CN218667829U - Drainage well group and flood drainage system for tailing pond - Google Patents
Drainage well group and flood drainage system for tailing pond Download PDFInfo
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- CN218667829U CN218667829U CN202223320937.6U CN202223320937U CN218667829U CN 218667829 U CN218667829 U CN 218667829U CN 202223320937 U CN202223320937 U CN 202223320937U CN 218667829 U CN218667829 U CN 218667829U
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Abstract
The utility model provides a tailing pond drainage well crowd and drainage system relates to mine tailing drainage technical field, the utility model provides a tailing pond drainage well crowd includes base and many drainage wells, and each drainage well is installed in the top of base, has drainage channel in the base, and drainage channel has a drainage mouth and with the water inlet of a plurality of drainage well encircleed space one-to-ones intercommunication, outlet and each water inlet intercommunication. The utility model provides a tailing storehouse drainage well crowd can realize a outlet of a plurality of drainage well sharing, has saved the construction cost of later stage connection tunnel, the centralized unified management of the system of draining floodwaters of being convenient for. Meanwhile, each drainage well can be designed into different sizes and types so as to meet the requirements on different flood discharge capacities.
Description
Technical Field
The utility model belongs to the technical field of mine tailing flood drainage technique and specifically relates to a tailing storehouse drainage shaft well crowd and flood drainage system are related to.
Background
The drainage well is used as a beach surface water inlet structure which has large water inlet capacity, economic manufacturing cost and convenient maintenance, and is widely applied to design and construction of a drainage system of a tailing pond. The drainage wells are commonly used in window type drainage wells, frame baffle type drainage wells and the like, and the drainage wells are generally used in an integrated flood drainage system with later connected flood drainage structures (such as flood drainage culvert pipes and flood drainage tunnels) and the like.
In a tailing pond, the height of a single drainage well is generally set to be about 10m-30 m; when the total service height of the tailing pond is relatively high, a plurality of drainage wells are required to be arranged at different water inlet elevations in the construction of the tailing pond so as to fulfill the aim of draining flood in the full-operation elevation of the tailing pond. In the arrangement scheme of each drainage well, the drainage wells and branch tunnels (or branch culvert pipes) are dispersedly arranged at different positions of a reservoir area and connected to a main tunnel (or main culvert pipe) for the main purpose of meeting the requirement of the length of a dry beach required by flood control and meeting the requirement of clear backwater in a reservoir according to the service elevation stage of each drainage well and the change of the depth in a tailing reservoir at the using stage.
The disadvantages of the arrangement mode of the drainage well are as follows: (1) Since each drainage well is connected to a corresponding branch tunnel (or culvert pipe) and to a main tunnel (or culvert pipe), the construction cost of the flood drainage system is relatively high. Especially, when the required flood discharge flow in the tailings pond is large, two or more drainage wells are required to be arranged at the same water inlet elevation to discharge the flood together so as to meet the requirement of the water inlet capacity of the beach surface, and the construction cost for constructing a plurality of branch systems such as the drainage wells and branch tunnels (branch pipes) is relatively high. (2) The whole layout of drainage well is comparatively dispersed on the plane in tailing storehouse, the centralized unification and the safety control of the facility of draining floodwaters of being not convenient for. Particularly, when unfavorable geological conditions in the tailings pond are relatively developed (when high and steep slopes in the tailings pond are more, collapsed landslide debris flows are relatively developed, and sections with better geological conditions in the tailings pond are relatively few), the problems that the safety of a flood drainage system is reduced, and flood drainage wells are easy to damage and the like can be caused by excessively distributed drainage wells.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a tailing storehouse drainage well crowd and drainage system can realize a outlet of a plurality of drainage well sharing, has saved the construction cost of later stage connection tunnel, the centralized unified management of the drainage system of being convenient for. Meanwhile, each drainage well can be designed into different sizes and types so as to meet the requirements on different flood discharge capacities.
