CH718746A1 - Deployable dike, deployable dike system and method of piloting such a deployable dike. - Google Patents

Abstract

The invention relates to a deployable dike (40) for containing the rise in the water level of a body of water, in particular a river or a lake, in the event of a flood, the deployable dike (40) comprising a frame having a housing (43), a flap (45) pivotally mounted on the frame to move from a folded position against the frame above the housing (43) to a raised position, and an actuator (48a , 48b) arranged inside the housing (43), the deployable dike (40) further comprising an inlet port and an outlet port, the inlet port being arranged to fill the housing (43) with water in order to that the actuator (48a, 48b), under the action of the increase in the quantity of water in the housing (43), pushes against a lower part of the flap (45) to cause the deployable dike (40) to pass from a first configuration, in which the leaf (45) rests on the frame, to a second configuration, in which the leaf (45) is in the raised position to contain the elevation of the water level, the outlet port being arranged to evacuate the water contained in the housing (43) in order to return the deployable dike to the said first configuration. The invention also relates to a deployable dike system and a method of controlling such a deployable dike.

Description

Technical area

The present invention relates to a deployable dike and a system comprising a set of deployable dikes making it possible to protect inhabited areas in the event of flooding of a body of water, in particular a river, or a lake or sea level rise near inhabited areas during high tides.

State of the art

[0002] In the state of the art, deployable dyke systems already exist.

[0003] By way of example, CN100460601 discloses a movable dike arranged at the edge of a body of water. The dam has a base including a housing and a buoyant movable wall mounted in the housing. A water inlet opening is located on an outer face of the base facing the body of water and communicates with the interior of the housing. In the event of a flood, the water outside the dike is introduced into the housing through the inlet opening and raises the movable wall, under the action of Archimedes' thrust, to a certain height. to contain the rise in water level.

[0004] GB2386144 discloses a flood prevention device comprising one or more barriers. Each barrier includes a housing buried in the ground, a buoyant wall movably held in the housing, and at least one guide member extending substantially vertically from the housing. The guide member is adapted to movably support the floating wall such that when the water level rises beyond a predetermined level, the wall rises to a certain height, below the action of Archimedes' thrust, to contain the rise in the water level.

[0005] US10619318 discloses a deployable seawall having a wall residing in an underground chamber and not obscuring a horizontal view at ground level and buoyant panels. The wall is located between the floatable panels flanking the chamber and is configured to be rotationally lifted out of the chamber by the raising of the floatable panels caused by the raising of the water level within the panels to a vertical position to form a barrier to contain rising water. During receding, the wall passively lowers, so that the horizontal view at ground level is no longer obstructed.

[0006] The dam according to US1061938 has several drawbacks. In particular, it is necessary that the land around the dike is already flooded in order to ensure the elevation of the vertically buoyant panels. Furthermore, the floatable panels are configured to lift a limited load, which could be problematic if obstacles rest on the panels when they are in a folded position against the ground.

[0007] An object of the present invention is to provide a deployable dike which addresses the drawbacks of the state of the art.

[0008] In particular, an object of the present invention is to provide a dike which deploys before the rise in the water level caused by a flood phenomenon reaches the dike.

Another object of the present invention is to provide a deployable dike whose force exerted on the deployable part is significant.

Another object of the present invention is to provide a deployable dike which requires little or no maintenance.

Another object of the present invention is to provide a system comprising a set of deployable dikes.

Brief summary of the invention

[0012] These goals are achieved in particular thanks to a deployable dike to contain the rise in the water level of a body of water, in particular a river or a lake, in the event of a flood. The deployable dike comprises a frame comprising a housing, a leaf pivotally mounted on the frame to pass from a folded position against the frame above the housing to a raised position, as well as an actuator arranged inside the housing. The deployable dam further includes an inlet port and an outlet port. The inlet port is arranged to fill the housing with water so that the actuator, under the action of the increase in the quantity of water in the housing, pushes against a lower part of the leaf to pass the deployable dike from a first configuration, in which the leaf rests on the frame, to a second configuration in which the leaf is in the raised position to contain the rise in the water level. The outlet port is arranged to evacuate the water contained in the housing in order to return the deployable dike to said first configuration.

