Stockyard material pit waterlogging prevention and drainage system and implementation method thereof

Abstract

The invention discloses a waterlogging-preventing drainage system for a storage yard material pit and an implementation method of the waterlogging-preventing drainage system. The waterlogging-preventing drainage system comprises the material pit, an annular drainage ditch, a drainage well, a concrete retaining wall, a permeable pipe, a rotor pump, a filter screen and a rotor pump. The elevation of the pit is lower than that of the surrounding storage yard, an annular drainage ditch is arranged around the bottom of the pit, and the bottom of the annular drainage ditch slopes towards the drainage well; the drainage wells are located at the four corners of the pit and separated from the pit through concrete retaining walls. Permeable pipes are evenly embedded in the concrete retaining wall, and a filter screen is arranged on one side of the concrete retaining wall. A water suction port of a water suction pipe of the rotor pump is positioned at the bottom of the drainage well; and a water outlet pipe of the rotor pump is connected to drainage facilities on nearby storage yards. According to the implementation method of the waterlogging prevention and drainage system for the storage yard material pit, self-adaptive drainage of the material pit in different stacking states is achieved by arranging a graded drainage structure, and the waterlogging prevention and drainage system has the advantages of being high in drainage efficiency, capable of preventing blockage, easy to maintain and the like and is particularly suitable for waterlogging prevention of open-air material storage yards in the industries of metallurgy, coal and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage, and in particular to a storage pit flood prevention and drainage system and an implementation method thereof. Background Art

[0002] In industrial production, especially in the metallurgical and coal industries, material pits are important places for material storage, and their drainage problems directly affect production safety and environmental safety. Especially during rainfall, long-term accumulation of water in the material pits may lead to material damage, environmental pollution, and problems with the safety of the material pit structure. Doing a good job in material pit drainage is a prerequisite for ensuring the safety of materials and production. Especially for sunken open-pit mines, they objectively have the conditions to collect atmospheric precipitation, surface runoff and groundwater. Therefore, effective flood control and drainage measures must be taken during the infrastructure construction period and the entire production period of the open-pit mine. Existing drainage solutions have disadvantages such as low efficiency, high maintenance costs or unsuitability for large-scale application. Therefore, a high-efficiency, low-cost and easy-to-maintain flood control and drainage system is needed.

[0003] Chinese invention patent CN109882178B (authorization announcement date June 29, 2021) discloses a method for segmented drainage of open pit mines, in which an open pit bottom water tank is set at the bottom of the open pit, and a submersible pump is arranged on an open-air platform above the open pit bottom water tank. A chamber is constructed horizontally on the slope of the open pit platform above the position of the conventional fixed pump station water pump, and the position of the chamber should avoid the fault; a chamber water tank is built downward in the chamber, and a chamber fixed pump station water pump is installed in the chamber; the submersible pump will concentrate the open pit water that converges into the open pit bottom water tank and pump it into the chamber water tank in the chamber, and then the chamber fixed pump station water pump will pump it out of the open pit. This invention can mine part of the slope pressure ore and reduce ore loss; at the same time, the chamber fixed pump station water pump is not affected by surface meteorological conditions, slope rolling stones, etc., and there is no need to build a fixed pump station water pump room. The above invention aims to reduce ore loss and at the same time reduce the impact of surface meteorological conditions, slope rolling stones, etc. on water pumps.

[0004] Chinese utility model patent CN109882178U (authorization announcement date February 23, 2021) discloses a drainage system for a concrete aggregate site. The system includes a storage area surrounded by drainage ditches. The drainage ditches contain multiple parallel water filtration devices. The water filtration devices include a hollow filter box with a filter panel on top and multiple filter holes. The filter box has a grid-like steel grating inside and a filter screen at the bottom. The patent aims to reduce clogging of the drainage system by concrete aggregates through the installation of multiple layers of filter grids.

