Building assembly and regulation unit for use in a building assembly

Abstract

Shown and described is a building arrangement (1) with at least one building (3) having a roof and / or facade area (2), with at least one retention unit (4) having a water-storing material (6) for at least temporarily storing rainwater (5) from the roof and / or facade area in the water-storing material (5) and with at least one regulating unit (8) for regulating the feed of rainwater (5) into the retention unit (4).According to the invention, the regulating unit (8) has a water reservoir (11), at least one supply line (9) for filling the water reservoir (11) during a filling phase with rainwater (5) from the roof and / or facade surface (2) and at least one discharge line (14) for emptying the water reservoir (11) during an emptying phase, wherein rainwater (5) drained from the water reservoir (11) during the emptying phase can be fed to the retention unit (4) for temporary storage in the water-storing material (6) and wherein the regulating unit (8) for emptying the water reservoir (11) is designed according to the siphoning principle.

Description

[0001] The invention relates to a building arrangement comprising at least one building having a roof and / or facade surface, at least one retention unit comprising a water-storing material for at least temporarily storing rainwater from the roof and / or facade surface in the water-storing material, and at least one regulating unit for regulating the feed of rainwater into the retention unit. Furthermore, the present invention relates to a regulating unit for use in a building arrangement and an arrangement comprising at least one regulating unit and at least one retention unit.

[0002] The technical field of application of the invention lies in the field of construction technology, especially in the field of facade surfaces of buildings, whereby the term "building" in the sense of the invention is to be interpreted broadly and can be understood in particular as residential or commercial buildings, industrial halls, soundproof walls, bridges or the like.

[0003] Measures to retain rainwater and protect against flooding are becoming increasingly important for architects, urban planners and builders, as extreme events such as heavy rainfall and flooding are becoming more frequent as a result of climate change.

[0004] Cities are particularly important in this regard. Due to increasing urbanization, these areas are characterized by high building density and a high degree of sealing. This high degree of sealing, low infiltration potential, and increasing soil compaction exacerbate the impacts of heavy rainfall events.

[0005] In the field of rainwater retention, various state-of-the-art measures exist. These include unsealing surfaces, above-ground or subterranean infiltration measures, above-ground retention (in open water bodies, ditches, retention basins, on roofs, etc.), subterranean retention (in cisterns, trenches, etc.), or temporary retention on traffic areas, on green spaces, and through green roofs and tree planting. In addition, there are direct building protection measures, such as sewer backflow protection or waterproofing. These measures achieve various effects. On the one hand, water ingress is prevented. On the other, water infiltration is facilitated, water is introduced at a later time, or water is diverted.

[0006] Green roofs and retention roofs are increasingly being used in urban areas, with the latter primarily designed to retain rainwater. The substrate depth and the quality of the drainage layer of retention roofs are influential factors in achieving water retention. This allows water to be diverted over long distances and delay runoff. Many existing buildings are unsuitable for retention roofs due to structural requirements, as the overall weight increases with increasing water storage capacity. As a rough approximation, the overall weight of extensive green roofs is approximately 50 to 70 kg / m², while intensive green roof gardens can reach over 1,000 kg / m².During heavy rainfall events, green roofs are a building block of an optimized urban rainwater management system in terms of retention capacity, but they can reach their limits because the percentage of rainwater retention decreases with increasing rainfall intensity and the additional rainfall is subsequently passed on directly and without delay.

[0007] In the field of urban planning and development, innovative drainage concepts are being developed worldwide. These concepts focus on the infiltration and drainage of rainwater. Playgrounds, sports facilities, and other public spaces are being planned as staggered areas. By lowering the areas and adjusting the gradient, they serve as temporary water basins.

[0008] Such measures usually require complex and costly construction work. Larger areas must be redesigned and roads incorporated. The scope for action usually relates to public areas, and private land can hardly be integrated into the planning for these measures.

[0009] Measures for rainwater retention on facade surfaces can also be seen in vertical greening concepts, as plants and substrates absorb rainwater and / or use it for irrigation. However, in these vertically installed gardens, rainwater retention only occurs in a secondary and minor way. Large-scale facade gardens are also rare due to the high installation and maintenance costs, and their high weight makes them unsuitable for rainwater retention.

[0010] Such vertical gardens are usually only installed in the form of individual projects as art or advertising objects.

[0011] EP 4 053 348 A1 already discloses a retention system for retaining rainwater, particularly during heavy rainfall events, in densely populated urban areas. A preferred embodiment of the known retention system provides, in particular, for the use of vertically arranged, modular retention units, which can be used as cassette elements consisting of a load-bearing outer shell and a water-storing core made of mineral materials, on building walls or as freestanding sculptural elements. Water storage takes place in a water-storing material of the retention unit.

[0012] A retention unit of the retention arrangement known from EP 4 053 348 A1 can be connected to a roof and / or facade surface of a building of a building arrangement for draining rainwater to the retention arrangement and for at least temporarily storing drained rainwater in the retention arrangement.

[0013] The retention unit can form a retention façade of a building in the building complex. However, it is also possible for the retention system to receive rainwater from other neighboring buildings, industrial halls, soundproof walls, bridges, or the like via a suitable piping system.

[0014] For supplying rainwater, the retention arrangement known from EP 4 053 348 A1 can have at least one technical device which is designed for the directed and / or forced and / or controlled and / or regulated supply of rainwater to and / or into the retention arrangement.

[0015] During heavy rainfall, significant amounts of precipitation can occur in a short period of time, which cannot be absorbed by the water-storing material if fed directly into the retention unit, or only in insufficient quantities. Furthermore, depending on the type of rainwater feed into the retention unit, areas may form within the retention unit that the rainwater bypasses when entering the retention unit, thus preventing them from contributing to the retention unit's retention capacity. For optimal distribution and absorption of rainwater in the water-storing material of the retention unit, it is therefore important to feed the water quantities accumulating via roof and / or facade surfaces into the retention unit as evenly as possible, i.e., with the most consistent volume flow possible and, if possible, without load peaks.

[0016] Various methods are known from wastewater management for equalizing volume flows, particularly with regard to a discontinuous volume flow in the input and a constant or defined volume flow in the output.

[0017] To prevent flooding during heavy rainfall, stormwater overflow basins, above-ground or underground tanks, trenches, or similar structures are used to collect and store excess water. The water can flow intermittently into a water reservoir, depending on the amount of rainfall. When the rainfall is over and the drainage system is transporting less water, the stored water is released back into the system. The volume flow at the outlet is usually constant and is determined by the size of the outlet and other factors.

