CN115419011A - Flood prevention device for transformer substation gate - Google Patents
Flood prevention device for transformer substation gate Download PDFInfo
- Publication number
- CN115419011A CN115419011A CN202211053564.2A CN202211053564A CN115419011A CN 115419011 A CN115419011 A CN 115419011A CN 202211053564 A CN202211053564 A CN 202211053564A CN 115419011 A CN115419011 A CN 115419011A
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- Prior art keywords
- flood prevention
- wall
- base
- connecting hole
- prevention device
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/10—Dams; Dykes; Sluice ways or other structures for dykes, dams, or the like
- E02B3/106—Temporary dykes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/10—Dams; Dykes; Sluice ways or other structures for dykes, dams, or the like
- E02B3/106—Temporary dykes
- E02B3/108—Temporary dykes with a filling, e.g. filled by water or sand
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/02—Sediment base gates; Sand sluices; Structures for retaining arresting waterborne material
- E02B8/023—Arresting devices for waterborne materials
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B2009/007—Flood panels
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Architecture (AREA)
- Barrages (AREA)
Abstract
The invention discloses a flood prevention device for a transformer substation gate. A first groove is formed in the inner wall of the base, and a flood prevention main body is arranged on the inner wall of the first groove. Through setting up the base, first recess, the second recess, first screw hole, the second screw hole, the threaded rod, first knob, a telescopic cylinder, flexible subassembly, spring and flood prevention main part, when water strikes to this device, flood prevention main part begins to remove in the second recess, flexible subassembly and spring also receive the extrusion simultaneously, flexible subassembly and spring can be in very short time this moment, control waterproof baffle resumes the stable state of demand, reduce rivers to flood prevention device's impact force, thereby avoid being hit by the impact of rivers, simultaneously through setting up impact force and first knob, when the threaded rod supports to go into in first connecting hole and the second connecting hole, accomplish the connection process to flood prevention main part and base, guarantee the stability of flood prevention main part simultaneously.
Description
Technical Field
The invention belongs to the technical field of flood prevention of transformer substations, and particularly relates to a flood prevention device for a transformer substation gate.
Background
The transformer substation is a place for converting voltage and current, receiving electric energy and distributing electric energy in an electric power system. The substations in the power plant are step-up substations, which are used to boost up the electrical energy generated by the generator and feed it into the high-voltage network.
In the prior art, the water flow is blocked by sand bags in common devices, and the water flow is buffered, but the sand bags are heavy, and certain difficulty is caused in the carrying process, and meanwhile, the conventional flood prevention device has a flood prevention function, but is lack of a buffer structure, has poor stamping force and is easy to flush down, so that the flood prevention device for the transformer substation gate is required to solve the problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a flood prevention device for a transformer substation gate, and aims to solve the technical problems that in the prior art, sand bags are used for blocking water flow and have a buffering effect on the water flow, but the sand bags are heavier, so that certain difficulty is caused in the carrying process, and meanwhile, the conventional flood prevention device has a flood prevention function, but lacks a buffering structure, has poor stamping force and is easy to flush the device.
In order to achieve the purpose, the invention is realized by the following technical scheme: the flood prevention device for the transformer substation gate comprises a base, wherein a first groove is formed in the inner wall of the base, a flood prevention main body is arranged on the inner wall of the first groove, a second groove is formed in the inner wall of the flood prevention main body, a telescopic cylinder is fixedly connected to the inner wall of the second groove, a first connecting hole is formed in the inner wall of the flood prevention main body, a second connecting hole is formed in the inner wall of the base, and a filter plate is fixedly connected to the front side of the base.
As a preferred technical scheme, a telescopic assembly is arranged on the inner wall of the telescopic cylinder, and one end of the telescopic assembly is fixedly connected with a waterproof baffle.
As a preferable technical scheme of the invention, a threaded rod is arranged on the inner wall of the first connecting hole, and one end of the threaded rod is fixedly connected with a first knob.
As the preferable technical scheme of the invention, the inner wall of the filter plate is provided with a placing hole.
As a preferred technical scheme of the invention, the surface of the telescopic cylinder is sleeved with a spring.
