NL2020791B1

NL2020791B1 - Technical fish lock

Info

Publication number: NL2020791B1
Application number: NL2020791A
Authority: NL
Inventors: Jacobus Van Boxel Jan
Original assignee: J J Van Boxel Holding B V
Priority date: 2018-04-19
Filing date: 2018-04-19
Publication date: 2019-10-28
Also published as: NL2022036B1

Abstract

Migrating fish often want to travel between different bodies of water, Which may be positioned at different heights. To overcome these heights, water passages may be used that provide a water path at a slope over Which a fish is able to swim up. A compact housing is provided by allowing a water guide over Which the water flow flows to rotate around an axis parallel to gravity in a helical shape. The fish lock may be provided With a resting chamber Which comprises a volume of water With a low flow velocity. Sensors and a controller may be provided to control a flow rate of the water through the fish lock according to for example the type of fish passing through the fish lock and an administrator monitor the fish lock at a distance and may be contacted in case of malfunction.

Description

FIELD OF THE INVENTION

The invention relates to the field of fish locks arranged for guiding fish from one body of water to another.

BACKGROUND

Fish migrate one or more times in their life, for example from a sea or ocean to fresh water and back or the other way around. The different bodies of water through which they migrate usually have different water levels, creating a need for the fish to swim up or down. Manmade barriers such as dams and locks create barriers which fish may not be able to overcome.

Providing a meandering path around or in parallel to such barriers for fish to swim through requires a large surface. EP2767635 discloses an active lift device for transporting fish from a lower situated body of water to a higher situated body of water.

SUMMARY

It is preferred to provide a fish lock that is more efficient.

A first aspect provides a fish lock as an arrangement for guiding fish between a first, lower situated, body of water and a second, higher situated, body of water. The arrangement comprises a housing comprising a first opening and a second opening, wherein when the arrangement is in use the second opening is placed higher with respect to the gravity than the first opening. The housing further comprises a water guide which connects the first opening with the second opening for guide a flow of water from the second opening to the first opening. Herein the water guide provides when in use a flow trajectory for the flow of water around an axis parallel to the gravity vector. Situated higher is in particular to be understood that the upper level of the second body of water is higher than that of the first body of water.

The first opening may be provided in a plane perpendicular to the gravity vector. The housing may further comprise a base, arranged to, in use, be provided below a water level of the first body of water. The first opening may be provided in said base.

The first opening may provided with a tube which deflects a direction of the flow of water which has passed the first opening by a predetermined amount of degrees, for example an angle of 90 degrees such that direction of the flow of water exiting the tube is perpendicular to the gravity vector. The angle preferably is adjustable.

In embodiments of the fish lock, the housing and the base mark out a basin arranged to contain a volume of water between the first opening and the water guide adjacent to the flow of water. The volume of water inside the basin flows significantly less than the water in the flow of water.

Preferably, the water guide comprises substantially only curved surfaces. Even more preferably, the water guide comprises only curved surfaces and thus no straight surfaces. A curved surface is defined as a three-dimensional rounded surface, a may be comprised out of a plurality of joined curved surfaces.

The water guide may comprise one or more flow breakers, arranged to decrease a velocity of the water flow.

The housing of the fish lock may be arranged to, in use, provide light of a pre-determined interval of wavelengths to at least a part of an inner space of the fish lock and preferably to at least a part of the flow of water flowing through the fish lock. This may be accomplished by providing one or more light sources in the housing.

At least one of the first opening and the second opening may be provided with a control mechanism arranged to control a flow through surface for the flow of water through at least one of the first opening and the second opening.