[0018] Stormwater overflow basins are also used for stormwater treatment and for the settling of pollutants. Usually in combination with pumping stations and, if necessary, additional retention basins to achieve a more even flow.

[0019] To equalize inflow flows, equalization and storage tanks are used in the wastewater systems of all major industrial sites. This can be done close to the process, i.e., at wastewater generators, or as upstream or intermediate stations in wastewater treatment plants.

[0020] In addition, there are flow-through systems for wastewater treatment that also create a more uniform flow rate. Since wastewater must be cleaned and treated according to legal requirements before being discharged into the sewer system, the water is buffered in a storage tank to achieve uniformity in concentration and flow rate. A pumping station then raises the wastewater to the inlet height of a flow-through system. It then flows through the system under free gravity without any shear stress. Depending on the available height and the type of sludge formed, this can be separated from the wastewater using a settling cyclone or a compact clarifier. The sedimented wet sludge is then further compacted in a sludge thickener.

[0021] The object of the present invention is to provide a technically simple, cost-effective and low-maintenance option for a directed and / or forced supply of rainwater to at least one retention unit of a building arrangement for the at least temporary storage of rainwater in a water-storing material of the retention unit, wherein the amount of water accumulating via the roof and / or facade surface and supplied to the retention unit via a roof and / or facade drainage system can be optimally distributed, defined and fed into the retention unit with as constant a volume flow and / or constant flow velocity as possible.

[0022] Furthermore, it is an object of the present invention to provide a regulating unit for supplying rainwater to a water-storing material of a retention unit of a building arrangement for the at least temporary storage of the rainwater in the water-storing material, which allows for an equalization of the accumulating amounts of precipitation for a defined and uniform supply to the retention unit in a technically simple, cost-effective and low-maintenance manner.

[0023] Furthermore, it is an object of the present invention to regulate and equalize the discharge of rainwater from the regulating unit in a simple manner.

[0024] The aforementioned objects are achieved according to the invention by a building arrangement having the features of independent claim 1, by a regulating unit having the features of claim 13, and by an arrangement having at least one regulating unit and at least one retention unit having the features of claim 15. Advantageous embodiments of the invention are the subject of the dependent claims.

[0025] According to the invention, a regulating unit is proposed for regulating the feed of rainwater into the retention unit, which has a water reservoir, at least one supply line for filling the water reservoir during a filling phase with rainwater from the roof and / or facade surface of the building and at least one discharge line for emptying the water reservoir during an emptying phase, wherein the rainwater drained from the water reservoir during the emptying phase can be fed to the retention unit for temporary storage in the water-storing material and wherein the regulating unit for emptying the water reservoir is designed according to the siphoning principle.

[0026] The regulating unit according to the invention is designed for use in a building arrangement of the type according to the invention and comprises a siphon with at least one siphon pipe for emptying a water reservoir of the regulating unit. The water reservoir, which is intended to collect rainwater from a roof and / or facade surface of the building, is connected to a roof and / or facade drainage system of the building via at least one water-carrying connection and / or pipe.

[0027] The regulating unit is further connected or linked to a water distribution device, for example a water distribution system consisting of pipes with a central inlet and outlet holes on the underside, in order to feed the rainwater drained from the water reservoir during the emptying phase evenly into the retention unit or to supply it in an evenly distributed manner to the water-storing material of the retention unit.

[0028] The invention proposes for the first time a system with a regulating unit for regulating the feed of rainwater into a retention unit of a retention arrangement, in which a water-storing container of the regulating unit is provided as a water reservoir for collecting rainwater and the emptying of the container is based on the technology of the Pythagorean cup or the siphon principle.

[0029] The technique of the Pythagorean cup or the siphon principle is basically known to the person skilled in the art, but is proposed for the first time according to the invention for the regulation of the water feed of rainwater into retention units of a retention arrangement.

[0030] With the siphoning principle, the rainwater stored in the water-storing tank of the regulating unit is drained via at least one siphoning device and solely by utilizing hydrostatic pressure. Utilizing the siphoning principle, the water reservoir of the regulating unit is emptied automatically at intervals in a surge, without the need for monitoring.

[0031] The siphon can be formed by a U-shaped siphon pipe having a suction line and a discharge line connected to the suction line via a line bend. The suction line has an opening at the free end adjacent to the tank bottom, which forms the siphon inlet. The suction line extends upwards in the water reservoir from the siphon inlet and, at a certain distance from the tank bottom, merges into the line bend, to which the discharge line is connected. The discharge line extends inside the water tank, preferably parallel to the suction line, downwards from the line bend and is led through the tank bottom of the water reservoir to the outside. At the free end outside the tank, the discharge line has a siphon outlet.To empty the tank, the water level must first rise when the reservoir fills, which leads to a simultaneous rise in the water column in the suction line according to the principle of communicating pipes. When the water column in the suction line reaches the height of the pipe bend, the rainwater overflows into the drain, and the tank is subsequently automatically emptied via the suction line and drain until the water level in the reservoir drops to the level of the siphon inlet. At this point, the water column breaks off, and the emptying process automatically stops.

[0032] In another embodiment of a siphon, the siphon tube can also be formed by a water level tube extending through the tank bottom, onto which a bell is placed. Emptying occurs via the water level tube when the water in the bell rises during the filling of the water reservoir and reaches an opening in the water level tube below the bell, allowing the water to overflow into the water level tube.

[0033] At the siphon inlet of a siphon pipe, a stop mechanism with at least one stop element is formed, which leads to a safe interruption of the suction via the siphon, which is particularly advantageous when the inlet volume flow into the water reservoir and the siphon volume flow with which the water reservoir is emptied are close to each other.

[0034] In particular, the stop element can be flooded with rainwater when the water reservoir is filled and is then at least partially emptied when the water reservoir is emptied using a siphon pipe of the siphon.

[0035] The stop element can be designed as a buoyancy body, wherein a change in position of the stop element is caused by buoyancy forces in the surrounding rainwater of the water reservoir.

[0036] In particular, the suction of ambient air via the stop element into the siphoning pipe results in an interruption of the emptying of the water reservoir via the siphoning pipe.

[0037] The regulating unit according to the invention accordingly comprises a siphon with at least one siphon pipe for emptying the water reservoir, wherein a stop mechanism with at least one stop element is provided at the siphon inlet of the siphon pipe for safely interrupting the suction via the siphon pipe.

[0038] The stop mechanism can, in particular, comprise a cup as a stop element that is closed at the bottom and sides and open at the top. If the water level in the reservoir rises when filled with rainwater, the cup is flooded.

