Filtering drain

Abstract

Title: Filtering Drain The invention relates to a rainwater filtration system (1) comprising at least one grid (20) provided with openings (201) and intended to collect water (3) flowing from the ground, a collection tank (10) located below the grid (20) in a vertical direction and configured to receive the water (3) passing through the grid (20), the collection tank (10) comprising a bottom wall (10a) and at least one side wall (10b), the collection tank (10) comprising at least one filter screen (11) configured to retain solid debris (42) while allowing water (3) to pass through, the system (1) comprising at least one overflow outlet (11b), having at least one cross-sectional area parameter Poverflow≥ 10*Pscreen, and the water (3) present in the collection tank (10) escapes by overflow through the Overflow outlet (11b). Figure for the abbreviation: Fig. 2B

Description

Title of the invention: Filtering agent technical field

[0001] The present invention relates to the field of rainwater collection and drainage. The invention will find particular application in drains for collecting runoff or cleaning water flowing from roads, pavements, and more generally, soils. STATE OF THE ART

[0002] In the field of rainwater drainage systems, new devices are continually being installed to collect rainwater. In this way, rainwater is, for example, conveyed from the roadway to a city's stormwater drainage network.

[0003] Generally taking the form of grates, storm drains collect rainwater, preventing people from falling into the sewers. Inevitably, storm drains also filter rainwater by preventing medium-sized debris that accumulates on the roadway, such as fallen leaves, from passing through. However, small debris still passes through the grate openings. This is the case with cigarette butts and plastic waste left on the ground by road users. Most often, the water exiting the storm drain is discharged into the natural environment (river, sea, ocean) without further filtration. Thus, urban waste contributes significantly to the pollution of natural environments and has dramatic consequences for the ecosystem and biodiversity.Recent studies indicate that 80% of marine debris originates from land-based activities.

[0004] Faced with this problem, one solution is to add a finer mesh filter positioned below the drain grate. This can be a technical solution, such as that described in document US2009101553A1, which uses a filter basket to allow water to pass through the side and bottom walls. This type of solution makes it possible to retain small and medium-sized debris near the drain grate and therefore in a relatively accessible area. It has been observed that this type of solution regularly becomes clogged. The drain then no longer performs its function of collecting rainwater into the drainage network. The water then remains on the road, leading to a risk of flooding with sometimes serious consequences for residents and road infrastructure. To avoid these flood risks, municipal authorities often prefer to remove the filter baskets. thereby eliminating the entire benefit of these drains in terms of retaining small debris.

[0005] An object of the present invention is therefore to propose a solution which makes it possible to eliminate or limit at least one of the aforementioned disadvantages.

[0006] Another object of the present invention is to provide a solution for better filtering of road debris, while reducing the risk of flooding.

[0007] The other objects, features and advantages of the present invention will become apparent from an examination of the following description and accompanying drawings. It is understood that other advantages may be incorporated. SUMMARY

[0008] To achieve this objective, according to one embodiment, a rainwater filtration system is provided comprising: - at least one drain cover designed to collect water flowing from the ground, - a collection tray located below the plate in a vertical direction and configured to receive the water passing through the plate, the collection tray comprising a bottom wall and at least one side wall, the collection tray comprising at least one filter screen configured to retain solid debris while allowing water to pass through, the filter screen being formed by at least one of the bottom wall and at least a portion of at least one side wall, the filter screen having openings having a passage cross-section parameter Pscreen, - at least one overflow outlet, presenting at least one passage section parameter PsurverSe > 10*Pécran, the passage section parameter being defined as the maximum diameter of a sphere that can pass through the openings of the filter screen and the overflow respectively.

[0009] According to an example, the passage section parameter Psurverse > 50 mm.

[0010] According to one example, the overflow outlet is shaped so as to allow the evacuation of water by overflowing out of the collection tank by passing over at least part of the filter screen and preferably over the entire filter screen.

[0011] The overflow outlet is shaped so that when the collection tank is in a rainwater drainage pipe and the water can no longer or can only poorly drain through the filter screen blocked by debris, the water present in the collection tank escapes by overflow through the overflow outlet above a portion of at least one side wall.

[0012] According to one example, the system also includes at least one cap, having a proximal end located on the side wall and below the overflow outlet, and a free distal end extending into the interior of the collection tank. It is configured so as to define a retention zone with the bottom wall and the side wall. This retention zone is shaped to prevent debris from reaching the overflow outlet by traveling up the portion of the side wall located below the cap.

[0013] According to one example, the plate includes at least one grid with openings. The collection tray is located below the grid in a vertical direction. It is configured to receive the water passing through the grid.

[0014] According to one example, Pscreen is less than a passage section parameter Pgrine of the openings of the drain grid, the passage section parameter Pgriue being defined as the maximum diameter of a sphere that can pass through the openings of the drain grid.

[0015] The presence, within the collection tank, of the overflow outlet and optionally of the cap surmounting the filter screen makes it possible to filter small-sized debris effectively while limiting or even eliminating the risks of flooding due to clogging of the drain.

[0016] Indeed, due to the filling effect, the filtration system quickly becomes clogged with smaller debris. For example, during a downpour, the smaller debris is carried upwards by the fluid and strikes the inner surface of the filter head, allowing the fluid to pass freely over the head. The debris already trapped remains in the collection tank.

[0017] Without the present invention, the filtration system would fill up more quickly and smaller debris would rise up to the road and completely clog the pipe.

[0018] This would lead to stagnant water and flooding of the road which would require urgent intervention by maintenance teams during episodes of heavy rain.

[0019] Thus, the present invention makes it possible to considerably reduce the risks of flooding compared to solutions of type US2009101553A1. During the development of the present invention, it was observed that with a solution of type US2009101553A1, it frequently happens that a strong flow of water causes debris such as leaves to rise up along the side walls of the filter basket and that even before the basket is filled, this debris coats the walls of the basket and continues to adhere to these walls even in the absence of pressure exerted. by water. This debris considerably reduces the flow cross-section of the drain, or even blocks it, despite the depth of the basket.

[0020] In order to reduce the risk of flooding of US2009101553A type solutions, a person skilled in the art would, at best, have considered increasing the filter surface area of ​​the filter basket to reduce the risk of clogging. They might also have considered modifying the shape of the basket to further reduce this risk. They might also have sought solutions to facilitate the removal of debris by a maintenance operator to prevent filter clogging. However, they would in no way have obviously achieved the claimed device.

[0021] Therefore, the present invention prevents a strong flow of water from causing debris such as leaves or cigarette butts to rise up the side walls and, even before the basket is full, from coating the basket walls and clogging the drain. Emptying the basket then becomes necessary, regardless of its depth.

