EP3974592A1

EP3974592A1 - Drainage system

Info

Publication number: EP3974592A1
Application number: EP21199443.9A
Authority: EP
Inventors: Jan Eriksen
Original assignee: Dannozzle Holding New Aps
Current assignee: Dannozzle Holding New Aps
Priority date: 2020-09-29
Filing date: 2021-09-28
Publication date: 2022-03-30

Abstract

The invention relates to the technical field of flap/flush gates, particularly to a drainage system (1)for opening and closing the discharge end of outlet pipes (6). It is an object of the invention to provide a drainage system (1) and a method, which leads to an efficient and agile installation to work in, when doing repairs, maintains or replacement of parts in a drainage system. The present invention addresses this by providing a drainage system (1) comprising:
- a reservoir (2), having an inlet opening and at least one outlet opening (11),
- a flap gate (4) arranged on the inner side of the reservoir (2) capable of covering the inlet opening, when the flap gate (4) is arranged in a closed position, and when the flap gate is in an open position, water is capable of running into the reservoir,
- at least one gate valve arranged relative to said at least one outlet opening (11), such that said at least one gate valve is capable of covering said at least one outlet opening, when the gate valve is arranged in a closed position, and when the gate valve is in an open position, water is capable of running out of the reservoir through the at least one outlet opening,
- at least one outlet pipe (6) having a first end opening and a second end opening, wherein the first end opening is arranged in fluid connection to the at least one outlet opening (11) in the reservoir (2),
- a flush gate (7) arranged relative to said at least one outlet pipe's (6) second end opening where the flush gate (7) is capable of covering said second end opening, when the flush gate is arranged in a closed position, and when the flush gate is in an open position, water is capable of running out of the at least one outlet pipe 's second end opening.

Description

Field of the Invention

The invention relates to the technical field of flap/flush gates, particularly to drainage system for opening and closing the discharge end of outlet pipe s.

Background of the Invention

Flap gates and/or flush gates may be designed to provide a closure on the discharge end of an outlet pipe or outlet pipe s to prevent drainage systems from flooding as well as to keep small animals from entering any outlet pipe system. Farmers, land developers, the mining industry and municipalities normally use flap gates and/or flush gates to control surface waters by enabling the management of water flow in a variety of situations. Basically, a differential pressure between the rear and the front of the flap gate causes the flap gate to automatically open and close, thus allowing discharge through levees/sewer lines/drainage conduits/etc. and, at the same time, preventing backflow.
Current flap gates and/or flush gates may easily be worn out, thereby becoming ineffective, due to the weather conditions and the fluids that the flap gate comes into contact with that splashes and pushes on the other side of the flap gate, for example if rain water from the houses to be discharged through the one side of the flap gate and/or flush gates in the ocean and salt water from the ocean's waves and streams. The discharge outlet pipe can be partially or completely under water.
Problems also occur, when the outlet pipe s and/or the gates need to be repaired, maintained or replaced. The water flowing in the systems cannot easily be stopped. This will complicate the work which has to be done, and therefore the workers must seek to expensive and massive measures, which may be required before working on the drainage system.

Object of the Invention

It is an object of the invention to provide a drainage system and a method, which leads to an efficient and agile installation to work in, when doing repairs, maintains or replacement of parts in a drainage system.

Description of the Invention

The present invention addresses this by providing a drainage system comprising:

a reservoir, having an inlet opening and at least one outlet opening,
a flap gate arranged on the inner side of the reservoir capable of covering the inlet opening, when the flap gate is arranged in a closed position, and when the flap gate is in an open position, water is capable of running into the reservoir,
at least one outlet pipe having a first end opening and a second end opening, wherein the first end opening is arranged in fluid connection to the at least one outlet opening in said reservoir,
a flush gate arranged relative to said at least one outlet pipe's second end opening where the flush gate is capable of covering said second end opening, when the flush gate is arranged in a closed position, and when the flush gate is in an open position, water is capable of running out of the at least one outlet pipe's second end opening.