[0005] In summary, existing drainage methods for open pit mines are relatively simple, consisting essentially of drainage ditches on the pit surface, directly connected to a water collection well. These methods lack a systematic drainage structure or solution, making it difficult to meet the drainage needs of the pit under varying material stacking conditions. Consequently, these methods suffer from low drainage efficiency, are unsuitable for large-scale mines, and are difficult to maintain. Summary of the Invention

[0006] In view of this, the present application provides a storage pit flood prevention and drainage system and its implementation method. The system has high drainage efficiency, is anti-clogging, and can adapt to different storage pit conditions. The implementation method is simple to operate and easy to maintain, and has a graded drainage function. The specific technical solution is described as follows:

[0007] A flood prevention and drainage system for a storage pit comprises a pit, a circular drainage ditch, a drainage well, a concrete retaining wall, a permeable pipe and a rotor pump.

[0008] The material pit is set in the stockpile, the elevation of the material pit is lower than the surrounding stockpile, and the ramp is used to connect with the stockpile; an annular drainage ditch is set around the bottom of the material pit, and the bottom of the material pit is sloped towards the annular drainage ditch on all four sides, and the bottom of the annular drainage ditch is sloped towards the drainage well; the drainage well is located at the four corners of the material pit and is separated from the material pit by a concrete retaining wall; permeable pipes are evenly pre-buried on the concrete retaining wall; a rotor pump is set on the stockpile ground next to the drainage well, and the water suction port of the rotor pump suction pipe is located at the bottom of the drainage well, and the rotor pump outlet pipe is connected to the drainage facilities near the material pit.

[0009] Furthermore, a movable filter is provided on one side of the concrete retaining wall to prevent large particles in the material pit from entering the drainage well.

[0010] Furthermore, the filter is arranged on the side of the concrete retaining wall close to the drainage well, and can be assembled by splicing multiple pieces. Each filter is provided with a handle to move the filter up and down. A filter cover is provided on the top of the filter, and the filter cover can be opened to facilitate cleaning, maintenance and replacement of the filter.

[0011] Furthermore, U-shaped steel plates are pre-embedded on the concrete retaining walls on both sides of the filter screen, and the inner width of the U-shaped steel plates is greater than the width of the filter screen, which facilitates the installation and up and down movement of the filter screen.

[0012] Furthermore, the diameter of the water-permeable pipe is 150-250 mm, and the distance between the pipe centers is 600-1200 mm.

[0013] Furthermore, the permeable pipe is arranged at an angle, with a slope from the material pit to the drainage well, and a slope of 2% to 5%.

[0014] Furthermore, the filter screen is made of stainless steel, and the mesh size is set according to the size of the material piled in the pit. The filter screen can be set to multiple layers, and geotextiles or pebbles are set between the multiple layers of filter screens for isolation and filtration.

[0015] Preferably, the filter mesh size is 10 to 30 mm.

[0016] Furthermore, the rotor pump is provided with a water level sensor, which can be started and stopped according to the water level of the drainage well.

[0017] Furthermore, the annular drainage ditch is a side ditch with a triangular cross section. The side ditch is passable by a pusher and rake machine, which facilitates the cleaning of mineral powder in the annular drainage ditch.

[0018] Furthermore, a cover plate is provided at a part of the connection between the annular drainage ditch and the ramp to allow people and vehicles to pass through.

[0019] Furthermore, a fixed concrete manhole cover is provided on one side of the top of the drainage well, an inspection hole is provided on the concrete manhole cover, and an openable mud cleaning hole cover is provided on the other side of the top of the drainage well.

[0020] Furthermore, the inspection hole is arranged close to the inner wall of the drainage well, and a stainless steel ladder is provided on the corresponding inner wall of the drainage well below for maintenance. The inspection hole is provided with a steel cover plate, and a ring handle is provided on the steel cover plate.

[0021] Furthermore, a drainage pipe support is provided on the concrete manhole cover for fixing the drainage pipe.

[0022] Furthermore, a ditch is provided around the material pit on the storage yard surrounding the material pit to prevent runoff rainwater from the storage yard from being discharged into the material pit.

