Courtyard rainwater circulation system of sponge city

Abstract

According to the courtyard rainwater circulation system of the sponge city, through the overall design of the base station, the track, the water storage tanks, the driving robot, the balcony filtering floor drain, the recycling pipeline and the water drainage pipeline, impurities in rainwater invading into a balcony can be filtered through the filtering floor drain, and then the rainwater is pumped to the base station water supplementing mechanism; the driving robot is used for driving the water storage tank bodies to move, so that the water storage tank bodies can be supplemented with water one by one, and when irrigation is needed in sunny days, the water storage tank bodies can be moved to the positions of balcony green plants respectively, a second valve is opened, and drip irrigation operation is carried out. When drip irrigation of green plants is not needed, the water storage tank bodies are arranged at the positions close to the wall of the balcony and combined to form the wall painting display body, the water storage tank bodies and the courtyard type balcony are fused, and abrupt large-size tank bodies are avoided.

Description

Technical Field

[0001] This invention relates to the field of garden maintenance technology, specifically to a courtyard rainwater recycling system for sponge cities. Background Technology

[0002] Sponge city, also known as "water-resilient city," refers to a city development model that strengthens urban planning, construction, and management so that the city can function like a sponge, leveraging the absorption, infiltration, and slow release of rainwater through buildings, roads, green spaces, and water systems to effectively control rainwater runoff and achieve natural storage, infiltration, and purification.

[0003] Traditional building rainwater storage and reuse typically involves installing rainwater storage equipment on the rooftop, and then guiding it through pipes to each floor for use. The problem with existing technology is that the current promotion of fourth-generation housing has made the traditional rooftop rainwater storage solution flawed. Fourth-generation housing, also known as courtyard house, vertical garden ecological housing or urban forest garden architecture, combines green ecological concepts with modern high-rise buildings and upgrades the living environment through technologies such as sky gardens and vertical greening.

[0004] Compared to traditional housing, fourth-generation housing has significantly increased green space, and the height of balconies also increases the amount of rainwater and dust intrusion. The water demand for irrigation of the entire building and cleaning of dust on the balcony floor has increased significantly, which traditional rooftop rainwater storage cannot meet.

[0005] If conventional water tanks are installed on each floor, they will take up a lot of space. In addition, since courtyard balconies are already open and airy, the size of the water tanks would be conspicuous and out of place with the scenery of the courtyard balcony, affecting the overall aesthetics.

[0006] Therefore, how to meet the water demand of fourth-generation residential courtyard balconies, integrate balcony green landscape design, and provide residents with rainwater collection, storage, and reuse equipment are the problems that sponge city construction needs to overcome in the future. Summary of the Invention

[0007] To address the shortcomings of the aforementioned technologies, this invention provides a courtyard rainwater recycling system for sponge cities.

[0008] The technical solution of the present invention: a courtyard rainwater recycling system for sponge cities, including a base station, a track, several water storage tanks, a drive robot, a balcony filter drain, a reuse pipeline, and a drainage pipeline. The track is set on the top of the balcony and includes a preparation station on the side near the wall and a drip irrigation station on the side near the green plants. The track is provided with a first chute with an opening facing vertically downward and a second chute located on the side of the first chute. The base station is set up in the preparation station. The base station is equipped with a control chip, a first interception mechanism that extends and retracts into the first chute, and a water replenishment mechanism. The water replenishment mechanism is connected to the reuse pipeline. The balcony filter drain is equipped with a raindrop sensor and is connected to the reuse pipeline and the drainage pipeline via a tee. The drainage pipeline is equipped with a first electrically controlled valve, and the reuse pipeline is equipped with a pump body. The pump body, the first electrically controlled valve, the raindrop sensor, the base station, and the drive robot PLC are linked together to pump the balcony rainwater to the water replenishment mechanism or discharge it to the drainage pipeline according to the raindrop sensor. Each of the aforementioned water storage tanks includes a connecting part, a water storage chamber, and a drip irrigation part. The connecting part is equipped with a slider that is adapted to the first sliding groove. The drip irrigation part is equipped with a water outlet pipe that connects to the water storage chamber. A second valve and a drip nozzle are provided at the water outlet pipe. The second valve controls the opening and closing of the water outlet pipe. The water storage tank is equipped with a connection interface at the relative position of the water replenishment mechanism at the preparation station. The water storage chamber is equipped with a water inlet pipe and a one-way valve that connect to the connection interface. The driving robot includes a frame, a control chip, a driving module that slides along a second slide rail, and a second interception mechanism. The second interception mechanism extends and retracts toward the water storage tank at the first slide groove, and drives the water storage tank to move forward or backward along the first slide groove. The second interception mechanism moves the water storage tank to the preparation position and clamps the water storage tank in conjunction with the first interception structure, aligning the interface with the water replenishment mechanism. The water replenishment mechanism extends into the interface and injects rainwater from the reuse pipeline. When it is time to water the green plants, the second interception structure moves the water storage tank to the drip irrigation position and opens the second valve to drip irrigate the green plants on the balcony. The several water storage tanks are arranged in a strip shape corresponding to the height of the balcony, and their outer surfaces are decorated with related patterns, colors or films. When these water storage tanks are arranged together in the preparation station, close to the balcony wall, they form a mural display.