The drainage system comprises a reservoir having a volume where the water may be accumulated. The water may instead be or comprise any fluid material or liquid substance. The shape of the reservoir may be different from one drainage system to another drainage system. The shape may be similar to a square or be provided with a plurality of sides, or even cylindrical. The reservoir has an inlet opening wherein a flap gate is arranged on the inner side of the reservoir. The flap gate may be capable of covering the entire inlet opening, when the flap gate is arranged in a closed position. When the flap gate is in an open position or partially open position, the water is capable of running into the reservoir through the inlet opening. The water may then be accumulated inside the reservoir. The bottom of the reservoir may be slightly sloped, such that the water automatically will run away from the inlet opening.
The outlet pipe has a first end opening arranged adjacent to the outer side of the reservoir. The outlet pipe is in fluid connection with the outlet opening in the reservoir. The outlet pipe is attached to the outlet opening. The flush gate is arranged relative to the outlet pipe 's second end opening. A flush gate is capable of covering the second end opening of an outlet pipe, when the flush gate is in a closed position. When the flush gate moves into an open position or partially open position, water accumulated in the reservoir is capable of running out through the outlet pipe. The outlet pipe may be sloped such that the water may run towards the flush gate and easily out of the outlet pipe.
The diameter of the inlet opening may be larger the outlet openings and the outlet pipes. The water may easily be led into the reservoir. The water pressure thought the outlet pipes is used to keep the outlet piping system clear such that the outlet piping system do not clogged. The water in the reservoir provides a pressure, which ensures a high water pressure through the outlet pipes. When closing one or more outlet pipes the water pressure in the open outlet pipes will increase accordantly.
In an advantageous embodiment of the invention, at least one gate valve arranged relative to said at least one outlet opening, such that said at least one gate valve is capable of covering said at least one outlet opening, when the gate valve is arranged in a closed position, and when the gate valve is in an open position, water is capable of running out of said reservoir through the at least one outlet opening.
One or more gate valves may be arranged relative to the sidewall of the reservoir, such that each of the gate valves, if more, are capable of covering each of the outlet openings, when the gate valves are in a closed position. When each of the gate valves is arranged in an open position or partially open position, the water accumulated in the reservoir may easily run out through the outlet opening and through the outlet pipes. Some of the gate valves may be arranged in a closed position, while others is arranged in an open position. If the gate valves all are in a close position, the water is capable of being accumulated inside the reservoir. Accumulating the water in the reservoir is an advantage, which may be used for other purposes, such as fire pond, reservoir for temporary flooding, rain water accumulation which may later be used for watering greenhouses etc.
In a further advantageous embodiment of the invention, said at least one outlet pipe's second end opening is arranged on a first side of a gate barrier relative to an aperture in the barrier, wherein said flush gate is arranged on the second side of the gate barrier relative to said aperture in the barrier, wherein said flush gate is capable of covering said aperture in the barrier when the flush gate is arranged in a closed position, and when the flush gate is in an open position, water is capable of running out of the at least one outlet pipe's second end opening and through an aperture in the barrier.
One or more flush gates may be arranged relative to each of the one or more outlet pipe s second end opening through a gate barrier. The gate barrier is solid and therefore capable of stabilizing the position of the outlet pipe s relative to the reservoir and preventing the outlet pipe s from moving unintentional. The gate barrier may easily be built in a sloped edge of a basin or similar. A flush gate is capable of covering the second end opening of an outlet pipe, when the flush gates are all arranged in a closed position. The outlet pipe s second end openings are arranged on a first side of a gate barrier, relative to an aperture in the barrier. The flush gates are arranged on the second side of the gate barrier opposite to the first side, relative to the aperture in the barrier. Each of the flush gates may cover each of the apertures in the gate barrier, when the flush gates are arranged in a closed position. When the flush gates move into an open position or partially open position, then the water which is accumulated in the reservoir, is capable of running out through the outlet pipes and through the apertures in the barrier 9.
