a schematic diagram of the cross-sectional structure of the lower rotating shaft of the present invention;

[0023] Figure 8 For the present invention Figure 2 A schematic diagram of the structure enlargement in the middle;

[0024] Fig. 9 It is a schematic diagram of the cross-sectional structure of the storage hopper of the present invention;

[0025] Fig.10 For the present invention Fig. 9 Enlarged schematic diagram of the structure at point B in the middle.

[0026] In the figure: 1, well; 2, water pump; 3, underground pipe network; 4, irrigation and drainage pile; 401, irrigation pile; 402, drainage pile; 5, electric control valve; 6, water wheel shell; 7, vertical shaft; 701, upper shaft; 702, lower shaft; 8, stirring blade; 9, water wheel blade; 10, driving bevel gear; 11, storage hopper; 12, horizontal shaft; 13, unloading plate; 14, driven bevel gear; 15, blind hole; 1 6. Spline groove; 17. Spline; 18. Cylinder; 19. Closed slide; 20. Slider; 21. Guide groove; 22. Guide block; 23. Arc sleeve; 24. Arc plate; 25. First elastic member; 26. Narrowing portion; 27. Water inlet hole; 28. Connecting port; 29. ​​Ore filter material layer; 30. Coarse aggregate material layer; 31. Sludge pump; 32. Limiting ring; 33. Second elastic member; 34. Sealing block. DETAILED DESCRIPTION

[0027] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] like Figures 1 to 10 As shown, a farmland water conservancy circulation irrigation and drainage facility includes a water well 1 and a controller, and also includes an underground pipe network 3 and a plurality of irrigation and drainage piles 4. A water pump 2 electrically connected to the controller is connected between the water well 1 and the underground pipe network 3. The underground pipe network 3 is buried below the farmland cultivation layer. The irrigation and drainage piles 4 include an irrigation pile 401 and a drainage pile 402 interconnected at the lower end of the side wall. An electric control valve 5 electrically connected to the controller is arranged between the irrigation pile 401 and the drainage pile 402. The lower end of the irrigation pile 401 is connected to the underground pipe network 3. The upper end of the irrigation pile 401 extends above the farmland cultivation layer. The upper end of the drainage pile 402 is at the surface.

[0029] A water wheel shell 6 connected to the underground pipe network 3 is arranged inside the water well 1, a vertical rotating shaft 7 penetrating the water wheel shell 6 is rotatably connected on the upper wall of the water well 1, a water wheel blade 9 located inside the water wheel shell 6 is arranged on the vertical rotating shaft 7, a driving bevel gear 10 is arranged on the upper end of the vertical rotating shaft 7, a storage hopper 11 for storing flocculants is arranged on the upper end of the water well 1, a horizontal rotating shaft 12 is rotatably connected inside the storage hopper 11, a plurality of discharge plates 13 are arranged in a ring array on the horizontal rotating shaft 12, and a driven bevel gear 14 meshing with the driving bevel gear 10 is coaxially arranged on the horizontal rotating shaft 12.

[0030] In specific use, when it rains or the surface water content is too high, the electric control valve 5 is opened, and the rainfall or surface water will enter the underground pipe network 3 through each drainage pile 402, and then flow through the water wheel housing 6 to converge into the water well 1. The water flow impacts the water wheel blades 9 in the water wheel housing 6 to make it rotate. The water wheel blades 9 drive the active bevel gear 10 to rotate through the vertical rotating shaft 7. The active bevel gear 10 drives the horizontal rotating shaft 12 to rotate through the driven bevel gear 14. The horizontal rotating shaft 12 drives the unloading plate 13 to rotate, so that the storage hopper 11 The flocculant falls evenly into the well 1 and mixes with the water entering the well 1, so that impurities such as suspended matter, particulate matter, and microorganisms in the water settle at the bottom of the well 1. During irrigation, the electric control valve 5 is closed, and a drip irrigation pipe or a sprinkler irrigation pipe is externally connected to each drainage pile 402. The water pump 2 draws purified water and transports it to each drainage pile 402 through the underground pipe network 3. The drainage pile 402 irrigates the farmland through the external drip irrigation pipe or sprinkler irrigation pipe. The irrigation and drainage are integrated, the impurity removal effect of the water body is good, and it is beneficial to the growth of crops.