At least one of the first opening and the second opening may be provided with at least one sensor arranged to determine at least one of: a water level, the water quality or a pH level of water flowing through at least one of the first opening and the second opening, a temperature of water flowing through the first opening, a flow rate of the flow of water flowing through at least one of the first opening and the second opening, an oxygen level of the water flowing through at least one of the first opening and the second opening, a pollution of water flowing through at least one of the first opening and the second opening, an amount of fish swimming through at least one of the first opening and the second opening over a certain period of time and a species of the fish swimming through at least one of the first opening and the second opening. Alternatively or additionally, one or more sensors may be provided at different positions in the fish lock for measuring any one or more of the abovementioned parameters.

The control mechanism for the flow through surface of the at least one of the first opening and the second opening may be connected with at least one of the sensors such that a signal sent by the at least one of the sensors may be received by the control mechanism, optionally through a controller. The control mechanism may be arranged to, based on the received output of the sensor, control the flow through surface of the flow of water through at least one of the first opening and the second opening.

A second aspect provides an assembly of at least two fish locks as arrangements according to any of the described embodiments, wherein the second opening of a first fish lock is connected to a first opening of a second fish lock for providing a flow of water for fish between a second opening of a second fish lock and a first opening of the first fish lock. Any number of fish locks may be connected in order to provide a guide for fish over any height differences between two bodies of water.

BRIEF DESCRIPTION OF THE FIGURES

The various aspects and embodiments thereof will now be discussed in conjunction with drawings. In the drawings:

Fig. 1A depicts a fish lock in a body of water.

Fig. IB depicts a section view of the fish lock.

Fig. 1C depicts a detailed section view of the fish lock.

Fig. ID depicts a top view of the fish lock.

Fig. 2 depicts an assembly of fish locks.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Fig. 1A shows a first body of water 10 and a second body of water 20, which are separated by a dam 30. In another embodiment, another separation may be provided, like a ship lock. A water level of the first body of water 10 is lower than a water level of the second body of water 20. Provided at least partially in the first body of water 10 is a fish lock 100, which is arranged to allow fish to pass from the first body of water 10 to the second body of water 20 and/or from the second body of water 10 to the first body of water 10.

The fish lock 100 is arranged to guide fish between the first body of water 10 and the second body of water 20 and allows fish to overcome the height difference between the water level of the first body of water 10 and the water level of the second body of water 20 more easily.

Fig. IB shows a section view of the fish lock 100 provided in the first body of water 10. The fish lock 100 comprises a housing 102 which comprises a first opening 104 and a second opening 106. When the fish lock 100 is in use, the first opening 104 is provided in fluid communication with the first body of water 10 and the second opening 106 is provided in fluid communication with the second body of water 20. This orientation of the fish lock 100 results in the second opening 106 being provided higher with respect to the gravity than the first opening 104.

For a fish in the first body of water 10 trying to swim towards the second body of water 20, the first opening 104 may act as an entrance of the fish lock 100 and second opening 106 may act as an exit of the fish lock 100. Similarly, for a fish in the second body of water 20 trying to swim towards the first body of water 10, the second opening 106 may act as an entrance of the fish lock 100 and the first opening 104 may act as an exit of the first lock 100.

The housing 102 further comprises a water guide 108, which is arranged to connect the first opening 104 and the second opening 106 for providing a water flow from the second opening 106 down to the first opening 104. The water guide 108 may provide, in use, a flow trajectory for the water flow around an axis 110 parallel to the gravity vector g. The flow trajectory is defined as the general trajectory that the water flow follows when flowing from the second opening 106 to the first opening 104. The position of the axis 110 may be anywhere within the housing 102, yet preferably in the centre.

The flow trajectory around the axis 110 may be shaped as a threedimensional helix or spiral-like curve, comprising curved and optionally straight sections. Preferably, the flow trajectory encircles the axis 110 with at least 180 degrees, even more preferably with at least 270 degrees. In other envisioned embodiments, the flow trajectory spirals around the axis 110 with more than 270, even more than 360 degrees. Optionally, the spiral may decrease and/or increase in radius over at least a part of its rotation around the axis 110 resembling the shape of a conical or tapered spring.