In a further advantageous embodiment of the invention, at least one ejector is arranged in the reservoir relative to the at least one outlet pipe's first end opening, wherein the at least one ejector is capable of ejecting water from the reservoir into said at least one outlet pipe, when the gate valve is arranged in an open position.
One or more ejectors may be arranged in the reservoir relative to one or more of the outlet pipes. The ejector is capable of ejecting water from the reservoir into outlet pipe s, if needed. This may be necessary to accelerate the flow of the water through the outlet pipe or outlet pipes. The ejectors may also be used for flushing the outlet pipes. If the flush gate is covered with mud or stones resting on the outside of the flush gate, the flush gate is unable to open freely. The water may be accumulated in the reservoir and with the use of the ejector the water pressure inside the outlet pipe towards the flush gate can be increased, such that the flush gate, which may be provided with one or more flush means, is capable of rapidly moving the mud or stones away from the flush gate. The function of the flush gate may then quickly be restored.
In a still further advantageous embodiment of the invention, a vertical position of said at least one ejector is adjustable.
The vertical position of the ejector may be adjustable using adjustable means. The ejector may easily be raised or lowered. The vertical position of the ejector may for example depend on the water level in the reservoir. This will increases the efficiency of the drainage system.
In a further advantageous embodiment of the invention, said vertically position of said at least one ejector is automatically adjustable using adjustable means.
The position of the ejector inside the reservoir may automatically be controlled from a distance using adjustment means, wherein the adjustment means may be a wired or a wireless remote control. The workers may easily raise or lower the ejector in the drainage system, when needed.
In a still further advantageous embodiment of the invention, said at least one gate valve's opening and closed position is automatically controlled using valve controlling means.
The open and closed position of the gate valve may automatically be controlled using valve controlling means. The controlling means may be a wired or a wireless remote control. The workers may easily close down or open the drainage system, when needed.
In a further advantageous embodiment of the invention, the drainage system comprises three outlet openings, wherein three outlet pipe s comprising substantially equal diameter and an equal predefined length, wherein the tree outlet pipes are arranged in a parallel position in a common vertically height relative to the reservoir.
The diameter of the outlet pipe may be the same as the outlet opening diameter. The outlet pipe s, if more, may be arranged parallel to each other and having an equal predefined length, if needed. The outlet pipes 6 are arranged in a common vertically heights relative to the reservoir 2, where the outlet pipe s 6 are lying in a substantially horizontal position. The outlet pipe s may be slightly sloped.
In a still further advantageous embodiment of the invention one or more nozzles is/are arranged in the outlet pipe, and the nozzles are in communication with a cavity of the outlet pipe, such that the one or more nozzles is/are capable of blowing water and/or gas into the outlet pipe.
A nozzle system may be provided with one or more nozzles arranged which is arranged in the outlet pipe, such that the nozzles are in communication with a cavity of the outlet pipe. Sand, soil or similar debris may pile up in the outlet pipe. This may cause the outlet pipe to either be more inefficient or even clog totally. To prevent the clogging of the outlet pipe, a nozzle system may be provided. The nozzle is capable of blowing water or gas into the outlet pipe. For example, the nozzle system may comprise a pipe which may be connected to the ejector, such that the water ejected from the ejector is led through the nozzle. The nozzle or nozzles may thereby provide a high pressure cleaning effect in the outlet pipe. The nozzle system may be an integrated part in the walls of the outlet pipe. The nozzle system or part of the nozzle system may be arranged on the outer side of the outlet pipe.