[0013]According to one embodiment, the frame is buried in the ground so that the leaf of the dike is substantially level with the ground when the leaf is in the folded-down position. Part of the actuator is located at least one meter below ground level.

[0014]According to one embodiment, the actuator is in the form of at least one buoyant block secured to an underside of the leaf so as to be arranged inside the housing when the deployable dike is in said first configuration. The inlet port is arranged on the frame so that water coming from the rise in the water level of the body of water fills, at least in part, the housing so that said at least one buoyant block undergoes Archimedean thrust in order to exert sufficient force against the leaf to actuate the leaf from the folded down position to the raised position in order to bring the deployable dike into said second configuration. The outlet port is arranged on the frame to allow the evacuation of the water located inside the housing after the recession in order to return the deployable dike to said first configuration.

According to one embodiment, the shape and size of said at least one buoyant block are determined so that the Archimedean thrust exerted on the submerged part of the block corresponds to between 70% and 100% of the weight of the assembly formed. by the leaf and the buoyant block so that this assembly is in an equilibrium configuration when the interface between the said submerged part and the non-immersed part of the block is at a distance from the leaf in the said first configuration greater than 50 cm according to a direction orthogonal to a plane coinciding with the leaf.

According to one embodiment, said distance is greater than 1 meter.

[0017] According to one embodiment, the leaf is in the form of a grid. The deployable dike further comprises a sealing membrane attached to an underside of the grid and extending over part of a wall of the housing.

According to one embodiment, the buoyant block(s) is/are made of cork or polystyrene.

According to one embodiment, a cleaning pipe is arranged in the housing of the frame. Part of the cleaning hose is arranged above ground so that one end of the hose can be connected to a water supply.

[0020]According to one embodiment, the actuator is in the form of an extensible casing, for example made of rubber. The expandable envelope contains the inlet and outlet ports of the deployable dyke. The deployable dyke further comprises a pumping device comprising at least one inlet conduit for pumping water from the expanse of water and for conveying it inside the expandable envelope through the port of entrance so as to pivot the leaf from the folded down position to the raised position under the action of the expansion of the extensible envelope caused by its filling with water.

[0021] According to one embodiment, the outlet port is connected to an exhaust duct. The evacuation duct includes a drain valve in order to be able to evacuate the water from the extensible envelope to bring the leaf back to the folded-down position.

According to one embodiment, the leaf is pivotally mounted on the frame by means of hinges.

[0023]According to one embodiment, the deployable dike further comprises a restraint and return system, comprising one or more chains/ropes and one or more attachment elements on or close to an edge opposite the edge of the leaf. pivotally mounted on the frame. One end of the chain/rope or chains/ropes is/are connected to the corresponding attachment element while the other end of the chain/rope or chains/ropes is/are connected on a fixed part relative to the leaf, preferably on the frame so as to stabilize the leaf in the raised position.

[0024]According to one embodiment, the retaining and return system is under tension when the leaf is in the raised position so that the retaining and return system pulls on the leaf to bring it into the folded position a once the flood phenomenon has passed.

Another aspect of the invention relates to a deployable dike system comprising a plurality of deployable dikes. The respective frames of the deployable dikes are juxtaposed with respect to each other in order to form a set of deployable dikes disposed along a stretch of water and arranged between the stretch of water and an inhabited area. The inlet port of each deployable dike being in fluid communication with the outlet port of an adjacent dike located upstream so that the rise in water level successively fills the plurality of dikes of the set.

[0026] According to one embodiment, the set of deployable dykes extends along a non-straight direction.

Another aspect of the invention relates to a method for controlling a deployable dike to contain the rise in the water level of a body of water, in particular a river or a lake, in case of flood. The deployable dike comprises a frame buried in land, a housing arranged inside the frame, a leaf pivotally mounted on the frame to pass from a folded position against the frame above the housing to a raised position as well as at least one buoyant block secured to an underside of the leaf so as to be arranged inside the housing when the deployable dike is in a non-deployed configuration. The frame comprises an inlet port and an outlet port respectively connected to an underground conveying conduit opening upstream of the dike above a first section of the body of water and to an evacuation conduit underground emerging downstream of the dyke above a second section of the body of water. The exhaust duct includes a valve to open or close the exhaust duct. The method includes the following steps: closing the valve of the discharge conduit so that the rise in the water level gradually fills the housing, via the delivery conduit, so that the said at least one buoyant block undergoes Archimedean thrust in order to exert a force sufficient against the flapper to operate the flapper from the folded down position to the raised position to contain the rise in water level, and open the valve once the water level has dropped to a threshold at which any risk of flooding has been ruled out, in order to bring the leaf back against the frame.

