Field of the invention

The present invention relates to basins or tanks for the management of water and possible other enclosed liquid or solid material. Specifically, the invention relates to a basin that is particularly advantageous with respect to the environment. Background of the invention and prior art

When areas are developed, large roofs, paved areas and similar areas are typically formed, which areas quickly collect volumes of water from the rain. These water volumes must be taken away in a pipe system. The piping systems comprises gutters from houses, sinks collecting water from paved surfaces and any flows that collect drainage from rainwater. Common to all the water collected is that it ends up in the pipes that lead water away from the area, to rivers, streams and to the sea. For some areas, it is a requirement that this water should be cleaned before entered into a recipient.

As more and more new areas are being developed a large quantity of rainwater must be carried out from an area. This means building of pipelines with large dimensions in order to divert water. Pipelines with large dimensions entail large costs.

For areas where pipelines are built back in time, these are not designed to handle rainwater from new buildings and paved surfaces. This may at worst lead to not having the opportunity to develop new areas until new and costly pipelines are built. This may mean that areas are not profitable to develop. For other areas it can be seen that the pipeline network is overloaded and water may come out of sinks rather than flow into sinks at heavy rainfall.

Current measures to limit the overloading of transfer or overflow pipelines is the use of retention magazines (Prior art -1 and -2), and to a less extent infiltration (Prior art -5).

In cases with requirement to cleaning before discharging to a recipient, there must be solutions that limit water supply rate during periods of heavy rainfall and snow melting, to avoid large amounts of unpuhfied water that goes into the recipient.

The currently known devices are as follows, with reference to the attached figures (Prior art 1 -5):

Prior art -1 : Current retention magazine (See Fig: Prior art nown-1 ) can be built by having a tube of very large diameter or a tank that holds water. Into tha magazine/ tank is a pipe with large diameter such as 500mm. Out of the magazine / tank is a smaller pipe such as 200mm diameter. The magazine / tank will thus slow the water so that a reduced water flow rate are flowing further into the pipeline systems.

Prior art -2: Current retention magazine is based on building a retention magazine / tank next to the pipeline. When the pipeline is too small in capacity, the pressure in the pipeline increases (as it does when the water comes up out of drains in the road). The water will then be pressed into the magazine / tank next to the pipeline. As the rain and the pressure in the main pipe decrease, the water can flow back to the main pipe and is carried away. In this way, one can relieve the main pipeline when the water supply is at largest.

Prior art -3: Is based on a sand trap drain for collecting water. This solution is a sink that is shaped like a vertical cylinder. In the top of the cylinder is a gratin that water flows down through, for example from a paved road. The water often entrains sand and more, which is collected in the bottom of the tank.

Furthermore, there is a tube that goes through the tank wall to a transfer pipeline. This tube is placed a piece up on the wall, so there's room for a certain amount of sediment in the bottom of the tank before it reaches the outgoing pipe. (When the precipitate reaches the outgoing pipe, the precipitate is sucked up and removed from the tank using a suction vehicle). The outgoing pipe has a bend down (lock) so that items that float up on top of the water are not supplied to the transmission pipeline.

Prior art -4: Is based on a solution that is marketed and sold by Basal. The solution is a standard sink / sand traps as described in the Prior art -3, but with an extra room under the cover for water to be infiltrated into the ground around it. The solution has also a tube from the sand trap to the room under the sand trap. The water that flows into the surrounding ground, will drain into the transmission pipelines.

Prior art -5: Is based on known technology Prior art -3, but small holes are drilled in the side of the tank so that water will drain into the surrounding masses. The problem is that when ground water rises, water flows into the drain and load transfer pipelines with additional inflow of water. Because of the weakness of this solution it is used to a limited extent.

Some of the experienced weaknesses or deficiencies with the known equipment is as follows: Prior art -1 : The solution is functional and solves a problem. The solution is used in increasing extent. Weakness of the solution is that a) it is a massive construction and is therefore costly to build, b) The solution does not utilize infiltration to the surrounding masses.

Prior art -2: saddled with the same weaknesses as Prior art -1.

Prior art -3: This solution brings all the water out to the transmission pipeline without retention or infiltration to the surrounding masses. The volume in the drain / sand trap is limited so that the effect of retention is so small that this is normally not considered as retention.

Prior art -4: The solution can not be used in situations with high groundwater level. In such cases, the ground water in the ground will drain into the manhole and into the transmission pipelines, so the solution seems counterproductive. In some cases it is difficult to know the level of ground water during periods of prolonged heavy rainfall. The solution therefore has a very limited application.

(This solution has a frost / ice overflow in case of an ice accumulation in underlying volume for water infiltration.)

Prior art -5: Groundwater flows freely in and is carried away through the transfer line.

