CN218540846U - Water replenishing device for outdoor rainwater reservoir - Google Patents

Abstract

The utility model discloses an outdoor rainwater cistern moisturizing device, including cutting off water tank outlet pipe, cutting off water tank, water pipe, solenoid valve, backflow preventer, water gauge and gate valve, set up subaerial gate valve, water gauge, backflow preventer, solenoid valve and water pipe series connection in proper order, set up in subaerial wall water tank and the outdoor cistern of underground through cutting off water tank outlet pipe intercommunication, the delivery port of water pipe set up in cut off the top or the lateral wall of water tank, the delivery port of water pipe is higher than cuts off overflow water level in the water tank, cuts off the level of the water inlet of water tank outlet pipe and is higher than and is located the level of the maintenance manhole at outdoor cistern top, the outlet pipe mouth of cutting off the water tank outlet pipe is higher than the overflow water level of overflow hole on the outdoor cistern. The utility model discloses a moisturizing device can effectively avoid the running water mouth of pipe of moisturizing to be polluted by the rainwater and flood when falling the torrential rain, has still reduced the construction degree of difficulty and the cost of valve well.

Description

Water replenishing device for outdoor rainwater reservoir

Technical Field

The utility model belongs to the technical field of the retrieval and utilization is collected to the rainwater, more specifically relates to an outdoor rainwater cistern moisturizing device.

Background

The national standard of general Specification for Water supply, drainage and conservation (GB 55020-2021) implemented in 2022, 4 and 1 provides that "7.3.3" when domestic drinking water is used for replenishing water to an outdoor rainwater reservoir, a water replenishing pipe opening is not submerged under the condition of rainstorm and water accumulation on the outdoor ground ".

After the engineering land is built, the ground can be hardened, the hardened ground is not easy to permeate water during rainfall, the runoff loss of the most of rainwater on the surface of the hardened ground can be formed, and the rainwater can flow into a municipal rainwater drainage system, so that the total rainwater drainage amount and the peak flow rate in the rainwater system are greatly increased. In engineering, a rainwater collecting and utilizing facility is arranged near the engineering land, and a large amount of rainwater on the hardened ground is absorbed by using the storage volume of the rainwater collecting facility, so that the peak flow of rainwater discharged outside the whole engineering land is reduced. The rainwater recycling system is applied to water supply systems such as miscellaneous use, landscape and the like, so that the concepts of green, water saving and energy saving are embodied. Through this kind of mode both can reduce the outer peak flow who arranges of rainwater, alleviate the pressure of city drainage floods and receive the flood peak load in the rivers way of water, can keep constructing original natural rainwater runoff characteristic in the land again, avoid the rainwater to run off, practice thrift the running water or improve water and ecological environment.

The outdoor rainwater reservoir water replenishing device shown in fig. 1 comprises two parts, namely a rainwater discarding well and a rainwater reservoir, wherein a rainwater clean water basin is not arranged, a rainwater pipe A for rainwater entering and exiting and a rainwater pipe D for initial rainwater discarding and filtering are arranged on the rainwater discarding well B, rainwater is discarded and filtered through a discarding flow pipe in the rainwater discarding well B and a discarding flow device C, then the rainwater is converged into an outdoor reservoir E with an inspection manhole F at the top, and is input into a rainwater distribution pipe network through a pressurizing device and a pipe network K after simple treatment such as filtering and precipitation, and is supplied to rainwater points, such as water facilities for greening, landscaping and flushing. Because a clean water tank is not arranged, in order to ensure that the rainwater reuse system continuously supplies water, a tap water pipe L and a water level sensor for supplementing water are arranged in the outdoor reservoir E, and the automatic water supplementing of the water tank is realized. The opening and closing of the electromagnetic valve N are controlled through a water level sensor in the outdoor water storage pool E, when the water level sensor senses that the water level in the rainwater storage pool reaches a high water level I, the electromagnetic valve N of the L on the tap water pipe stops working, and water supplement for the water storage pool is stopped. When the water level sensor senses that the water level in the rainwater reservoir is lower than the low water level J, the electromagnetic valve N on the tap water pipe starts to work, and the reservoir is replenished with water by using tap water. The water supply tap water pipe L can also be provided with a maintenance gate valve Q for maintenance, a backflow preventer O for preventing backflow of return water, a water meter P for metering and an electromagnetic valve N capable of being automatically started and stopped, and the above valve accessories are all arranged in the underground valve well M. The water supply pipe mouth of pipe of moisturizing sets up in the cistern, and the delivery port of the water supply pipe L of moisturizing usefulness is higher than the overflow water level H of overflow pipe G in the cistern, and its both intervals must not be less than 2.5 times water supply pipe diameters, and perpendicular interval is not less than 150mm, prevents through above mode that the backward flow pollutes life drinking water. In addition, still can be provided with overflow horn mouth and overflow pipe G in the cistern, when the water level was higher than overflow water level H in the cistern, the rainwater passed through overflow mouth and pipeline and discharged municipal drainage system.