[0009] A further feature of the present invention is that the base station includes a telescopic water supply pipe, a corrugated pipe, and a first drive motor. The two ends of the corrugated pipe are respectively connected to the telescopic water supply pipe and the reuse pipe. The telescopic water supply pipe is slidably engaged with the frame and includes an insertion end adapted to the interface. A first rack is provided on the outer circumferential surface of the telescopic water supply pipe along the axial direction. The first drive motor is provided with a first gear that meshes with the first rack and controls the telescopic water supply pipe to move closer to the interface or retract along the axial direction.

[0010] A further feature of the present invention is that the first interception mechanism includes a second rack and a second drive motor. The second motor is provided with a second gear that meshes with the second rack. The second rack slides closer to or further away from the first slide groove with the frame. The second gear drives the second rack to slide.

[0011] A further feature of the present invention is that the second rack has grooves on both sides of its end near the water storage tank, and a first proximity switch is provided in each of the grooves on both sides. The first proximity switch detects that the second rack intercepts the water storage tank and transmits a signal to the control chip of the base station.

[0012] Using the above technical solution, a proximity switch is used to detect whether the interception mechanism is in contact with the water storage tank.

[0013] Further features of the present invention: The driving robot also includes a frame, guide wheels, a wireless charging power module, and a walking wheel module. The base station is provided with a wireless charging module on the second slide rail path. The wireless charging module charges the stationary driving robot. The cross-section of the second slide rail is I-shaped. The walking wheel module is locked to the second slide rail and rolls along its positive direction. The guide wheels abut against the track to assist the movement of the driving robot. The second interception mechanism includes a third rack and a third drive motor. The third motor is equipped with a third gear that meshes with the third rack. The third rack slides closer to or further away from the first slide groove with the frame. The second gear drives the second rack to slide.

[0014] A further feature of the present invention is that the water storage tank is provided with a first electrode contact on one side of the slider, the second valve is an electrically controlled valve, and a wire is provided that connects to the first electrode contact along the water storage tank. The drive robot is equipped with a pair of second interception mechanisms corresponding to the width of the water tank. The third rack has grooves on both sides of its end near the water tank, and a second proximity switch is installed in each groove. The second proximity switch detects that the third rack intercepts the water tank and transmits a signal to the control chip of the drive robot. When the third rack on one side of the pair of second interception mechanisms detects the water tank, it identifies whether the water tank is located between or outside the pair of second interception mechanisms. It then controls the alternating extension and retraction of the pair of second interception mechanisms and the movement of the walking wheel module to clamp the water tank in a fixed position between the pair of second interception mechanisms. The driving robot also includes a second electrode contact disposed between a pair of second interception mechanisms and corresponding to the position of the first electrode contact. The wireless charging power module is connected to the second electrode contact and supplies power to the second valve through the first electrode contact and wires according to the position of the driving robot and the signal of the pair of interception mechanisms clamping the water storage tank. The second valve is energized to open and close the water outlet pipe.