According to one embodiment, the method comprises an additional step consisting in injecting water into the housing of the frame, after opening the valve, in order to evacuate various debris through the evacuation duct.

Brief description of figures

Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which: Figure 1a illustrates a schematic view of the deployable dike system when the dike is in an undeployed configuration according to one embodiment of the invention; FIGS. 1b to 1d illustrate a view similar to FIG. 1a during the deployment of the dyke according to the rise in the water level of a river during a flood phenomenon; Figure 2 illustrates a top view of a portion of the system's deployable boom in an undeployed configuration; Figure 3a illustrates a sectional view of the dike of Figure 2 according to A-A, comprising a frame comprising a housing and an inflatable envelope arranged inside the housing; FIGS. 3b to 3d illustrate a view similar to FIG. 3a during the inflation of the inflatable envelope of the dike according to the rise in the water level of the river during a flood phenomenon; FIG. 4 illustrates a perspective view of a deployable dike comprising the frame and a flap folded over the frame without the representation of the inflatable envelope; FIG. 5 illustrates a perspective view of the deployable dike of FIG. 4 after the leaf has been pivoted by 90°; Figure 6 illustrates a view similar to Figure 5 with the envelope in a fully inflated configuration; FIG. 7 illustrates a perspective view of the deployable dam comprising the envelope having an inlet port connected to a transport conduit and an outlet port connected to an evacuation conduit; Figure 8a illustrates a sectional view of the sea wall of Figure 2 along A-A, comprising the frame comprising the housing and a buoyant block arranged inside the housing according to another embodiment of the invention; FIGS. 8b to 8d illustrate a view similar to FIG. 8a during the displacement of the buoyant block of the dike according to the rise in the water level of the river during a flood phenomenon; Figure 9 illustrates a perspective view of the dam in an undeployed configuration with a partial cross-section revealing a buoyant block; Figure 10 illustrates a cross section of the dike according to Figure 9 with a water level present in the housing of the frame; Figure 11 illustrates a perspective view of the dike according to Figure 9 in a deployed configuration; Figure 12 illustrates a perspective view of the connection of a restraint and recall system to the leaf of the dike; FIG. 13 illustrates a perspective view of the dike, the frame of which is embedded in the ground and of which part of the leaf is in contact with a wall according to one embodiment; FIG. 14 illustrates a view similar to FIG. 13 with a simulation of the rise in the water level during a flood phenomenon; Figure 15 illustrates the dam according to Figure 13 in an undeployed configuration; FIGS. 16a to 16e illustrate a cross-section of a terrain comprising the deployable dike with the different sequences of the operation of the dike during a phenomenon of rising and falling of a river located upstream of the terrain; FIG. 17 illustrates a plan view of a river bordering a built-up area and a system comprising a set of deployable dykes which are juxtaposed to each other and which are in a non-deployed configuration, and Figure 18 illustrates a view similar to Figure 17 when the river is in flood and the levees are in a deployed configuration.

Examples of embodiments of the invention

Figures 1a to 1d and more particularly Figures 3a to 3d. illustrate different sequences of a deployable dike system 10 passing from a non-deployed configuration to a deployed configuration during a flood phenomenon of a body of water 80 , in particular a river, according to a form of realization of the invention.

According to Figure 1a, the system 10 comprises a pumping device 20 connected to a deployable dike 40. The pumping device 20 is mounted on a support 30 located between the body of water 80 and the deployable dike 40. This pumping device 20 comprises a suction pipe 22, a hydraulic pump 26 powered by a generator 28, for example an electric or thermal generator, as well as a delivery pipe 24 connected to the deployable dike 40.

To this end, with reference to Figures 2 and 3a, the deployable dike 40 comprises a frame 42 and a leaf 45 pivotally mounted on an upper edge of the frame 42 via hinges 47. The frame 42 is buried in the ground so that the leaf 45 is in line with the ground when it is in a folded position against the upper part of the frame. The frame 42 comprises a housing 43 in which is arranged an extensible casing 50, for example a rubber chamber.