However, when rainstorm falls, the inflow of rainwater into the reservoir increases sharply, and when the overflow amount of the overflow pipe and the water supply and drainage amount of the pressurizing equipment and the pipe network are smaller than the inflow, the water level of the outdoor reservoir E rises continuously until the overflow pipe rises to the top of the inspection manhole F and overflows. Because the water quality of the pool water is poor, the water replenishing port can be polluted, and the pollution danger exists; in addition, the inflow rate of rainwater is randomly changed and is uncontrollable, so that the possibility of filling the water pool is realized. Therefore, the water supply, drainage and water saving general standard for buildings (GB 55020-2021) implemented in 2022, 4 and 1 are regulated as follows: "when using drinking water to replenish the outdoor rainwater reservoir, the inlet of the replenishing pipe should not be submerged under the condition of rainstorm and ponding on the outdoor ground", the above scheme of replenishing water to the outdoor rainwater reservoir shown in fig. 1 cannot be directly adopted.

In addition, even though the existing outdoor rainwater reservoir water supplementing device is provided with a rainwater clean water tank as in the Chinese patent application CN 201711084813.3-a rainwater collection system and a rainwater collection method thereof, because a water supplementing pipe orifice for supplementing water to the rainwater reservoir is also directly arranged in the clean water tank positioned underground, when heavy rainstorm occurs, the clean water tank can be filled due to random variation and uncontrollable property of inflow of rainwater, and at the moment, the tap water pipe orifice still has the danger of being submerged and polluted by the rainwater in the clean water tank.

Therefore, to the problem that the moisturizing mouth of outdoor rainwater cistern among the prior art easily is submerged and pollutes under outdoor ground torrential rain ponding condition, need urgently to design an outdoor rainwater cistern moisturizing device.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Based on this, the utility model provides an outdoor rainwater cistern moisturizing device, this moisturizing device can effectively avoid the running water mouth of pipe of moisturizing to be polluted by the rainwater and submerge when falling the torrential rain, and has reduced the construction degree of difficulty and the cost of valve well.

(II) technical scheme

For solving the technical problem, the utility model provides an outdoor rainwater cistern moisturizing device, including cutting off water tank outlet pipe, cutting off water tank, water pipe, solenoid valve, backflow preventer, water gauge and gate valve, set up subaerial gate valve, water gauge, backflow preventer, solenoid valve and water pipe series connection in proper order set up subaerial cut off water tank and underground outdoor cistern and pass through cut off water tank outlet pipe intercommunication, the delivery port of water pipe set up in cut off the top or the lateral wall of water tank, the delivery port of water pipe is higher than cut off the overflow water level of overflow pipe on the water tank, the level that cuts off the water inlet of water tank outlet pipe is higher than and is located the level of the maintenance manhole at outdoor cistern top, the delivery port that cuts off the water tank outlet pipe is higher than overflow water level in the outdoor cistern.

Furthermore, the partition water tank, the tap water pipe, the electromagnetic valve, the backflow preventer, the water meter and the gate valve are all arranged in the above-ground valve well.

Furthermore, the above-ground valve well is arranged above the inspection manhole, the bottom of the above-ground valve well is fixed with the ground through bolts, a 300-300 plain concrete base is poured in advance at a fixed point, and foundation bolts are embedded in advance.