In order to achieve the above object, the utility model provides a following technical scheme:
in a first aspect, the utility model provides a tailing storehouse drainage shaft well crowd, including base and many drainage shafts, each drainage shaft install in the top of base, drainage channel has in the base, drainage channel has a drain port and with a plurality of the water inlet of drainage shaft encirclement space one-to-one intercommunication, outlet and each the water inlet intercommunication.
Further, the drainage wells may be of the same type for each seat, or at least some of the drainage wells may be of different types.
Further, the drainage well is configured into two, wherein one of the drainage wells is a frame-type drainage well, and the other drainage well is a window-type drainage well.
Further, the height of each drainage well is consistent, or at least the height of part of the drainage wells is inconsistent.
Further, the drainage wells are configured to be two, three or four, and the heights of the drainage wells are consistent or the heights of the drainage wells are not consistent.
Further, the drainage channel comprises a vertical drainage channel, a plurality of horizontal drainage channels and a plurality of vertical energy dissipation channels, the plurality of vertical energy dissipation channels are communicated with the vertical drainage channel through the plurality of horizontal drainage channels in a one-to-one correspondence mode, the top of each vertical energy dissipation channel is provided with the water inlet, and the side of the vertical drainage channel is communicated with the water outlet.
Further, the bottom end of the vertical energy dissipation channel is 1.0-1.5m lower than the bottom end of the transverse drainage channel communicated with the vertical energy dissipation channel.
Further, the bottom ends of the vertical drainage channels are lower than the bottom ends of the transverse drainage channels.
Further, a plurality of the drainage wells are evenly spaced around the center of the base.
In a second aspect, the utility model also provides a flood discharge system, including above-mentioned scheme tailing storehouse drainage well crowd.
The utility model provides a tailing storehouse drainage shaft well crowd and flood drainage system can produce following beneficial effect:
and under the condition that the final use elevation of each drainage well in the drainage well group is consistent: the different drainage wells mainly play a role in increasing the drainage capacity when the drainage wells operate at the same elevation, realizing the mutual standby of the drainage wells or increasing the flood drainage safety margin of a tailing pond; in the event that the final elevation of use for each drainage well is inconsistent: before the next drainage well is started, the height difference between the two drainage wells can be used for completing the plugging work of the previous drainage well (the drainage well is not used after being plugged), and the requirement of continuous flood drainage in a specific elevation stage (or a full service period elevation stage) of a tailing pond can be met.
Of course, the final elevations of a plurality of drainage wells can be partially consistent and partially inconsistent.
Compared with the prior art, the utility model provides a tailing storehouse drainage well crowd can realize a outlet of a plurality of drainage well sharing, has saved the construction cost of later stage connection tunnel, the unified management of the concentration of the system of draining floodwaters of being convenient for. Meanwhile, each drainage well can be designed into different sizes and types so as to meet the requirements on different flood discharge capacities.
The utility model discloses the flood drainage system that the second aspect provided has the utility model discloses the tailing storehouse drainage shaft well crowd that the first aspect provided, thereby have the utility model discloses all beneficial effects that the tailing storehouse drainage shaft well crowd that the first aspect provided had.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic three-dimensional structure diagram of a first tailing pond drainage well group provided by the embodiment of the utility model;
fig. 2 is a schematic three-dimensional structure diagram of a second tailing pond drainage well group provided by the embodiment of the invention;
fig. 3 is a schematic three-dimensional structure diagram of a drainage well group of a third tailing pond provided by the embodiment of the utility model;
fig. 4 is a schematic three-dimensional structure diagram of a fourth tailing pond drainage well group provided by the embodiment of the present invention;
fig. 5 is a schematic three-dimensional structure diagram of a fifth kind of tailing pond drainage well group provided by the embodiment of the present invention;
fig. 6 is a schematic three-dimensional structure diagram of a drainage well group of a sixth tailings pond provided by the embodiment of the present invention;
fig. 7 is a schematic three-dimensional structure diagram of a seventh kind of tailing pond drainage well group provided by the embodiment of the present invention;
fig. 8 is a schematic three-dimensional structure diagram of an eighth drainage well group of the tailing pond provided by the embodiment of the present invention;
fig. 9 is a schematic three-dimensional structure diagram of a ninth tailing pond drainage well group provided by the embodiment of the present invention;
fig. 10 is a schematic front view of a drainage well group of a seventh tailing pond according to an embodiment of the present invention;
fig. 11 is a schematic top view of a drainage well group of a seventh tailing pond according to an embodiment of the present invention;
fig. 12 isbase:Sub>A schematic view of the cross-sectional structurebase:Sub>A-base:Sub>A of fig. 11.