The invention aims to avoid or to avert the aforementioned weaknesses or deficiencies. Summary of the invention

The purpose is achieved by the invention providing a basin (i.e. yard manhole, well, sink or tank) suitable for infiltration and/or retention, comprising a volume formed by a basin body, a container, a pipe or a pipe section, and at least one inlet for water or other liquid to the volume, distinctive in that the basin further comprises an infiltration bore arranged separately, embedded or fluidly connected to the inlet or an outlet, the infiltration bore is open for outflow from the basin if the surrounding water level is lower than the infiltration bore or another specific level, and closed or restricted for flow in at least one of the flow directions in and out if the surrounding water level is higher than the infiltration bore or the specific level.

The basin can be a traditional sink or manhole with a drain or grate, a modified retention tank, a part or an extension of a pipeline or any general tank or container equipped with an infiltration bore. With an infiltration bore it is meant a bore for water or any other liquid, with a facility, that is, a valve, one-way valve, water lock or similar, having function to close the opening for water flow out of the basin, in whole or in part, when the surrounding water level, the ground water level, is higher than a certain level, and to keep the bore open for flow when the surrounding water level is below a certain level. The valve device can be added outside the actual bore, for example in an attached tube, so that these levels may be different than the level of the actual bore in the wall. With the bore it is meant the actual bore or opening in the wall and any associated pipes that lead water into and out, and said valve device which controls the

functionality can be arranged in the actual bore, the pipe or basin or tank. The inlet means also includes overflow from the surface, through a lid, grid or cover or directly, leakage water coming into the basin or water flowing in through other openings. The basin or tank tank acts as a reservoir that collects water in the tank volume but emit only water under certain conditions, at specific rate, to infiltration, into the pipeline network or to another location or purpose. Any existing manhole and many existing containers can be modified into a basin according to the invention by arranging an infiltration bore. The infiltration bore can be completely open when the surrounding ground water is below a certain level and completely closed when the surrounding ground water is over said level. Embodiments where the closure is only partial, that is limited, are also included, for example, with slow outflow by closing the bore only partially. The design of the valve device of the infiltration bore can be so that the flow rate is different in and out. The inlet can be identical to an outlet, such as connection to an overflow network, for example, so that infiltration can take place when there is capacity. The basin according to the invention can also be used in tidal zones and in places where there are frequent floods, whereby the tank will always be empty and available to personnel when the water level is low. The infiltration bore includes preferably a one-way valve that is open to flow out of the tank and closed for flow into the tank. The one-way valve includes conveniently a buoyant object such as a light ball, a flap or a bellows, mounted in a bore so that at high surrounding groundwater level the buoyancy object or body floats up in a displacement volume to a sealing position against a seat, so that the opening for flow is closed. The infiltration bore include conveniently a one-return valve with a moveable buoyancy element that can float up to a seat, thus closing a flow path through the infiltration bore. The infiltration bore preferably include one buoyancy element mounted on an articulating arm so that a sealing element, which may be the buoyancy element or another element, can be tilted against a seat, thus closing a flow path through the infiltration bore when the buoyancy element is lifted by the buoyancy.

Preferably the infiltration bore and an outlet have a lowered, angled inlet, so that items that float on the surface is prevented from flowing into the pipeline networks or infiltration volumes. The basin preferably comprises covers or grid in the upper part, preferably in the top, so that surface water can drain into the basin, and a sedimentation volume in the bottom and any optionally further inlets. The outlet is connected to a overflow network, a transfer network or other networks or other devices for receiving water, while the infiltration bore leads to an infiltration volume at or near the sink.

Figures

Figures Prior art -1 to Prior art 5 illustrate the known technique,

Figures T1 to T8 illustrate a basin or details of a basin according to the present invention,

Figures T-10 T-15 are sections illustrating a basin according to the invention, and

Figures T -21 to T-26 are sections illustrating some of the many possible embodiments of infiltration bores of a basin according to the invention. Detailed description

A basin according to the invention may have similarities with a basin according to prior art -3 which includes a vertical cylinder with a bottom and a top in the form of a lid or grate where water can drain down the basin. The basin can, like prior art -3 have a lowered outlet into a pipeline that takes water away from the drain. But in addition, there is an infiltration bore with a one-way valve, sometimes a little misleading called a water lock. This means that the water in the basin flows out infiltrating the masses as far as possible. When ground water is rising in the surrounding masses, the valve is closed so that water can not flow. That way, water is drained and collected in the basin and infiltrated in the surrounding masses, whenever possible, and led through the pipeline to a transmission pipeline when the surrounding ground water is high and the valve or water lock is locked. In this way water is returned to the ground in those areas where it was originally infiltrated before paved surfaces, roofs, etc. were developed. Along a pipe stretch with multiple drains the level of ground water varies for each manhole, affected by precipitation, annual variations, etc.. It will mean that over time it changes which basin in an area will face high or low ground water level. This variation results in that it varies over time, which basins infiltrate water into the surrounding masses.