[0031] Preferably, the irrigation pile 401 and the drainage pile 402 are both hollow structures. A connection port 28 is provided on the upper part of the irrigation pile 401, and a water inlet hole 27 is arranged on the surface of the drainage pile 402. The connection port 28 is used for farmland irrigation and is used to connect an external drip irrigation pipe or sprinkler pipe. When the rainfall or surface water content is too high, the rainfall or surface water will enter the drainage pile 402 through the water inlet hole 27, and then flow through the underground pipe network 3 to the well 1 for storage for farmland irrigation.

[0032] In order to achieve the purpose of improving the irrigation water treatment effect, preferably, a stirring blade 8 is provided on the vertical rotating shaft 7, and the water wheel blade 9 drives the stirring blade 8 to rotate through the vertical rotating shaft 7 to stir the water body and the flocculant, so that the flocculant is evenly mixed in the water body, thereby improving the impurity removal effect.

[0033] In order to achieve the purpose of improving the irrigation water treatment effect, preferably, the vertical rotating shaft 7 includes an upper rotating shaft 701 and a lower rotating shaft 702, a blind hole 15 is provided at the lower end of the upper rotating shaft 701, a spline groove 16 is provided on the inner side wall of the blind hole 15, and a spline 17 matched with the spline groove 16 is provided on the upper part of the lower rotating shaft 702, a cylinder 18 is provided on the inner bottom wall of the water well 1, a closed slide 19 is provided on the inner wall of the cylinder 18, a slider 20 matched with the closed slide 19 is provided at the lower end edge of the lower rotating shaft 702, and the stirring blade 8 is provided on the lower rotating shaft 702. During the rotation of the vertical rotating shaft 7, the slider 20 slides with the closed slide 19, which will enable the lower rotating shaft 702 to drive the stirring blade 8 to perform a compound movement of lifting and rotating, thereby improving the impurity removal effect.

[0034] In order to achieve the purpose of improving the irrigation water treatment effect, preferably, each blanking plate 13 is provided with a guide groove 21 on both sides, the guide groove 21 is slidably connected with a guide block 22, and an arc sleeve 23 is provided on the guide block 22. An arc plate 24 is slidably connected between the two opposite arc sleeves 23, and a first elastic member 25 is provided between the two ends of the arc plate 24 and the two arc sleeves 23. A telescopic device electrically connected to the controller is provided between the horizontal rotating shaft 12 and the arc plate 24. The first elastic member 25 is preferably a spring, and the telescopic device is preferably an electric telescopic rod or an electric hydraulic rod. When the water quality is poor, the controller controls the telescopic end of the telescopic device to retract, and the telescopic device drives the arc plate 24 to move toward the horizontal rotation axis 12. The two ends of the arc plate 24 shrink toward the inside of the two arc sleeves 23 to squeeze the first elastic member 25, thereby increasing the volume between the two adjacent unloading plates 13, increasing the feeding speed of the flocculant, and improving the water purification effect; when the water quality is relatively good, the controller controls the telescopic end of the telescopic device to extend, and the telescopic device drives the arc plate 24 away from the horizontal rotation axis 12, thereby reducing the volume between the two adjacent unloading plates 13, reducing the feeding speed of the flocculant, and saving flocculant.

[0035] In order to achieve the purpose of improving the effect of irrigation water treatment, preferably, the connection between the underground pipe network 3 and the water wheel shell 6 has a necking portion 26. According to Bernoulli's principle, when water flows from the underground pipe network 3 to the necking portion 26, the cross-sectional area of ​​the necking portion 26 becomes smaller, so the flow rate will increase, which will increase the impact force of the water flow on the water wheel blades 9, and then cause the discharge plate 13 to rotate, causing the flocculant to fall into the well 1 and mix with the water body, thereby improving the irrigation water treatment effect.