As a preferable technical scheme of the invention, the inner wall of the base is provided with a sponge, and the inner wall of the sponge is provided with a connecting pipe.
As a preferable technical scheme of the invention, the inner walls of the second connecting holes are provided with threaded rods, and the number of the telescopic cylinders is four.
As a preferred technical scheme of the invention, the surface of the connecting pipe is sleeved with a second knob, and the inner wall of the second knob is sleeved with a filter screen.
The invention provides a flood prevention device for a transformer substation gate, which has the following beneficial effects:
1. through setting up the base, first recess, the second recess, first screw hole, the second screw hole, the threaded rod, first knob, telescopic cylinder, flexible subassembly, spring and flood prevention main part, when water strikes to this device, flood prevention main part begins to remove in the second recess, flexible subassembly and spring also receive the extrusion simultaneously, flexible subassembly and spring can be in very short time this moment, control waterproof baffle resumes the stable state of demand, reduce rivers to flood prevention device's impact force, thereby avoid being hit by rivers, through setting up threaded rod and first knob simultaneously, when the threaded rod supports into first connecting hole and second connecting hole, accomplish the connection process to flood prevention main part and base, guarantee the stability of flood prevention main part simultaneously.
2. Through setting up base, sponge, filter, connecting hole, connecting pipe, second knob and filter screen, after the completion is to the equipment of this device, the hole inflow was placed to the rivers accessible in the sponge, and the sponge begins to absorb moisture in the base this moment, and the weight that increases the base makes flood prevention main part more stable when using, prevents simultaneously through the filter screen that impurity in the rivers from entering into the connecting pipe, makes it take place to block up, influences drainage process.
Drawings
Fig. 1 is a perspective view of a flood prevention device structure for a gate of a transformer substation according to the present invention;
fig. 2 is an explosion diagram of a flood prevention main body structure of a flood prevention device for a transformer substation gate according to the present invention;
fig. 3 is a schematic structural diagram of a flood prevention device sponge for a gate of a transformer substation according to the present invention;
fig. 4 is a schematic structural diagram of a flood prevention device telescopic cylinder for a transformer substation gate according to the present invention.
In the figure: 1. a base; 2. a filter plate; 3. placing holes; 4. a first groove; 5. a flood prevention main body; 6. a second groove; 7. a telescopic cylinder; 8. a telescoping assembly; 9. a spring; 10. a waterproof baffle; 11. a first connection hole; 12. a second connection hole; 13. a threaded rod; 14. a first knob; 15. a sponge; 16. a connecting pipe; 17. a second knob; 18. and (4) a filter screen.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like 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 should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 4, the present invention provides a technical solution: the utility model provides a flood prevention device for transformer substation's gate, including base 1, first recess 4 has been seted up to the inner wall of base 1, through setting up first recess 4, realize the process of placing flood prevention main part 5, the inner wall of first recess 4 is provided with flood prevention main part 5, second recess 6 has been seted up to the inner wall of flood prevention main part 5, through setting up second recess 6, accomplish placing telescopic cylinder 7, the inner wall fixedly connected with telescopic cylinder 7 of second recess 6, first connecting hole 11 has been seted up to the inner wall of flood prevention main part 5, second connecting hole 12 has been seted up to the inner wall of base 1, through setting up first connecting hole 11 and second connecting hole 12, when threaded rod 13 when moving to first connecting hole 11 and second connecting hole 12 interior levelling, realize the process of connecting flood prevention main part 5 and base 1, the positive fixedly connected with filter 2 of base 1.
Furthermore, the inner wall of telescopic cylinder 7 is provided with telescopic assembly 8, and the one end fixedly connected with waterproof baffle 10 of telescopic assembly 8 through setting up waterproof baffle 10, can block effect to rivers.
Further, the inner wall of the first connecting hole 11 is provided with a threaded rod 13, through setting up the threaded rod 13, when the threaded rod 13 completely supports into the first connecting hole 11 and the second connecting hole 12, the installation process of the flood prevention main body 5 is completed, one end of the threaded rod 13 is fixedly connected with a first knob 14, through setting up the first knob 14, when controlling the first knob 14 to rotate, the threaded rod 13 also rotates synchronously.