In a further advantageous embodiment of the invention, a jet of said nozzle is arranged in a predefined jet angle relative to the water flow in the outlet pipe.
The efficiency of the nozzles is important for the cleaning effect in the outlet pipe. In one embodiment, the ejector may be capable of ejecting water into the nozzle system. The water is forced through the nozzles and providing a jet. The jet from the nozzle pushes and/or vortices the sand, soil or similar debris, that is piled up in the outlet pipe, away from the bottom of the outlet pipe. The sand, soil or similar is then carried away from and out of the outlet pipe through the flush gates due to the water flow F₂ in the outlet pipe.
To ensure a high cleaning effect in the outlet pipe, the jet angle of the nozzle may be taken into consideration. The nozzle or nozzles may be arranged in the bottom part of the outlet pipe. Alternatively, the nozzle or nozzles may be arranged in the sides of the outlet pipe. The nozzle or nozzles may be arranged in a predefined distance to each other. The nozzle or nozzles may be arranged in a predefined distance to the flush gate and/ to the reservoir. The jet of the nozzle or nozzles may be provided in one or more predefined jet angle relative to the flow direction. For example some of the nozzles are arranged with one predefined jet angle and others may be arranged with other predefined jet angles. The nozzle or nozzles may preferably be arranged such that the cleaning effect in the outlet pipe is optimized and most efficient in the drainage system.
The water may be injected into the nozzle system. Alternative to the water, gas, such as air, may be pumped into the nozzle system, thereby providing a jet from nozzles which is based on gas. The water, or gas if chosen, is forced through the nozzles and providing a jet. The jet from the nozzle pushes and/or vortices the sand, soil or similar debris, that is piled up in the outlet pipe, away from the bottom of the outlet pipe. The sand, soil or similar is then carried away from and out of the outlet pipe through the flush gates due to the water flow F₂ in the outlet pipe.
In a still further advantageous embodiment of the invention, at least one equalizing pipe is arranged relative to the outlet pipe providing a communication between an inner side of the outlet pipe to and outer side of the outlet pipe, such that the equalizing pipes is capable of equalizing the pressure in the outlet pipe.
One embodiment may comprise equalizing pipes. The equalizing pipe or pipes are providing a communication between the inner side of the outlet pipe and the outer side of the outlet pipe through the outlet pipe wall. The pressure, which may be built up in the outlet pipe, for example when the nozzle system is activated and cleaning the outlet pipe, is released through the equalizing pipes. The equalizing pipe or pipes may be arranged in the top of the outlet pipe. Alternatively the equalizing pipe or pipes may be arranged in the side of the outlet pipe. The equalizing pipe or pipes may also be arranged both in the top and in the side of the outlet pipe.
In a still further advantageous embodiment of the invention, a controlling system in communication with at least one sensor arranged in a predefined position in the draining system, such that the sensor is capable of measuring the water and/or water flow.
A controlling system may be arranged to control the draining system. The controlling system may be provided with controlling means and measuring means. The controlling system may control the open and closed position of the gate valve. The gate valve may automatically be controlled using valve controlling means. The controlling system may control the position of the ejector inside the reservoir. The position of the ejector may automatically be controlled from a distance using adjustment means. The controlling means may be a wired or a wireless remote control.
Sensors may be arranged in a predefined position in the outlet pipe or pipes, used for measuring the water flow through the outlet pipe or pipes. Sensor or sensors may also be used to determine the amount of the sand and/or stones piling up in the outlet tube. Sensor or sensors may be arranged in a predefined position, such that the sensor is capable of measuring the water level in the reservoir. A control system may be provided to control the ejector. The control system may control the nozzle system. The control system may control the ejector and/or the nozzle system relative to the measurement from the sensors in the entire draining system. The control system may control the draining system, such that the draining system is optimized and most efficient in drainage water.
The present invention also provides a method for draining water using a drainage system, comprising steps:

proving said drainage system, and arranging an outlet pipe system in fluid connection with an inlet opening in a reservoir in said drainage system,
arranging a flap gate on the inner side of the reservoir in an open position, such that the water is capable of running into the reservoir,
arranging at least one gate valve in an open position relative to at least one outlet opening in said reservoir, such that the water is capable of running out of the reservoir through said at least one outlet opening,

The drainage system may be arranged in a position relative to an outlet pipe system or a sewer system or similar. The outlet pipe system or sewer system may be in fluid connection with an inlet opening in the reservoir of the drainage system. Flap gates are arranged on the inner side of the reservoir, preferably in an open position or partially open position, such that the water is capable of running into the reservoir. At least one gate valve is arranged in an open position or partially open position relative to the outlet opening or outlet openings in the reservoir, such that the water is capable of running from the reservoir, through the outlet opening or outlet openings.
An outlet pipe or outlet pipe s may be arranged so the water may be lead away from the reservoir. A first end opening and a second end opening provided in the outlet pipe, is arranged in fluid connection to the at least one outlet opening in the reservoir and a flush gate.
In an advantageous method of the invention comprising further step:

activating at least one ejector, such that the at least one ejector ejects the water from the reservoir out through the at least one outlet opening, while the at least one gate valve is in an open position.

At least one ejector may be activated, such that the at least one ejector ejects the water from the reservoir if needed. This may prevent the reservoir from unintentionally overflow and/or keeping the outlet pipe system cleaned out. Also, by forcing the water out of the reservoir, the reservoir capacity may be optimised, as it is not only gravitational forces influencing the water flow. The increased water speed in and after the ejector creates an under pressure upstream from the ejector. This under pressure is active in activating any sediments such as sand and the like, which in this manner will be suspended in the water and carried out through the outlet pipe.
In a further advantageous embodiment, a plurality of ejectors (8) are arranged along a periphery, superposed an inlet to one outlet pipe (6) such that the plurality of ejectors eject water into said outlet pipe (6), and where optionally each outlet pipe 6 is provided with a plurality of injectors (8) along the periphery of each outlet pipe (6). By arranging the ejectors along a periphery, for example of the outlet pipes inner periphery, a substantial mass of water is activated and brought to exit the outlet pipe. This in addition to remove sediments from the reservoir also creates a current which will flush sediments and/or sand away from the outlet opening which could otherwise block for the proper operation of the flush gate.
The invention has now been explained with reference to a few embodiments and methods, which have only been discussed in order to illustrate the many possibilities and varying design possibilities achievable with the drainage system according to the present invention.

Description of the Drawing

The embodiments of the invention are described in the following with reference to:

Fig. 1a,b: Showing an embodiment of a drainage system.
Fig. 2: Showing an embodiment of a drainage system in a cross sectional view.
Fig. 3: Showing an embodiment of a three gate valves arranged in a drainage system.
Fig. 4: Showing an embodiment of the barrier comprising three flush gates
Fig. 5: Showing an embodiment of a drainage system comprising a nozzle system for cleaning outlet pipes, and equalizing pipes for pressure equalization.
Fig. 6: showing a plurality of ejectors arranged along a periphery, for example an inner perimeter of an outlet pipe.