A trench can be used as a retention magazine. The pipes in a trench stretch is often surrounded with gravel and a geo-membrane which separates gravel from the surrounding masses. At heavy rains, water is forced into the drain and into the retention infiltration basin. Along pipe stretches it will be appropriate to limit the extension of a retention magazine by blocking with dense masses, such as clay, before and after the stretch of the transmission pipeline constituting a retention / infiltration basin of the invention. The invention allows water to infiltrate into the surrounding masses, even if one has no control on the level of groundwater. The basin will infiltrate water to the surrounding areas until the ground water rises. When the groundwater rises and close the water trap or the valve no water can not flow into the basin and on to the transmission pipelines from the surrounding masses. Surrounding masses can be used as retention magazines, instead of building extensive tanks of for example concrete (ref. the prior art solutions -1 and-2). Reduced flood peaks and generally raised ground water levels are other beneficial effects of the invention. The level of groundwater in an area varies over the season, rain, frost in the ground, and more. When one does not know the level of groundwater, the "prior art -4" can not be used as such a solution will fed transmission pipelines with uncontrolled amounts of groundwater. With the basin according to the invention, advantage can be provided by using all the places that are

appropriate for infiltration, using local infiltration of water. Next time there may be other pipe stretches that are favorable for infiltration and thus relieves the transmission pipelines with infiltration of water. Drains, pipes, transmission pipelines, etc.. is normally surrounded by gravel. Gravel is suitable as retention and / or infiltration magazine. The basin according to the invention can bring water out to the gravel along the pipes and use this as infiltration magazine. One can also connect a pipe to an outlet-2 that extends along the pipes which are surrounded by the gravel. In this way an effective retention magazine is provided to a very low cost. In this way a pipeline route acts as a retention and infiltration or magazine where groundwater is sufficiently low, the remaining stretch closes the valve and function as a normal pipeline stretch without retention.

The basin allows building retention magazines along large parts of, or along the whole of pipeline routes. Basins according to the invention, without drain or grating, can also be installed along the transmission pipelines, using

surrounding volumes as retention magazines. In these cases, only the retention -infiltration-functionality of the basin is used, not the drain or sink function. The basin can be used for infiltration of local masses. This is facilitated by a gravel fill around the basin and separating the gravel single from the local masses with a geo-fabric, or not. Thereby a simple infiltration solution is provided.

Alternatively a pipeline can be connected, extending into the local masses and spread out water along a trench for infiltration.

A more detailed description of the figures is as follows:

Figure T-1 , shows an actual execution of the basin. The basin is essentially circular / cylindrical. 1 ) bottom section and floor of the basin 2) intermediate part with 11 ) lowered drain, 12) water trap, 13) IS-overrun, 3) cone with the reduction of the diameter of the drain. On top of the cone may be 31 ) height adjustment of the drain to adapt it to the terrain elevation with the use of plastic rings, concrete rings, periscope solution, a neck that can be reduced, or the like. Over the cone will be a 32) lid, preferably a drain grating. If the basin is used only for infiltration and not as a gutter or sink, a tight lid or cover can be on top.

The solution 1 ), 2) and 3) can be produced in a unit or they can be produced in several units.

Alternatively, it may be an element 4) as an intermediate ring between 1 ) the bottom and 2) the intermediate part so that an increased height of the basin is achieved and thus increased volume under the intermediate part. One will gain a greater sludge disposal at the bottom of the basin, so that one gets a larger interval between each time one must remove (sludge suction) the sludge. One can also consider adding 4) intermediate ring between 2) middle section and 3) cone to increase the height of the basin to fit the top of the basin to the height of the terrain.

Figure T-2: shows the intermediate section viewed from above. 2) The intermediate part has embedded three functions.

The first is submerged "submerged outlet" (11 ) on the pipe that runs from the drain and out to transmission pipelines. The water trap prevents items that float up on the surface of the water will come inside the drain and into the

transmission pipelines.

The second feature is 12) water trap that provides the ability to drain water from the basin and into the surrounding masses, but where the water trap prevents water to drain in from the surrounding masses and into the basin. This provides the ability to infiltrate water into the surrounding masses. The third function is a 13) IS overflow that may be appropriate to develop as part of the solution. Such a solution built up as part of 12) water-lock, to prevent ice build up in the water trap to push apart the structure. A water trap is formed preferably as a tube that goes up to a level that is higher than the 11 ) submerged outlet, and so high that groundwater does not flow into the drain through this tube. This IS of course can also be formed with a lid that has such great gravity that groundwater can not lift it, while the pressure from ice is lifting the lid. One then has an additional protection so the groundwater does not flow into the drain via the IS overflow.