[0039] The cup is partially positioned below a siphoning pipe of the siphon, with the siphoning pipe's inlet dipping into the cup from above. When the water reservoir is emptied, the cup is then at least partially emptied along with the siphoning pipe.

[0040] If the water level in the reservoir drops below the upper rim of the cup or the inlet height of the cup during emptying, the siphon inlet is sealed off from the water level in the reservoir by the bottom and sides of the cup. Rainwater cannot then flow from the reservoir into the cup, and the suction of rainwater via the siphon pipe is interrupted.

[0041] In particular, a change in position of the stop element relative to the siphon inlet can be brought about by buoyancy forces acting on the stop element. Preferably, the density of a cup provided as a stop element or of the cup material can be greater than the density of the rainwater, wherein the density of the cup material can be, for example, between 1.2 and 1.6 g / cm 3 , in particular between 1.35 and 1.5 g / cm 3 . For example, the cup can be made of a plastic material, furthermore, for example, of polyvinyl chloride. If the water level in the water reservoir falls below the fill level of the upper rim of the cup or below the inlet height of the cup when the water reservoir is being emptied, water is sucked out of the cup via the siphon inlet of the siphon pipe, so that the water level in the cup drops and the cup can rise due to its buoyancy in the surrounding rainwater of the water reservoir.This ensures that the cup is essentially completely emptied via the siphon tube. It also ensures that the siphon's suction action is safely interrupted.

[0042] Particularly preferably, the suction of ambient air via the stop element into the siphon pipe can result in an interruption in the emptying of the water reservoir via the siphon. The siphon can, for example, have at least two siphon pipes that are at different distances from the container bottom of the water reservoir. In particular, a first siphon pipe with a larger line diameter and a second siphon pipe with a smaller line diameter can be provided. The siphon pipes open into a common outlet line of the siphon. The siphon inlet of the second siphon pipe can be at a greater distance from the container bottom of the water reservoir than the siphon inlet of the first siphon pipe. A stop mechanism with a cup as a stopper element can be formed at the siphon inlet of the second siphon pipe.If the water level in the reservoir drops below the upper rim of the cup or the inlet height of the cup during emptying, water is sucked out of the cup through the siphon inlet of the second siphon pipe. If the water level in the cup drops below the siphon inlet of the second siphon pipe, air can be sucked in through the second siphon pipe, which can then interrupt the suction of precipitation water through the first siphon pipe.

[0043] Since no movable components are required for emptying the water reservoir and supplying the rainwater drained from the water reservoir to the retention unit, and an electrical power supply is unnecessary, the control unit provided according to the invention can be provided as a structurally simple and self-sufficient unit that can be easily used at different locations.

[0044] In particular, the Pythagorean cup technique, or the siphoning principle, enables energy-independent emptying of the regulating unit's water reservoir and the supply of rainwater to the retention unit without the need for motor drive power for pumps. Emptying or feeding rainwater into the retention unit requires no mechanically moving elements / components, resulting in a technically simple, cost-effective, and low-maintenance water supply option.

[0045] According to the invention, the regulating unit is designed for vertical water retention or water retention in the water reservoir or water storage of the regulating unit until the beginning of the emptying phase of the water reservoir and for equalizing the amount of precipitation to be fed to the retention unit, particularly during heavy rainfall events. Emptying via the water reservoir's drainage can occur, in particular, at essentially the same flow velocity and the same volume flow of the precipitation water. In particular, the precipitation water can be fed at a uniform volume flow from the regulating unit to a water distribution device, via which the water is fed to the retention unit.

[0046] According to the invention, the water reservoir is emptied with a time delay or in pulses after the start of the filling phase of the water reservoir and only after a predetermined filling level of the water reservoir has been reached.

[0047] By draining the water reservoir using the siphoning principle, peak loads in the water supply to the retention unit can be avoided. Rainwater is retained in the reservoir until a predetermined fill level is reached, and only when this level is reached is the rainwater drained from the reservoir via the siphoning pipe.

[0048] To ensure a uniform water supply to the retention unit, a water distribution device can be connected to the regulating unit. The distribution device can be designed as a pipe arrangement with perforated pipes or as a slotted plate or the like. Optimal, fast, efficient, and uniform water distribution can be promoted through the targeted design of the outlet holes in the pipes or slots in the slotted plate, i.e., the number, placement, dimensions, and / or shape of the outlet holes or slots. The rainwater is fed to the distribution device via the discharge from the water reservoir of the regulating unit, and from there, it is fed into the retention unit with as much uniform distribution as possible.

[0049] The water distribution device and the control unit can be firmly connected to each other and form a compact unit.

[0050] The rainwater can be fed into the retention unit unaltered from the regulating unit and, if necessary, via the water distribution device, or additives, pH regulators, and / or water purifying substances or other substances can be added to the rainwater before feeding using a dosing device. The dosing device can be connected to the regulating unit and / or the retention unit and form a compact component unit with the regulating unit and / or the retention unit.

[0051] In addition, strainers or similar devices can be installed, particularly without having to adapt or modify the design of the retention unit. In this context, the regulating unit can have a filter device for pre-filtering the rainwater before or upon feeding it into the water reservoir and / or a strainer, and / or be connectable to a filter device or strainer.

[0052] It is particularly advantageous if the regulation unit is a separate module from the retention unit, consisting of a water reservoir, a supply and discharge line, and possibly other components. While the regulation unit can be fluidically or flow-conductingly connected to the retention unit, particularly with the interposition of a water distribution device, it can be independently maintained or equipped with additional functions. The regulation unit then forms a structural unit that can be decoupled from the retention unit. By designing the regulation unit as a standalone modular structure, a flexible modular design is possible.In particular, the dimensions of the water reservoir and the design of a water distribution unit can be easily adapted to the structural conditions of the building arrangement according to the invention, in particular to different amounts of precipitation that must be absorbed by the regulating unit and passed on to at least one retention unit.

[0053] The retention unit can also be designed in a modular manner, in particular wherein the retention unit comprises a supporting outer shell and a water-storing filling, and the water-storing filling can consist of at least one mineral material and / or comprise at least one mineral material. In particular, a water-storing material selected from the group of granules, in particular pumice granules and / or lava granules, and / or perlite, can be used as the water-storing filling.

[0054] The grain size of the granules can be between 0.5 and 40 mm, preferably up to 10 mm, more preferably up to 2 mm. Depending on the grain size, the bulk density of the granules can be between 50 and 2,000 kg / m 3 , preferably between 700 and 1,400 kg / m 3 , in particular between 850 and 1,250 kg / m 3 or between 80 and 800 kg / m 3 .