Detailed Description of the Invention

An embodiment of the invention is explained in the following detailed description. It is to be understood that the invention is not limited in its scope to the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or carried out in various ways.
Figs. 1a,b show an embodiment of a drainage system 1, wherein the drainage system comprises a reservoir 2 having a volume 3. The reservoir 2 has an inlet opening and three outlet openings. A flap gate 4 is arranged on the inner side of the reservoir 2 capable of covering the inlet opening, when the flap gate is arranged in a closed position, which is shown on fig. 1a. When the flap gate is in an open position, water is capable of running into the reservoir through the inlet opening.
Three gate valves are arranged relative to the sidewall of the reservoir 2, such that each of the gate valves is capable of covering each of the three outlet openings, when the gate valves are arranged in a closed position. When the gate valves are arranged in an open position, water is capable of running out from the reservoir through the outlet openings. The gate valves open or closed position may be automatically controlled using valve controlling means, not showed on fig. 1a,b.
Three outlet pipes 6 have each a first end opening arranged adjacent to the outer side of the reservoir 2 and in fluid connection with the outlet openings in the reservoir 2. The diameter of the outlet pipes 6 are the same diameter for all the three outlet pipe s 6, and the outlet pipe s are arranged parallel to each other and having an equal predefined length. The outlet pipes 6 are arranged in a common vertically height relative to the reservoir 2, where the outlet pipes 6 are lying in a substantially horizontal position.
Three flush gates 7 are arranged relative to each of the three outlet pipe 's 6 second end opening. A flush gate is capable of covering the second end opening of an outlet pipe 6. The flush gates are all arranged in a closed position. The outlet pipe s 6 second end openings are arranged on a first side of a gate barrier 9 relative to an aperture in the barrier 9. The flush gates are arranged on the second side of the gate barrier 9 opposite to the first side, relative to the aperture in the barrier 9. Each of the flush gates is capable of covering each of the apertures in the barrier 9, when the flush gates are arranged in a closed position. When the flush gates move into an open position, water accumulated in the reservoir is capable of running out through the outlet pipe s and through the apertures in the barrier 9.
The flush gate 7 is provided with one or more flush openings or recesses provided in the opening part of the flush gate 7. This may prevent the gathering of mud and stones piling up in front of the flush gate. If the flush gate 7 for some reason is covered with mud or stones resting on the outside of the flush gate 7, the flush gate 7 is unable to open freely. This may happen during stormy weather or flooding. The water may be accumulated in the reservoir 2 and with the use of the ejector 8 the water pressure through the outlet pipe 6 towards the flush gate 7 can be increased, such that the flush gate 7 is capable of rapidly moving the mud or stones away from the flush gate 7. The function of the flush gate 7 is then restored.
An ejector 8 is arranged in the reservoir 2 relative to one of the outlet pipe 's first end opening. The ejector 8 is capable of ejecting water from the reservoir 2 into outlet pipe 6 when the gate valve 5 related to the outlet pipe is arranged in an open position. The vertical position of the ejector 8 may be adjustable using adjustable means. The vertical position of the ejector 8 may for example depend on the water level in the reservoir 2.
Fig. 2: Showing an embodiment of a drainage system 1 in a cross sectional view. The drainage system 1 comprises a reservoir 2, where the reservoir 2 has an inlet opening wherein a flap gate 4 is arranged on the inner side of the reservoir 2 capable of covering the inlet opening, when the flap gate is arranged in a closed position, which is shown on fig. 2. The gate valve 5 is arranged on the inner side of the reservoir 2, such that the gate valve is capable of covering the outlet opening, when the gate valve is arranged in a closed position.