[0022] According to one embodiment, the invention includes a method for placing the collection tray under a sewer grate.

[0023] Another aspect relates to a rainwater collection device configured to be positioned at least partially under and at a distance from a sewer grate at the inlet of a drainage pipe; the collection device is configured to receive water from the grate; the collection device comprises: - a collection tank extending along a bottom wall and at least one side wall, the collection tank comprising at least one filter screen configured to retain solid debris while allowing water to pass through, the filter screen being formed by at least one of the bottom wall and at least a portion of at least one side wall, the filter screen having openings with a passage cross-section parameter Pscreen, the collection device being configured to be positioned at a distance from the grid so as to define an overflow outlet between the side wall and the grid for the water entering the collection tank, - at least one cap, having a proximal end located on the side wall and under an overflow outlet and a free distal end, extending into the inside of the collection tank, so as to define with the bottom wall and the side wall a retention zone shaped to prevent debris from accessing the overflow outlet by going up along the portion of the side wall located under the cap.

[0024] Another aspect relates to a method for constructing a rainwater filtration system comprising the following steps: - positioning of the collection tank in a housing forming an inlet for a rainwater drainage pipe, - Positioning of the catch basin plate, including at least the grate with openings above the collection tray, so as to close the pipe opening. The grate is positioned at a distance from at least one side wall to form the overflow, which is shaped so that when the collection tray is in the pipe and the water can no longer drain through the filter screen blocked by solid debris, the water in the collection tray overflows through the overflow outlet above a portion of at least one side wall. We simply added oblong holes across the entire surface of the grate.

[0025] The collection tray can be perfectly positioned in a housing that was previously equipped with a drain cover but without a collection tray. In this case, the method includes a preliminary step involving the removal of the drain cover before positioning the collection tray. Thus, this method makes it possible to equip an existing drain with a collection tray and an overflow, in order to give this existing drain additional functionalities in terms of retaining small debris and providing protection against flooding. BRIEF DESCRIPTION OF THE FIGURES

[0026] The aims, objects, features and advantages of the invention will become clearer from the detailed description of an embodiment thereof, which is illustrated by the following accompanying drawings in which:

[0027] [Fig.1A] Fig.1A represents a perspective view with a partial section of an example of a filtration system according to the invention, configured to be positioned straddling the roadway and the sidewalk.

[0028] [Fig.1B] [Fig.1B] represents a cross-sectional view of an example similar to that of [Fig.1A],

[0029] [Fig.2A] Fig.2A represents a perspective view with a partial section of an example of a filtration system according to the invention, configured to be positioned under the pavement.

[0030] [Fig.2B] Fig.2B represents a cross-sectional view of an example similar to that of Fig.2A.

[0031] [Fig.3A] Fig.3A represents a perspective view with a partial section of an example of a filtration system according to the invention, configured to be positioned at the level of and under a curb of a sidewalk.

[0032] [Fig.3B] [Fig.3B] represents a cross-sectional view of an example similar to that of [Fig.3A],

[0033] [Fig.4A] Figures 4A and 4B represent a view along a vertical plane of examples of overflow outlets.

[0034] [Fig.4B]

[0035] [Fig.5A] Fig.5A represents a cross-sectional view of an example of a filtration system including an additional cap.

[0036] [Fig.5B] Fig.5B represents a cross-sectional view of an example of a filtration system including a stop to hold the collection tank in case of overflow of the pipe, a filtration system in which the collection tank rests on a secondary frame.

[0037] The drawings are given by way of example and are not limiting of the invention. They constitute schematic representations of principle intended to facilitate understanding of the invention and are not necessarily to scale with practical applications. DETAILED DESCRIPTION

[0038] Before proceeding with a detailed review of embodiments of the invention, optional features that may be used in combination or alternatively are listed below:

[0039] According to one example, the bottom wall is, in the operating configuration, parallel and distant from the surface of the pavement.

[0040] According to one example, the ground is preferably a roadway or a pavement.

[0041] According to one example, the overflow outlet is located entirely above the screen filtering, at least relative to the wall carrying or defining the overflow.

[0042] According to one example, the overflow outlet is located between the side wall of the collection tank and the drain grid.

[0043] According to one example, the overflow outlet is carried by the collection tank. It is defined in at least one side wall. Alternatively, it is defined by a space formed between the collection tank and the grid.

[0044] According to one example, the lower face of the drain plate has at least one substantially horizontal portion.

[0045] According to one example, the entire underside of the drain plate is substantially horizontal. Alternatively, only a portion of the underside of the drain plate is substantially horizontal, with at least another portion extending in a plane inclined to the horizontal.

[0046] According to one example, the plate is in two parts. The two parts are disjoint. According to another example, each part comprises a grid. The underside of each part extends mainly in a plane. According to another example, the plane of a first part of the grid is parallel to the plane of a second part of the grid. Alternatively, the plane of a first part of the grid is inclined relative to the plane of a second part of the grid.

[0047] Preferably, the plate has an upper face turned towards the outside of the system and an lower face turned towards the collection tray.

[0048] In one example, the filter screen is rigid. In another example, the filter screen is flexible. In yet another example, the filter screen comprises flexible and rigid parts. In one example, the filter screen is made of grating, preferably of a metal alloy. Alternatively, a composite material or polyester may be used.

[0049] According to an example, the passage section parameter Pé cran and the passage section parameter Pgriues are such that Pé cran < 0.7 * Pg^e and preferably Pé cran < 0.5 * Pgniie and preferably Pé cran < 0.3 * Pg^.

[0050] According to an example, the passage section Pé cran < 10 mm, Pé cran < 7 mm, Pé cran < 5 mm. According to an example, Pcrantel such as 5 mm <Pécran < 8 mm.

[0051] Thus, the filter screen allows debris to pass through that can fit inside a sphere with a maximum diameter of 5 mm. Debris that fits inside a sphere larger than 5 mm in diameter is retained by the filter screen.

[0052] According to one example, Pgrille >10 mm. Thus, the drain grate allows debris to pass through if it fits inside a sphere with a diameter of 10 mm. According to one example, Pgriue >50 mm. According to one example, Pg^e >100 mm.

[0053] According to an example, P^ue < 25 mm and preferably Pgriue < 15 mm. Debris fitting inside a sphere of more than 25 mm and preferably more than 15 mm in diameter is retained by the drain grate.

[0054] According to one example, the overflow outlet is located at a distance Hsurverse from the bottom wall of the collection tank, such that Hsurverse > 0.3 * Htotai, where Hsurverse is the vertical dimension taken at the overflow point between the bottom wall of the collection tank and an underside of the grid, Hsurverse and Htotai being measured vertically, Hsurverse being measured at the lowest point of the overflow outlet, preferably Hsurverse > 0.5 * Htotai. Preferably Hsurverse > 0.6 * Htotai. Preferably Hsurverse > 0.7 * Htotai. Preferably Hsurverse — 0.8 Htotal. Preferably Hsurverse — 0.9 Htotal.