[0055] The bulk density of perlite, for example, is approximately 85 kg / m³. The bulk density of sand, for example, is 1,400 kg / m³. In particular, the bulk density can be at least 800 kg / m³ if, for example, pumice or lava granules are used as water storage materials.

[0056] Typical values ​​for the water storage capacity of the water storage material can be in the range between 30 wt% and 300 wt% if, for example, pumice or lava granules are used as water storage material.

[0057] When storing water in a porous water storage material, the time until the maximum water mass is stored in the pore structure can be less than 1 hour, preferably less than 30 minutes, more preferably 15 minutes and / or more than 10 minutes.

[0058] In the case of a porous water storage material, water can escape from the retention unit by gravity, wherein at least 80% by weight, preferably at least 90% by weight, more preferably at least 95% by weight, of the water stored in the retention unit can be stored in the retention unit over a water retention period of at least 10 minutes, preferably of at least 15 minutes, more preferably of at least 20 minutes, particularly preferably of at least 1 hour.

[0059] The residual moisture content of a retention unit after water leakage may be less than 20 wt.%, preferably less than 15 wt.%.

[0060] Particularly preferably, the retention unit can comprise or be formed from at least one self-supporting structural element, in particular designed as a bulk material cassette or lattice girder, into which a water-storing material, in particular selected from the group of granules and / or mineral materials, further in particular selected from the group of pumice or lava granules, is accommodated as bulk material. The structural element can have openings for ventilation, in particular for the flow of ambient air through a bed of water-storage material and / or for the passage of water into and / or out of the bed. Liquid water can also flow or drip through the openings when the water-storage material is saturated.

[0061] For further advantageous features of retention units or retention modules designed as bulk material cassettes with water-storing fill, reference is made to the disclosure content of paragraphs

[0074] to

[0081] of EP 4 053 348 A1. The disclosure content of the aforementioned passages of EP 4 053 348 A1 is expressly incorporated into the disclosure content of the present invention as being in accordance with the invention.

[0062] The feeding of rainwater from the regulating unit into the retention unit preferably takes place from above onto a water-storing material of the retention unit, in particular in drop form and / or with the same volume flow, via a plurality of outlet openings or slots of a water distribution device.

[0063] A plurality of retention units, particularly modular ones, can be fluidically connected to one another to retain rainwater in several retention units, whereby the fluidically connected retention units can form a retention network. Each retention unit of the retention network can have a supporting outer shell into which a fill of a water-storing material is inserted. The water-storing fill can consist of at least one mineral and / or comprise a mineral material.

[0064] Preferably, all retention units of a retention system are modular in design, with each retention unit forming a preferably replaceable and self-contained functional unit within the retention system. The retention units can then be fluidically connected to one another via supply and discharge lines. All retention units of a retention system can be of the same design.

[0065] Furthermore, the retention unit can be attached and / or held to a building wall of the building and then forms, in particular in the retention composite, a (partial) facade surface of the building.

[0066] Alternatively, the retention unit can also be arranged freestanding, i.e., not structurally connected to the building or attached to it. The retention unit can form a freestanding sculptural element or a piece of refrigeration equipment, such as a cooling fountain or cooling island.

[0067] Water distribution or forwarding from one retention unit to several other retention units within a retention network is possible and advantageous, especially for temporarily storing large amounts of precipitation during heavy rainfall events in a retention system with multiple retention units. Rainwater can be fed to several retention units for temporary storage using a control unit during the drainage phase.

[0068] The regulating unit is preferably arranged above at least one retention unit of the building arrangement, in particular above a plurality of retention units, and more particularly above all retention units of the building arrangement. For example, a retention network can be formed by a series of retention units arranged vertically one above the other, which can be fed with rainwater by a common regulating unit. The regulating unit is then preferably arranged above the uppermost retention unit of a series of retention units arranged vertically one above the other in a retention network.

[0069] In principle, it is also possible for a regulating unit to be arranged or (interposed) between at least two retention units spaced apart from one another in the vertical direction.

[0070] The dimensioning of the regulation unit's water reservoir depends on the amount of rainwater to be collected, which is particularly dependent on the heavy rainfall quantities calculated by the German Meteorological Service (DWD) in relation to the connected roof and / or facade area. The DWD's heavy rainfall classification distinguishes between heavy rain (water volumes of 15 to 25 l / m² in one hour or 20 to 35 l / m² in six hours), severe heavy rain (water volumes of 25 to 40 l / m² in one hour or 35 to 60 l / m² in six hours), and extremely heavy heavy rain (water volumes of more than 40 l / m² in one hour or more than 60 l / m² in six hours).

[0071] For uniform water distribution and water feed into the retention unit, the siphoning system is particularly designed or configured for a volume flow of rainwater supplied to the water reservoir of preferably at least 5 l / (h*m 2< ) and preferably at most 250 l / (h*m 2< ), more preferably between at least 10 l / (h*m 2< ) and at most 100 l / (h*m 2< ), based on the area in [m 2< ] of a rain collection surface connected or connectable to the regulating unit, in particular a roof and / or facade surface of a building. The design is selected such that if the supplied volume flow of rainwater is below the minimum value, emptying according to the siphoning principle via the siphoning pipe does not start completely.If the water supply exceeds the maximum value, the emptying capacity of the regulating unit designed as a siphon is not sufficient to discharge the volume flow supplied to the water reservoir without the water reservoir filling up further.

[0072] It is particularly advantageous for the arrangement of the regulating unit as an independent module in a retention network with several retention units if the total storage volume of the water reservoir, based on the area in [m2] of a rain collection area connected or connectable to the regulating unit, in particular a roof and / or facade area of ​​a building, is between 1 l / m 2< and 5 l / m 2< , preferably between 2 l / m 2< and 3 l / m 2< .

[0073] It is also advantageous if the net volume of rainwater drained from the water reservoir during a draining phase, based on the area in [m 2 ] of a rain collection area connected or connectable to the control unit, in particular a roof and / or facade area of ​​a building, is between 1 l / m 2 and 3 l / m 2 , preferably between 1.5 l / m 2 and 2 l / m 2 , further based on the completion of the filling of the water reservoir at the start of the draining phase. The net volume is determined by stopping the water flow to the water reservoir after the siphon has started or the water reservoir has been drained according to the siphon principle via the siphon pipe and determining the volume that the siphon has drained from the water reservoir.

[0074] The net emptying time of the water reservoir during a draining phase can be between 30 seconds and 120 seconds, preferably approximately 60 seconds, based on the completion of filling of the water reservoir at the beginning of the draining phase. The net emptying time refers to the time the siphon operates after starting, provided no further water is added to the water reservoir.