[0033] Referring to Figures 3a to 3d, the deployable dike 40 further comprises a retaining and return system to stabilize the flap 45 when the deployable dike 40 is in its deployed configuration and to return the flap 45 to its position. position folded down once the flood phenomenon has passed. The retaining and recall system preferably comprises several attachment elements 54 (only one attachment element is visible) located at an edge or close to an edge opposite the edge of the leaf 45 pivotally mounted on the frame 42, as well as than more than 56 ropes or chains (only one rope/chain is visible).

[0034] One end of the respective chains or cords are connected to a fixed part, preferably to an upper edge of the frame which is opposite the upper edge of the frame to which the leaf 45 is connected by means of the hinges 47. The other end of the chains or ropes 56 are connected to the corresponding attachment element 54 so that the flap 45 forms an angle of approximately 90° with the ground when the dike is in the deployed configuration in order to contain the rise in the water level . It should be noted that this angle of around 90° is only reached in the event of a high flood. This angle can in fact vary according to the intensity of the flood phenomenon, this angle possibly being much less than 90° in the event of a slight rise in the water level of the stretch of water 80.

[0035] The chains/ropes 56 are useful in the event of a high flood in order to stabilize the leaf 45 in the raised position. The chains/ropes 56 are also over-tensioned when the leaf 45 is in the raised position so that they can pull on the leaf 45 to bring it into the folded-down position once the flood phenomenon has passed.

According to Figure 7, the expandable envelope 50 has an input port 52a and an output port 52b. Delivery conduit 24 is connected to inlet port 52a while an exhaust conduit 60 is connected to outlet port 52b of expandable shroud 50. A drain valve 62 and mounted on the exhaust conduit 60.

[0037] When the phenomenon of flooding of the body of water 80 has started, an operator activates the generator 28 in order to start the hydraulic pump 26 which will suck water from the body of water 80 at the through suction conduit 22 and will route water through conduit 24 into rubber chamber 50 via inlet port 52a. The progressive filling of the chamber 50 has the effect of expanding the chamber and consequently increasing its volume. The rubber chamber 50 will therefore come into contact with the leaf 45 and cause it to pivot progressively as the chamber fills until the leaf 45 has pivoted by approximately 90° to reach its raised position as one can. see it in figure 1d and more particularly in figure 3d.

[0038] After the decline of the body of water 80, an operator opens the drain valve 62 in order to drain the water located in the rubber chamber 50 through the outlet port 52b to drain the water along an evacuation duct 60 in order to bring the water back into the expanse of water 80. The emptying of the rubber chamber 50 makes it possible to reduce the volume of the chamber so that the flap can pivot into the position in which the sash is at ground level.

Referring to Figure 17, a plurality of deployable dikes 40a, 40b, 40c, 40d, 40e, 40f, 40g are arranged so that their respective frame is buried next to each other to form a set of dikes bordering part of a river near a built-up area. Depending on the number of dikes assembled, several pumping devices 20 may be provided in order to be able to move all of the adjacent dikes from their non-deployed configuration according to Figure 17 to their deployed configuration according to Figure 18.

According to another embodiment illustrated by Figures 8a to 16e, the deployable dike has no pumping device. The deployable dike 40 according to FIG. 9 comprises a frame 42 and one or more flaps 45 pivotally mounted on an upper edge of the frame 42 via hinges 47. The frame 42 is buried in the ground so that the flap 45 is in the extension of the ground 90 when it is in a folded position on the upper part of the frame as can be seen in Figure 15.

The frame 42 comprises a housing 43 and the flap 45 is, for example, in the form of a grid which has the advantage of reducing the weight of the flap to allow easier deployment of the dike 40. A membrane impermeable 46 completely covers an underside of the grid 45 as well as a portion of a wall 43a of the housing, as illustrated in FIG. 11 in order to guarantee the tightness of the leaf and of the interface between the leaf 45 and the frame 42.

