Classifications

• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03F—SEWERS; CESSPOOLS
  • E03F5/00—Sewerage structures
  • E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
  • E03F5/101—Dedicated additional structures, interposed or parallel to the sewer system
• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03F—SEWERS; CESSPOOLS
  • E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03F—SEWERS; CESSPOOLS
  • E03F5/00—Sewerage structures
  • E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
  • E03F5/105—Accessories, e.g. flow regulators or cleaning devices
  • E03F5/107—Active flow control devices, i.e. moving during flow regulation
• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03F—SEWERS; CESSPOOLS
  • E03F2201/00—Details, devices or methods not otherwise provided for
  • E03F2201/10—Dividing the first rain flush out of the stormwater flow

Definitions

• the invention relates to a device for collecting, temporarily storing and draining off rainwater, comprising a temporary storage tank, which is provided with at least one infeed, a first outlet arranged close to the bottom of the tank and a second outlet arranged at a distance above the bottom of the tank.
• a device of this kind is known from German Patent No. 2506126.
• rainwater which comes from a feed line which is connected to the infeed, is collected in the tank.
• the first outlet which compared to the infeed has a small diameter, under normal circumstances drains off rainwater to a sewer line and a sewage-water purification system situated downstream thereof.
• the amount of rainwater fed in is such that the outlet has insufficient capacity, so that the tank is filled up.
• the surplus water is then drained off via the second outlet to, for example, the surface water. In this way, the capacity of a sewer line and of a sewage- water purification system downstream thereof may be limited.
• Rainwater in particular if it comes from roofs, roads or car parks, is not always sufficiently clean to be discharged directly into the surface water or to be reused.
• the dirt is drained off with the first flow of rainwater, and the following flow is in fact sufficiently clean. If the first quantity of rainwater is now guided via the first outlet to the sewage-water purification system, the following flow can be used for other purposes, such as reinfiltration into the ground in order to prevent an undesired fall in the groundwater table, reuse for various domestic applications, or, if necessary, discharge into the surface water.
• the known device is provided with a movable device which prevents floating dirt from passing into the second outlet together with the water.
• a device of this kind requires regular maintenance, since if it functions incorrectly floating dirt will be drained off as well.
• the first outlet is provided with an adjustable valve or slide in order to be able to adjust the quantity of water which is drained off through the first outlet.
• the object of the invention is to provide an improved device which is less susceptible to failure and by means of which the amount of rainwater which can be employed usefully can be increased. According to the invention, this object is achieved in a device of the type mentioned at the outset in that the first outlet is provided with a self-adjusting flow limiter which leaves the first outlet open in the event of low flow rates in the first outlet and, in the event of increasing flow rates, closes the first outlet.
• Fig. 1 very diagrammatically shows a device according to the invention
• Fig. 2 is a vertical section of a practical embodiment of a device according to the invention, in the form of a manhole
• Fig. 3 is a vertical section of the manhole of. Fig. 2 along the line III-III,
• Fig. 4 is a top view of part of the manhole of Fig. 2, and Fig. 5 shows the first outlet of the manhole of
• Fig. 1 very diagrammatically shows a device for collecting, temporarily storing and draining off rainwater.
• the device comprises a temporary storage tank 2, which is provided with an infeed 4, a first outlet 8 arranged close to the bottom 6 of the tank and a second outlet 10 arranged at a distance above the bottom 6.
• the first outlet 8 is provided with a self- adjusting flow limiter 20 which leaves the first outlet 8 open in the event of low flow rates and, in the event of increasing flow rates, closes the first outlet 8.
• the first outlet 8 is formed by a pipe bend 14, which is arranged in the side wall 12 of the tank 2 and the end part 16 of which, situated inside the tank 2, faces towards the bottom 6 of the tank, so that the outlet 8 has an inflow opening 18 which faces towards the bottom 6 of the tank 2.
• the flow limiter 20 is arranged on the underside of the end part 16 facing towards the bottom 6 and is formed by a valve which is controlled by the flow rate into the first outlet 8.
• This valve comprises a valve body in the form of a ball 24 which can move freely in a housing 22 arranged around the inflow opening 18.
• An inflow opening 26 is arranged on the underside of the housing 22.