[0075] The net volume and the net emptying time result in a net emptying capacity of the siphoning system implemented with the regulating unit based on the area of ​​a control collecting area connected or connectable to the regulating unit, in particular a roof and / or facade area of ​​a building, preferably between 20 l / (m 2< *h) and 250 l / (m 2< *h), more preferably between 40 l / (m 2< *h) and 120 l / (m 2< *h), particularly preferably between 60 l / (m 2< *h) and 100 l / (m 2< *h), in particular between 80 l / (m2*h) and 100 l / (m 2< *h).

[0076] To adjust the net volume, net discharge time, and / or net output of the control unit, it can also be equipped with multiple siphon pipes, which can be of the same or different dimensions. For example, multiple siphon pipes with different pipe diameters can be provided. If multiple siphon pipes are used, the respective siphon inlet can also be located at different fill levels in the water reservoir. This makes it easy to respond to varying amounts of precipitation that can be fed into the water reservoir during heavy rainfall events.

[0077] A first siphoning pipe with a larger pipe diameter can also be provided, the siphoning inlet of which is further away from the bottom of the water reservoir than the siphoning inlet of a second siphoning pipe with a preferably smaller pipe diameter, the second siphoning pipe being used for the residual emptying of the container.

[0078] Furthermore, an overflow can be installed at the reservoir, through which the rainwater is drained if the net capacity of the regulating unit is insufficient to protect the reservoir from overflow during high rainfall. The overflow can be implemented via a separate overflow pipe located above the siphon pipe. The overflow can be hydrostatically connected to the water discharge of the downpipe.

[0079] Furthermore, the container forming the water reservoir may have a drip drain at the bottom of the container for residual emptying of the container.

[0080] Further aspects of the present invention relate to the following features with reference to the embodiment described below by way of example with reference to the drawing: According to a further aspect of the invention, in a building arrangement, it can be provided that the regulating unit (8) is of modular design and forms a structural unit that can be decoupled from the retention unit (4). According to a further aspect of the invention, in a building arrangement, it can be provided that a water distribution device (23) connected to the regulating unit (8) is provided. According to a further aspect of the invention, in a building arrangement, it can be provided that rainwater (5) from the water reservoir (11) of the regulating unit (8) can be fed to a plurality of retention units (4) for temporary storage. According to a further aspect of the invention, in a building arrangement, it can be provided that the regulating unit (8) is arranged above a plurality of retention units (4) of the building arrangement (1), more particularly above all retention units (4) of the building arrangement (1).According to a further aspect of the invention, it can be provided in a regulating unit that the total storage volume of the water reservoir (11) based on the area in [m 2< ] of a rain collection surface connected or connectable to the regulating unit (8), in particular a roof and / or facade surface of a building (3), is between 1 l / m 2< and 5 l / m 2< , preferably between 2 l / m 2< and 3 l / m 2< .According to a further aspect of the invention, it can be provided in a regulating unit that the net volume of the rainwater (5) drained from the water reservoir (11) during an emptying phase, based on the area in [m 2< ] of a rain collection surface connected or connectable to the regulating unit (8), in particular a roof and / or facade surface of a building (3), is between 1 l / m 2< and 3 l / m 2< , preferably between 1.5 l / m 2< and 2 l / m 2< , further based on an end to the filling of the water reservoir (11) with the start of the emptying phase. According to a further aspect of the invention, it can be provided in a regulating unit that the siphon is designed for a net emptying time of the water reservoir (11) during an emptying phase between 30 s and 120 s, preferably 60 s, based on a completion of the filling of the water reservoir (11) with the start of the emptying phase.According to a further aspect of the invention, it can be provided in a regulating unit that the net emptying capacity of the siphon, based on the area in [m 2< ] of a rain collection area connected or connectable to the regulating unit (8), in particular a roof and / or facade area of ​​a building (3), is between 30 l / (m 2< *h) and 400 l / (m 2< *h), preferably between 60 l / (m 2< *h) and 120 l / (m 2< *h), more preferably between 80 l / (m 2< *h) and 100 l / (m 2< *h).

[0081] A preferred embodiment of the invention is described below by way of example with reference to the drawing. In the drawing: Fig. 1 is a schematic representation of a building arrangement according to the invention with a building and with a plurality of retention units arranged one above the other in vertical rows for retaining rainwater, wherein each retention row is assigned a regulating unit for vertical water retention and for equalizing the amount of precipitation supplied to the retention units arranged one above the other vertically; Fig. 2 is a schematic representation of an arrangement according to the invention with a regulating unit and with a retention unit; Fig. 3 is a schematic representation of a filling phase and a subsequent emptying phase of a regulating unit according to the invention; Fig. 4 is a schematic representation of an embodiment of a regulating unit; Fig. 5 is a schematic representation of another embodiment of a regulating unit; Fig.6 a schematic representation of an embodiment of a regulating unit according to the invention with a siphon having a siphon tube during the emptying phase of the regulating unit and with a stop mechanism for safely interrupting the suction via the siphon tube; Fig. 7 of the in . Figur 6 shown stop mechanism after completion of the emptying phase of the regulating unit; Fig. 8 a schematic representation of an embodiment of a regulating unit according to the invention with a siphon having two siphon tubes during the emptying phase of the regulating unit and with a stop mechanism for safely interrupting the suction via the siphon tubes and Fig. 9 the in Figur 8 shown stop mechanism after completion of the emptying phase of the control unit.

[0082] In Fig. 1 is shown schematically a building arrangement 1 with at least one building 3 having a roof area 2. On the outside of the building 3, retention units 4 arranged in vertical rows one above the other are provided for retaining rainwater 5 in a water-storing material 6 of the retention units 4. As in Fig. 1 As shown, the retention units 4 are attached and / or held to a building wall of the building 3 and form partial facade surfaces of the building 3 in the retention composite. Otherwise, all retention units 4 can be designed identically.

[0083] As in Fig. 2 As shown, each retention unit 4 can be formed from a supporting body 7 as an outer shell and a filling in the body made of the water-storing material 6. The water-storing material 6 can preferably be selected from the group of granules, in particular pumice granules and / or lava granules.

[0084] As will be further Fig. 2 The retention unit 4 is modular and forms a retention module, namely an exchangeable and self-contained functional unit in the retention network consisting of a plurality of retention units 4.

[0085] It is not shown that the retention units 4 of a retention network are connected to one another in a flow-conducting manner via a pipe network in order to distribute rainwater 5 as evenly as possible in the retention units 4 of the retention network and to store it at least temporarily.