Still according to Figure 11, one or more buoyant blocks 48a, 48b are secured to the grid at an upper part when the grid is in a raised position. The shape and size of the buoyant block(s) 48a, 48b are determined so that the Archimedean thrust exerted on the submerged part 49a of the block(s) corresponds to between 70% and 100% of the weight of the assembly formed by the leaf 45 , the impermeable membrane 46 and the block or floats 48a, 48b so that this assembly is in an equilibrium configuration when the interface 49c between the immersed part 49a and the non-immersed part 49b of the block (FIG. 10) is at a distance greater than 50 cm from the leaf 45 when the latter is folded down on the frame 42 of the dike. This distance is measured in a direction orthogonal to a plane coinciding with the leaf. For leaves of larger size so that the upper edge of the leaf in the raised position rises, for example, to 5 meters or more, this distance may be greater than one meter.

So that the dike 40 begins to deploy before the rise in the water level 82 caused by a flood phenomenon reaches the dike, as illustrated in particular in Figure 8a, the entire frame 42 is buried in field 90 (Figures 13 to 15). Referring in particular to Figure 16a, the frame 42 includes an inlet port 42a connected to an underground conveying conduit 24 arranged upstream of the dike 40 as well as an outlet port 42b connected to an evacuation conduit underground 60 located downstream of the dyke 40. The conveying pipe 24 leads to a water catchment area 25 located along a first section of a river and at a height greater than the water level of the river when the latter is in its bed while the evacuation pipe 60 leads to a water evacuation zone 63 located along a second section of the river.

The exhaust duct 60 includes a valve 62 to open or close this conduit. A cleaning pipe 44 is arranged in the housing 43 of the frame 42 of the dike 40. A part of the cleaning pipe 44 emerges out of the ground so that one end of the pipe can be connected to a water inlet 70.

[0045] Figures 16b to 16e illustrate the different operating sequences of the deployable dike 40 during a flood and recession phenomenon.

[0046] According to Figure 16b, the water level of the river 80 rises to the height of the water catchment area 25. The water flows along the delivery conduit 24 and flows at the bottom of housing 43 of frame 42 of the dike via its entry port 42a. The valve 62 is closed in order to contain the water inside the housing 43. As the water level of the river 80 rises, the housing 43 of the dike frame gradually fills, this which causes an Archimedean thrust on the buoyant blocks 48a, 48b, 48c causing the rotation of the leaf 45 as can be seen in Figures c and d.

[0047] Depending on the configuration of the land on the river side, the flood may reach the dike before the full deployment of the leaf 45, which causes additional rotation of the leaf depending on the extent of the flood. For a major flood, the force exerted by the rise in the water level against the buoyant blocks 48a, 48b, 48c makes it possible to bring the leaf vertically relative to the ground as illustrated by FIGS. 8d to 8d in order to reach the maximum height of the dike.

[0048] Once the recession phenomenon has started and the water has withdrawn from the dike, the valve 62 of the evacuation pipe 60 is opened so that the water contained in the housing of the dike flows through the outlet port 42b, along the evacuation conduit 60 in order to flow into the river downstream of the ground via the evacuation zone 63. The emptying of the housing allows the flap 45 to be folded down against the top edges of the frame as shown in Figure 16e. According to this figure, a tap 72, located at the level of the water inlet 70 to which the garden hose 44 is connected, is opened in order to clean the housing 43 in order to remove the debris brought by the flood through the port. outlet 42b of the frame 40 and the evacuation conduit 60. The diameter of the outlet port and the evacuation conduit is at least 60cm so that large debris can pass to flow into the river downstream of the ground. The garden hose 44 can have a multitude of nozzles along a segment in order to guarantee a water pressure necessary to evacuate the debris.

The buoyant block(s) 48a, 48b, 48c can for example be made of agglomerated cork, polystyrene or any other material having a low density in order to have buoyancy properties.

[0050] The deployable dike further comprises a retaining and return system to stabilize the flap 45 when the deployable dike 40 is in its deployed configuration and to bring the flap 45 back to the folded-down position once the flood phenomenon has passed. Just as for the first embodiment, the restraint and return system preferably comprises several chains or cords 56, one end of which is attached to a corresponding attachment element 54 located at an edge or close to an edge opposite the edge. of the leaf 45 pivotally mounted on the frame 42 (FIGS. 11 and 12).

According to Figure 11, two floatable blocks 48a, 48b are arranged one beside the other and are mounted on the underside of the leaf against an upper part of the leaf 45 when the latter is in its raised position. It goes without saying that the number and the shape of the blocks 48a, 48b can vary according to the dimensions of the leaf in order to ensure the passage of the leaf 45 from the folded down position to the deployed position under the action of Archimedes' thrust. .