Further, the inner wall of the filter plate 2 is provided with a placing hole 3, and the placing hole 3 is arranged, so that the process that water flows into the base 1 is realized.
Further, the surface of telescopic tube 7 has cup jointed spring 9, and through setting up spring 9, in the very twinkling of an eye that waterproof baffle 10 received the impact, spring 9 accessible telescopic assembly 8 controls that waterproof baffle 10 is quick to get back to stable state.
Further, the inner wall of base 1 is provided with sponge 15, and through setting up sponge 15, when water entered into base 1 in, sponge 15 began to absorb the effect to the water in the base 1, aggravates the weight to base 1, makes flood prevention main part 5 more stable at the in-process that uses, and the inner wall of sponge 15 is provided with connecting pipe 16.
Furthermore, the inner walls of the second connecting holes 12 are provided with threaded rods 13, and the number of the telescopic cylinders 7 is four.
Further, the second knob 17 has been cup jointed on the surface of connecting pipe 16, and filter screen 18 has been cup jointed to the inner wall of second knob 17, and through setting up second knob 17 and filter screen 18, when second knob 17 accomplished the rotation on the surface of connecting pipe 16, the realization and connecting pipe 16's connection process, simultaneously through filter screen 18, can block the effect to the impurity in the rivers, avoid influencing connecting pipe 16's normal drainage process.
Example 2
Example 2 differs from example 1 in that: the utility model provides a flood prevention device for transformer substation gate, including base 1, first recess 4 has been seted up to the inner wall of base 1, through setting up first recess 4, realize the process of placing flood prevention main part 5, the inner wall of first recess 4 is provided with flood prevention main part 5, second recess 6 has been seted up to the inner wall of flood prevention main part 5, through setting up second recess 6, accomplish placing telescopic cylinder 7, the inner wall fixedly connected with telescopic cylinder 7 of second recess 6, first connecting hole 11 has been seted up to the inner wall of flood prevention main part 5, second connecting hole 12 has been seted up to the inner wall of base 1, through setting up first connecting hole 11 and second connecting hole 12, when threaded rod 13 moves to first connecting hole 11 and second connecting hole 12 interior levelling, realize the process of connecting flood prevention main part 5 and base 1, the front fixedly connected with filter 2 of base 1, furthermore, the inner wall of telescopic cylinder 7 is provided with telescopic assembly 8, the one end fixedly connected with waterproof baffle 10 of telescopic assembly 8, through setting up waterproof baffle 10, can block the effect to rivers. The inner wall of first connecting hole 11 is provided with threaded rod 13, and through setting up threaded rod 13, when threaded rod 13 complete the support go into in first connecting hole 11 and the second connecting hole 12, the completion is to flood prevention main part 5's installation, and the first knob 14 of one end fixedly connected with of threaded rod 13, through setting up first knob 14, when controlling first knob 14 and rotate, threaded rod 13 also rotates in step. The inner wall of filter 2 has been seted up and has been placed hole 3, places hole 3 through the setting, realizes rivers and enters into the process in the base 1. The surface of telescopic tube 7 has cup jointed spring 9, and through setting up spring 9, in the very twinkling of an eye that waterproof baffle 10 received the impact, spring 9 accessible telescopic assembly 8 controls the quick steady state that gets back to of waterproof baffle 10. The inner wall of base 1 is provided with the inflation ball that absorbs water, through setting up the inflation ball that absorbs water, when water entered into base 1 in, the inflation ball that absorbs water begins to absorb the effect to the water in the base 1, aggravates the weight to base 1, makes flood prevention main part 5 more stable at the in-process that uses, the inner wall of inflation ball that absorbs water is provided with connecting pipe 16. The inner wall of the second connecting hole 12 is provided with a threaded rod 13, and the number of the telescopic cylinders 7 is four. The surface of connecting pipe 16 has cup jointed second knob 17, and the filter screen 18 has been cup jointed to the inner wall of second knob 17, and through setting up second knob 17 and filter screen 18, when second knob 17 accomplished the rotation on the surface of connecting pipe 16, the realization and connecting pipe 16's connection process, simultaneously through filter screen 18, can block the effect to the impurity in the rivers, avoid influencing connecting pipe 16's normal drainage process.