[0086] As will be further Fig. 1 Each row of interconnected and vertically stacked retention units 4 is assigned a regulating unit 8. The regulating unit 8 is designed and provided for regulating the feed of rainwater 5 into at least one retention unit 4, in which Fig. 1 In the embodiment shown, each of the regulating units 8 is fed into the uppermost retention unit 4 of a retention row. For this purpose, the regulating unit 8 has a supply line 9, which is connected in a flow-conducting manner to a roof drainage system 10 of the building 3. This makes it possible to first feed rainwater 5 from the roof surface 2 of the building 3 via the roof drainage system 10 to the regulating unit 8 and then, via the regulating unit 8, into the uppermost retention unit 4 of the retention row.

[0087] By connecting the regulating unit 8 to the roof drainage system 10, it is ensured that preferably all of the precipitation water that reaches the roof surface 2 during a (heavy) rainfall event can be evenly supplied and fed to the retention units 4 via the regulating units 8 in order to ensure optimal absorption and distribution of the precipitation water 8 in or onto the retention units 4.

[0088] The regulation units 8 are designed as modular units that can be decoupled from the retention units 4.

[0089] As in Fig. 2 As shown, the regulating unit 8 has a water reservoir 11 formed by an upwardly open water container with a container bottom 12. However, a closed-top design of the water reservoir 11 is also possible.

[0090] The water reservoir 11 is connected via the supply line 9 during a filling phase (schematically shown in Fig. 3 shown by the arrow 13) with rainwater 5 from the roof drainage system 10. The water reservoir 11 can be drained via a drain line 14 during a draining phase (see arrow 15 in Fig. 3 ). During the emptying phase, the rainwater 5 from the water reservoir 12 is fed to at least one retention unit 4 for temporary storage.

[0091] The emptying of the water reservoir 11 with the regulating unit 8 is carried out according to the siphoning principle. Fig. 3 shows schematically the filling of the water reservoir 11 and its subsequent emptying using the siphoning principle.

[0092] The accumulating rainwater 5 is first collected via the supply line 9 in the water reservoir 11. The container forming the water reservoir 11 is designed according to the functional principle of the Pythagorean cup. The container has an outlet in the container base 12, in which a siphon pipe 16 is installed. The siphon pipe 16 forms a siphon for emptying the water reservoir 11. The siphon pipe 16 has a suction line 17 and an outlet line 19 connected to the suction line 17 via a pipe bend 18, which is connected to the discharge line 14 of the regulating unit 8 or merges into it. This is shown in Fig. 4 shown.

[0093] The suction line 17 has an opening at its free end adjacent to the tank bottom 12, forming a siphon inlet 21. The suction line 17 extends upwards in the water reservoir 11 from the siphon inlet 21 and, at a certain distance from the tank bottom 12, merges into the pipe bend 18, to which the outlet line 19 is connected. The outlet line 19 extends downwards inside the water reservoir 11, preferably parallel to the suction line 17, from the pipe bend 18 and is led outward through the tank bottom 12 of the water reservoir 11 and / or connected to the discharge line 14 in the region of the tank bottom 12. A siphon outlet 22 is formed by the outlet opening of the discharge line 14 outside the water reservoir 11.

[0094] To empty the water reservoir 11, the water level must first rise when filling the water reservoir 11, which leads to a simultaneous rise in the water column in the suction line 17 according to the principle of communicating pipes. When the water column in the suction line 17 reaches the height of the pipe bend 18, the rainwater 5 overflows into the outlet line 19 and subsequently drains the water reservoir 11 automatically via the suction line 17 and the outlet line 19, as well as the discharge line 14, until the water level in the water reservoir 11 drops to the level of the siphon inlet 21. At this point, the water column breaks off, and the draining process automatically stops.

[0095] During the filling phase (see arrow 13 in Fig. 3 ) of the water reservoir 11, the filling level rises (see arrow 20 in Fig. 3 ) in the suction line 19 increases continuously until a certain overflow level h is reached at the lower inner edge of the pipe bend 18, in which the rainwater 5 overflows into the outlet pipe 19. Then the emptying phase begins (see arrow 15 in Fig. 3 ). However, the siphon only starts fully when the water supply to the water reservoir 11 reaches a certain volume flow value and the fill level in the water reservoir 11 has reached the upper inner edge of the pipe bend 18 due to further supply of rainwater 5 and the pipe bend 18 is completely filled with water. The rainwater 5 is then pressed through the suction pipe 17 under the influence of gravity and a suction is created as it flows downwards. This suction sucks the rainwater 5 out of the water reservoir 11 via the siphon opening 21 until the fill level in the water reservoir 11 has sunk to the level of the siphon opening 21 and the suction effect stops. The siphon sucks the rainwater 5 out of the water reservoir 11 in pulses and evenly.

[0096] The interpretation of the Fig. 4 The system shown was carried out as an example for a roof area of ​​15 m 2< . Assuming a heavy rainfall event of 40 l / (m 2< *h), this results in a volume flow of 600 l / h. The total volume of the water reservoir 11 is approximately 31.5 l. The siphon operates in a volume flow range related to the water supply of 170 l / h to 1,320 l / h. Below a water supply of 170 l / h, the siphon does not start fully, and above a water supply of 1,320 l / h, the performance of the siphon is no longer sufficient to discharge the volume flow entering the water reservoir 11 without the water reservoir 11 filling further. The emptying of the water reservoir 11 starts at a filling level of approximately 255 ml. The net volume, ie after the start of the siphon, the water supply is stopped and the volume determined that the siphon leads out of the water reservoir 11, is 22 l ± 0.25 l. The net emptying time, ieThe emptying time that the siphon realizes after starting, if no further water is introduced into the water reservoir 11, is 60 s ± 5 s. From the net volume and the net emptying time, the net performance range of the siphon is calculated, taking into account the above-mentioned error ranges of 1,205 to 1,457 l / h.

[0097] Rainwater 5 is fed into the retention unit 4 from above, in particular in droplets and / or with a constant volume flow, onto the bed of water-storing material 6 of the retention unit 4. For this purpose, the regulating unit 8 is connected to a water distribution device 23, which in the embodiment shown is formed by a pipe system with a plurality of distribution pipes 24, which are fed at the top via a central inlet connected to the discharge line 14 and which can have outlet holes on their underside for optimal, fast, efficient, and uniform water distribution of the rainwater 5 upon feeding into the retention unit 4. The design of the outlet holes (number, placement, shape, or the like) can be targeted to promote particularly uniform water distribution.

[0098] The control unit 8 enables uniform emptying of the water reservoir 11 according to the siphoning principle, energy-independent, in particular, without the need for motor drive power for pumps and without mechanically moving elements / components. The emptying of the water reservoir 11 occurs in pulses when a certain fill level is reached. This avoids peak loads in the water supply of rainwater 5 to the retention unit 4.