[0052] Depending on the configuration of the terrain 90, walls 64 can be mounted at one of the sides or on each side of the dike 40 according to, for example, the representation which is made of it in Figures 13 to 15. A wall 64 is erected so that one of the side edges of leaf 45 comes into contact with wall 64 when the dike is brought into its deployed configuration. A seal 66 is arranged on the wall 64 so that the entire corresponding side edge of the leaf 45 is in contact with the seal 66 in order to guarantee the seal between the wall 64 and the dike in its deployed configuration.

List of references

[0053] Deployable dike system 10 Pumping device 20 Suction conduit 22 Delivery conduit 24 Water catchment area 25 Hydraulic pump 26 Electric/thermal generator 28 Pumping device support 30 Deployable dike 40 Frame 42 Port of inlet 42a Outlet port 42b Housing 43 Wall 43a Cleaning pipe 44 Flap 45 Sealing membrane 46 Hinges 47 Buoyant block 48 Submerged part 49a Non-submerged part 49b Interface 49c Expandable casing 50 (alternative) Elastic chamber Rubber Inlet port 52a Outlet port 52b Retention and recall system Fastening element 54 Chain/rope 56 Drainage pipe 60 Valve 62 Water evacuation zone 63 Wall 64 Seal 66 Water inlet 70 Tap 72 Scope of water 80 Flood 82 Land 90

Claims (17)