[0015] A further feature of the present invention is that a plurality of drive robots are arranged on the track.

[0016] A further feature of the present invention is that the pump body is connected to a tap water inlet pipe, and a third electrically controlled valve controlled by a PLC is installed on the tap water inlet pipe.

[0017] A further feature of the present invention is that the drainage pipes of each floor are connected, and a fourth electrically controlled valve is installed for each floor. The fourth electrically controlled valve guides excess rainwater from the higher floors to replenish the lower floors.

[0018] The beneficial effects of this invention are as follows: As shown in the accompanying drawings, through the overall design of the base station, track, several water storage tanks, drive robot, balcony filter drain, reuse pipeline, and drainage pipeline, rainwater intruding into the balcony can be filtered by the filter drain to remove debris, and then pumped to the base station water replenishment mechanism and stored in the water storage tank at the preparation station. The drive robot moves the water storage tanks, allowing several water storage tanks to be replenished one by one. When watering is needed on a sunny day, each tank can be moved to the location of the green plants on the balcony, and the second valve can be opened to carry out drip irrigation.

[0019] When drip irrigation is not needed for the plants, the water tanks are arranged close to the balcony wall to form a mural display, integrating the water tanks with the courtyard-style balcony and avoiding the abruptness of the large tanks. Attached Figure Description

[0020] Figure 1 The structure of this embodiment of the invention Figure 1 ; Figure 2 The structure of this embodiment of the invention Figure 2 ; Figure 3 The structure of this embodiment of the invention Figure 3 ; Figure 4 The structure of this embodiment of the invention Figure 4 ; Figure 5 The structure of this embodiment of the invention Figure 5 .

[0021] Figure 6 The structure of this embodiment of the invention Figure 6 .

[0022] Figure 7 The structure of this embodiment of the invention Figure 7 .

[0023] Figure 8 The structure of this embodiment of the invention Figure 8 .

[0024] Among them, the base station 1, telescopic water supply pipe 11, corrugated pipe 12, first drive motor 13, first rack 14, first gear 15, second rack 16, first proximity switch 161, track 2, first slide groove 21, second slide rail 22, several water storage tanks 3, slider 31, water storage chamber 32, water outlet pipe 33, second valve 34, drip nozzle 35, interface 36, water inlet pipe 37, one-way valve 38, first electrode contact 39, drive robot 4, frame 41, walking wheel module 42, third rack 43, second proximity switch 431, second electrode contact 44, balcony filter drain 5, reuse pipeline 51, pump body 511, drainage pipeline 52, tap water inlet pipeline 53, first electric control valve 521, third electric control valve 531, balcony 6, and wall 61.

[0025] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual size of the product. Furthermore, the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0027] The invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1-8 As shown, A sponge city courtyard rainwater recycling system includes a base station 1, a track 2, several water storage tanks 3, a drive robot 4, a balcony 6 filter drain 5, a reuse pipeline 51, and a drainage pipeline 52. The track 2 is set on the top of the balcony 6 and includes a preparation station on the side near the wall 61 and a drip irrigation station on the side near the green plants. The track 2 is provided with a first chute 21 with an opening facing vertically downward and a second slide rail 22 located on the side of the first chute 21. The base station 1 is set in the preparation station. The base station 1 is equipped with a control chip, a first interception mechanism that extends and retracts into the first slide 21, and a water replenishment mechanism. The water replenishment mechanism is connected to the reuse pipeline 51. The filter drain 5 of the balcony 6 is equipped with a raindrop sensor and is connected to the reuse pipeline 51 and the drainage pipeline 52 by a tee. The drainage pipeline 52 is equipped with a first electrically controlled valve 521. The reuse pipeline 51 is equipped with a pump body 511. The pump body 511, the first electrically controlled valve 521, the raindrop sensor, the base station 1, and the drive robot 4 PLC are linked together to pump rainwater from the balcony 6 to the water replenishment mechanism or discharge it to the drainage pipeline 52 according to the raindrop sensor. Each of the plurality of water storage tanks 3 includes a connecting part, a water storage chamber 32, and a drip irrigation part. The connecting part is provided with a slider 31 adapted to the first sliding groove 21. The drip irrigation part is provided with a water outlet pipe 33 communicating with the water storage chamber 32. A second valve 34 and a drip nozzle 35 are provided at the water outlet pipe 33. The second valve 34 controls the opening and closing of the water outlet pipe 33. The water storage tank 3 is provided with a connection interface 36 at the relative position of the water replenishment mechanism at the preparation station. The water storage chamber 32 is provided with a water inlet pipe 37 communicating with the connection interface 36 and a one-way valve 38. The drive robot 4 includes a frame 41, a control chip, a drive module that slides along the second slide rail 22, and a second interception mechanism. The second interception mechanism extends and retracts toward the water storage tank 3 at the first slide groove 21, and drives the water storage tank 3 to move forward or backward along the first slide groove 21. The second interception mechanism moves the water storage tank 3 to the preparation position and clamps the water storage tank 3 in conjunction with the first interception structure, so that the interface 36 is aligned with the water replenishment mechanism. The water replenishment mechanism extends into the interface 36 and injects rainwater from the reuse pipeline 51. When it is time to water the green plants, the second interception structure moves the water storage tank 3 to the drip irrigation position and opens the second valve 34 to drip irrigate the green plants on the balcony 6. The plurality of water storage tanks 3 are arranged in a strip shape corresponding to the height of the balcony 6, and their outer surfaces are decorated with related patterns, colors or films. When the plurality of water storage tanks 3 are arranged together in the preparation station, they are close to the wall of the balcony 6 and are combined to form a mural display.