[0023] The present application also provides an implementation method corresponding to the above system, specifically: an implementation method of a storage pit flood prevention and drainage system, comprising the following steps:

[0024] S1: When the pit is not stockpiled, the runoff rainwater generated by rainfall is discharged into the circular drainage ditch along the slope of the pit bottom. The rainwater in the circular drainage ditch is discharged into the adjacent drainage well through the permeable pipe, and then lifted by the rotor pump in the drainage well and transported to the drainage facilities on the nearby yard;

[0025] S2: When the material pit is not yet full, the runoff generated by rainfall is mainly discharged through the surface of the materials, and then discharged into the drainage wells at the four corners of the material pit through the permeable pipes on the concrete retaining wall. The rotor pumps in the drainage wells are then lifted and transported to the drainage facilities on the nearby yard.

[0026] S3: When the pit is full, the runoff rainwater generated by precipitation is mainly discharged to the drainage facilities on the yard around the pit;

[0027] S4: When the material in the pit is emptied, the pusher rake enters the pit to clean the annular drainage ditch, opens the mud hole cover, and cleans the sediment in the drainage well; opens the filter cover and cleans the filter.

[0028] Compared with the prior art, the technical solution of this application has the following advantages and effects:

[0029] 1. The drainage system of the present application realizes high-efficiency adaptive drainage under different stockpiling conditions of the material pit by setting up a hierarchical drainage structure, including a circular drainage ditch at the bottom of the material pit, drainage wells set at the four corners, a permeable concrete retaining wall and an intelligent pump group.

[0030] 2. The drainage system of this application can effectively prevent the permeable holes on the concrete retaining wall from being blocked when different materials are piled up through the inclined setting of the filter screen and the drainage holes; the annular drainage ditch is set as a side ditch for the passage of the push rake machine, which has the advantages of easy maintenance and high drainage efficiency.

[0031] 3. The drainage system of this application is convenient for later cleaning and maintenance by setting a movable filter on one side of the drainage well; the design of the drainage well cover ensures the safety of personnel while effectively preventing materials from the pit from falling into the drainage well, reducing the occurrence of blockages.

[0032] 4. The implementation method of the drainage system of this application is simple to operate and easy to maintain, and is suitable for flood prevention in large-scale material pits.

[0033] The above is only an overview of the technical solution of the present application. In order to enable the technical means of the present application to be implemented in accordance with the contents of the specification and to make the above-mentioned and other purposes, features and advantages of the present application more clearly understood, the embodiments of the present application are described in detail below with reference to the accompanying drawings. Based on the detailed description of the specific embodiments of the present application below in conjunction with the accompanying drawings, those skilled in the art will have a better understanding of the above-mentioned and other purposes, features and advantages of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the technical solutions of the present invention and its embodiments, the following briefly describes the accompanying drawings used in describing the embodiments of the present invention. Similar elements or parts are generally identified by similar reference numerals throughout the accompanying drawings. Elements or parts in the accompanying drawings are not necessarily drawn to scale.

[0035] Figure 1 This is a schematic diagram of the plan layout of the drainage system in Example 1 of the present invention;

[0036] Figure 2 This is a partial plan view of the material pit in Example 1 of the present invention;

[0037] Figure 3 This is a partial top view of the material pit in Example 1 of the present invention;

[0038] Figure 4 This is a partial cross-sectional view of the material pit taken along line aa in Example 1 of the present invention;

[0039] Figure 5 This is a partial cross-sectional view of the material pit at line bb in Example 1 of the present invention;

[0040] Figure 6 1 is a schematic elevation view of a concrete retaining wall according to Example 1 of the present invention;

[0041] Figure 7 FIG. c is a partially enlarged schematic diagram of the embedded steel plate of the filter screen in Example 1 of the present invention;

[0042] Figure 8 This is a top view and a cross-sectional view of the steel cover plate of Example 2 of the present invention.

[0043] in Figure 8 (a) is the top view, Figure 8 (b) is a cross-sectional structural diagram.