Furthermore, the above-ground valve well is a reinforced heat-preservation integrated valve well.

Furthermore, the top of the outdoor rainwater reservoir maintenance manhole is provided with a well cover with an anti-falling net.

Further, be equipped with in the wall water tank and examine and repair manhole, instrumentation, breather pipe, overflow pipe, blow-down pipe and inlet tube, instrumentation, breather pipe and inlet tube are installed at wall water tank top, the side at the wall water tank is installed to overflow pipe and blow-down pipe.

Furthermore, the water outlet of the tap water pipe should be higher than the overflow water level in the partition water tank by at least 150mm, and the water outlet of the water outlet pipe of the partition water tank should be higher than the overflow water level of the overflow hole on the outdoor reservoir by at least 150 mm.

Furthermore, the water outlet pipe of the partition water tank adopts overflow type water outlet, and the water inlet of the water outlet pipe of the partition water tank is positioned at the overflow water level in the partition water tank.

Furthermore, the electromagnetic valve is controlled to be switched on and off according to the water level of the outdoor reservoir.

Furthermore, a ladder stand is arranged in the above-ground valve well.

(III) advantageous effects

Compared with the prior art, the utility model discloses an outdoor rainwater cistern moisturizing device possesses following advantage:

(1) The utility model discloses an outdoor rainwater cistern moisturizing device is through setting up on ground and cutting off the water tank to and set up the wall water tank outlet pipe that is higher than the maintenance manhole, can effectively avoid preventing drinking water moisturizing pipe delivery port when taking place heavy rainstorm or flood that the rainwater pollutes and submerges in outdoor cistern, the effectual air space who realizes between rainwater and the running water.

(2) The underground valve well in the prior art is arranged underground and has the following problems: firstly, the valve well is arranged underground, the earthwork excavation needs to be considered, and the valve well needs to consider the waterproof measure; and secondly, the valve well is arranged underground, the water outlet of the backflow preventer can be submerged, and a water drainage facility is arranged in the valve well in order to prevent the water outlet of the backflow preventer from being submerged by water. Thirdly, the valve well is arranged underground, so that the construction difficulty is high, and the initial manufacturing cost is high. And the utility model discloses an outdoor rainwater cistern moisturizing device compares with the construction scheme among the prior art, because the utility model discloses a device and running water valve well all arrange the ground of outdoor terrace in, can reduce earthwork excavation volume by a wide margin, have reduced the construction cost and the degree of difficulty, improve the efficiency of construction.

Drawings

The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and are not to be understood as imposing any limitation on the invention, and in which:

fig. 1 is a schematic structural view of a water replenishing device of an outdoor rainwater storage tank in the prior art, which is not provided with a rainwater clean water tank;

fig. 2 is the utility model discloses an outdoor rainwater cistern moisturizing device's schematic structure diagram.

Wherein corresponding reference numerals in fig. 1 are: A. the rainwater pipe, B, abandon a class well, C, abandon a class pipe and abandon a class device, D, the initial stage is abandoned and is flowed the rainwater pipe after filtering, E, outdoor cistern, F, overhaul manhole, G, overflow pipe, H, overflow water level, I, high water level (running water stops the moisturizing), J, low water level (running water moisturizing), K, compression equipment and pipe network, L, running water pipe, M, underground valve well, N, solenoid valve, O, backflow preventer, P, water gauge, Q, gate valve.

Corresponding reference numerals in fig. 2 are: 1. the system comprises a rainwater pipe 2, a flow abandoning well 3, a flow abandoning pipe and flow abandoning device 4, a rainwater pipe 5 after initial flow abandoning and filtering, an outdoor reservoir 6, an inspection manhole 7, an overflow hole 8, an overflow water level 9, a high water level (tap water stops replenishing) 10, a low water level (tap water replenishing) 11, a pressurizing device and pipe network 12, an upper water tank water outlet pipe 13, an upper valve well 14, an upper water tank 15, a water pipe 16, an electromagnetic valve 17, a backflow preventer 18, a water meter 19 and a gate valve.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from the embodiments described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not limited to the embodiments disclosed below.

