A water flow bidirectional regulation rainwater garden

Abstract

The utility model provides a kind of water flow two-way regulation rainwater garden, including rainwater garden and prepond, and the rainwater pipe is buried in the side of prepond, and prepond and rainwater garden are connected in the way of overflow, and buffer zone is set between prepond and rainwater garden, and the horizontal arrangement intercommunication pipe is buried in the side of rainwater garden, and intercommunication pipe is used to connect rainwater garden with outside water body, and one-way valve and first overflow pipe are set in the end of intercommunication pipe close to outside water body, and one-way valve only allows water in rainwater garden to flow into outside water body, and first overflow pipe is arranged vertically to intercommunication pipe upwards and is set first overflow port in top end, and second overflow pipe and bypass pipe are set in the end of intercommunication pipe close to rainwater garden, and second overflow pipe is arranged vertically to intercommunication pipe upwards and is set second overflow port in top end, and bypass pipe is lower than intercommunication pipe, and one end of bypass pipe is inserted into rainwater garden, and solenoid valve is set in bypass pipe.The utility model realizes the two-way regulation of water flow in rainwater garden.

Description

Technical Field

[0001] This utility model relates to the field of rain garden technology, specifically to a rain garden with bidirectional water flow regulation. Background Technology

[0002] Rain gardens, also known as bioretention areas, are shallow, naturally formed or artificially excavated green spaces used to collect and absorb rainwater from rooftops or the ground. Through the combined action of plants and soil, the rainwater is purified and gradually infiltrates the soil, playing a role in regulating and replenishing local water resources and groundwater. The transpiration of plants in rain gardens can regulate the humidity and temperature of the air, improving the microclimate. Rain gardens have lower construction costs and are simpler to maintain and manage than lawns. With the acceleration of urbanization, more and more surface runoff and rainwater cycle problems are emerging, leading to water waste and urban ecological degradation, such as urban flooding and biodiversity loss. The promotion and construction of rain gardens is one of the effective ways to solve this problem.

[0003] Based on a summary of existing rain garden construction technologies, the following drawbacks exist: 1. Currently, rain gardens on the market mainly fall into two types: simple planting gravel filtration bioretention zones and complex planting gravel filtration bioretention zones. Both are designed using shallow soil infiltration, requiring a certain thickness of water storage layer to function effectively. During periods of drought or lack of rainfall, some rain gardens may dry out, leading to insufficient water for the plants, resulting in yellowing, wilting, or even death. 2. Most small-scale green rainwater facilities on the market, such as rain gardens, rely on gravel buffer zones for energy dissipation, neglecting the design of small pre-treatment areas similar to pre-treatment ponds. The unidirectional water flow in rain gardens, with a consistent scouring direction, easily leads to decreased surface soil porosity and soil compaction. This reduces water absorption, infiltration, and the ability to adsorb pollutants, causing pollutants to accumulate on the surface of the main structure, causing blockages and ultimately affecting the infiltration and purification effects of the facility. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a rain garden with bidirectional water flow regulation. This invention enables bidirectional regulation of water flow in the rain garden, ensuring that the rain garden always maintains a certain thickness of water storage layer. Furthermore, by setting up a pre-positioned pond, the impact of rainwater and the influence of impurities in the rainwater on the rain garden are reduced.

[0005] To address the aforementioned technical problems, this utility model provides a two-way water flow regulating rain garden, comprising a rain garden and a pre-flush pond. A rainwater pipe is buried on one side of the pre-flush pond for connecting to the municipal rainwater pipe network. The pre-flush pond and the rain garden are connected by an overflow mechanism. A buffer zone is provided between the pre-flush pond and the rain garden. A horizontally arranged connecting pipe is buried on one side of the rain garden for connecting the rain garden to an external water body. The end of the connecting pipe closest to the external water body is equipped with... A one-way valve and a first overflow pipe are provided. The one-way valve only allows water in the rain garden to flow into external water bodies. The first overflow pipe is arranged vertically upwards to the connecting pipe, and a first overflow port is provided at the top of the first overflow pipe. A second overflow pipe and a bypass pipe are provided at the end of the connecting pipe near the rain garden. The second overflow pipe is arranged vertically upwards to the connecting pipe, and a second overflow port is provided at the top of the second overflow pipe. The bypass pipe is lower than the connecting pipe, and one end of the bypass pipe extends into the rain garden. A solenoid valve is provided inside the bypass pipe.

[0006] In some embodiments, the connecting pipe is provided with an outlet at one end near the external water body, and the one-way valve includes a flap valve, which is located at the outlet.

[0007] In some embodiments, a level sensor is provided in the rain garden to monitor the level of water in the rain garden, thereby controlling the opening and closing of the solenoid valve.

[0008] In some embodiments, the external water body includes a lake, and the height of the first overflow outlet is below the normal water level of the lake.

[0009] In some embodiments, a waterfront vegetation buffer zone is planted on the side of the rain garden near the front pond, the waterfront vegetation buffer zone comprising perennial water-tolerant herbaceous plants.