[0028] The base station 1 includes a telescopic water supply pipe 11, a corrugated pipe 12, and a first drive motor 13. The two ends of the corrugated pipe 12 are respectively connected to the telescopic water supply pipe 11 and the reuse pipe 51. The telescopic water supply pipe 11 is slidably engaged with the frame 41 and includes an insertion end adapted to the interface 36. The outer circumferential surface of the telescopic water supply pipe 11 is provided with a first rack 14 along the axial direction. The first drive motor 13 is provided with a first gear 15 that meshes with the first rack 14 and controls the telescopic water supply pipe 11 to move closer to the interface 36 or retract along the axial direction.

[0029] The first interception mechanism includes a second rack 16 and a second drive motor 17. The second motor is provided with a second gear that meshes with the second rack 16. The second rack 16 slides with the frame 41, moving closer to or further away from the first slide groove 21. The second gear drives the second rack 16 to slide.

[0030] The second rack 16 has grooves on both sides of its end near the water storage tank 3, and a first proximity switch 161 is provided in each of the grooves on both sides. The first proximity switch 161 detects that the second rack 16 intercepts the water storage tank 3 and transmits a signal to the control chip of the base station 1.

[0031] The proximity switch is used to detect whether the interception mechanism is in contact with the water storage tank.

[0032] The drive robot 4 also includes a frame 41, guide wheels, a wireless charging power module, and a walking wheel module 42. The base station 1 is provided with a wireless charging module 18 along the path of the second slide rail 22. The wireless charging module 18 charges the stationary drive robot 4. The second slide rail 22 has an I-shaped cross-section. The walking wheel module 42 is engaged with the second slide rail 22 and rolls along its positive direction. The guide wheels abut against the track 2 to assist the drive robot 4 in moving. The second interception mechanism includes a third rack 43 and a third drive motor. The third motor is equipped with a third gear that meshes with the third rack 43. The third rack 43 slides closer to or further away from the first slide groove 21 with the frame 41. The second gear drives the second rack 16 to slide.