[0055] According to an example, the overflow outlet is located at a distance HsUrVerse < 0.4 * Htotai.

[0056] According to one example, the bottom wall is located, in a vertical direction, at more than 5 cm from the grid.

[0057] According to one example, the back wall is located, in a vertical direction, at less than 15 cm from the grid.

[0058] According to an example, the back wall is located, in a vertical direction, more than 5 cm from the grid so that Htotai >15 cm with Htotai being the height in a vertical direction between the back wall and the grid and preferably Htotai >20 cm.

[0059] According to one example, the bottom wall is located, in a vertical direction, less than 15 cm from the grid, so that Htotai <15 cm with Htotai being the vertical dimension, taken at the overflow between the bottom wall of the collection tank and a lower surface of the grid, Hsurverse and Htotai being measured along the vertical, Hsurverse being measured at the lowest point of the overflow outlet, and preferably Htotai<20 cm.

[0060] According to an example, 10cm <Hsurverse <50 cm

[0061] According to one example, at least one overflow outlet has an outlet height of The overflow height (hnb) is between 5 cm and 30 cm, and preferably between 5 cm and 15 cm, preferably between 5 cm and 10 cm. The upper overflow height (hnb) is defined, in a vertical direction, as the vertical dimension of the overflow. This can correspond to the vertical distance between the lower and upper ends of the overflow. If the overflow extends to the grate, the overflow outlet height is measured between the highest portion of the side wall and the grate.

[0062] According to one example, at least one overflow outlet has a cross-sectional area parameter Psurverse. Preferably PsurverSe is greater than or equal to 10 mm, preferably 20 mm, preferably 40 mm, preferably 50 mm, and preferably 70 mm. Preferably PsurverSe is less than or equal to 150 mm, preferably 60 mm, and preferably 50 mm. Preferably Psurverse is between 10 mm and 100 mm, preferably between 20 mm and 60 mm, and preferably between 10 mm and 50 mm. The cross-sectional area parameter Pécran of the filter screen is between 1 mm and 10 mm, preferably between 1 mm and 5 mm, and preferably between 1 mm and 3 mm. Psurverse is measured in a vertical plane.

[0063] According to one example, the headgear is supported by at least one lateral wall.

[0064] According to one example, the cap extends transversely over a width Lcoiffe, such that LCOiffe > 0.7 * Lsurverse, Lsurverse being the width of the overflow outlet, Lcoiffe and Lsurverse being measured horizontally, preferably 0.9 * Lsurverse < Lcoiffe < 1.1 * Lsurverse.

[0065] According to one example, the cap is shaped so that, in projection onto a vertical plane, its distal end is located below its proximal end.

[0066] According to one example, the cap has a main portion extending from its proximal end and an end portion extending from its distal end, the end portion forming an angle with the main portion so that the end portion approaches the bottom wall of the collection tank as it approaches the distal end.

[0067] This end portion further enhances debris retention in the retention zone by preventing it from reaching the overflow outlet by bypassing the distal end of the cap. This effect is even more significant when the debris has good buoyancy.

[0068] According to one example, the end portion extends in a vertical direction.

[0069] According to one example, the end portion measures at least 1 cm.

[0070] According to one example, the side wall and the overflow outlet are flat. Such is the This is the case if the lateral walls form a polygon in cross-section, for example a rectangle. Alternatively, they are curved. This is the case if the lateral walls form a cylinder.

[0071] According to one example, the grid and the collection tray are two removable elements.

[0072] It is possible to remove at least part of the grate to access the collection tray for cleaning without having to remove it completely. Furthermore, it is possible to remove the collection tray while leaving the drain cover in place. Thus, in the event of forecasted heavy rain or if it is impossible to schedule cleaning of the collection trays, the trays can be removed. The water flowing through the drain grate will then flow directly into the sewer.

[0073] According to one example, the filtration system includes a main frame shaped to receive the grid in a removable manner.

[0074] According to one example, the main frame forms a cavity shaped to house the collection tray and which opens into a rainwater drainage pipe.

[0075] According to one example, the main frame is made of concrete.

[0076] Preferably, the main frame is integral with the roadway.

[0077] According to one example, the main frame having a surface configured to cooperate with the collection tray so as to extend T at least one side wall.

[0078] According to one example, the filtration system includes an intermediate main frame, supported by the main frame and which is shaped to support the grid and / or the collection tray.

[0079] According to one example, the intermediate frame is made of metal, preferably cast iron.

[0080] According to one example, the side wall and the cap form a single piece monobloc, preferably made from a single material, for example cast iron or stainless steel or galvanized steel.

[0081] According to one example, the cap includes a portion made of folded sheet metal.

[0082] According to one example, the cap makes an angle of 30° relative to the upper face of the grid.

[0083] According to one example, the grid has a first portion of the grid configured to be positioned at the height of a sidewalk and a second portion of the grid distinct from the first portion of the grid, the two portions being separable, the second portion grid being configured to be positioned so as to extend in continuity with a roadway.

[0084] According to one example, the plate has a first surface configured to be positioned at the height of the level of a sidewalk and a second surface inclined relative to the upper surface of the sidewalk having openings.

[0085] According to one example, the plate has a first portion configured to be positioned so as to extend in continuity with a roadway and a second portion distinct from the first portion, configured to be positioned at the height of a sidewalk, the two portions being separable.

[0086] According to one example, the bottom wall is, in the operating configuration, parallel and distant from the surface of the pavement.

[0087] The term "operating configuration" means the configuration in which the collection tray is positioned under the plate so as to allow double filtration of the water flowing from the roadway to the drainage outlet.

[0088] The term "passage cross-section" refers to the open surface configured to allow the passage of water. Although a surface area, the passage cross-section can be reduced to a length parameter defined as the maximum diameter of a sphere that can pass through the openings of the filter screen and, respectively, the inlet grate, or through the overflow. This parameter can be measured along a plane transverse to the direction of water flow. In the case of a cylindrical tube, the passage cross-section is a function of the diameter of the passage section delimited by the tube walls in a plane transverse to the water flow within the tube. In the case of a filter screen or grate, the passage cross-section is understood as the surface area in a plane transverse to the passage of water through an elementary opening 101, 201. The term "flow cross-section" refers to the sum of the passage cross-sections configured for the passage of a fluid.

[0089] The passage section can be measured in a vertical plane, such as for example in the plane of the cross-sectional figures along the direction transverse to the direction of passage of the water through the openings.