Figure T-3: shows a section through 2) the intermediate part (2). A possible design of the valve / water trap (12) is shown.

The water trap (12) can be provided with the use of a ball (15) flowing in a pipe (16) and closing against a seal, packer or gasket (14). Water flows out to the environment in slits (17) and or through the outlet (18). At the end outlet (18) can connect to a pipe with slits that distribute such water into the surrounding masses.

Water that is brought in through a lid or grating in the top of the basin will fill up to get a level where the water flows down into the water trap (12) or through the outlet pipe (20). Water that flows into the trap (12) or outlet (20) has preferably flown through a submerged outlet. The construction of a submerged outlet will be that water will drain from the basin down and under a wall (21 ) separating the outlet from the rest of the basin drain. Thereby surface water is hindered from flowing out the outlets. Increasing the height of the wall (21 ) will reduce the amount of sediment entrained into the outlet. On top of the submerged outlet is a lid (19) which seals water from flowing into the tube without flowing through the submerged outlet. The lid (19) acts as an access for inspection and maintenance. The basin can be connected to a high number of tubes (22) coming in from other sources for water. This can be from gutters, other drains, drainage from the house, etc. Frost overrun can be provided with a tube (23) that sticks up above the level of the other outlets and/or with a tube that is provided with a lid (25) and seal (24) to prevent water running down the pipe and out from the pipe, but open to pressure from the ice from the lower side. See description IS-overflow (13) for Figure T-2. Figure T-4:: shows a cut through intermediate part (2), where the drawing is similar to T-3, but with the exception of the bullet (15) in water trap (12) is at a lower level. That drawing shows the water trap in the open position.

Figure T-5: shows a 3D drawing of the intermediate part (2).

Figure T-6: shows a section through the intermediate part (2), where the basin drain is connected to external piping.

The basin is through outlet (20) connected to a drain pipe (41 ) that leads water to transmission pipelines (42). A tube (43) is connected to the outlet (18). The tube (43) distribute the water in an area along the ditch, where the water flows into the gravel (45) which is filled around the pipes. This gravel along with a geo-fabric (46) forms as a reservoir for the water, while this water can be infiltrated in the surrounding masses. The area of the water reservoir can be limited with a clay-stopper (44). The areas around the tubes are filled up with gravel. To replace the gravel with clay in for example 1 m length the water will be prevent from flowing past the clay and further along the transmission pipelines (42).

Figure T-7:: shows the same solution as T-6, except that the pipe (43) is not part of the solution. The water then flows through slots (17) or opening (18) and into the surrounding masses. Figure T-8: shows a section through the intermediate part (2), where two basins are connected in series together and to external piping. Tubes (43) are connected between two basins located along the transmission pipelines (42). One gets in this way a solution with large capacity (to retain water) and / or to infiltrate water. Clay cap (44) can be used to limit the extent of an infiltration solution, and thus prevent water running down the pipeline where it is not desired, for example where one has large drop in a stretch then water running down the stretch may dig in trench sides, this can be prevented with a clay plug. Figures T-10 T-15 are sections illustrating a basin according to the invention, and shows the same or similar features as described above, but a little easier readable. Figure T- 11 shows an embodiment of a basin with an infiltration bore which is at lower level than an outlet to an outlet pipeline, which results in that water only flows into the infiltration bore and only feed the pipelines when the infiltration bore does not take away all water from the basin. This provides a solution that regularly relieves the pipeline network.

Figure T-16 shows an embodiment with a basin with an infiltration bore which is higher than an outlet to an outlet pipeline, which results in a situation where water only flows into the infiltration bore when the outlet does not take away all the water entering the basin. This provides a solution where the infiltration bore only relieves the pipeline when large amounts of water are fed. This provides a solution that relieves the pipe network at heavy rains.

A further embodiment (not shown) in accordance with the present invention includes a basin with an infiltration bore located at the same level as the outlet to an outlet pipeline, which results in a situation where water is distributed to the infiltration bore and outlet, and the one of these outlet flows which is most receptive to replenishment of water, take away the greatest amount of water.

Figures T-21 to T-26 are sections illustrating some of the many possible embodiments of infiltration bores in a basin according to the invention.

Specifically illustrated are various infiltration bores at different groundwater levels.

The basin of the invention can be produced from concrete, steel, plastics, composite materials or any other suitable material, and can include any combination of functional features among those described and illustrated in this document. Any type of one-way valve or float valve / shut-off device can in principle be used as long as the required and prescribed functionality can be achieved without undue difficulty.