[0044] Figure numerals: 1. Material pit; 2. Annular drainage ditch; 3. Drainage well; 31. Concrete manhole cover; 32. Mud cleaning hole cover; 33. Steel cover; 331. Annular handle; 4. Concrete retaining wall; 5. Permeable pipe; 6. Rotor pump; 61. Drainage pipe support; 7. Filter screen; 71. Filter screen cover; 72. U-shaped steel plate. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention include direct and indirect connections (couplings) unless otherwise specified. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0047] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] Example 1

[0049] This embodiment provides a yard material pit flood prevention and drainage system, a yard material pit flood prevention and drainage system, including a material pit 1, a circular drainage ditch 2, a drainage well 3, a concrete retaining wall 4, a permeable pipe 5, a rotor pump 6, and its plane layout diagram is shown in FIG. Figure 1 .

[0050] The material pit 1 is set in the storage yard, the elevation of the material pit 1 is lower than the surrounding storage yard, and a ramp is used to connect with the storage yard; a circular drainage ditch 2 is set around the bottom of the material pit 1, and the bottom surface of the material pit 1 is sloped towards the circular drainage ditch 2 on all four sides, and the bottom of the circular drainage ditch 2 is sloped towards the drainage well 3;

[0051] The drainage well 3 is located at the four corners of the material pit 1 and is separated from the material pit 1 by a concrete retaining wall 4; the local plan view of the material pit is as follows Figure 2 As shown, the local top view of the pit is as follows Figure 3 As shown, the concrete retaining wall 4 is evenly pre-buried with permeable pipes 5; a rotor pump 6 is set on the ground of the yard next to the drainage well 3, the water suction port of the rotor pump 6 suction pipe is located at the bottom of the drainage well 3, and the outlet pipe of the rotor pump 6 is connected to the drainage facilities near the material pit 1. The partial cross-sectional schematic diagrams are shown as follows: Figure 4 、 Figure 5 As shown, the facade of the concrete retaining wall is as follows Figure 6 shown.

[0052] As an embodiment, a movable filter screen 7 is provided on one side of the concrete retaining wall 4 to prevent large particles in the material pit 1 from entering the drainage well and causing blockage.

[0053] As an embodiment, the filter screen 7 is arranged on the side of the concrete retaining wall 4 close to the drainage well 3, and can be composed of multiple pieces. Each filter screen 7 is provided with a handle that can be moved up and down for easy maintenance and replacement. A filter screen cover 71 is provided on the top of the filter screen 7, and the filter screen cover 71 can be opened.

[0054] As an embodiment, U-shaped steel plates 72 are embedded in the concrete retaining walls 4 on both sides of the filter 7. The inner width of the U-shaped steel plates 72 is greater than the width of the filter 7, which facilitates the installation and up and down movement of the filter 7. The local structure is as follows: Figure 7 shown.

[0055] As an embodiment, the diameter of the water-permeable pipe 5 is 150-250 mm, and the center distance between the pipes is 600-1200 mm.

[0056] As an embodiment, the permeable pipe 5 is arranged at an angle, with a slope from the material pit 1 to the drainage well 3, and a slope of 2% to 5%.

[0057] As an embodiment, the filter screen 7 is made of stainless steel, and the mesh of the filter screen 7 is set according to the size of the material piled in the pit 1. The filter screen 7 can be set to multiple layers, and geotextiles or pebbles are set between the multiple layers of filter screen 7 for isolation and filtration.

[0058] As an embodiment, the mesh size of the filter screen 7 is 10 to 30 mm.

[0059] The technical effect achieved by this embodiment is: by setting up a hierarchical drainage structure, including a circular drainage ditch at the bottom of the material pit, drainage wells set at the four corners, a permeable concrete retaining wall and an intelligent pump group, high-efficiency adaptive drainage is achieved under different stacking conditions of the material pit.

[0060] Example 2

[0061] This embodiment, based on the first embodiment, provides a storage pit flood prevention and drainage system, specifically:

[0062] As an embodiment, the rotor pump 6 is provided with a water level sensor, and can be started and stopped according to the water level of the drainage well 3 .