The outlet pipe 6 has each a first end opening arranged in fluid connection with the outlet opening 11 of the reservoir 2. The diameter of the outlet pipe 6 is approximately the same diameter in the reservoir's 2 outlet opening 11. The outlet pipe 6 is arranged substantially horizontal. The outlet pipe may be slightly sloped so the water may run of the outlet pipe. The outlet pipe's 6 second end opening is arranged in relation to the aperture 10 in the barrier 9.
A flush gate 7 is capable of covering the second end opening of an outlet pipe 6. The flush gate 7 is arranged on the second side of the gate barrier 9, wherein the flush gate 7 is capable of covering the apertures in the barrier 9. The flush gate 7 is arranged in a minor open position, leaving a small opening such that the water may run out of the outlet pipe 6.
An ejector 8 is arranged in the reservoir 2 relative to the outlet pipe 's 6 first end opening. The ejector 8 is capable of ejecting water from the reservoir 2 into outlet pipe 6, when the gate valve 5 is in an open position. The flow of the water F₁ may come from an outlet pipe system arranged relative to the inlet opening of the reservoir 2. The water is accumulated in the reservoir 2, as long as the gate valve 5 is in a closed position. When the gate valve 5 is moved into an open position the flow of the water F₂ is directed through the outlet pipe s 6 and towards the flush gate 7. If the flush gate 7 is in an open position or partially open position, the water will run out of the drainage system 1.
Fig. 3: Showing an embodiment of a three gate valves 5 arranged in a drainage system 1. The gate valves are arranged on the inner side of the reservoir 2. A cross section of the reservoir 2 illustrates clearly that the three gate valves 5 are arranged in an open position. The flush gates 7 can be seen through the end of the outlet pipe s 6.
Fig. 4: Showing an embodiment of the barrier 9 comprising three flush gates 7. The flush gates are shown from the outside of the barrier 9, where the flush gates are in substantially closed position. The flush gates 7 are provided with a recess 12, which leaves a small opening, such that the water may run out of the outlet pipe 6. This construction also prevents the sand, soil or similar to pile up on the outside of the flush gate or flush gates and preventing the flush gates from opening up, when needed.
Fig. 5 shows an embodiment of a drainage system 1 in a cross sectional view, wherein the embodiment is provided with a nozzle system 13 and equalizing pipes 16 for pressure equalization. Sand, soil or similar may pile up in the outlet pipe 6. This may cause the outlet pipe 6 to be more inefficient or even to clog. To prevent the clogging of the outlet pipe 6, a nozzle system 13 is provided in the outlet pipe 6.
The nozzle system 13 comprises at least one nozzle 14, which is in communication with the cavity in the outlet pipe 6. The four nozzles 14 in this embodiment are arranged in a row in the bottom of the outlet pipe 6. The nozzles are connected to a nozzle system pipe 15 which is in communication with the ejector 8.
The ejector 8 is arranged in the reservoir 2 and is directed towards the outlet pipe 6 first end opening. The ejector 8 is capable of ejecting water from the reservoir 2 into outlet pipe 6. The ejector 8 is capable of ejecting water into the nozzle system 13 through the opening in the pipe, such that the water is forced through the nozzles 14 and pushing and/or vortices the sand, soil or similar may piled up in the outlet pipe 6 away from the bottom of the outlet pipe 6. The sand, soil or similar is then carried away from and out of the outlet pipe 6 through the flush gates 7 due to the water flow F₂ in the outlet pipe 6.
The equalizing pipes 16 are providing a communication between the inner side of the outlet pipe 6 wall to the outer side of the outlet pipe 6 wall. The pressure, which is building up in the outlet pipe 6 while the nozzle system is activated, is released through the equalizing pipes 16. The equalizing pipes 16 are in this embodiment arranged in the top of the outlet pipe 6.
In fig. 6 is illustrated a cross-section through an outlet pipe 6, wherein a plurality of ejectors 8 - in this example ten, are arranged along the periphery of the inner perimeter 6' of the outlet pipe 6. In this manner the ejectors 8 will be able to impart energy and thereby motion to the water substantially over the entire cross-section. This in turn results in a substantial water movement. It also creates and under pressure upstream which will cause sediments and other particles to become suspended in the water and forced out through the outlet pipe.