Icon: 1-a base; 11-a drainage channel; 111-a drain outlet; 112-a water inlet; 113-vertical drainage channels; 114-lateral drainage channels; 115-vertical energy dissipation channels; 1151-energy dissipation pit; 116-a transverse communication channel; 2-a drainage well; 21-a derrick; 211-a first mast; 212-a second mast; 213-a third derrick; 22-a wellbore; 221-a second wellbore; 222-third wellbore.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It should be understood that the description herein is provided for illustration and explanation of the invention and is not intended to limit the invention.
An embodiment of the first aspect of the utility model provides a tailing storehouse drainage well crowd, as shown in fig. 1, including base 1 and many drainage wells 2, each drainage well 2 is installed in the top of base 1, has drainage channel 11 in the base 1, and drainage channel 11 has a drainage port 111 and communicates with the water inlet 112 of a plurality of drainage wells 2 encirclement space one-to-one, and drainage port 111 communicates with each water inlet 112.
Above-mentioned tailing storehouse drainage well crowd has integrateed a plurality of drainage wells 2 on a base 1, can be with the leading-in base of flood through water inlet 112 to water drainage channel 11 through in the base gathers together, finally discharges through a outlet 111, can save the construction cost of later stage connection tunnel, the unified management of concentrating of the system of being convenient for flood discharge.
The types and sizes of the individual drainage wells 2 may be completely different or partly different in order to meet the requirements for different flood discharge capacities.
The drainage well group of the tailing pond can be suitable for the following working scenes:
1) The tailings pond is operated in the tailings pond with little change of the depth condition in each stage of the pond, such as a flat tailings pond and a mountain-shaped tailings pond. Because the depth change in the tailings pond is not large in each stage due to the flat terrain and the mountainside tailings pond, after the requirement of the dry beach length required by flood control and the clarification distance required by tailing water in the tailings pond are met, well groups can be arranged in a centralized and site-selected mode, and the flood discharge requirement in a specific elevation range (or in the full service period elevation range of the tailings pond) can be realized.
2) The method is used when unfavorable geological conditions develop in a tailing pond. Aiming at the relatively developed unfavorable geology of a tailing reservoir area, when the number of good geological sections for constructing drainage wells is small, and the potential safety hazard of operation of the drainage wells possibly caused by scattered construction of the drainage wells, the drainage wells can be constructed in a well group mode.
3) The tailings pond is used when the required flood discharging capacity is large. When the available flood control height of the tailing pond is small (the slope of a dry beach is slow, the length of the dry beach is short), and the flood discharge capacity of the defense standard cannot be met by a single drainage well in a small flood control height range, a well group mode can be adopted to build double drainage wells 2 or multiple rows of wells 2 to meet the discharge capacity requirement.
4) The tailing pond needs to be provided with a spare drainage well so as to increase the flood control safety margin. When the scheme of constructing a tailing pond flood drainage system by further increasing flood control safety margin needs to be considered; in order to cope with flooding exceeding design standards, a well cluster system may be employed.
5) According to the actual operation requirement of a tailing pond, a plurality of drainage wells are required to be arranged, flood drainage, water return or seepage drainage functions are realized separately, and a well group system can be arranged.
In some embodiments, a plurality of drainage wells 2 may be evenly spaced around the center of the base 1, so that the force applied to the base 1 is more uniform.