[0063] As an embodiment, the annular drainage ditch 2 is configured as a side ditch, and a pusher rake can pass through the side ditch to facilitate cleaning of the mineral powder in the annular drainage ditch 2;

[0064] As an embodiment, the cross section of the annular drainage ditch 2 is triangular.

[0065] As an implementation method, a grate is provided at a part of the connection between the annular drainage ditch 2 and the ramp to allow workers and construction vehicles to pass through.

[0066] As an embodiment, a fixed concrete manhole cover 31 is provided on one side of the top of the drainage well 3 , an inspection hole is provided on the concrete manhole cover 31 , and an openable mud cleaning hole cover 32 is provided on the other side of the top of the drainage well 3 .

[0067] As an embodiment, the inspection hole is set close to the inner wall of the drainage well 3, and a stainless steel ladder is set on the inner wall of the corresponding drainage well 3 below for maintenance. A steel cover plate 33 is also set on the inspection hole, and a ring handle 331 is set on the steel cover plate 33. The top view and cross-sectional structure diagram of the steel cover plate are as follows: Figure 8 shown.

[0068] As an embodiment, a drainage pipe support 61 is further provided on the concrete manhole cover 31 for fixing the drainage pipe.

[0069] As an embodiment, intercepting ditches are provided on the storage yard around the material pit 1 to prevent runoff rainwater from the storage yard from being discharged into the material pit 1 .

[0070] The technical effects achieved by this embodiment are:

[0071] 1. The annular drainage ditch of this system adopts a triangular cross-section design, which makes it easier for workers to operate a push rake to clean the annular drainage ditch, thereby improving maintenance efficiency.

[0072] 2. This system improves the safety and maintenance convenience of the system through the design of protective railings, maintenance ladders, and drainage ditches with grates.

[0073] 3. This system improves the intelligence level of the drainage system by setting a water level sensor on the rotor pump, reduces labor costs and improves work efficiency.

[0074] Example 3

[0075] This embodiment, based on Example 1 or Example 2, provides an implementation method of a storage pit flood prevention and drainage system, specifically comprising the following steps:

[0076] S1: When the pit 1 is not stockpiled, the runoff rainwater generated by precipitation is discharged along the slope of the bottom of the pit 1 to the annular drainage ditch 2. The rainwater in the annular drainage ditch 2 is discharged to the adjacent drainage well 3 through the permeable pipe 5, and then lifted by the rotor pump 6 of the drainage well 3 to the drainage facilities on the nearby yard;

[0077] S2: When the material pit 1 is not yet full during the stacking process, the runoff rainwater generated by precipitation is mainly discharged through the surface of the materials, and is discharged to the drainage wells 3 at the four corners of the material pit 1 through the permeable pipes 5 on the concrete retaining wall 4. The rotor pump 6 of the drainage well 3 is then lifted and transported to the drainage facilities on the nearby yard;

[0078] S3: When the material pit 1 is full, the runoff rainwater generated by precipitation is mainly discharged to the drainage facilities on the yard around the material pit 1;

[0079] S4: After the material in the pit 1 is emptied, the pusher rake enters the pit 1 to clean the annular drainage ditch 2; the mud cleaning hole cover 32 is opened to clean the sediment in the drainage well 3; the filter cover 71 is opened, the filter 7 is removed, and reset after cleaning.

[0080] The technical effect achieved by this embodiment is: by setting up a hierarchical drainage structure, including a circular drainage ditch at the bottom of the material pit, drainage wells set at the four corners, a permeable concrete retaining wall and an intelligent pump group, high-efficiency adaptive drainage under different stacking conditions of the material pit is achieved. This implementation method has simple steps and is easy to maintain, and is suitable for flood control in large-scale material pits.

[0081] The above description is merely an exemplary embodiment of the present invention, and is not intended to be exhaustive. It should be understood by those skilled in the art that various modifications and variations may be made to the exemplary embodiments of the present invention without departing substantially from the spirit and scope of the present disclosure, and all such modifications and variations are intended to fall within the scope of protection defined by the claims.