The specific use mode and function of the embodiment are as follows: when the device is used, a worker can place the flood prevention main body 5 downwards through the direction of the first groove 4, at the moment, the threaded rod 13 can be controlled to move horizontally in the first connecting hole 11 and the second connecting hole 12 through the first knob 14, when the threaded rod 13 completely enters the first connecting hole 11 and the second connecting hole 12, connection between the flood prevention main body 5 and the base 1 is completed, through the arrangement of the sponge 15, when water flow enters the base 1, the sponge 15 starts to absorb water in the base 1, the weight of the base 1 is increased, the possibility that the base 1 is unstable and is knocked down is avoided when the flood prevention main body 5 is impacted by the water flow, meanwhile, under the use of the telescopic cylinder 7, the telescopic assembly 8 and the spring 9, when the flood prevention main body 5 is impacted, the spring 9 can enable the telescopic assembly 8 to quickly recover to a stable state, a buffering effect is effectively achieved, and when the water flow flows into the connecting pipe 16, the filter 18 can filter impurities in the water flow, and the normal drainage process of the connecting pipe 16 is prevented from being influenced.
Overall, the technical problem is addressed: in the prior art, the common device blocks water flow by sand bags and performs a buffering effect on the water flow, but the sand bags are heavy, so that certain difficulty is caused in the carrying process, and meanwhile, the conventional flood prevention device has a flood prevention function, but is lack of a buffering structure, has poor stamping force and is easy to flush down, so that the flood prevention device for the substation gate is required to solve the problems;
the technical scheme is as follows: a flood prevention device for a transformer substation gate comprises a base 1, wherein a first groove 4 is formed in the inner wall of the base 1, the flood prevention main body 5 is placed through the first groove 4, a flood prevention main body 5 is arranged on the inner wall of the first groove 4, a second groove 6 is formed in the inner wall of the flood prevention main body 5, the telescopic cylinder 7 is placed through the second groove 6, the telescopic cylinder 7 is fixedly connected to the inner wall of the second groove 6, a first connecting hole 11 is formed in the inner wall of the flood prevention main body 5, a second connecting hole 12 is formed in the inner wall of the base 1, the first connecting hole 11 and the second connecting hole 12 are arranged, when a threaded rod 13 moves horizontally into the first connecting hole 11 and the second connecting hole 12, the flood prevention main body 5 and the base 1 are connected, and a filter plate 2 is fixedly connected to the front side of the base 1;
the implementation process of the technical scheme is as follows: when the device is used, a worker can place the flood prevention main body 5 downwards in the direction of the first groove 4, at the moment, the threaded rod 13 can be controlled to horizontally move in the first connecting hole 11 and the second connecting hole 12 through the first knob 14, when the threaded rod 13 completely enters the first connecting hole 11 and the second connecting hole 12, the connection between the flood prevention main body 5 and the base 1 is completed, sponge 15 starts to absorb moisture in the base 1 by arranging sponge when water flow enters the base 1, the weight of the base 1 is increased, the possibility that the base 1 is unstable and is knocked down when the flood prevention main body 5 is impacted by the water flow is prevented, meanwhile, under the matched use of the telescopic cylinder 7, the telescopic assembly 8 and the spring 9, the spring 9 can enable the telescopic assembly 8 to quickly recover to a stable state at the moment when the flood prevention main body 5 is impacted, the buffering effect is effectively achieved, and meanwhile, when the water flow flows into the connecting pipe 16, the filter screen 18 can filter impurities in the water flow, and the normal drainage process of the connecting pipe 16 is prevented from being affected;
therefore, the technical problem can be solved certainly, and the technical effects are as follows: by arranging the base, the first groove, the second groove, the first threaded hole, the second threaded hole, the threaded rod, the first knob, the telescopic cylinder, the telescopic assembly, the spring and the flood prevention main body, when water impacts the device, the flood prevention main body starts to move in the second groove, and the telescopic assembly and the spring are simultaneously extruded, so that the telescopic assembly and the spring can be controlled to be restored to a required stable state within a short time, the impact force of the water flow on the flood prevention device is reduced, the flood prevention device is prevented from being collided by the water flow, and meanwhile, by arranging the impact force and the first knob, when the threaded rod abuts against the first connecting hole and the second connecting hole, the connecting process of the flood prevention main body and the base is completed, and meanwhile, the stability of the flood prevention main body is guaranteed; through setting up base, sponge, filter, connecting hole, connecting pipe, second knob and filter screen, after the completion is to the equipment of this device, the hole inflow was placed to the rivers accessible in the sponge, and the sponge begins to absorb moisture in the base this moment, and the weight that increases the base makes flood prevention main part more stable when using, prevents simultaneously through the filter screen that impurity in the rivers from entering into the connecting pipe, makes it take place to block up, influences drainage process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a flood prevention device for transformer substation's gate, includes base (1), its characterized in that: first recess (4) have been seted up to the inner wall of base (1), the inner wall of first recess (4) is provided with flood prevention main part (5), second recess (6) have been seted up to the inner wall of flood prevention main part (5), the inner wall fixedly connected with telescopic tube (7) of second recess (6), first connecting hole (11) have been seted up to the inner wall of flood prevention main part (5), second connecting hole (12) have been seted up to the inner wall of base (1), the positive fixedly connected with filter (2) of base (1).