In order to ensure that the water replenishing device of the underground outdoor rainwater reservoir meets the regulation of the national standard' general code for water supply and drainage and water saving (GB 55020-2021) of building: "when adopting the drinking water of living to outdoor rainwater cistern moisturizing, the moisturizing mouth of pipe must not be submerged under outdoor ground heavy rain ponding condition", the utility model discloses outdoor rainwater cistern moisturizing device among the prior art as shown in figure 1 has been improved to avoid the running water mouth of pipe of moisturizing to be polluted by the rainwater and submerge when falling the heavy rain.

Referring to fig. 2, when a pipeline capable of drinking tap water supplies water to an underground outdoor reservoir, in order to avoid pollution of a drinking water pipeline, the utility model improves and designs a novel outdoor rainwater reservoir water supply device on the basis of fig. 1, which comprises a partition water tank outlet pipe 12, a partition water tank 14, a tap water pipe 15, an electromagnetic valve 16, a backflow preventer 17, a water meter 18 and a gate valve 19, wherein the gate valve 19, the water meter 18, the backflow preventer 17, the electromagnetic valve 16 and the tap water pipe 15 are sequentially connected in series, the partition water tank 14 is arranged on the ground, the partition water tank 14 is communicated with the outdoor reservoir 5 through the partition water tank outlet pipe 12, a water outlet of the tap water pipe 15 is arranged at the top or the side wall of the partition water tank 14, a water outlet of the tap water pipe 15 is higher than an overflow water level of an overflow pipe on the partition water tank 14, a water inlet of the partition water tank outlet pipe 12 is higher than a water level of an inspection manhole 6 arranged at the top of the outdoor reservoir 5, and a water outlet of the partition water tank outlet pipe 12 is higher than an overflow water level 8 of an overflow hole 7 on the outdoor reservoir 5. Therefore, the utility model discloses a set up at subaerial and cut off water tank 14 and cut off water tank outlet pipe 12 to set up their height and position rationally, carry out indirect moisturizing to outdoor cistern 5, thereby rainwater pollution drinking water pipe mouth's the condition appears when preventing the torrential rain.

In another embodiment, the shut-off tank 14, the tap water pipe 15, the solenoid valve 16, the backflow preventer 17, the water meter 18, and the gate valve 19 are disposed in the above-ground valve well 13 to integrally protect the above-ground water replenishing apparatus.

Preferably, the above-ground valve well 13 is a reinforced heat-preservation integrated valve well, the water well is made of inorganic glass fiber reinforced plastic, and a heat-preservation material, namely a foam rubber-plastic product, is used for freeze prevention and heat preservation; the water meter well adopts a folding split mounting type anti-theft well cover, and the bottom of the side wall of the water well is provided with

The drainage hole, the entrance to a cave of drainage hole sets up the protection against insects screen panel. In addition, a ladder stand is arranged in the above-ground valve well 13, so that maintenance personnel can freely enter and exit the above-ground valve well. In addition, the above-ground valve well 13 can also be optionally arranged above the inspection manhole 6 of the outdoor water storage tank 5, the bottom of the above-ground valve well 13 is not provided with a well bottom, the bottom of the above-ground valve well 13 is fixed with the ground by bolts, 300-300 plain concrete bases are poured in advance at fixed points, and foundation bolts are embedded in advance.