Claims

1. A flood prevention and drainage system for a storage pit, characterized by: It includes a material pit (1), an annular drainage ditch (2), a drainage well (3), a concrete retaining wall (4), a permeable pipe (5), and a rotor pump (6); The material pit (1) is arranged in a storage yard, and the elevation of the material pit (1) is lower than the surrounding storage yard. An annular drainage ditch (2) is arranged around the bottom of the material pit (1). The bottom surface of the material pit (1) is sloped toward the annular drainage ditch (2) on all four sides, and the bottom surface of the annular drainage ditch (2) is sloped toward the drainage well (3); the drainage well (3) is located at the four corners of the material pit (1) and is separated from the material pit (1) by a concrete retaining wall (4); water-permeable pipes (5) are evenly pre-buried on the concrete retaining wall (4); a rotor pump (6) is arranged on the storage yard ground next to the drainage well (3), the water suction port of the rotor pump (6) suction pipe is located at the bottom of the drainage well (3), and the water outlet pipe of the rotor pump (6) is connected to the drainage facilities near the material pit (1).

2. The storage pit flood prevention and drainage system according to claim 1, characterized in that: A movable filter screen (7) is provided on one side of the concrete retaining wall (4).

3. The storage pit flood prevention and drainage system according to claim 2, characterized in that: The diameter of the water-permeable pipe (5) is 150-250 mm, and the distance between the pipe centers is 600-1200 mm. The water-permeable pipe (5) is tilted and slopes from the material pit (1) to the drainage well (3), with a slope of 6%-10%.

4. The storage pit flood prevention and drainage system according to claim 2, characterized in that: The filter screen (7) is arranged close to one side of the drainage well (3), and U-shaped steel plates (72) are pre-embedded on the concrete retaining walls (4) on both sides of the filter screen (7).

5. The storage pit flood prevention and drainage system according to claim 4, characterized in that: The filter screen (7) is composed of a plurality of pieces spliced ​​together, and each filter screen (7) can be arranged in multiple layers, with geotextiles or pebbles arranged between the multiple layers of filter screens (7).

6. A storage pit flood prevention and drainage system according to any one of claims 1 to 5, characterized in that: The annular drainage ditch (2) is a side ditch, and a pusher and rake machine can pass through the side ditch.

7. The storage pit flood prevention and drainage system according to claim 5, characterized in that: The cross section of the annular drainage ditch (2) is triangular.

8. The storage pit flood prevention and drainage system according to claim 7, characterized in that: A fixed concrete manhole cover (31) is provided on one side of the top of the drainage well (3), an inspection hole is provided on the concrete manhole cover (31), and an openable mud-clearing hole cover (32) is provided on the other side of the top of the drainage well (3).

9. The storage pit flood prevention and drainage system according to claim 8, characterized in that: A ditch is provided on the storage yard around the material pit (1) to prevent runoff rainwater from the storage yard from being discharged into the material pit (1).

10. The method for implementing the storage pit flood prevention and drainage system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: When the pit (1) is not stacked with materials, the runoff rainwater generated by precipitation is discharged along the slope direction of the bottom of the pit (1) to the annular drainage ditch (2). The rainwater in the annular drainage ditch (2) is discharged to the adjacent drainage well (3) through the permeable pipe (5), and then lifted by the rotor pump (6) of the drainage well (3) and transported to the drainage facilities on the nearby storage yard; S2: When the material pit (1) is not yet full during the stacking process, the runoff rainwater generated by precipitation is mainly discharged through the surface of the material, and is discharged to the drainage wells (3) at the four corners of the material pit through the permeable pipes 5 on the concrete retaining wall (4), and then lifted by the rotor pump (6) of the drainage well (3) and transported to the drainage facilities on the nearby yard; S3: When the material pit (1) is full, the runoff rainwater generated by precipitation is mainly discharged to the drainage facilities on the yard around the material pit (1); S4: After the material in the material pit (1) is emptied, the sediment in the drainage ditch (2), the drainage well (3) and the filter (7) are cleaned.

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