[0090] It is specified that, within the framework of the present invention, the terms "on", "overcomes", "covers", "underlying", "opposite" and their equivalents do not necessarily mean "in contact with".

[0091] In the following description, unless otherwise indicated, when reference is made to absolute positional qualifiers, such as "front", "back", "top", "bottom", "left", "right", etc., or relative positional qualifiers, such as "above", "below", "superior", "inferior", etc., or to orientational qualifiers, such as "horizontal", "vertical", "lateral", etc., reference is made to the orientation of the figures corresponding, with the retention device placed in its operating configuration.

[0092] An element located "in line with" or "directly above" another element means that these two elements are both located on the same line perpendicular to a plane in which extends mainly a lower or upper face of an element.

[0093] The terms "approximately", "about", "on the order of" mean "to within 10%, preferably to within 5%" or, when referring to an angular orientation, "to within 10°". Thus, a direction substantially normal to a plane means a direction having an angle of 90+10° with respect to the plane.

[0094] In the following description, the term "on" does not necessarily mean "directly on." Thus, when it is stated that a part or component A is supported "on" a part or component B, this does not mean that parts or components A and B are necessarily in direct contact with each other. These parts or components A and B may be either in direct contact or supported by each other via one or more other parts. The same applies to other expressions such as, for example, the expression "A acts on B," which may mean "A acts directly on B" or "A acts on B via one or more other parts."

[0095] In this patent application, when two parts are described as distinct, this means that these parts are separate. They are: - positioned at a distance from each other, and / or - mobile relative to each other and / or - joined together by being fixed by added elements, this fixing being removable or not.

[0096] A single-piece unit cannot therefore be made up of two separate parts.

[0097] The invention relates to a rainwater filtration system. Generally, following periods of heavy rainfall, storm drains tend to become completely clogged despite the use of filtration solutions. Indeed, the accumulation of intermediate-sized debris, such as cigarette butts or mud, tends to clog the filters. This leads to overflows from the drain.

[0098] The present invention makes it possible, in particular, to prevent the total obstruction of the drain by allowing water to continue flowing over the filter screen. Thus, the risk of road flooding due to blocked drains is greatly reduced.

[0099] The filtration system 1 comprises at least one drain plate 2 with a grid 20 having openings 201. The openings 201 are intended to collect water 3 flowing from the ground, preferably from the roadway 30, while preventing the passage large debris such as dead leaves cannot flow into the drainage pipe 6. Large debris, such as dead leaves, therefore remains blocked by the grid 20.

[0100] A collection tray 10 is located below the plate in a vertical direction. The collection tray 10 is configured to receive water passing through the grid as well as debris 42 whose size allows passage through the openings 201 of the grid 20.

[0101] The collection tank 10 comprises at least one filter screen 11 having openings 101. The filter screen 11 is configured to retain solid detritus 42 while allowing water to pass through. The openings 101 pass through at least the bottom wall 10a and preferably a side wall 10b. Preferably, the openings 101 of the collection tank 10 form a mesh configured to allow water to pass through and retain detritus 42 whose size is larger than the openings 101 formed by the mesh.

[0102] According to a preferred embodiment, the collection tank 10 comprises a bottom wall 10a and at least one side wall 10b.

[0103] According to one example, the walls can form, according to a horizontal section, a closed perimeter or alternatively an open perimeter. This perimeter can have a circular or polygonal shape.

[0104] The filter screen 11 is formed by at least one of the bottom wall 10a and advantageously by a portion 111b of at least one side wall 10b.

[0105] The filter screen 11 may be rigid. In this case, it does not deform under its own weight. Preferably, it does not deform under manual force exerted by a user. For example, the filter screen 11 may comprise or be made of a metallic or plastic material. Alternatively, the filter screen 11 may be flexible. In this case, it may deform under its own weight. The filter screen 11 may then be in the form of a mesh. According to another example, the filter screen may comprise at least one flexible part and at least one rigid part.

[0106] Preferably, the openings 101 have a passage cross-section parameter Pscreen lower than the passage cross-section parameter Pgriue of the openings 201 of the drain grate 20. The passage cross-section is defined as the maximum diameter of a sphere that can pass through the openings 101, 201. Pgriue is measured in the plane of the grate at the level of the considered opening 201. In [Fig. 2A], the reference Pgriue is indicated. In this case, Pgriue is the diameter of a disk whose dimension corresponds to the width of the rectangular openings 201. The reference Pgriue and Pscreens are also indicated in [Fig. 2B]. For ease of understanding, the openings 201 of the Grid 20 is represented in a direction perpendicular to that of [Fig.2A]. Naturally, the PéCranne dimension can only be measured by taking into consideration the shape of the opening 101 in the horizontal plane and not solely a cross-sectional view.

[0107] According to a preferred embodiment, the device includes at least one overflow outlet 11b. The overflow outlet 11b is configured so as to allow the flow of water entering through the openings of the grid 20 even when the collection tray 10 is completely closed and the water level in the collection tray 10 rises sufficiently to reach the overflow outlet 11b.

[0108] According to one example, the overflow outlet 11b extends from a lower face 20b of the grid 20 to at least one side wall 10b of the collection tray 10.

[0109] Advantageously, this overflow outlet 11b has at least one passage cross-section parameter PSUrverse > 10 * Pscreen - Thus, many debris 42 retained by the filter screen 11 can pass through the overflow outlet 11b. Water flow is ensured even when the filter screen 11 is clogged.

[0110] According to an optional but advantageous embodiment, the filtration system 1 includes a cap 12, attached to the collection tank 10. The cap 12 forms a visor attached to the side wall 10b of the collection tank 10. It is configured so as to prevent the debris 42 from rising from the collection tank 10 towards the overflow outlet 11b, more specifically when this debris 42 rises near the side wall 10b located directly above the overflow outlet 11b. Thus, the cap 12 allows a passage for the evacuation of water 3 entering through the openings 201 of the grid 20 when the filter screen 11 is blocked by debris 42 while preventing this debris 42 from being carried into the pipe 6. The cap also allows to retain sludge, alluvium or even road aggregates, thus preventing the latter from contributing to a clogging of the overflow outlet 11b.

[0111] Preferably, the cap 12 has a proximal end 12a configured to become fixed with the side wall 10b so as to be positioned under the overflow outlet 11b when the collection tray 10 is in operating configuration, positioned under the plate 2.

[0112] In addition, the cap 12 also has a distal end 12b, extending into the inside of the collection tank 10, so as to define with the bottom wall 10a and the side wall 10b a retention zone lia shaped to prevent detritus 42 from accessing the overflow outlet 11b by going up along the portion 111b of the side wall 10b located under the cap 12.