Similar to how a spiral staircase demands less area in a house than a straight set of stairs, the arrangement of the flow trajectory around the axis 110 allows the fish lock 100 to be compact and more compact than the known meandering flow paths allowing fish to swim upstream parallel to for example a ship lock.

The total flow trajectory of the water flow through the fish lock 100 may, when projected onto a plane perpendicular to the gravity vector g, cross itself as will become apparent from the flow trajectory 128 shown in Fig. ID.

In the embodiment of the fish lock 100 as shown in Fig. IB, the housing 102 comprises an inner housing part 103. The water guide 108 is provided between the housing 102 and the inner housing part 103.

The flow trajectory has to bridge the water level difference between the first body of water 10 and the second body of water 20 over the length of the flow trajectory. Yet, the difference between a first end of the flow trajectory does not have to be equal to the water level difference between the first body of water 10 and the second body of water 20; it may be less or more. The first opening 104 may be provided slightly below the upper level of the first body of water 10 and the second opening 106 may be provided slightly below the bottom of the second body of water 20 - or the other way around.

A larger length of the flow trajectory provides a lower average slope of the water flow between the second opening 106 and the first opening 104, which may decrease the effort required for a fish to swim from the first opening 104 to the second opening 106. Depending on a desired maximum slope of the water flow, the dimension of the fish lock 100 and the dimensions of the water guide 108 may be determined.

In an embodiment of the fish lock 100, the first opening 104 is provided in a plane substantially perpendicular to the gravity vector g. This may allow the fish lock 100 to be more compact.

Optionally, the housing 102 of the fish lock 100 comprises a base 112 which, when the fish lock 100 is provided in a body of water, is arranged to be under the upper level of the body of water in which the fish lock 100 is provided. When the housing 102 comprises the base 112, the first opening 104 may be provided as an opening in the base 112.

Water having flown through the water guide 108 will subsequently flow through the first opening 104. This flow will attract fish that want to swim upstream and the fish will swim through the first opening 104. Subsequently, with the base 112 being under the water level, fish will be able to accommodate to the fish lock 100 in a body of water above the base 112.

As a further option, the fish lock 100 may comprise a tube 114, extending from the first opening 104 away from the fish lock 102. The tube 114 may be arranged such that the part of the flow path between the first opening 104 and a tube opening 116 is bent by approximately 90 degrees. If the fish lock 100 comprises the tube 114, the tube opening 116 functions as an entrance or exit for fish to enter the fish lock 100.

Now referring to Fig. 1C which shows a detailed section view of an embodiment the fish lock 100, the fish lock 100 comprises a basin 118. The basin 118 is marked out by at least part of the inner housing part 103 and at least part of the base 118. In the basin 118, a volume of water may be contained, wherein said volume of water is relatively sheltered from the water flow which flows through the fish lock 100, from the second opening 106 to the first opening 104.

Herewith, the basin 118 provides a volume of water in which a fish travelling through the fish lock 100 needs to provide less energy in swimming than in the water flow hence allowing a place for a fish to rest. Especially when a velocity of the water flow is high, or when the fish travels through multiple fish locks, a place of rest is advantageous for fish that are travelling from a lower body of water to a higher body of water. In one embodiment, the basin 108 is arranged to provide an area in which the velocity of water streaming is zero or close to zero.

The second opening 106 may be provided with a sliding mechanism 120 as a control mechanism for controlling a flow through surface for the flow of water through the second opening 106. By sliding a slider comprised by the sliding mechanism 120 up, the flow through surface of the second opening 106 may be decreased. By sliding the slider down, the flow through surface of the second opening 106 may be increased up to the point where the sliders is slid away from the second opening 106. Controlling the flow through surface of the flow of water through the second opening 106 allows the flow rate of the flow of water to be controlled.

The sliding mechanism 120 may be connected to a spindle and a spindle motor, wherein rotating the spindle one way causes the sliding mechanism 120 to go up, and rotating the spindle the other way causes the sliding mechanism 120 to go down.