Claims

A drainage system for draining water, characterised in that the drainage system comprising:
- a reservoir (2), having an inlet opening and at least one outlet opening,

- a flap gate (4) arranged on the inner side of the reservoir (2) capable of covering the inlet opening, when the flap gate (4) is arranged in a closed position, and when the flap gate (4) is in an open position, water is capable of running into the reservoir (2),

- at least one outlet pipe (6) having a first end opening and a second end opening, wherein the first end opening is arranged in fluid connection to the at least one outlet opening in said reservoir (2),

- a flush gate (7) arranged relative to said at least one outlet pipe 's (6) second end opening where the flush gate (7) is capable of covering said second end opening, when the flush gate (7) is arranged in a closed position, and when the flush gate is in an open position, water is capable of running out of the at least one outlet pipe 's (6) second end opening.
Drainage system according to claim 1, wherein at least one gate valve (5) arranged relative to said at least one outlet opening, such that said at least one gate valve (5) is capable of covering said at least one outlet opening, when the gate valve (5) is arranged in a closed position, and when the gate valve (5) is in an open position, water is capable of running out of said reservoir through the at least one outlet opening.
Drainage system according to claim 1 or 2, wherein said at least one outlet pipe 's (6) second end opening is arranged on a first side of an gate barrier (9) relative to an aperture in the barrier (9), wherein said flush gate (7) is arranged on the second side of the gate barrier (9) relative to said aperture in the barrier (9), wherein said flush gate (7) is capable of covering said aperture in the barrier (9) when the flush gate (7) is arranged in a closed position, and when the flush gate (7) is in an open position, water is capable of running out of the at least one outlet pipe's (6) second end opening and through an aperture in the barrier (9).
Drainage system according to claim 1 - 3, wherein at least one ejector (8) is arranged in the reservoir (2) relative to the at least one outlet pipe 's (6) first end opening, wherein the at least one ejector (8) is capable of ejecting water from the reservoir (2) into said at least one outlet pipe (6) when the gate valve (5) is arranged in an open position.
Drainage system according to claim 4, wherein a vertical position of said at least one ejector (8) is adjustable, where optionally said vertical position of said at least one ejector (8) is automatically adjustable using adjustable means.
Drainage system according to claim 4 wherein a plurality of ejectors (8) are arranged along a periphery, superposed an inlet to one outlet pipe (6) such that the plurality of ejectors eject water into said outlet pipe (6), and where optionally each outlet pipe 6 is provided with a plurality of injectors (8) along the periphery of each outlet pipe (6).
Drainage system according to any one of the preceding claims, wherein said at least one gate valve's (5) open and closed position is automatically controlled using valve controlling means.
Drainage system according to any one of the preceding claims, wherein the drainage system comprises three outlet openings, wherein three outlet pipe's (6) comprising substantially equal diameter and an equal predefined length, wherein the tree outlet pipe's are arranged in a parallel position in a common vertically height relative to the reservoir (2).
Drainage system according to any one of the preceding claims, wherein one or more nozzle systems (13) is/are arranged in the outlet pipe (6), each nozzle system comprising one or more nozzles (14) and where the nozzle system (13) is in communication with a cavity of the outlet pipe (6), such that the nozzle (14) is capable of injecting water or gas into the outlet pipe (6).
Drainage system according to claim 9, wherein a jet of said nozzle (14) is arranged in a predefine jet angle relative to the water flow in the outlet pipe (6).
Drainage system according to any one of the preceding claims, wherein at least one equalizing pipe (16) is arranged relative to the outlet pipe (6) providing a communication between an inner side of the outlet pipe (6) to and outer side of the outlet pipe, such that the equalizing pipes is capable of equalizing the pressure in the outlet pipe (6).
Drainage system according to any one of the preceding claims, wherein a controlling system in communication with at least one sensor arranged in a predefined position in the draining system, such that the sensor is capable of measuring the water and/or water flow.
Method for draining wastewater using a drainage system according to any one of claim 1 to 12, comprising steps:
- proving said drainage system, and arranging an outlet pipe (6) system in fluid connection with an inlet opening in a reservoir (2) in said drainage system,

- arranging a flap gate (4) on the inner side of the reservoir (2) in an open position, such that the water is capable of running into the reservoir (2),

- arranging at least one gate valve (4) in an open position relative to at least one outlet opening in said reservoir (2), such that the water is capable of running out of the reservoir (2) through said at least one outlet opening.
Method according to claim 13, comprising further step:
- activating at least one ejector (8), such that the at least one ejector (8) ejects the water from the reservoir (2) out through the at least one outlet opening, while the at least one gate valve (4) is in an open position.