[0113] The cap 12 may have a curved portion. In one particular example, the cap 12 has a funnel shape. This is notably the case when the side wall has a curved shape such as a circle or a portion of a circle. The funnel's opening is then located at the center of the curve or circle. The funnel allows the water to be directed.

[0114] SYSTEM POSITIONING

[0115] According to a particular embodiment, the lower face 20b of the grid 20 is parallel and distant from the surface 3a of the roadway 30.

[0116] The ground may be a roadway or a carriageway 30 or a sidewalk 31. The system may be positioned under a sidewalk 31 and / or under the carriageway 30.

[0117] According to one example, the lower face 20b of the drain plate 2 has at least one substantially horizontal portion 22. Advantageously, the plate 22 has two faces that are parallel to each other.

[0118] According to one example, the entire lower face 20b of the drain plate 2 is substantially horizontal. Alternatively, only a portion of the lower face of the drain plate 20b is substantially horizontal, with at least another portion extending in a plane inclined to the horizontal.

[0119] According to one example, the plate 2 is in at least two parts, preferably in two parts. The two parts are disjoint. These two parts form a first portion 21 and a second portion 22. According to one example, each portion 21, 22 comprises a grid 20. The lower face 20b of each portion extends mainly in a plane. According to one example, the plane of the first portion 21 is parallel to the plane of the second portion 22.

[0120] Alternatively, the plane of the first portion 21 is inclined with respect to the plane of the second portion 22.

[0121] Preferably, the plate 2 has an upper face 20a facing outwards from the system and an lower face 20b facing towards the collection tray 10. The upper face 20a and the lower face 20b are advantageously flat and parallel.

[0122] PASSAGE SECTION

[0123] Preferably, the grid 20 has at least one opening 201, preferably a plurality of openings 201. In a particular embodiment, these openings 201 have an identical cross-section. These openings 201 may have, as in the example illustrated in [Fig. 2A] and 2B, a rectangular cross-section when viewed from a point parallel to the upper face 20a or lower face 20b at the level of the opening in question. Any other shape is possible.

[0124] Preferably, the openings 201 of the grid 20 have a passage cross-section parameter Pgrine and the openings 101 of the filter screen 11 have a passage cross-section parameter Pscreen. The passage cross-section parameter Pscreen is defined as the maximum diameter of a sphere that can pass through the openings 101 of the filter screen 11. The passage cross-section parameter Pgriue is defined as the maximum diameter of a sphere that can pass through the openings 201 of the drain grid 2.

[0125] The parameters of the pass-through section Pscreen and Pgniie are such that Pscreen < 0.7 * Pgriue and preferably Pscreen < 0.5 * Pgniie and preferably Pgniie < OVP -1- screen — Seen A grid*

[0126] Preferably, Pscreen is less than or equal to 5 mm.

[0127] Thus, the filter screen 11 allows the passage of debris 42 that can fit inside a sphere with a maximum diameter of 5 mm. In fact, debris 42 that fits inside a sphere larger than 5 mm in diameter is retained by the filter screen 11.

[0128] According to one example, the parameter of the passage section Pgriue >10 mm. Thus, the drain grate preferentially allows the passage of debris 42 that fits inside a sphere of 10 mm in diameter.

[0129] According to one example, the passage section parameter Pgriue < 150 mm, Pg^ < 100 mm, preferably Pgrine < 50 mm, preferably P^ue < 20 mm and preferably Pgniie < 15 mm. The detritus 42 fitting inside a sphere of more than 25 mm in diameter and preferably of more than 15 mm in diameter is therefore retained by the drain grate 20.

[0130] The openings 101, 201 may be regular or irregular, periodic or irregular, of the same cross-section or not, and preferably distributed in a honeycomb pattern. If the openings 101, respectively 201 do not have the same cross-sectional areas, then Péc ran and Pgriue respectively shall be defined as the smallest dimensions of the cross-sectional areas of the openings 101, respectively 201.

[0131] The openings 201 may have different sections so as to allow the drainage of rainwater 3 to be guided in a preferred direction.

[0132] THE SURGE

[0133] The bottom wall 10a is located, in a vertical direction, more than 10 cm from the lower surface 20b of the screen 20, preferably more than 15 cm from the lower surface 20b of the screen 20, and preferably more than 25 cm from the lower surface 20b of the screen 20. This allows for the storage of a larger quantity of debris 42 inside the filtration system between two maintenance procedures. During a maintenance procedure, all of the debris 42 can be vacuumed through the screen 20 or manually removed.

[0134] The overflow outlet 11b has a passage cross-section parameter PsurverSe greater than 10 mm, preferably greater than 40 mm. For example, Psurverse is between 10 mm and 100 mm, preferably between 20 mm and 60 mm.

[0135] According to the preferred embodiment of the present invention PsurverSe^ 6*Pécran, of Preference PsurVerse> 8*P ux screen? preferably PsurverSe> 10*Screen, preferably PsurverSe> 12*Screen, preferably Psurverse> 15*Pécran and preferably PsurverSe^ 1R*PP > 10 screen? Overflow— 20*P x screen*

[0136] OVERFLOW OUTLET

[0137] According to one embodiment, the overflow outlet 11b is located below the grid 20. Preferably it is located above the cap 12 when the latter equips the collection tank 10.

[0138] According to a particular embodiment, the overflow outlet 11b has an overflow outlet height hnb in the vertical direction, the dimension of which is less than 50 mm, preferably less than 40 mm, preferably less than 25 mm and preferably less than or equal to 20 mm.

[0139] According to a particular embodiment, the overflow outlet 11b has an overflow outlet height hnb in the vertical direction, the dimension of which is greater than 2 mm, preferably greater than 5 mm, preferably greater than 15 mm.

[0140] According to a particular embodiment, the overflow outlet 11b is located at a distance Hoverflow from the bottom wall 10a of the collection tank 10, such that Hoverflow > 0.2 * Htotai, Htotai being the vertical dimension, taken at the overflow between the bottom wall of the collection tank and the lower face 20b of the grid, Hoverflow and Htotai being measured along the vertical, Hoverflow being measured at the lowest point of the overflow outlet 11b, preferably Hoverflow > 0.3 * Htotai.

[0141] According to an example, the overflow outlet 11b is located at a distance H overflow < 0.4 * H total •

[0142] According to an example, 10cm <Hsurverse <50cm.

[0143] RETENTION ZONE

[0144] Preferably, the space delimited by the cap 12 and the side wall 10b is a retention zone 1la. The retention zone 1la is configured to retain the debris 42. Thus, during a total blockage of the filter screen 11, the solid debris 42 is retained in the retention zone 1la and leaves the overflow outlet 11b free.