The first opening 104 or the tube 114 may be provided with a measuring tube 122 as a sensor for determining one or more of: a water level, a water quality, pH value, a temperature, a flow rate, an oxygen level, and a contamination level of water flowing through the first opening 104 or the tube 114. Furthermore, the measuring tube 122 as the sensor may be arranged for determining an amount of fish passing through the tube 114 or first opening 104 over a certain time interval, and the species of a fish swimming through the tube 114 or the first opening 104. To identify the amount of fish passing through and/or the species of said fish the sensor may comprise one or more cameras, optionally provided with one or more light sources. The cameras may be coupled to processing units arranged for image detection for defining particular species of fish. Different sensors may be provided at different positions in the fish lock 100, for measuring one or more of the different parameters at multiple positions.

The control mechanism may be provided with a controller 124, for example a PLC controller, a microcontroller, a microprocessor or other, comprising an input for receiving a signal from the sensor. The controller 124 may also comprise an output for sending a signal to a receiver outside the fish lock 100, for example to a manager of the fish lock 100. The signal may be sent over a wired connection, such as the internet or a local area network, or over a wireless connection such a mobile data connection, for example GPRS, 3G, 4G, and 5G, or using Bluetooth or a radio signal.

The controller 124 may further be used to control the light source optionally provided with the fish lock 100, for example by detecting outside light levels and when these levels drop below a certain threshold, activating the light source.

Different flow rates may be advantageous for different types of fish, which may be using the fish lock 100 in different periods of the year. The controller 124 may be arranged to compensate the flow rate for the seasonal migration of one or more specific species of fish.

The controller 124 may be arranged to automatically send data to the manager every certain period of time, or when unexpected values are measured by the sensor, such as high pollution levels or a low flow rate. The controller 124 may also optionally be arranged to communicate with a dam, lock or sluice which controls the water level of the first body of water 10 and/or the second body of water 20. With this communication the flow rate of the flow of water may be controlled, and it may be prevented that the water level inside the fish lock 100 drops below a level wherein fish are unable to enter and/or exit the fish lock 100.

The controller 124 may comprise a processing unit, arranged to process data received from the one or more sensors. By analysing the received data, patterns and correlations may be determined which may be used for automatic control of the fish lock 100.

Components comprised by the fish lock 100 that require electrical energy may be powered by a local electricity grid, or may be provided with a power source comprised by the fish lock 100. Such a power source may comprise means for converting solar irradiation and/or means for converting kinetic energy from a flow of water into electricity. Optionally, an energy storage device such as a battery may be provided to supply energy to the controller 124, sensors, control mechanism and/or any other component of the fish lock 100 requiring electrical energy.

In an embodiment of the fish lock 100, when the sensor has detected a pollution level above a certain threshold, a signal is sent to and received by the controller 124. The controller 124 then provides a temporarily high flow rate for the flow of water in an attempt to clean the fish lock 100 of the pollution. Feedback may be provided by the sensor when the pollution level has decreased again below a pre-determined threshold. If the pollution level does not decrease below the pre-determined threshold, a signal may be sent to the manager of the fish lock 100 and the manager may perform an inspection to identify possible problems.

Embodiments of the fish lock 100 may comprise a transparent roof 126 allowing the housing 102 to provide light of a pre-determined wavelength or interval of wavelengths. The transparent roof 126 reflects outside light of unwanted wavelengths, and only allows light of wanted wavelengths to pass through to the inside of the housing 102. Alternatively, a light source may be provided in the housing 102, wherein said light source is arranged to provide light of the pre-determined wavelength or interval of wavelengths to at least part of the flow of water.

A combination of the transparent roof and one or more light sources is also envisioned, wherein for example during the day sunlight passing through the roof provides the light to at least part of the flow of water, and during the night the light sources are used for providing the light.