[0036] In order to prevent impurities from entering the irrigation pile 401, preferably, a limit ring 32 is provided inside the irrigation pile 401, a second elastic member 33 is provided on the inner top wall of the irrigation pile 401, and a sealing block 34 is provided at the lower end of the second elastic member 33 to fit the inner wall of the irrigation pile 401. The second elastic member 33 is preferably a spring. During the irrigation process, the water pump 2 draws irrigation water from the well 1 and transports it to the irrigation pile 401 through the underground pipe network 3. As the water pressure increases, the sealing block 34 will slide upward to squeeze the second elastic member 33, and the connecting port 28 will open. The irrigation water is discharged from the external drip irrigation pipe or sprinkler pipe at the connecting port 28 to irrigate the farmland. After the irrigation is completed, the water pressure disappears, and the sealing block 34 contacts the limit ring 32 under the action of the elastic potential energy of the second elastic member 33 to seal the connecting port 28 to prevent impurities from entering the irrigation pile 401 from the connecting port 28.

[0037] In order to prevent impurities from entering the drainage pile 402, preferably, a mineral filter layer 29 and a coarse aggregate material layer 30 are sequentially arranged on the outside of the drainage pile 402. The thickness of the coarse aggregate material layer 30 is 12-15 cm. The large pore water permeability characteristics are utilized to increase the lateral diffusion capacity of surface water and rainwater. The mineral filter layer 29 can filter large particles of impurities such as mud and sand in the surface water and rainwater, while increasing the vertical infiltration resistance, increasing the lateral diffusion and contact area, hindering the infiltration and evaporation of surface water and rainwater, and is conducive to recovering more surface water and rainwater and saving water resources.

[0038] In order to achieve the purpose of circulating irrigation and drainage, preferably, a sludge pump 31 is provided on the surface, one end of the sludge pump 31 extends into the inner bottom of the well 1, and the sludge at the bottom of the well is regularly cleaned by the sludge pump 31, which is conducive to sustainable use.

[0039] Compared with the prior art, the present invention is provided with a water well 1, a controller, an underground pipe network 3, a water pump 2, an irrigation pile 401, a drainage pile 402, an electric control valve 5, a water wheel housing 6, a vertical shaft 7, a water wheel blade 9, an active bevel gear 10, a storage hopper 11, a horizontal shaft 12, a feed plate 13 and a driven bevel gear 14. When it rains or the surface water content is too high, the electric control valve 5 is opened, and the rain or surface water will enter the underground pipe network 3 through each drainage pile 402, and then flow through the water wheel housing 6 and converge into the water well 1. The water flow impacts the water wheel blade 9 in the water wheel housing 6 to rotate it, and the water wheel blade 9 drives the active bevel gear 10 to rotate through the vertical shaft 7. The active bevel gear 10 drives the horizontal rotating shaft 12 to rotate through the driven bevel gear 14, and the horizontal rotating shaft 12 drives the unloading plate 13 to rotate, so that the flocculant in the storage hopper 11 evenly falls into the water well 1 and mixes with the water entering the water well 1, so that the impurities such as suspended matter, particulate matter, microorganisms, etc. in the water are settled at the bottom of the water well 1. During irrigation, the electric control valve 5 is closed, and a drip irrigation pipe or a sprinkler irrigation pipe is externally connected to each drainage pile 402. The water pump 2 draws purified water and transports it to each drainage pile 402 through the underground pipe network 3. The drainage pile 402 irrigates the farmland through the external drip irrigation pipe or sprinkler irrigation pipe. The drainage and irrigation are integrated, and the impurity removal effect of the water body is good, which is beneficial to the growth of crops.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A farmland water conservancy circulation irrigation and drainage facility, comprising a well (1) and a controller, characterized in that: It also includes an underground pipe network (3) and a plurality of irrigation and drainage piles (4), wherein a water pump (2) electrically connected to a controller is connected between the water well (1) and the underground pipe network (3), the underground pipe network (3) is buried below the cultivated layer of the farmland, the irrigation and drainage piles (4) include irrigation piles (401) and drainage piles (402) which are interconnected at the lower end of the side walls, an electric control valve (5) electrically connected to the controller is arranged between the irrigation piles (401) and the drainage piles (402), the lower end of the irrigation pile (401) is connected to the underground pipe network (3), the upper end of the irrigation pile (401) extends above the cultivated layer of the farmland, and the upper end of the drainage pile (402) is located on the surface of the ground; A water wheel housing (6) connected to an underground pipe network (3) is arranged inside the water well (1); a vertical rotating shaft (7) penetrating the water wheel housing (6) is rotatably connected to the upper wall of the water well (1); a water wheel blade (9) located inside the water wheel housing (6) is arranged on the vertical rotating shaft (7); a driving bevel gear (10) is arranged at the upper end of the vertical rotating shaft (7); a storage hopper (11) for storing flocculants is arranged at the upper end of the water well (1); a horizontal rotating shaft (12) is rotatably connected inside the storage hopper (11); a plurality of unloading plates (13) are arranged in an annular array on the horizontal rotating shaft (12); and a driven bevel gear (14) meshing with the driving bevel gear (10) is coaxially arranged on the horizontal rotating shaft (12).