[0099] It is understood that a plurality of siphon pipes 16 may also be provided, which may have the same dimension or different dimensions, wherein siphon openings 21 of the siphon pipes 16 may be arranged at the same or different heights in the water reservoir 11.

[0100] As in Fig. 4 As shown, a drip drain 25 can be provided in the container bottom 12 for emptying a residual amount of the rainwater 8 that is not captured by the siphoning system during emptying.

[0101] In order to protect the water reservoir 11 from uncontrolled overflow, a separate overflow pipe 26 can be provided, which can be hydrostatically connected to a water discharge of a rainwater downpipe.

[0102] Fig. 5 shows an alternative embodiment of a siphon of a control unit 8 with a water level pipe as the siphon pipe 16, which extends through the container base 12. A bell 27 is placed over the siphon pipe 16. Emptying via the siphon pipe 16 begins when the water in the bell 27 rises as the water reservoir 11 is filled and an opening in the siphon pipe 16 below the bell 27 is reached, allowing water to overflow into the siphon pipe 16. When the fill level of the water reservoir 11 reaches the bell lid, the siphon reaches its maximum emptying capacity.

[0103] The Fign. 6 bis 9 show schematically embodiments of a regulating unit 8 with a stop mechanism for safely interrupting the suction via a suction lifter of the regulating unit 8, wherein the suction lifter is in the Fig. 6 and 7 shown embodiment by a siphon tube 16 and in the case of the Fig. 8 and 9 In the embodiment shown, it is formed by two siphon pipes 16, 29. The stop mechanism leads to an improvement in the stop behavior or to the reliable interruption of the suction of rainwater 5 from the water reservoir 11 via the siphon, particularly when the inlet volume flow and the siphon volume flow are close to one another.

[0104] Identical and / or functionally equivalent components of the Fign. 4 and 6 bis 9 The control units 8 shown are marked with the same reference numerals.

[0105] According to Fig. 6 and Fig. 7 The stop mechanism is formed by a cup 28 as a stop element.

[0106] When the water reservoir 11 is filled, the cup 28 is flooded and can then stand on the container bottom 12. Fig. 6 shows the regulating unit 8 at the beginning of an emptying phase of the water reservoir 11, whereby the water level can drop depending on the inflow via the supply line due to the suction via the siphon 16 during the emptying phase.

[0107] If the water level in the water reservoir 11 drops below the upper edge 36 of the cup during the emptying phase, rainwater 5 can no longer flow laterally over the upper edge 36 of the cup into the cup 28. The contents of the cup 28 are then sucked out via the suction line 17, and the water level in the cup 28 drops until the suction via the suction line 17 of the siphon pipe 16 comes to a halt.

[0108] The cup 28 can be made of a material with a higher density than rainwater 5. The cup 28 can, for example, be made of polyvinyl chloride or another polymer material with a higher density than rainwater 5. During emptying of the cup 28, it can then be lifted out of the Fig. 6 shown position into the Fig. 7 shown position until the cup bottom rests against the lower edge of the suction line 17. Due to buoyancy forces, the cup 28 rises upwards and can be essentially sucked empty via the suction line 17.

[0109] A recess can be provided at the lower edge of the suction line 17, preventing the suction line 17 from being blocked by the cup bottom when it hits the suction line 17 from below as it rises in the rainwater 5. Air can be sucked in through the recess 35.

[0110] The distance between the upper edge 36 of the cup and the tank bottom 12 of the water reservoir 11 is greater than the distance between the siphon inlet 21 of the suction line 17 and the tank bottom 12. This defines the position of the cup 28 relative to the suction line 17. In particular, it is ensured that the cup 28 cannot dip laterally beneath the suction line 17. The siphon inlet 21 of the suction line 17 is always located above the cup opening and is at least partially submerged in the cup 28.

[0111] The Fign. 8 and 9show an alternative embodiment of a suction lifter of a regulating unit 8, wherein the suction lifter is formed by a first suction lifter pipe 16 with a suction line 17, which has an opening at the free end adjacent to the container bottom 12, which forms a siphon inlet 21.

[0112] A second siphon pipe 29 is connected to the first siphon pipe 16, which has a suction line 30 with a smaller diameter than the suction line 17 of the first siphon pipe 16. Furthermore, an opening at the free end of the suction line 30, which forms a further siphon inlet 31, is spaced further from the container bottom 12 of the water reservoir 11 than the opening at the free end of the suction line 17 or the siphon inlet of the first siphon pipe 16.

[0113] The conductor bend 18 is used in the Fig. 7 The embodiment shown is formed, for example, by a pipe bend 32 and a pipe connector 33, to which a pipe bend 34 of the further suction pipe 29 is connected. The further pipe bend 34 is connected to the suction line 30 of the further suction pipe 29.

[0114] When filling the water reservoir 11, the water level in the suction lines 17, 30 rises evenly. When the water level in the suction lines 17, 30 reaches the overflow height of the respective siphon pipe 16, 29 into the common outlet line 19, the automatic emptying of the water reservoir 11 begins via both suction lines 17, 30. The overflow height of the siphon pipes 16, 29 into the outlet line 19 can be at the same water level or at different water levels.

[0115] Here, too, a cup 28 is provided as a stop element of a stop mechanism. The cup 28 has a greater density than the liquid in the water reservoir 11 or the precipitation water 5. Due to the greater density, the cup 28 is in accordance with Fig. 8 When the cup 28 is flooded with water, it rests on the container bottom 12 until the water level in the water reservoir 11 drops below the upper edge 36 of the cup when the water reservoir 11 is emptied. The cup 28 is then emptied via the suction line 30 of the further suction siphon pipe 29 and the water level in the cup 28 drops compared to the water level of the rainwater 5 in the water reservoir 11. When the water level in the cup 28 drops, the buoyancy force increases and the cup 28 begins to rise in the rainwater 5 until the cup bottom comes to rest against the siphon inlet 31 of the suction line 30 ( Fig. 9 ).

[0116] Air is then sucked in through the recess 35 at the lower edge of the suction line 30. The suction of air through the suction line 30 subsequently leads to an interruption of the suction through the suction line 17 of the first siphon pipe 16.

[0117] A recess 35 at the lower edge of the suction line 30 ensures that an airtight contact of the cup bottom against the lower edge of the suction line 30 cannot occur when the cup 28 rises in the rainwater 5. Such an airtight contact of the cup bottom against the suction line 30 could result in a water column remaining in the suction line 30, thereby preventing the interruption of the suction via the main line 17.