• the relative density of the ball is slightly greater than the relative density of water and is, for example, equal to 1.2. A higher relative density is also possible, but in that case the space between the ball 24 and the housing 22 has to become smaller, increasing the risk of blockage.
• a permanent passage 28 with a low through-flow capacity is present between the interior of the tank 2 and the first outlet 8.
• the second outlet 10 is formed by a pipe bend 30 which is arranged in the side wall 12 of the tank 2 and the end part 32 of which, situated inside the tank, faces towards the bottom 6 of the tank 2, so that the outlet 10 has an inflow opening 34 which faces towards the bottom 6 of the tank 2.
• the infeed 4 is arranged opposite and at substantially the same height as the second outlet 10, in the side wall 12 of the tank 2.
• the ball 24 In the event of light rainfall, when the flow rate through the housing 22 and the first outlet 8 is low, the ball 24 floats, as it were, in the rainwater flowing from the inflow opening 26 and towards the inflow opening 18 and the inflow opening 18 is not closed off. In the event of heavier rainfall, when greater flow rates occur in the housing 22, the ball 24 is carried along by the water flowing from the inflow opening 26 towards the inflow opening 18 and is pressed onto the opening 18, so that this opening is closed off by the ball 24. From that moment, the tank 2 fills up further and the ball 24 is pressed ever more against the inflow opening 18 by the static pressure. When the water level in the tank has reached the level of the second outlet 10, the rainwater, which is then relatively clean, is drained off via the second outlet 10. This rainwater can be reused or can be discharged into the surface water.
• the ball 24 does not function correctly and does not close off the first outlet 8 correctly, the only effect is that the quantity of water which is incorrectly guided via the first outlet 8 to a sewage line is greater than intended, but dirty rainwater is not drained off via the second outlet 10.
• a further advantage of the design according to the invention is that the maintenance required is minimal, owing to a small number of components and the simple and operationally reliable design.
• the design of the various components of the device according to the invention may differ from the design depicted in Fig. 1, as long as the intended function is maintained.
• the valve body of the valve serving as the self-adjusting flow limiter may have a different form.
• the second outlet may also be designed differently.
• the infeed may be arranged at a different location in the side wall or on the top of the tank.
• Figs. 2 to 4 show a more practical embodiment of the device according to the invention, in the form of a manhole.
• components which correspond to components from the device depicted in Fig. 1 are indicated with the same reference numerals.
• the second outlet 10 is at right angles to the infeed 4 and the first outlet 8.
• the bottom 6 of the manhole is V-shaped and is formed by a separate manhole bottom part 40.
• a manhole - - shaft 42 which forms the side wall of the manhole.
• -A sealing ring 44 is arranged on the top of the manhole shaft 42, for the purpose of sealing with respect to a manhole cover part which is not shown here.
• the device according to the invention may also be designed as a street or pavement gully hole (not shown) . In that case, the infeed will usually not be arranged in the side wall of the tank, as in the embodiment depicted in Figs. 1-4, but rather on the top of the tank. Possible advantages of a design as a gully hole are that no, or fewer, manholes are required in the sewage system, the system is less susceptible to faults, and, unlike in the case of a manhole, regular inspections take place.
• the housing 22 may be provided with one or more tubes 46 which are easy to install and remove. In this way, the cut-out flow rate can easily be altered.
• the housing 22 is equipped as standard with one tube 46. This design is then suitable for a manhole to which 1 to 5 inlets are connected. If it is necessary to connect more inlets, for example 6 to 10, to the manhole, then the tube 46 can be removed after unscrewing a screw cover 48.
• the removable cover 48 is also advantageous in the event of any maintenance .

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• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Hydrology & Water Resources (AREA)
• Public Health (AREA)
• Water Supply & Treatment (AREA)
• Sewage (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=19763812

Family Applications (1)

Country Status (4)

Families Citing this family (15)

Family Cites Families (4)

• 1996
  • 1996-11-06 NL NL1004453A patent/NL1004453C2/nl not_active IP Right Cessation
• 1997
  • 1997-11-04 AU AU49691/97A patent/AU4969197A/en not_active Abandoned
  • 1997-11-04 EP EP97912558A patent/EP0948682A1/de not_active Withdrawn
  • 1997-11-04 WO PCT/NL1997/000605 patent/WO1998020209A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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