2. The farmland water conservancy circulation irrigation and drainage facility according to claim 1, characterized in that: The irrigation pile (401) and the drainage pile (402) are both hollow structures. A connection port (28) is provided on the upper portion of the irrigation pile (401), and a water inlet hole (27) is arranged on the surface of the drainage pile (402).

3. The farmland water conservancy circulation irrigation and drainage facility according to claim 1 or 2, characterized in that: The vertical rotating shaft (7) is provided with a stirring blade (8).

4. The farmland water conservancy circulation irrigation and drainage facility according to claim 3 is characterized in that: The vertical rotating shaft (7) comprises an upper rotating shaft (701) and a lower rotating shaft (702); a blind hole (15) is provided at the lower end of the upper rotating shaft (701); a spline groove (16) is provided on the inner side wall of the blind hole (15); a spline (17) matched with the spline groove (16) is provided on the upper part of the lower rotating shaft (702); a cylinder (18) is provided on the inner bottom wall of the water well (1); a closed slideway (19) is provided on the inner wall of the cylinder (18); a slider (20) matched with the closed slideway (19) is provided at the lower end edge of the lower rotating shaft (702); and the stirring blade (8) is arranged on the lower rotating shaft (702).

5. The farmland water conservancy circulation irrigation and drainage facility according to claim 4 is characterized in that: Guide grooves (21) are provided on both sides of each blanking plate (13), and a guide block (22) is slidably connected inside the guide groove (21), and an arc sleeve (23) is provided on the guide block (22). An arc plate (24) is slidably connected between two opposite arc sleeves (23), and a first elastic member (25) is provided between the two ends of the arc plate (24) and the two arc sleeves (23), and a telescopic device electrically connected to the controller is provided between the horizontal rotating shaft (12) and the arc plate (24).

6. The farmland water conservancy circulation irrigation and drainage facility according to claim 5, characterized in that: The connection between the underground pipe network (3) and the water wheel housing (6) is provided with a necking portion (26).

7. The farmland water conservancy circulation irrigation and drainage facility according to claim 6, characterized in that: A limit ring (32) is arranged inside the irrigation pile (401), a second elastic member (33) is arranged on the inner top wall of the irrigation pile (401), and a sealing block (34) is arranged at the lower end of the second elastic member (33) and is in contact with the inner wall of the irrigation pile (401).

8. The farmland water conservancy circulation irrigation and drainage facility according to claim 7 is characterized in that: The outer side of the drainage pile (402) is provided with an ore filter material layer (29) and a coarse aggregate material layer (30) in sequence.

9. The farmland water conservancy circulation irrigation and drainage facility according to claim 8, characterized in that: A sludge pump (31) is provided on the ground surface, and one end of the sludge pump (31) extends into the inner bottom of the water well (1).

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