2. The flood prevention device for the substation gate according to claim 1, characterized in that: the inner wall of a telescopic cylinder (7) is provided with a telescopic assembly (8), and one end of the telescopic assembly (8) is fixedly connected with a waterproof baffle (10).
3. The flood prevention device for the substation gate according to claim 1, characterized in that: the inner wall of first connecting hole (11) is provided with threaded rod (13), the one end fixedly connected with first knob (14) of threaded rod (13).
4. The flood prevention device for the substation gate according to claim 1, characterized in that: the inner wall of the filter plate (2) is provided with a placing hole (3).
5. The flood prevention device for the substation gate according to claim 1, characterized in that: and the surface of the telescopic cylinder (7) is sleeved with a spring (9).
6. The flood prevention device for the substation gate according to claim 1, characterized in that: the inner wall of base (1) is provided with sponge (15), the inner wall of sponge (15) is provided with connecting pipe (16).
7. A flood prevention device for a substation gate according to claim 1, characterized in that: the inner wall of the second connecting hole (12) is provided with a threaded rod (13), and the number of the telescopic cylinders (7) is four.
8. The flood prevention device for the substation gate according to claim 6, characterized in that: and a second knob (17) is sleeved on the surface of the connecting pipe (16), and a filter screen (18) is sleeved on the inner wall of the second knob (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211053564.2A CN115419011A (en) | 2022-08-31 | 2022-08-31 | Flood prevention device for transformer substation gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211053564.2A CN115419011A (en) | 2022-08-31 | 2022-08-31 | Flood prevention device for transformer substation gate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115419011A true CN115419011A (en) | 2022-12-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211053564.2A Pending CN115419011A (en) | 2022-08-31 | 2022-08-31 | Flood prevention device for transformer substation gate |
Country Status (1)
| Country | Link |
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| CN (1) | CN115419011A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008002195A (en) * | 2006-06-23 | 2008-01-10 | Shunichi Oda | Flood damage preventing device |
| CN211340655U (en) * | 2019-12-05 | 2020-08-25 | 曲阜大禹水利工程有限公司 | Road temporary flood prevention device for hydraulic engineering |
| CN212000887U (en) * | 2019-12-13 | 2020-11-24 | 冀浩 | Slope protection for antiseep water conservancy flood control |
| CN216689225U (en) * | 2021-12-17 | 2022-06-07 | 马鲁军 | Flood prevention device for hydraulic engineering |
-
2022
- 2022-08-31 CN CN202211053564.2A patent/CN115419011A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008002195A (en) * | 2006-06-23 | 2008-01-10 | Shunichi Oda | Flood damage preventing device |
| CN211340655U (en) * | 2019-12-05 | 2020-08-25 | 曲阜大禹水利工程有限公司 | Road temporary flood prevention device for hydraulic engineering |
| CN212000887U (en) * | 2019-12-13 | 2020-11-24 | 冀浩 | Slope protection for antiseep water conservancy flood control |
| CN216689225U (en) * | 2021-12-17 | 2022-06-07 | 马鲁军 | Flood prevention device for hydraulic engineering |
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