[0145] Optionally, the retention zone 1 also extends at least partially along the bottom wall 10a.

[0146] THE HEADDRESS

[0147] Advantageously, the cap 12 retains the debris from the collection tray after it has passed through the openings 201 of the grid 20 of the plate 2. The cap 12 is not specifically a plate or a solid element. It may be an element featuring openings or a plurality of elements configured to retain debris in a retention area.

[0148] Preferably, the cap 12 is fixed to the upper end of the side wall 10b of the collection tray 10.

[0149] The cap may be a metal sheet, possibly perforated. It may also be made of cast iron. The cap may also be a grid or a net configured to allow the passage of water 3 but the retention of debris 42.

[0150] Preferably, the cap 12 has a proximal end 12a and a distal end 12b.

[0151] According to one example, the cap 12 extends transversely over a width Lcoiffe, such that LCOiffe > 0.7 * Lsurverse, Lsurverse being the width of the overflow outlet 11b, LCOiffe and LSurverSe being measured horizontally, preferably 0.9 * Lsurverse < LCOiffe < 1.1 * Lsurverse.

[0152] Preferably, the cap 12 is shaped so that, when projected onto a vertical plane, its distal end 12b is located below its proximal end 12a. In other words, in an operating configuration, the cap 12 extends in a direction that is oblique relative to the bottom wall 10a.

[0153] According to one embodiment, the cap 12 has a main portion 121 extending from its proximal end 12a and an end portion 122 extending from its distal end 12b, the end portion 122 forming an angle with the main portion 121 so that the end portion 122 approaches the bottom wall 10b of the collection tank 10 as it approaches the distal end 12b.

[0154] According to one example, the cap 12 has an end portion 122 forming a folded angle configured to further enhance the retention of detritus 42 in the retention zone 1la by preventing them from reaching the overflow outlet 11b by bypassing the distal end of the cap 12. This effect is even more significant when the detritus 42 has good flotation.

[0155] According to one example, the end portion 122 extends in a vertical direction.

[0156] The end portion 122 measures at least 1 cm.

[0157] Preferably, the end portion 122 is at a distance Hcoiffede from the bottom wall 10a.

[0158] According to an example Hcoiffe< Hsurverse, preferably Hcoiffe< 0.8 Hsurverse.

[0159] MATERIALS AND DIMENSIONING

[0160] According to one embodiment, the collection tray 10 is made of one of the following materials: a metal alloy such as stainless steel, cast iron, a plastic.

[0161] According to one embodiment, the bottom wall 10a and the side wall 10b form a single piece made of the same material;

[0162] According to a particular embodiment, the filter screen 11 is generated by openings 101 through the collection tray 10.

[0163] ASSEMBLY METHOD

[0164] According to one embodiment, the invention relates to a method of mounting a collection tray 10 at the mouth of an evacuation conduit 6, under a manhole cover 2.

[0165] In one embodiment, the collection tray 10 is fixed rigidly to the discharge duct 6 by means of bolted elements. In another embodiment, the system 1 comprises a main frame 7 shaped to receive the grid 2 in a removable manner.

[0166] The filtration system 1 may also include a secondary support 71 configured to be fixed rigidly to a wall of the discharge pipe 6. In one embodiment, the collection tank 10 may include a secondary frame 8, preferably made of stainless steel, which may include at least one first fin 8b configured to allow the tank 10 to rest by gravity on a bearing face 71a of the secondary support 71. The collection tank 10 is thus held by gravity within the discharge pipe 6. This has the advantage of eliminating any screws, particularly those subject to rust or deterioration due to the surrounding environment. The secondary frame 8 may also include a second fin 8a configured to support the filter screen 11.

[0167] The secondary support 71 is preferably fixed and / or screwed to the wall of the conduit 6.

[0168] As illustrated in [Fig. 5B], the filtration system 1 advantageously includes at least one stop 9 to prevent the collection tank 10 from rising if a force applied to the collection tank tends to cause it to rise. Indeed, if the drainage pipe is full, water may tend to escape from the pipe by being discharged onto the roadway through the drain. This is the case, for example, in the event of severe flooding or when the pipe is partially blocked. In the absence of a stop 9, the pressure exerted by the water in the pipe has a vertical component that may exceed the weight of the collection tank 10, causing the latter to shift in position. When this pressure ceases, the collection tank 10 may not return to its operating position. The operation of the collection tank 10 and the entire filtration system is then defective.

[0169] The stop 9 is shaped to come into contact on one side with the collection tray 10 and on the other side with the receiving 2. This contact can be permanent, for example when the tray The collection tray 10 and the grid 2 are in position. To ensure this contact, the stop 9 can be equipped with an elastic element such as a spring. Thus, regardless of the exact distance between the collection tray 10 and the grid 2, the elastic element maintains the stop in contact with the collection tray 10 on one side and the grid 2 on the other. Alternatively, the size of the stop 9 can be adjusted to ensure this contact. For example, the stop 9 can be screwed into one of the collection trays 10 and the grid 2, preferably into the collection tray 10.

[0170] Alternatively, the contacts between the stop 9 and the collection tray 10 on the one hand, and the grid on the other, may not be permanent. In this case, a sufficiently small gap will be provided so that the stop 9 quickly closes this gap. The collection tray 10 moves under the effect of a vertical force. Typically, the stop is shaped so as to close this gap when the collection tray 10 moves, under the effect of water pressure, a maximum distance that does not impair its correct repositioning when this pressure ceases and the collection tray 10 descends under the effect of gravity.

[0171] A non-limiting example of a stop 9 will now be described.

[0172] The stop 9 is carried, for example, by the cap 12 as illustrated in [Fig. 5B]. Alternatively, the stop 9 can be carried by a wall of the collection tray 10 or by the grid 2.

[0173] When the stop 9 is supported by the collection tray, the stop 9 preferably includes a bolting element having a bearing head 9a configured to contact the plate 2. The bolting element may be a helical screw so as to allow adjustment of the height of the stop 9 by tightening. In effect, this stop 9 prevents the collection tray from lifting.

[0174] Thus the collection tray 10 remains in place in the evacuation duct 6 relative to the plate 2. In fact, the system 1 does not require screws to fix the collection tray 10 to the duct 6, which avoids problems such as rust or difficulties in dismantling.

[0175] According to a very particular embodiment, the system 1 includes a fill sensor configured to detect the level of obstruction of the filter screen 11. Preferably the fill sensor is configured to transmit a signal, for example by radio waves, to a transmitter in order to warn a maintenance team to empty said tank 10.