Specifically, the base 1 has a cylindrical shape, and the center of the base 1 can be regarded as the position of the axis of the base 1.
In some embodiments, the drainage wells 2 may be of the same type, such as all frame-type drainage wells, or all window-type drainage wells, etc.
In other embodiments, at least some of the drainage wells 2 are of different types, such as one or more of the drainage wells being framed and one or more of the drainage wells being windowed.
Taking fig. 1 as an example for specific explanation, the drainage wells 2 are configured into two, wherein one drainage well 2 is an existing frame-type drainage well, and the other drainage well 2 is an existing window-type drainage well, which can simultaneously meet the independent drainage requirements of multiple functions such as flood drainage, seepage drainage, water return and the like of the tailing pond.
Specifically, one of the operating conditions is: the frame-type drainage well has a large water inlet section and high drainage capacity, so that the flood drainage requirement in a tailing reservoir in the flood season can be met; the window type drainage well is used for meeting the requirement of daily water return in a reservoir or the requirement of reservoir water seepage guide and drainage due to small drainage capacity; the drainage wells 2 realizing different drainage functions work independently.
The frame-type drainage well comprises a prefabricated arch bar, frame upright columns and ring beams, wherein a space formed by connecting the upright columns and the arch bar is used as a water inlet cavity. The window type drainage well comprises a shaft, wherein the shaft is provided with a drainage window, and a concrete plug can be used for plugging the drainage window.
As shown in fig. 1 to 3, the drainage wells 2 may be configured as two, three, four, five, etc., and the number thereof may be selected as needed.
In some embodiments, as shown in fig. 2 to 4, the heights of the drainage wells 2 may be consistent, so that different drainage wells 2 mainly play a role in increasing the drainage capacity when operating at the same elevation, realizing mutual replacement of headframes, or increasing the flood drainage safety margin of the tailings pond.
When the tailing pond encounters low-level flood, and drainage of a single drainage well 2 can meet the drainage capacity requirement, one drainage well 2 can be used for drainage, and the rest drainage wells 2 can be used as standby drainage wells 2 of the drainage well 2; the drainage well group well construction scheme realizes one-use one-standby (as shown in figure 2), two-standby (as shown in figure 3) or multiple-standby (as shown in figure 4); when the flood meets the heavy rain and flood, the single drainage well 2 is difficult to meet the requirement of flood discharge capacity, and the multiple drainage wells 2 realize the simultaneous water inflow and flood discharge at the same elevation so as to meet the safety requirement of flood discharge; when encountering extra-large flood exceeding the flood prevention standard, the spare drainage well is started to meet the requirement of smooth and safe flood discharge.
It should be noted that when a plurality of drainage wells 2 in the well group system are simultaneously filled with water, the inner diameters, the models and the drainage capacities of the drainage wells 2 can be consistent or inconsistent, and the specific section size design can be carried out according to the actual drainage capacity requirements of each stage of the tailing pond.
In some other embodiments, as shown in fig. 5 to 9, at least some of the drainage wells 2 have different heights, which can meet the requirement of continuous flood drainage in a specific elevation stage (or a full service period elevation stage) of the tailings pond.
In at least one embodiment, as shown in FIG. 9, the height of each drainage well 2 is not uniform.
On the basis of the above-mentioned embodiments, as shown in fig. 10, each drainage well 2 comprises a derrick 21, a bottom end of the derrick 21 of at least one drainage well is connected with a shaft 22, and a bottom end of the shaft 22 is installed on the base 1. The shaft 22 can meet the firm connection between the upper derrick 21 and the base 1, water does not enter the full section of the shaft 22, the shaft 22 is hollow to meet the water drainage requirement, and the wall thickness of the shaft 22 is thick, solid and firm to meet the structural safety requirement.