[0118] The upper edge of the cup 36 is when the cup 28 rests on the container bottom 12 of the water reservoir 11 ( Fig. 8 ), sufficiently far above the siphon inlet 21 of the (first) suction line 17. This ensures that the water level is always above the lower edge of the suction line 17 during the emptying of the water reservoir 11 and thus the siphon inlet 21 of the suction line 17 is always in the water. When the water reservoir 11 is emptied and the water level in the water reservoir 11 is lowered to a sufficiently low fill level, air is then sucked in via the suction line 30 of the further siphon pipe 29, which leads to a reliable interruption of the suction via the suction line 17 of the (first) siphon pipe 16. Bezugszeichenliste:

[0119] 1Building layout 2Roof area 3Building 4Retention unit 5Rainwater 6Material 7Corpus 8Regulation unit 9Supply line 10Roof drainage 11Water reservoir 12Tank base 13Arrow 14Drainage 15Arrow 16Syphon pipe 17Suction line 18Bend 19Outlet line 20Arrow 21Syphon inlet 22Syphon outlet 23Water distribution device 24Distribution pipe 25Drip drain 26Overflow pipe 27Bell 28Cup 29Syphon pipe 30Suction line 31Syphon inlet 32Pipe bend 33Pipe connector 34Pipe bend 35Recess 36Cup top edge

Claims

1. Building arrangement (1) with at least one building (3) having a roof and / or facade area (2), with at least one retention unit (4) having a water-storing material (6) for at least temporarily storing rainwater (5) from the roof and / or facade area in the water-storing material (5) and with at least one regulating unit (8) for regulating the feed of rainwater (5) into the retention unit (4), characterized in thatthe regulating unit (8) has a water reservoir (11), at least one supply line (9) for filling the water reservoir (11) during a filling phase with rainwater (5) from the roof and / or facade surface (2), and at least one discharge line (14) for emptying the water reservoir (11) during an emptying phase, wherein rainwater (5) drained from the water reservoir (11) during the emptying phase can be fed to the retention unit (4) for temporary storage in the water-storing material (6), wherein the regulating unit (8) for emptying the water reservoir (11) is designed according to the siphon principle, and wherein a stop mechanism with at least one stop element is provided at the siphon inlet (21, 31) of a siphon pipe (16, 29) for safely interrupting the suction via the siphon pipe (16, 29).

2. Building arrangement (1) according to claim 1, characterized in thatthe stop element is a buoyancy body, whereby a change in position of the stop element is caused by buoyancy forces.

3. Building arrangement (1) according to claim 1 or 2, characterized in that the suction of ambient air via the stopper element into the siphoning pipe (16, 29) results in an interruption of the emptying of the water reservoir (11) via the siphoning pipe (16, 29).

4. Building arrangement (1) according to one of the preceding claims, characterized in that the stop mechanism has a cup (28) as a stop element which is closed at the bottom and sides and open at the top.

5. Building arrangement (1) according to one of the preceding claims, characterized in that the cup (28) is arranged in regions below the siphoning pipe (16, 29), wherein the siphoning inlet (21, 31) of the siphoning pipe (16, 29) dips into the cup (28) from above.

6. Building arrangement (1) according to one of the preceding claims, characterized in thatthe density of the cup material of the cup (28) is greater than the density of rainwater, in particular wherein the density is between 1.2 and 1.6 g / cm3, further in particular between 1.35 and 1.5 g / cm3.

7. Building arrangement (1) according to one of the preceding claims, characterized in that the cup (28) is made of a plastic material, for example polyvinyl chloride.

8. Building arrangement (1) according to one of the preceding claims, characterized in that the regulating unit (8) has a siphon with at least two siphon pipes (16, 29) which have a different distance from the container bottom (12) of the water reservoir (11), wherein the siphon pipes (16, 29) open into a common outlet line (19) of the siphon and wherein a stop mechanism with a cup (28) as a stopper element is formed at the siphon inlet (31) of the second siphon pipe (29).

9. Building arrangement (1) according to claim 8, characterized in thatthe siphon inlet (31) of the second siphon pipe (29) has a greater distance from the container bottom (12) of the water reservoir (11) than the siphon inlet (21) of the first siphon pipe (16).

10. Building arrangement (1) according to claim 8 or 9, characterized in that the first siphon pipe (16) has a larger pipe diameter than the second siphon pipe (29).

11. Building arrangement (1) according to one of the preceding claims, characterized in that a recess (35) is provided at the lower edge of a suction line (17, 30) so that an airtight contact of the cup base of the cup (28) against the lower edge of the suction line (17, 30) cannot occur when the cup (28) rises in rainwater.

12. Building arrangement (1) according to one of the preceding claims, characterized in thatthe upper edge (36) of the cup (28) is above the siphon inlet (21, 31) of a suction line (17, 30) of the siphon pipe (16, 29) when the cup (28) rests on the container bottom (12) of the water reservoir (11).

13. Regulating unit (8) for use in a building arrangement (1) with at least one building (3), in particular for use in a building arrangement (1) according to one of the preceding claims, with a water reservoir (11) connected to a roof and / or facade drainage system (10) of the building (3), with at least one supply line (9) for filling the water reservoir (11) during a filling phase with rainwater (5) from the roof and / or facade drainage system (10) of the building (3) and with at least one discharge line (14) for emptying the water reservoir (11) during an emptying phase, wherein a siphon with at least one siphon pipe (16, 29) is provided and / or designed for emptying the water reservoir (11), and wherein a stop mechanism with at least one stop element at the siphon inlet (21, 31) of the siphon pipe (16, 29) is provided for safe interruption of the suction via the siphon pipe (16, 29) is provided.

14. Regulating unit (8) according to claim 13, characterized in that the siphon is designed for a volume flow of rainwater (5) supplied to the water reservoir (11) based on the area in [m2] of a rain collection area connected or connectable to the regulating unit (8), in particular a roof and / or facade area of ​​a building (3), between 5 l / (h*m2) and 250 l / (h*m2), preferably between 10 l / (h*m2) and 100 l / (h*m2).

15. Arrangement with at least one regulating unit (8) according to one of the preceding claims and with at least one retention unit (4), wherein the retention unit (4) has a water-storing material (6) for at least temporarily storing rainwater (5), in particular wherein the retention unit (4) is designed as a modular bulk material cassette and has a bed of the water-storing material (6), in particular wherein a bed is selected from the group of granules, more particularly pumice or lava granules, and wherein the arrangement is designed to feed rainwater (5) from the regulating unit (8) into the retention unit (4).

Images