1. Deployable dike (40) to contain the rise in the water level (82) of a body of water (80), in particular a river or a lake, in the event of flooding, the deployable dike (40) comprising a frame (42) having a housing (43), a flap (45) pivotally mounted on the frame (42) to pass from a folded position against the frame (42) above the housing (43) in a raised position, and an actuator (48, 48a, 48b, 48c; 50) arranged within the housing (43), the deployable boom (40) further comprising an inlet port (42a; 52a ) and an outlet port (42b; 52b), the inlet port being arranged to fill the housing (43) with water so that the actuator (48, 48a, 48b, 48c; 50), under the action of the increase in the amount of water in the housing (43), pushes against a lower part of the flap (45) to move the deployable dike (40) from a first configuration, in which the flap (45) rests on the frame (42), has a second configuration in which the leaf (45) is in the raised position to contain the rise in water level, the outlet port (42b) being arranged to evacuate the water contained in the housing (43) in order to return the deployable dike to the said first configuration . 2. Deployable dike (40) according to claim 1, wherein the frame (42) is buried in the ground so that the flap (45) of the dike is substantially level with the ground (90) when said flap is in the position folded down, a part of the actuator being located at least one meter below ground level (90). 3. Deployable dike (40) according to claim 1 or 2, wherein the actuator is in the form of at least one buoyant block (48, 48a, 48b, 48c) secured to the underside of the flap (45) of so as to be arranged inside the housing (43) when the deployable dike (40) is in said first configuration, the inlet port (42a) being arranged on the frame (42) so that water coming from raising the water level (82) of the body of water (80) fills, at least in part, the housing (43) so that said at least one buoyant block (48, 48a, 48b, 48c) experiences Archimedean thrust to exert sufficient force against the flap (45) to actuate said flap from the folded position to the raised position to bring the deployable seawall into said second configuration, the exit port (42b) being arranged on the frame (42) to allow the evacuation of the water located inside the housing (43) after the recession in order to bring the deployable dike back into said first configuration. 4. Deployable breakwater (40) according to the preceding claim, wherein the shape and size of said at least one buoyant block (48, 48a, 48b, 48c) are determined so that the Archimedean thrust exerted on the submerged part ( 49a) of the block (48) corresponds between 70% and 100% of the weight of the assembly formed by the leaf (45) and the buoyant block (48, 48a, 48b, 48c) so that this assembly is in a configuration of balance when the interface (49c) between said immersed part (49a) and the non-immersed part (49b) of the block is at a distance from the leaf (45) in said first configuration greater than 50 cm in a direction orthogonal to a plane coinciding with the leaf. 5. Deployable dike (40) according to the preceding claim, wherein said distance is greater than 1 meter. 6. Deployable dike (40) according to one of the preceding claims, in which the flap (45) is in the form of a grid, the deployable dike further comprising a sealing membrane (46) fixed on an underside of the grid and extending over part of a wall (43a) of the housing (43). 7. Deployable dike (40) according to one of the claims, in which the buoyant block(s) (48, 48a, 48b, 48c) is/are made of cork or polystyrene. 8. Deployable dike (40) according to one of the preceding claims, a cleaning pipe (44) being arranged in the housing (43) of the frame (42), a part of the cleaning pipe (44) being arranged above ground in order to that one end of said pipe (44) can be connected to a water inlet (70). 9. Deployable dike (10) according to claim 1, wherein the actuator (50) is in the form of an expandable envelope, for example of rubber, the expandable envelope (50) comprising the inlet and release ports. outlet (52a, 52b), the deployable dike further comprising a pumping device (20) comprising at least one inlet conduit (22, 24) for pumping water from the body of water (80) and to route it inside the expandable envelope (50) through said inlet port (52a) so as to pivot the leaf (45) from the folded down position to the raised position under the action of the expansion of the expandable envelope (50) caused by its filling with water. 10. Deployable dike (40) according to the preceding claim, wherein said outlet port (42b) is connected to an evacuation conduit (60), the evacuation conduit (60) comprising a drain valve (62) in order to to be able to evacuate the water from the extensible envelope (50) to bring the leaf (45) back into the folded-down position. 11. Deployable dike (40) according to one of the preceding claims, wherein the leaf (45) is pivotally mounted on the frame (42) by means of hinges (47). 12. Deployable dike (40) according to one of the preceding claims, further comprising a retaining and recall system, comprising one or more chains/ropes (56), and one or more attachment elements (54) on or close to an edge opposite the edge of the leaf pivotally mounted on the frame (42), one end of the chain/rope or chains/ropes (56) being connected to the corresponding attachment element (54), the other end of the chain/rope or chains/ropes (56) being connected to a fixed part with respect to the leaf (45), preferably on the frame (42) so as to stabilize the leaf (45) in the raised position . 13. Deployable dike (40) according to the preceding claim, in which the retaining and return system is under tension when the leaf (45) is in the raised position so that said system pulls on the leaf to bring it into the position folded down once the flood phenomenon has passed. 14. Deployable dike system comprising a plurality of deployable dikes (40a, 40b, 40c, 40d, 40e, 40f, 40g) according to one of the preceding claims, the frames (42) of said plurality of deployable dikes being juxtaposed to each other to form a set of deployable dykes disposed along a stretch of water (80) and arranged between said stretch of water and a populated area, the entry port (42a) of each deployable dike being in fluid communication with the outlet port (42b) of an adjacent upstream dike so that rising water levels successively fill the plurality of dikes in the assembly. 15. Deployable dike system according to the preceding claim, wherein said set of deployable dikes extends along a non-rectilinear direction. 16. Method for controlling a deployable dike (40) to contain the rise in the water level of a body of water (80), in particular a river or a lake, in the event of a flood, the deployable dike (40) comprising a frame (42) buried in land (90), a housing (43) arranged inside the frame (42), a flap (45) pivotally mounted on the frame (42) for move from a folded position against the frame (42) above the housing (43) to a raised position, at least one buoyant block (48, 48a, 48b, 48c) secured to an underside of the leaf (45) so as to be arranged within the housing (43) when the deployable dam (40) is in an undeployed configuration, the frame (42) having an inlet port (42a) and an outlet port (42b ) respectively connected to an underground delivery pipe (24) opening upstream of the dike above a first section of the body of water (80) and to an underground evacuation pipe (60) opening in downstream of the dike above a second section of the body of water (80), the evacuation conduit comprising a valve (62) to open or close the conduit, – close the valve (62) of the evacuation pipe (60) so that the rise in the water level (80) gradually fills the housing (43) to pass the deployable dike (40) from a first configuration, wherein the flap (45) rests on the frame (42), to a second configuration in which the flap (45) is in the raised position to contain the water level rise, and – open the valve once the water level has dropped to a threshold at which any risk of flooding has been ruled out, in order to bring the deployable dike back to the said first configuration. 17. Method according to the preceding claim, in which, after opening the valve, water is injected into the housing (43) in order to evacuate various debris via the evacuation duct (60).