[0033] The water storage tank 3 is provided with a first electrode contact 39 on one side of the slider 31, and the second valve 34 is an electrically controlled valve, and is provided with a wire that connects to the first electrode contact 39 along the water storage tank 3; The drive robot 4 is equipped with a pair of second interception mechanisms corresponding to the width of the water tank 3. The third rack 43 has grooves on both sides of its end near the end of the water tank 3, and a second proximity switch 431 is installed in each of the grooves. The second proximity switch 431 detects that the third rack 43 intercepts the water tank 3 and transmits a signal to the control chip of the drive robot 4. When one side of the third rack 43 of the pair of second interception mechanisms detects the water tank 3, it identifies whether the water tank 3 is located between or outside the pair of second interception mechanisms. It then controls the pair of second interception mechanisms to extend and retract alternately and the movement of the walking wheel module 42 to clamp the water tank 3 in a fixed position between the pair of second interception mechanisms. The driving robot 4 also includes a second electrode contact 44 disposed between a pair of second interception mechanisms and corresponding to the position of the first electrode contact 39. The wireless charging power module is connected to the second electrode contact 44 and supplies power to the second valve 34 through the first electrode contact 39 and the wire according to the position of the driving robot 4 and the signal of the pair of interception mechanisms clamping the water storage tank 3. The second valve 34 is energized to open and close the water outlet pipe 33.

[0034] Several drive robots 4 are installed on the track 2.

[0035] The pump body 511 is connected to a tap water inlet pipe 53, and a third electrically controlled valve 531 controlled by a PLC is installed on the tap water inlet pipe 53.

[0036] The drainage pipes of each floor are connected, and a fourth electrically controlled valve is installed for each floor. This fourth electrically controlled valve guides excess rainwater from the higher floors to replenish the lower floors.

[0037] As shown in the attached diagram of the instruction manual, the overall design of the base station 1, track 2, several water storage tanks 3, drive robot 4, balcony 6 filter drain 5, reuse pipeline 51, and drainage pipeline 52 allows rainwater intruding into the balcony 6 to be filtered by the filter drain, then pumped to the water replenishment mechanism of the base station 1 and stored in the water storage tank 3 at the preparation station. The drive robot 4 moves the water storage tanks 3, allowing each of the several water storage tanks 3 to be replenished with water one by one. When watering is needed on a sunny day, each tank can be moved to the green plant position on the balcony 6 and the second valve 34 can be opened to carry out drip irrigation.

[0038] When drip irrigation is not needed for the plants, each water storage tank 3 is arranged close to the wall of the balcony 6 to form a mural display, which integrates the water storage tank 3 with the courtyard-style balcony 6 and avoids the abruptness of the large-volume tanks.

[0039] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A courtyard rainwater recycling system for sponge cities, characterized in that: The system includes a base station, a track, several water storage tanks, a drive robot, a balcony filter drain, a reuse pipeline, and a drainage pipeline. The track is set on the top of the balcony and includes a preparation station on the side near the wall and a drip irrigation station on the side near the green plants. The track is equipped with a first chute with its opening facing vertically downward and a second chute located on the side of the first chute. The base station is set up in the preparation station. The base station is equipped with a control chip, a first interception mechanism that extends and retracts into the first chute, and a water replenishment mechanism. The water replenishment mechanism is connected to the reuse pipeline. The balcony filter drain is equipped with a raindrop sensor and is connected to the reuse pipeline and the drainage pipeline via a tee. The drainage pipeline is equipped with a first electrically controlled valve, and the reuse pipeline is equipped with a pump body. The pump body, the first electrically controlled valve, the raindrop sensor, the base station, and the drive robot PLC are linked together to pump the balcony rainwater to the water replenishment mechanism or discharge it to the drainage pipeline according to the raindrop sensor. Each of the aforementioned water storage tanks includes a connecting part, a water storage chamber, and a drip irrigation part. The connecting part is equipped with a slider that is adapted to the first sliding groove. The drip irrigation part is equipped with a water outlet pipe that connects to the water storage chamber. A second valve and a drip nozzle are provided at the water outlet pipe. The second valve controls the opening and closing of the water outlet pipe. The water storage tank is equipped with a connection interface at the relative position of the water replenishment mechanism at the preparation station. The water storage chamber is equipped with a water inlet pipe and a one-way valve that connect to the connection interface. The driving robot includes a frame, a control chip, a driving module that slides along a second slide rail, and a second interception mechanism. The second interception mechanism extends and retracts toward the water storage tank at the first slide groove, and drives the water storage tank to move forward or backward along the first slide groove. The second interception mechanism moves the water storage tank to the preparation position and clamps the water storage tank in conjunction with the first interception structure, aligning the interface with the water replenishment mechanism. The water replenishment mechanism extends into the interface and injects rainwater from the reuse pipeline. When it is time to water the green plants, the second interception structure moves the water storage tank to the drip irrigation position and opens the second valve to drip irrigate the green plants on the balcony. The several water storage tanks are arranged in a strip shape corresponding to the height of the balcony, and their outer surfaces are decorated with related patterns, colors or films. When these water storage tanks are arranged together in the preparation station, close to the balcony wall, they form a mural display.