In another embodiment, a manhole cover with an anti-falling net is arranged at the top of an inspection manhole 6 of the outdoor reservoir 5, an initial flow-discarding filtered rainwater pipe 4 is connected to one side of the outdoor reservoir 5 far away from a water outlet pipe 12 of the water blocking tank, a rainwater pipe 1 for rainwater entering and exiting and an initial flow-discarding filtered rainwater pipe 4 are arranged on the flow-discarding well 2, rainwater is discarded and filtered through a flow-discarding pipe and a flow-discarding device 3 in the flow-discarding well 2 and then collected into the outdoor reservoir 5 with the inspection manhole 6 at the top, a pressurizing device and a pipe network 11 at the bottom of the outdoor reservoir 5 input rainwater into a rainwater distribution pipe network for supplying water for greening, landscaping, flushing and the like, an electromagnetic valve 16 and a tap water pipe 15 automatically replenish water to the outdoor reservoir 5 through a water blocking tank 14 and a water outlet pipe 12 of the water blocking tank according to water level signals corresponding to a high water level 9 and a low water level 10, and an overflow water level 8 of an overflow hole 7 is higher than the high water level 9 and lower than a water outlet pipe 12 of the water blocking tank. In addition, the partition water tank outlet pipe 12 adopts an overflow type outlet mode (i.e. the partition water tank outlet pipe guides out water higher than an overflow water level), i.e. in order to avoid that the water in the partition water tank is still drained to the outdoor reservoir 5 through the partition water tank outlet pipe 12 after the tap water pipe 15 is closed, and the water level of the outdoor reservoir 5 is changed, the water inlet of the partition water tank outlet pipe 12 can be arranged at the overflow water level of the partition water tank 14, so that the water flowing into the partition water tank 14 from the tap water pipe 15 is overflowed and guided out to the outdoor reservoir 5 in real time, and the water level of the partition water tank 14 is always full during the overflow outlet. Of course, because the volume of the partition water tank 14 is relatively small, even if the water inlet position of the partition water tank outlet pipe 12 is lower than the overflow water level of the partition water tank 14, the water level in the outdoor reservoir 5 is slightly changed, and thus the partition water tank outlet pipe 12 does not adopt an overflow water outlet mode.

In another embodiment, in order to facilitate maintenance and management of the small and medium-sized partition water tank 14 on the ground, a service manhole, a flow guide plate, a detection instrument, a vent pipe, an emptying pipe and a water inlet pipe (not shown in fig. 2) may be further disposed in the partition water tank 14, and the above pipes and structures are all conventional in water tanks. The inspection manhole is arranged at the top of the partition water tank 14 and used for inspecting and maintaining the interior of the water tank; the guide plate is arranged in the partition water tank and used for preventing the water tank from generating dead water or short flow; accessories such as a detection instrument, a vent pipe, a water inlet pipe and the like are also arranged at the top of the partition water tank so as to be used for ventilating and feeding water into the water tank; the discharging pipe of the discharging pipe 12 of the separating water tank is arranged on the side surface of the separating water tank.

In addition, in order to safely realize the air-water isolation between rainwater and tap water, the water outlet of the tap water pipe 15 in the partition water tank 14 should be higher than the overflow water level in the partition water tank 14 (overflow holes or overflow pipes can be arranged in the partition water tank to realize overflow) by at least more than 150mm, and the water outlet of the partition water tank water outlet pipe 12 is higher than the overflow water level of the overflow holes on the outdoor water storage tank 5 by at least more than 150mm, so that an effective air gap is formed.

In order to make clear further the utility model discloses an advantage, the following theory of operation that will introduce outdoor rainwater cistern moisturizing device:

when the device normally works, the electromagnetic valve 16 is controlled to be automatically opened and closed through a water level sensor (not shown in the figure) arranged in the outdoor reservoir 5, the water level sensor is used for detecting high and low water levels corresponding to a high water level 9 and a low water level 10 in the outdoor reservoir 5, when the water level sensor in the outdoor reservoir senses that the water level in the reservoir reaches the low water level, a signal is transmitted to the electromagnetic valve 16, the electromagnetic valve 16 is opened to work, water is further fed into the water blocking tank 14, and meanwhile, water in the water tank starts to flow out through the water blocking tank water outlet pipe 12 to supplement water to the outdoor reservoir 5; when the water level sensor senses that the water level in the outdoor water storage tank reaches a high water level, a signal is transmitted to the electromagnetic valve 16, the electromagnetic valve stops working, water feeding into the partition water tank 14 is stopped, the water is not supplemented to the partition water tank, water supplementing to the outdoor water storage tank 5 is stopped, and the water level control mode belongs to a conventional water tank water level control mode.