Light of the pre-determined wavelength or interval of wavelengths may be used to attract fish to enter and/or pass through the fish lock 100 and/or may provide a relaxing effect to fish. To attract fish to enter the fish lock 100, the light may be provided to at least the entrance of the fish lock 100, for example the first opening 104 or the tube opening 116.

It is know that fish are attracted to green hght and regard green water as being safe from for example predators, and therefor the predetermined interval of light wavelengths may comprise green light, wherein green light may lie, without limitation, approximately between 580 and 480 nanometres.

Fig. ID shows a top view of an embodiment of the fish lock 100. The fish lock 100 is provided with a plurality of flow breakers 127 arranged to decrease the velocity of the flow of water over the water guide 108. The flow breakers 127 may be arranged to create turbulences in the flow of water which may decrease the energy in the flow of water making it easier for a fish to swim upstream towards the second opening 106. In the top view of Fig. ID, the flow trajectory 128 is shown as a dashed line, wherein the dashed line only indicates an average flow trajectory.

Furthermore, round or rounded objects deflect signals that may otherwise reach the lateral line of fish. Reception of signals by the lateral organ of fish may provide an indication of swimming close to an obstacle, like a wall. Deflection of any signals, like vibrations or pressure gradients by rounded objects may provide fish with a sense of swimming through open water rather than a narrow channel provided by the fish lock 100. This provides fish with a more comfortable feeling in the fish lock 100 which, in turn, may result in more frequent use of the fish lock 100.

As shown in Fig. ID, the embodiment of the fish lock 100 is arranged such that the water guide 108 comprises substantially only curved surfaces, such as the curved flow breakers 127. The curved surfaces provide that a fish travelling through the fish lock 100 substantially only sees curved surfaces with his lateral line used to detect movement, vibration, and pressure gradients in the surrounding water. As discussed above, straight surfaces are known to increase stress levels in fish as they are prone to reflect signals sent and received by the lateral line more than curved surfaces, which deflect signals more creating the illusion of a more spacious environment for fish.

The fish lock 100 and/or components comprised by the fish lock 100 such as the housing 102 may comprise polymer materials, such as recycled plastics, though other components like metal, wood, other, or a combination thereof may be envisaged as well.

A size of a fish lock, for example a diameter, may be related to at least one of a drop in water level for which the fish lock is intended to provide a passage for fish, and a flow rate of the water. As the drop increases, and as the flow rate increases, the size of the fish lock may be increased as well. If the size of the fish lock would grow too large due to a high drop and/or flow rate, an assembly of interconnected fish locks may be used.

Fig. 2 shows an assembly 200 of fish locks, comprising a first fish lock 201 according to any of the embodiments in this description and a second fish lock 202 according to any of the embodiment in this description. In the assembly 200, the second opening 212 of the first fish lock 201 is connected to the first opening 221 of the second fish lock 202. With this connection, a flow path may be provided between a second opening 222 of the second fish lock 202 and a first opening 211 of the first fish lock 201.

The first fish lock 201 may comprise a first set of sensors 213, and the second fish lock 202 may comprise a second set of sensors 223. The second opening 222 of the second fish lock 202 may comprise a control mechanism 224 arranged for controlling a flow through surface of the second opening 222 of the second fish lock 202 for controlling a flow rate of water flowing through said second opening 222. The control mechanism 224 may be arranged for receiving one or more signals from the first set of sensors 213 and/or the second set of sensors 214 and may be provided with a controller which may control the control mechanism 224 according to one or more of the received signals.

Assemblies comprising more than two fish locks are also envisioned, and may be required when even higher height differences are to be overcome.

In summary, migrating fish often want to travel between different bodies of water, which may be positioned at different heights. To overcome these heights, water passages may be used that provide a water path at a slope over which a fish is able to swim up. A compact housing is provided by allowing a water guide over which the water flow flows to rotate around an axis parallel to gravity in a helical shape. The fish lock may be provided with a resting chamber which comprises a volume of water with a low flow velocity. Sensors and a controller may be provided to control a flow rate of the water through the fish lock according to for example the type of fish passing through the fish lock and an administrator monitor the fish lock at a distance and may be contacted in case of malfunction.