[0176] According to a particular embodiment illustrated in [Fig. 5A], the filtration system 1 comprises an additional cap 12' attached to the cap 12. Preferably, the additional cap is positioned above the cap 12 so as to conform the overflow outlet 11b between the cap 12 and the additional cap 12'. In this case, the height hl 1b of the overflow 11b is delimited by this additional cap 12'. For example, hl 1b is measured between this additional 12' cap and the top of the side wall of the collection tank along the vertical and directly above the surface.

[0177] Preferably, the additional cap 12' and the cap 12 form a funnel-shaped surface that can be a shape of revolution.

[0178] The main frame 7 forms a cavity shaped to house the collection tray 10 and which opens into a stormwater drainage pipe 6. The main frame 7 is advantageously made of concrete, but it can also be made of metal. Preferably, the main frame 7 is integral with the roadway. As illustrated in the figures, the main frame 7 may have a surface 7a configured to cooperate with the collection basin 10 so as to extend at least one side wall 10b. In this case, the side wall(s) 10b of the collection basin 10 do not form a closed contour when projected onto a horizontal plane. This contour has an opening. The interaction of the surface 7a and the side wall(s) 10b closes this opening and completes the contour.

[0179] Alternatively, the side wall(s) 10b of the collection tray 10 form a closed contour in projection along a horizontal plane.

[0180] The collection tray 10 can be attached to the frame 7 by means of bolts or clips. Alternatively, the collection tray 10 can simply rest by gravity on the frame 7. Finally, according to yet another alternative, a locking system can secure the collection tray 10 to the frame 7.

[0181] The system 1 includes an intermediate main frame (not shown in the figures), supported by the main frame 7 and which is shaped to support the grid 2 and / or the collection tray 10. The intermediate main frame is made of metal, preferably cast iron.

[0182] The side wall 10b and the cap 12 advantageously form a single monobloc piece, preferably made of a single material, for example cast iron.

[0183] As illustrated in the example of Figures IA and IB, and according to a particular embodiment, the filtration system 1 is positioned at the intersection of a roadway 30 and the sidewalk 31. In this example, the drain cover 2 comprises a first portion 21 and a second portion 22 distinct from the first portion 21. Advantageously, the first portion 21 is at the level of the roadway 30 so as to present a continuity with the level of the roadway 30 so that a vehicle can drive over it.

[0184] The second portion 22 is preferably positioned in continuity with a corner of the sidewalk 31. The water 3 flows preferably from the roadway 30 towards the drainage pipe 6.

[0185] The first portion 21 preferentially forms an angle with the level of the roadway 30, the slope being preferentially in the direction of the sidewalk 31.

[0186] The second portion 22 preferentially having an opening 201 whose section is parallel to the side of the sidewalk 31.

[0187] Preferably, the cap 12 is located under the second portion 22. The second portion 22 has an upper face substantially tangent to the sidewalk 31 and without an opening and a slanted surface forming an obtuse angle relative to the upper face and having at least one opening 201 whose section is in a plane parallel to the side of the sidewalk 31.

[0188] According to a particular embodiment, the overflow outlet 11b is located between the second portion 22 and the top of the cap 12. Preferably the overflow outlet 11b comprises a small opening, preferably less than 30mm in a vertical direction, formed between the distal end 12b of the cap 12 and the free end of the angled surface.

[0189] As illustrated in Figures 2A and 2B, and according to a particular embodiment, the collection basin 10 is positioned under the pavement 30. The filter screen 11 is positioned below the grid 20, which comprises a single portion. Preferably, the grid 20 is located directly above the filter screen 11. The filter screen 11 is preferably located directly above the stormwater pipe 6.

[0190] As illustrated in the example of Figures 3A and 3B and according to another embodiment, the filter screen 11 is positioned below the sidewalk 31.

[0191] FLOW SECTIONS

[0192] The grid 20 presents a flow section Sflux2o defined as the sum of the sections of the openings 201 configured to allow the passage of water.

[0193] The filter screen 11 has a flow section Sflux lodefined as the sum of the sections of the openings 101 configured to allow the passage of water.

[0194] As illustrated in [Fig.4A] and according to one embodiment, the overflow outlet 11b is located above the side wall 10b of the filter screen 11 and has a passage section parameter Psurverse defined as the height allowing the passage of a solid detritus 42.

[0195] As illustrated in Figure 4B and according to a particular embodiment, the overflow outlet 11b has a plurality of elementary openings and thus the passage section parameter Psurverse is defined as the height allowing the passage of a solid detritus 42 through a single elementary opening.

[0196] The overflow outlet 11b has a flow section Sfiuxiib defined as the sum of the sections of the elementary openings configured to allow the passage of water through the overflow outlet 11b.

[0197] Preferably, Sfluxijb >0.7*Sflux i0, preferably Sfluxiib >0.7*Sfluxio.

[0198] According to an example, Sfluxiib > 0.5 * SfluX2o and preferably Sfluxiib > SfluX2o. Thus, preferably, when the filter screen 11 is closed, the system is configured so that the rainwater flow rate passing through the overflow outlet 11b is at least equal to the rainwater flow rate passing through the grate 20 and entering the drain. Thus, all the water entering the drain is discharged through the overflow outlet 11b.

[0199] According to an example Sfluxi0 > Sflux20.

[0200] The present invention is not limited to the examples described above. Many other embodiments are possible, for example by combining features described above, without departing from the scope of the invention.

[0201] Digital references: 1. Filtration system 10. Collection tank 10a. bottom wall 10b. side wall 101. Filter screen openings 11. Filter screen retention zone 11b. Overflow outlet 111b. portion of side wall 12. headdress 12a. proximal end 12b. distal end 2. drain plate 20. grid 20a. upper face 20b. lower face 201. Gate opening 21. First portion 22. Second portion 3. water 3a. road surface 42. Solid debris 6. Stormwater drainage 7. Main frame 7a. Main frame surface 71. Secondary support 71a. support face 8. Secondary framework 8a. second fin 8b. first fin 9. stop 9a. stop element