Specifically, when the heights of at least some of the drainage wells 2 are not uniform, the lowest drainage well 2 does not include the shaft 22, the head frame 21 is directly mounted on the base 1, and the remaining drainage wells 2 include the head frame 21 and the shaft 22 connected to the bottom end of the head frame 21.
The following is specifically described by taking fig. 10 as an example: when the tailing pond operates in the whole period, the flood drainage elevation stage is h 0 To h 3 (ii) a In a cluster well arrangement: the first mast 211 is arranged with a total height h 1 +δH-h 0 Which can satisfy h 0 To (h) 1 + δ H) flood discharge requirements between elevations; the second derrick 212 is set to have a total height h 2 +δH-h 1 Then h is satisfied 1 To (h) 2 + δ H) flood discharge requirements between elevations; third derrick 213 is set to have total height h 3 -h 2 Then h is satisfied 2 To h 3 Flood drainage needs between elevations. In the arrangement scheme, the headframes 21 of different drainage wells 2 are overlapped in height, so that the headframe 21 of the previous headframe 21 is completed by utilizing the overlapping height between the two headframes 21 before the headframe 21 of the next drainage well 2 is startedPlugging work (the derrick is not used after plugging).
Wherein, δ H is the lap joint height between the headframes 21 of different drainage wells 2, and the lap joint height can be 1-3m generally.
Since the headframes 21 in the drainage wells 2 are connected to the common base 1, the top level of the base 1 is assumed to be h 0 Then, for the second derrick 212 and the third derrick 213, the bottom of the second derrick 212 has a second shaft 221, the bottom of the third derrick 213 has a third shaft 222, the bottoms of the second shaft 221 and the third shaft 222 are connected to the base 1, and the height of the second shaft 221 is h 1 The third well bore 222 has a height h 2 。
In some embodiments, as shown in fig. 11 and 12, the drainage channel 11 includes a vertical drainage channel 113, a plurality of horizontal drainage channels 114, and a plurality of vertical energy dissipation channels 115, the plurality of vertical energy dissipation channels 115 are communicated with the vertical drainage channel 113 through the plurality of horizontal drainage channels 114 in a one-to-one correspondence, a top of each vertical energy dissipation channel 115 has a water inlet 112, and a side of the vertical drainage channel 113 is communicated with the drainage outlet 111.
In use, water in each drainage well 2 first enters the vertical energy dissipating channels 115 through the respective bottom water inlet 112, then merges from each transverse drainage channel 114 to the vertical drainage channel 113 and finally exits through the drainage openings 111 to the sides of the vertical drainage channel 113.
The drainage channels 11 can be used as a water storage space, an energy dissipation channel, a connecting channel and a water outlet channel of the drainage body of each drainage well 2.
Specifically, the vertical energy dissipation channel 115 may serve as a water storage space for collecting a water body into which a derrick of the upper drainage well 2 converges; the bottom of the vertical energy dissipation channel 115 is provided with an energy dissipation pit 1151 for fully dissipating the energy of the flood with large flow and high fall at the upper part through the energy dissipation pit 1151 at the lower part.
The energy dissipation pit 1151 may have a cylindrical shape as shown in fig. 12, or may have a spherical shape.
In some embodiments, the bottom end of the vertical energy-dissipating channel 115 is 1.0-1.5m lower than the bottom end of the lateral drainage channel 114 communicating therewith, thereby forming an energy-dissipating pit 1151 at the bottom end of the vertical energy-dissipating channel 115.
Flood in each derrick is fully dissipated by the energy dissipation pit 1151, stored in the vertical energy dissipation channel 115, discharged into the common vertical drainage channel 113 through the horizontal drainage channel 114, and then discharged into a drainage tunnel or culvert connected to the rear through the drainage port 111 communicated with the vertical drainage channel 113.
As shown in fig. 12, the vertical drainage channel 113 is communicated with the drainage port 111 through a horizontal communication channel 116 formed in the base 1
The lateral communication passage 116 preferably communicates with the bottom of the vertical drainage passage 113.