2. The courtyard rainwater recycling system for sponge cities according to claim 1, characterized in that: The base station includes a telescopic water supply pipe, a corrugated pipe, and a first drive motor. The two ends of the corrugated pipe are connected to the telescopic water supply pipe and the reuse pipe, respectively. The telescopic water supply pipe is slidably fitted with the frame and includes an insertion end adapted to the interface. The outer circumferential surface of the telescopic water supply pipe is provided with a first rack along the axial direction. The first drive motor is provided with a first gear that meshes with the first rack and controls the telescopic water supply pipe to move closer to the interface or retract along the axial direction.

3. A courtyard rainwater recycling system for sponge cities according to claim 1, characterized in that: The first interception mechanism includes a second rack and a second drive motor. The second motor is equipped with a second gear that meshes with the second rack. The second rack slides closer to or further away from the first slide groove with the frame. The second gear drives the second rack to slide.

4. A courtyard rainwater recycling system for sponge cities according to claim 3, characterized in that: The second rack has grooves on both sides of the end near the water tank, and a first proximity switch is installed in each groove. The first proximity switch detects that the second rack intercepts the water tank and transmits a signal to the control chip of the base station.

5. A courtyard rainwater recycling system for sponge cities according to claim 1, characterized in that: The driving robot also includes a frame, guide wheels, a wireless charging power module, and a walking wheel module. The base station is equipped with a wireless charging module on the second slide rail path. The wireless charging module charges the driving robot when it is stationary. The cross-section of the second slide rail is I-shaped. The walking wheel module is locked to the second slide rail and rolls along its positive direction. The guide wheel abuts against the rail to assist the driving robot in moving. The second interception mechanism includes a third rack and a third drive motor. The third motor is equipped with a third gear that meshes with the third rack. The third rack slides closer to or further away from the first slide groove with the frame. The second gear drives the second rack to slide.

6. A courtyard rainwater recycling system for sponge cities according to claim 5, characterized in that: The water storage tank is provided with a first electrode contact on one side of the slider, the second valve is an electrically controlled valve, and a wire is provided along the water storage tank to the first electrode contact; The drive robot is equipped with a pair of second interception mechanisms corresponding to the width of the water tank. The third rack has grooves on both sides of its end near the water tank, and a second proximity switch is installed in each groove. The second proximity switch detects that the third rack intercepts the water tank and transmits a signal to the control chip of the drive robot. When the third rack on one side of the pair of second interception mechanisms detects the water tank, it identifies whether the water tank is located between or outside the pair of second interception mechanisms. It then controls the alternating extension and retraction of the pair of second interception mechanisms and the movement of the walking wheel module to clamp the water tank in a fixed position between the pair of second interception mechanisms. The driving robot also includes a second electrode contact disposed between a pair of second interception mechanisms and corresponding to the position of the first electrode contact. The wireless charging power module is connected to the second electrode contact and supplies power to the second valve through the first electrode contact and wires according to the position of the driving robot and the signal of the pair of interception mechanisms clamping the water storage tank. The second valve is energized to open and close the water outlet pipe.

7. A courtyard rainwater recycling system for sponge cities according to claim 6, characterized in that: Several drive robots are installed on the track.

8. A courtyard rainwater recycling system for sponge cities according to claim 1, characterized in that: The pump body is connected to a tap water inlet pipe, and a third electrically controlled valve controlled by a PLC is installed on the tap water inlet pipe.

9. A courtyard rainwater recycling system for sponge cities according to claim 1, characterized in that: The drainage pipes of each floor are connected, and a fourth electrically controlled valve is installed for each floor. This fourth electrically controlled valve guides excess rainwater from the higher floors to replenish the lower floors.

Images