Claims

1. Demands Rainwater filtration system (1) comprising: - at least one drain plate (2), the plate (2) comprising at least one grate (20) provided with openings (201) and intended to collect water (3) flowing from a floor, - a collection tray (10) located below the grid (20) in a vertical direction and configured to receive the water (3) passing through the grid (20), the collection tray (10) comprising a bottom wall (10a) and at least one side wall (10b), the collection tray (10) comprising at least one filter screen (11) configured to retain solid debris (42) while allowing water to pass through, the filter screen (11) being formed by at least one of the bottom wall (10a) and at least a portion of at least one side wall (10b), the filter screen (11) having openings (101) having a cross-sectional area parameter Pscreen less than a cross-sectional area parameter Pgrie of the openings (201) of the inlet grid (2), the cross-sectional area parameter Pscreen being defined as the maximum diameter of a sphere that can pass through the openings (101, 201) of the filter screen (11) and respectively of the drain grid (2), - at least one overflow outlet (11b), having at least one passage cross-section parameter PoverflowSe^ 6 * Pscreen, Poverflow being defined as the maximum diameter of a sphere that can pass through the overflow (11b), the overflow outlet (11b) being shaped so as to allow the water to be discharged by overflow from the collection tank (10) by passing over at least part of the filter screen (11) and preferably over the entire filter screen (11), - at least one cap (12), having a proximal end (12a) located on the side wall (10b) and under the overflow outlet (11b) and a free distal end (12b) extending into the interior of the collection tank (10),so as to define with the bottom wall (10a) and the side wall (10b) a retention zone (lia) shaped to prevent debris (42) from accessing the overflow outlet (11b) by going up along the portion (111b) of the side wall (10b) located under the cover (12), System (1) is characterized in that it comprises: - at least one stop (9) configured to prevent the collection tray (10) from rising if a force applied to the collection tray tends to make it rise.

2. A filtration system (1) according to the preceding claim, wherein the passage area parameter Pscreen and the passage area parameter Pscreen are such that Pscreen < 0.7 * Pscreen and preferably Pscreen < 0.5 * Pscreen and preferably Pscreen < 0.3 * Pscreen.

3. Filtration system (1) according to any one of the preceding claims wherein the passage section parameter PCTantel is Pécran < 8 mm and wherein, preferably, the passage section parameter PsurverSe > 50 mm.

4. Filtration system (1) according to any one of the preceding claims wherein the overflow outlet (11b) is located at a distance Hoverflow from the bottom wall of the collection tank (10), such that HoverflowSe^ 0.5 * Htotai, Htotai being the vertical dimension, taken at the overflow outlet (11b) between the bottom wall of the collection tank (10) and a lower surface (20b) of the grid (20), Hoverflow and Htotai being measured along the vertical, Hoverflow being measured at the lowest point of the overflow outlet (11b), preferably Hoverflow> 0.6 * Htotai, and preferably Hoverflow> 0.7 * Htotai.

5. Filtration system (1) according to any one of the preceding claims wherein the bottom wall (10a) is located, in a vertical direction, more than 5 cm from the lower surface (20b) of the grid (20) such that Htotai >15 cm with Ht otai being the vertical dimension, taken at the overflow (11b) between the bottom wall of the collection tank (10) and a lower surface (20b) of the grid (20), HsurVerSeet Htotai being measured along the vertical, Hsurverse being measured at the lowest point of the overflow outlet (11b), and preferably Htotal >20 cm.

6. A filtration system (1) according to any one of claims 1 to 5, wherein the bottom wall (10a) is located, in a vertical direction, at least 15 cm from the screen (20), such that Htotai < 15 cm, where Htotai is the vertical dimension taken at the overflow (11b) between the bottom wall of the collection tank (10) and a lower surface (20b) of the screen (20), Hoverflow and Htotai being measured vertically, Hoverflow being measured at the lowest point of the overflow outlet (11b), and preferably Htotai < 20 cm

7. Filtration system (1) according to any one of the preceding claims wherein at least one overflow outlet (11b) has an overflow outlet height hnb of between 5 cm and 30 cm and preferably of between 5 cm and 10 cm.

8. Filtration system (1) according to any one of the preceding claims wherein the stop (9) is configured to come into contact on one side with the collection tray (10) and on the other side with the grid (20).

9. Filtration system (1) according to any one of the preceding claims wherein the cap (12) has a proximal end (12a), a distal end (12b) and a main portion (121) extending from its proximal end (12a) and an end portion (122) extending from its distal end (12b), the end portion (122) forming an angle with the main portion (121) such that the end portion (122) approaches a bottom wall (10b) of the collection tank (10) as it approaches the distal end (12b), the end portion (122) preferably being vertical.

10. Filtration system (1) according to any one of the preceding claims comprising an additional cap (12') integral with the cap (12), the additional cap (12') surmounting the cap (12) so as to conform the overflow outlet (11b) between the cap 12 and the additional cap 12'.

11. Filtration system (1) according to any one of the preceding claims wherein the cap (12) extends transversely over a width Lcap, such that Lcap > 0.7 * Loverflow, Loverflow being the width of the overflow outlet (11b), Lcap and Loverflow being measured horizontally, preferably 0.9 * Loverflow < Lcap < 1.1 * Loverflow.

12. Filtration system (1) according to any one of the preceding claims wherein the cap (12) is shaped so that, in projection onto a vertical plane, its distal end (12b) is located below its proximal end (12a).

13. Filtration system (1) according to any one of the preceding claims wherein the grid (2) and the collection tray (10) are two removable elements.

14. A filtration system (1) according to any one of the preceding claims comprising a main frame (7) shaped to to receive the grid (20) in a removable manner, and in which, preferably, the main frame (7) forms a cavity shaped to house the collection tray (10) and which opens into a rainwater drainage pipe (6).

15. Filtration system (1) according to the preceding claim in which the main frame (7) has a surface (7a) configured to cooperate with the collection tray (10) so as to extend at least one side wall (10b).

16. Filtration system (1) according to any one of the two preceding claims comprising an intermediate main frame, supported by the main frame (7) and which is shaped to support the grid (2) and / or the collection tray (10).

17. Filtration system (1) according to any one of the preceding claims wherein the side wall (10b) and the cap (12) form a single, single piece, preferably made of a single material, for example stainless steel, the cap (12) comprising for example a portion of folded sheet metal.

18. Filtration system (1) according to any one of the preceding claims in which the plate (2) has a first portion (21) configured to be positioned so as to extend in continuity with a roadway (30) and a second portion (22) distinct from the first portion (21), configured to be positioned at the height of a sidewalk (31), the two portions (21, 22) being separable.

19. Filtration system (1) according to any one of the preceding claims wherein the plate (2) has a first surface (20a) configured to be positioned at the height of the level of a sidewalk (31) and a second surface (2b) inclined relative to the upper surface of the sidewalk (31) having openings (201).

20. Filtration system (1) according to any one of the preceding claims comprising a fill sensor configured to detect a level of clogging of the filter screen (11).

21. A method for making a rainwater filtration system (1) according to any one of claims 1 to 20, the method comprising the following steps: positioning of the collection tray (10) in a housing forming an inlet of a rainwater drainage pipe (6) (3), positioning of the drain plate (2) comprising at least the grid (20) with openings (201) above the collection tray (10), so as to close the opening of the pipe (6), the grid (20) being positioned at a distance from at least one side wall (10b) so as to form said overflow outlet (11b).

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