At least some of the various aspects and embodiments thereof discussed above may be summarised by means of the following numbered embodiments:

1. Arrangement for guiding fish between a first lower situated body of water and a second higher situated body of water, the arrangement comprising a housing comprising:

a first opening and a second opening, wherein in use the second opening is situated higher than the first opening; and a water guide which connects the first opening to the second opening for guiding a flow of water from the second opening to the first opening;

wherein the water guide is use provides a flow trajectory for the flow of water around an axis parallel to the gravity vector.

2. The arrangement according to embodiment 1, wherein the first opening in use is provided in a plane perpendicular to the gravity vector.

3. The arrangement according to any of the previous embodiments, wherein the housing comprises a base, arranged to in use be provided under a water level of the first body of water, and wherein the first opening is provided in the base.

4. The arrangement according to embodiment 3, wherein the first opening is provided in a tube which deflects a direction of the flow of water which has passed the first opening with an angle, which angle for example is a substantially straight angle, and preferably is variable.

5. The arrangement according to embodiment 3 or 4, wherein the housing and the base define a basin arranged to contain a volume of water between the first opening and the water guide adjacent to the flow of water, wherein substantially no water flows in or out of the contained volume of water.

6. The arrangement according to any of the previous embodiments, wherein the water guide comprises substantially only curved surfaces.

7. The arrangement according to any of the previous embodiments, wherein the water guide comprises one or more flow breakers, arranged to decrease a velocity of at least a part of the water flow.

8. The arrangement according to any of the previous embodiments, wherein the housing in use is arranged to provided light of a pre-determined interval of wavelengths to at least a part of an inner space of the arrangement and preferably to at least a part of the flow of water.

9. The arrangement according to any of the previous embodiments, wherein at least one of the first opening and the second opening is provided with a control mechanism arranged to control a flow through surface of the flow of water through at least one of the first opening and the second opening.

10. The arrangement according to any of the previous embodiments, wherein the first opening is provided with at least one sensor arranged to determine one or more of:

a water level;

a quality of water flowing through the first opening; a pH value of water flowing through the first opening;

a temperature of the water flowing through the first opening;

a flow rate of the flow of water flowing through the first opening;

an oxygen level of the water flowing through the first opening;

a pollution level of the water flowing through the first opening;

an amount of fish swimming through the first opening in a pre-determined period of time; and a species of the fish swimming through the first opening.

11. The arrangement according to embodiment 10 to the extent depending of embodiment 9, wherein the control mechanism is connected to the at least one sensor, and is arranged to based on a received output of the sensor control the flow through surface of the flow of water through the second opening.

12. The arrangement according to any of the previous embodiments, wherein the flow trajectory rotates more than 180 degrees around the axis parallel to the gravity vector.

13. The arrangement according to any of the previous embodiments, wherein the flow trajectory rotates more than 270 degrees around the axis parallel to the gravity vector.

14. Assembly of at least two arrangements according to any of the previous embodiments, wherein the second opening of a first arrangement is connected to a first opening of a second arrangement, such that a flow of water is provided from the second opening of the second arrangement to the first opening of the first arrangement.

In the description above, it will be understood that when an element such as layer, region or substrate is referred to as being “on” or “onto” another element, the element is either directly on the other element, or intervening elements may also be present. Also, it will be understood that the values given in the description above, are given by way of example and that other values may be possible and/or may be strived for.

Furthermore, the invention may also be embodied with less components than provided in the embodiments described here, wherein one component carries out multiple functions. Just as well may the invention be embodied using more elements than depicted in the Figures, wherein functions carried out by one component in the embodiment provided are distributed over multiple components.