When heavy rainstorm occurs, the rainfall amount flowing into the flow abandoning well 2 and the rainwater pipe 1 is increased sharply, the filtered rainfall amount of the flow abandoning pipe and the flow abandoning device 2 and the initial flow abandoning filtered rainfall amount of the rainwater pipe 4 are also increased, and then the water level of the outdoor reservoir 5 is continuously increased, so that the overflow hole 7 is submerged, the underground outdoor reservoir 5 is filled, and at the moment, the water in the reservoir overflows to the ground through the maintenance manhole 6 at the top of the outdoor reservoir. Although the water outlet pipe 12 of the water blocking tank arranged in the outdoor reservoir 5 is submerged, the height of the water inlet of the water outlet pipe 12 of the water blocking tank is higher than that of the maintenance manhole 6 of the outdoor reservoir, so that rainwater in the outdoor reservoir can be effectively blocked from flowing back into the water blocking tank through the water outlet pipe of the water blocking tank. Further, if the external rainwater enters the partition water tank 14 accidentally, the water amount of the water entering the partition water tank can be controlled by the overflow pipe in the partition water tank 14, and meanwhile, the water outlet of the tap water pipe 15 is higher than the overflow water level of the partition water tank 14. This design makes it possible to effectively prevent the outlet of the tap water pipe 15 from being polluted by rainwater entering the partition water tank 14 even when a heavy storm or even a flood occurs.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description and simplicity of description only, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the stated number of technical features is essential, and thus features defined as "first" and "second" may explicitly or implicitly include one or more of those features unless explicitly stated or limited otherwise. The terms "connected" and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; the two elements may be mechanically, electrically, directly or indirectly connected through an intermediate medium, or may be interconnected internally or "drivingly connected", i.e., dynamically connected through any suitable means, such as belt drive, gear drive or sprocket drive. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations are within the scope defined by the appended claims.

Claims (10)

1. The utility model provides an outdoor rainwater cistern moisturizing device, its characterized in that, including cutting off water tank outlet pipe, cutting off water tank, water pipe, solenoid valve, backflow preventer, water gauge and gate valve, set up subaerial gate valve, water gauge, backflow preventer, solenoid valve and water pipe series connection in proper order set up subaerial cut off water tank and outdoor cistern of underground pass through cut off water tank outlet pipe intercommunication, the delivery port of water pipe set up in cut off the top or the lateral wall of water tank, the delivery port of water pipe is higher than cut off overflow water level in the water tank, the level that cuts off the water inlet of water tank outlet pipe is higher than and is located the level of the maintenance manhole at outdoor cistern top, the delivery port that cuts off the water tank outlet pipe is higher than the overflow water level of outdoor cistern.

2. The apparatus of claim 1, wherein the shut-off tank, the tap water pipe, the solenoid valve, the backflow preventer, the water meter, and the gate valve are disposed in an above-ground valve well.

3. The outdoor rainwater storage pool water supplementing device according to claim 2, wherein the above-ground valve well is arranged above the service manhole, the bottom of the above-ground valve well is fixed with the ground through bolts, a 300-300 plain concrete base is poured in advance at the fixed point, and foundation bolts are embedded in the base.

4. The apparatus of claim 2, wherein the above ground valve well is a reinforced thermal insulation integrated valve well.

5. The moisturizing device of an outdoor rainwater storage pool of claim 1, wherein a manhole cover with an anti-falling net is arranged on the top of a manhole of the outdoor rainwater storage pool.

6. The outdoor rainwater storage tank water supplementing device according to claim 1, wherein an inspection manhole, a detection instrument, a vent pipe, an emptying pipe and a water inlet pipe are arranged in the partition water tank, the detection instrument, the vent pipe and the water inlet pipe are arranged at the top of the partition water tank, and the emptying pipe is arranged on the side face of the partition water tank.

7. The replenishing device of claim 1, wherein the outlet of the tap water pipe is at least 150mm higher than the overflow level in the isolated water tank, and the outlet of the isolated water tank outlet pipe is at least 150mm higher than the overflow level of the outdoor reservoir.

8. The apparatus of claim 1, wherein the cut-off tank outlet pipe is overflow, and the inlet of the cut-off tank outlet pipe is located at an overflow level in the cut-off tank.

9. The apparatus of claim 1, wherein the solenoid valve is automatically controlled according to a water level of the outdoor rainwater storage tank.

10. The apparatus of claim 2, wherein a ladder is provided in the above ground valve well.

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