The above-mentioned lateral direction is understood to be a direction parallel to the horizontal direction, and the above-mentioned vertical direction is understood to be a direction perpendicular to the horizontal direction.
In some embodiments, to facilitate drainage of floodwater, the bottom end of the vertical drainage channels 113 is lower than the bottom end of each of the lateral drainage channels 114.
The dimensions of the vertical drainage channel 113, the horizontal drainage channel 114, the vertical energy dissipation channel 115 and the horizontal communication channel 116 are designed to be different sectional dimensions according to the requirements of the drainage capacity and the use of the use function.
Of course, the drain channel 11 may have other channel structures. For example: the drainage channel 11 includes a plurality of vertically arranged branch channels, one end of each of which can be regarded as a water inlet 112, and the other end thereof communicates with the main drainage channel, and a transversely arranged main drainage channel, one end of which away from each of the branch channels can be regarded as a water outlet 111.
The embodiment of the second aspect of the utility model provides a flood drainage system, the utility model discloses the flood drainage system that the embodiment of the second aspect provided includes above-mentioned tailing storehouse drainage well crowd.
The utility model discloses the flood drainage system that the second aspect provided has the utility model discloses the tailing storehouse drainage well crowd that the embodiment of the first aspect provided, thereby have the utility model discloses all beneficial effect that the tailing storehouse drainage well crowd that the embodiment of the first aspect provided had.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a tailing storehouse drainage well crowd, its characterized in that includes base (1) and a plurality of drainage well (2), each drainage well (2) install in the top of base (1), drainage channel (11) have in base (1), drainage channel (11) have a drain outlet (111) and with a plurality of water inlet (112) that drainage well (2) enclosed space one-to-one communicate, drain outlet (111) and each water inlet (112) intercommunication.
2. A tailings pond drainage well cluster according to claim 1, characterized in that the drainage wells (2) are of the same type or at least some of the drainage wells (2) are of different types.
3. The tailings pond drainage well cluster according to claim 2, characterized in that the drainage wells (2) are configured in two, one of the drainage wells (2) being a framed drainage well and the other drainage well (2) being a window drainage well.
4. A tailings pond drainage well group according to claim 1, characterized in that the height of each drainage well (2) is uniform, or at least some of the drainage wells (2) are non-uniform.
5. The tailings pond drainage well group according to claim 4, characterized in that the drainage wells (2) are configured in two, three or four, and the height of each drainage well (2) is uniform or the height of each drainage well (2) is not uniform.
6. A tailings pond drainage well cluster according to claim 1, characterized in that the drainage channel (11) comprises a vertical drainage channel (113), a plurality of transverse drainage channels (114) and a plurality of vertical energy dissipation channels (115), the plurality of vertical energy dissipation channels (115) are communicated with the vertical drainage channel (113) through the plurality of transverse drainage channels (114) in a one-to-one correspondence manner, the top of each vertical energy dissipation channel (115) is provided with the water inlet (112), and the side of the vertical drainage channel (113) is communicated with the water outlet (111).
7. A tailings pond drainage well cluster according to claim 6, characterized in that the bottom end of the vertical energy-dissipating channel (115) is 1.0-1.5m lower than the bottom end of the transverse drainage channel (114) communicating therewith.
8. A tailings pond drainage well cluster according to claim 6, characterized in that the bottom end of the vertical drainage channel (113) is lower than the bottom end of each of the lateral drainage channels (114).
9. A tailings pond drainage well cluster according to any of claims 1 to 8, characterized in that a plurality of the drainage wells (2) are evenly spaced around the centre of the foundation (1).
10. A flood drainage system comprising a tailings pond drainage well cluster as claimed in any one of claims 1 to 9.
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| CN202223320937.6U CN218667829U (en) | 2022-12-09 | 2022-12-09 | Drainage well group and flood drainage system for tailing pond |
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| CN202223320937.6U CN218667829U (en) | 2022-12-09 | 2022-12-09 | Drainage well group and flood drainage system for tailing pond |
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