It is to be noted that the figures are only schematic representations of embodiments of the invention that are given by way of non-limiting examples. For the purpose of clarity and a concise description, features are described herein as part of the same or separate embodiments, however, it will be appreciated that the scope of the invention may include embodiments having combinations of all or some of the features described. The word ‘comprising’ does not exclude the presence of other features or steps than those listed in a claim. Furthermore, the words 'a' and 'an' shall not be construed as limited to 'only one', but instead are used to mean 'at least one’, and do not exclude a plurality.

A person skilled in the art will readily appreciate that various parameters and values thereof disclosed in the description may be modified and that various embodiments disclosed and/or claimed may be combined without departing from the scope of the invention.

It is stipulated that the reference signs in the claims do not limit the scope of the claims, but are merely inserted to enhance the legibility of the claims.

Claims

CONCLUSIESCONCLUSIONS

1. Inrichting voor geleiden van vissen tussen een eerste lager gelegen waterlichaam en een tweede hoger gelegen waterlichaam, de inrichting omvattende een behuizing omvattende:A device for guiding fish between a first lower-lying water body and a second higher-lying water body, the device comprising a housing comprising:

een eerste opening en een tweede opening, waarin in gebruik de tweede opening hoger gelegen is dan de eerste opening; en een watergeleider welke de eerste opening verbindt met de tweede opening voor geleiden van een waterstroom van de tweede opening naar de eerste opening;a first opening and a second opening, wherein in use the second opening is located higher than the first opening; and a water conductor connecting the first opening to the second opening for guiding a water flow from the second opening to the first opening;

waarbij de watergeleider in gebruik een omlooptraject voor de waterstroom voorziet rond een as parallel aan de z waartekr achtsvector.wherein the water conductor in use provides a by-pass path for the water flow about an axis parallel to the gravity vector.

2. De inrichting volgens conclusie 1, waarin de eerste opening in gebruik in een vlak haaks op de zwaartekrachtsvector is voorzien.The device of claim 1, wherein the first opening is provided in use in a plane perpendicular to the gravity vector.

3. De inrichting volgens een van de voorgaande conclusies, waarin de behuizing een bodem omvat, ingericht om in gebruik onder een waterniveau van het eerste waterlichaam te zijn voorzien, en waarin de eerste opening in de bodem is voorzien.The device according to any of the preceding claims, wherein the housing comprises a bottom, adapted to be provided for use below a water level of the first water body, and wherein the first opening is provided in the bottom.

4. De inrichting volgens conclusie 3, waarin de eerste opening is voorzien van een buis welke een richting van de waterstroom die de eerste opening is gepasseerd onder een hoek ombuigt, welke hoek bijvoorbeeld in hoofdzaak een rechte hoek is en bij voorkeur variabel is.The device according to claim 3, wherein the first opening is provided with a tube which deflects a direction of the water flow that has passed the first opening at an angle, which angle is for instance substantially a right angle and is preferably variable.

5. De inrichting volgens conclusies 3 of 4, waarin de behuizing en de bodem een bassin afbakenen ingericht om een volume water vast te houden tussen de eerste opening en de watergeleider aangrenzend aan de waterstroom, waarin het vastgehouden volume water stromingsluw is.The device according to claims 3 or 4, wherein the housing and bottom define a basin adapted to hold a volume of water between the first opening and the water conductor adjacent to the water stream, wherein the retained volume of water is fluid.

6. De inrichting volgens een van de voorgaande conclusies, waarin de watergeleider hoofdzakelijk gekromde vlakken omvat.The device according to any of the preceding claims, wherein the water conductor comprises substantially curved surfaces.

7. De inrichting volgens een van de voorgaande conclusies, waarin de watergeleider een of meerdere stromingsbrekers omvat, ingericht om een snelheid van ten minste een deel van de waterstroom te verminderen.The device according to any of the preceding claims, wherein the water conductor comprises one or more flow breakers, arranged to reduce a speed of at least a part of the water flow.

8. De inrichting volgens een van de voorgaande conclusies, waarin de behuizing in gebruik is ingericht om licht van een vooraf bepaalde interval golflengtes te voorzien aan ten minste een deel van een binnenruimte van de inrichting en bij voorkeur aan ten minste een deel van de waterstroom.The device according to any of the preceding claims, wherein in use the housing is arranged to provide light of a predetermined interval wavelengths to at least a part of an interior space of the device and preferably to at least a part of the water flow .

9. De inrichting volgens een van de voorgaande conclusies, waarin ten minste een van de eerste opening en de tweede opening is voorzien van een regelmechanisme ingericht om een doorstroomoppervlakte van de waterstroom door ten minste een van de eerste opening en de tweede opening te regelen.The device according to any of the preceding claims, wherein at least one of the first opening and the second opening is provided with a control mechanism adapted to control a flow surface of the water flow through at least one of the first opening and the second opening.

10. De inrichting volgens een van de voorgaande conclusies, waarin de eerste opening is voorzien van ten minste een sensor ingericht om een of meerdere te bepalen van:The device according to any of the preceding claims, wherein the first opening is provided with at least one sensor adapted to determine one or more of:

een waterniveau;a water level;

de waterkwaliteit van water wat door de eerste opening stroomt; een pH-waarde van water wat door de eerste opening stroomt; een temperatuur van het water wat door de eerste opening stroomt;the water quality of water that flows through the first opening; a pH value of water flowing through the first opening; a temperature of the water flowing through the first opening;

een debiet van de waterstroom die door de eerste opening stroomt; een zuurstofgehalte van het water wat door de eerste openinga flow rate of the water stream flowing through the first opening; an oxygen content of the water through the first opening

5 stroomt;5 flows;

een vervuilingsgehalte van het water wat door de eerste opening stroomt;a contamination content of the water that flows through the first opening;

een aantal vissen dat over een bepaalde tijdsperiode door de eerste opening zwemt; ena number of fish swimming through the first opening over a certain period of time; and

10 - een soort vis dat door de eerste opening zwemt.10 - a type of fish that swims through the first opening.

11. De inrichting volgens conclusie 10 voor zover afhankelijk van conclusie 9, waarin het regelmechanisme verbonden is met de ten minste ene sensor, en is ingericht om op basis van een ontvangenThe device of claim 10 as far as dependent on claim 9, wherein the control mechanism is connected to the at least one sensor, and is arranged to be based on a received

15 output van de sensor het doorstroomoppervlakte van de waterstroom door de tweede opening te regelen.The output of the sensor controls the flow surface of the water flow through the second opening.

12. De inrichting volgens een van de voorgaande conclusies, waarin het omlooptraject meer dan 180 graden draait rond de as parallelThe device of any one of the preceding claims, wherein the orbital path rotates more than 180 degrees about the axis parallel

20 aan de zwaartekrachtsvector.20 to the gravity vector.

13. De inrichting volgens een van de voorgaande conclusies, waarin het omlooptraject meer dan 270 graden draait rond de as parallel aan de zwaartekrachtsvector.The device of any one of the preceding claims, wherein the orbital trajectory rotates more than 270 degrees about the axis parallel to the gravity vector.

14. Samenstel van ten minste twee inrichtingen volgens een van de voorgaande conclusies, waarbij een tweede opening van een eerste inrichting is verbonden met een eerste opening van een tweede inrichting, zodanig dat een waterstroom wordt voorzien van de tweede opening van de tweede inrichting naar de eerste opening van de eerste inrichting.An assembly of at least two devices according to any one of the preceding claims, wherein a second opening of a first device is connected to a first opening of a second device, such that a water flow is provided from the second opening of the second device to the first opening of the first device.

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Fig. 1AFIG. 1A

Fig. 1BFIG. 1B

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118118

Fig. 1CFIG. 1C

Fig. 1DFIG. 1D

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