[0010] In some embodiments, a water barrier is provided between the pre-pond and the rain garden, and the side of the water barrier closer to the rain garden is covered with gravel.

[0011] In some embodiments, the height of the covering gravel is higher than that of the water-blocking plate.

[0012] In some embodiments, energy-dissipating gravel is fixedly disposed on one side of the pre-water pond, and the energy-dissipating gravel is arranged near the outlet of the rainwater pipe.

[0013] In some embodiments, a concrete reinforcement layer is provided on one side of the pre-pond, and the energy-dissipating gravel is integrated with the concrete reinforcement layer.

[0014] In some embodiments, sedimentary gravel is disposed at the bottom of the pre-pond.

[0015] The beneficial effects of this utility model are as follows: 1. This utility model, by setting up a pre-emergence pond connected to the rain garden via an overflow system, allows the pre-emergence pond to act as a buffer when rainwater flows in, significantly reducing the direct impact of the water flow on the rain garden. Energy-dissipating gravel placed on one side of the pre-emergence pond effectively disperses and dissipates the kinetic energy of the rainwater, preventing the water flow from eroding the soil and plants, and reducing erosion and scouring damage. Simultaneously, the sedimentation gravel at the bottom of the pre-emergence pond further slows the water flow, promotes the sedimentation of solid impurities such as silt and leaves, and improves the initial purification effect of the rainwater.

[0016] 2. This utility model's rain garden connects to an external water body via a connecting pipe and utilizes a one-way valve, a first overflow pipe, a second overflow pipe, and a bypass pipe (with a solenoid valve) to achieve bidirectional automatic water flow regulation. When the water level in the rain garden is too high, water is discharged into the external water body through the second overflow pipe and the connecting pipe; when the water level is too low, the controller opens the solenoid valve based on the level sensor signal, replenishing water from the external water body through the bypass pipe. This design ensures that the rain garden always maintains a certain thickness of water storage layer, preventing plants from dying due to lack of water and also preventing waterlogging, thus improving the system's adaptability and reliability.

[0017] 3. The water-blocking plate and covering gravel in the buffer zone of this utility model can further reduce the water flow velocity, consume kinetic energy, prevent soil erosion, and work synergistically with the waterfront vegetation buffer zone to enhance the rainwater purification effect and remove pollutants.

[0018] 4. This utility model has a simple structure and is easy to construct. It uses common materials such as PE pipes, gravel, and concrete, which are easy to manufacture and install, reducing construction costs and maintenance difficulties. It has high practical value and promotion prospects. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Detail drawing of point A in the image; Figure 3 for Figure 2 Top view; Figure 4 for Figure 1 The detailed drawing at point B in the image.

[0020] Attached diagram labels: 1. Rainwater pipe; 2. Pre-flush pond; 3. Energy-dissipating gravel; 4. Sedimentation gravel; 5. Water barrier; 6. Covering gravel; 7. Waterfront vegetation buffer zone; 8. Planting soil layer; 9. Rain garden; 10. Second overflow outlet; 11. Connecting pipe; 12. Flap valve; 13. Outlet; 14. Lake; 15. Bypass pipe; 16. Solenoid valve; 17. First overflow outlet. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] like Figure 1 As shown, this utility model provides a two-way water flow regulating rain garden, including a rain garden 9 and a pre-pond 2. A rainwater pipe 1 is buried on one side of the pre-pond 2 for connecting to the municipal water supply network. The pre-pond 2 and the rain garden 9 are connected by an overflow. A horizontally arranged connecting pipe 11 is buried on one side of the rain garden 9 for connecting the rain garden 9 to an external water body. When the water level in the rain garden 9 is high, water in the rain garden 9 can flow into the external water body through the connecting pipe 11. When the water level in the rain garden 9 is low, water from the external water body can flow into the rain garden 9 through the connecting pipe 11. The connecting pipe 11 is made of PE pipe.

[0023] Understandably, by setting up a pre-pond 2, which is connected to the rain garden 9 via an overflow, the pre-pond 2 acts as a buffer when rainwater flows into the rain garden 9, preventing the water flow from impacting the rain garden 9. Connecting the rain garden 9 to an external water body via a connecting pipe 11 creates a rain garden 9 with bidirectional water flow regulation. When the water level in the rain garden 9 is high, water from the rain garden 9 can flow into the external water body through the connecting pipe 11; when the water level in the rain garden 9 is low, water from the external water body can flow into the rain garden 9 through the connecting pipe 11, ensuring that the rain garden 9 always maintains a certain thickness of water storage layer.

[0024] like Figure 1 As shown, energy-dissipating gravel 3 is fixedly installed on one side of the pre-treatment pond 2, near the outlet of the rainwater pipe 1. The outlet of the rainwater pipe 1 is the end from which rainwater flows into the pre-treatment pond 2. A concrete reinforcement layer is installed on one side of the pre-treatment pond 2, and the energy-dissipating gravel 3 is integrated with the concrete reinforcement layer. The main function of the energy-dissipating gravel 3 is to dissipate and disperse the energy of the water flow, preventing the water flow from directly eroding the soil and aquatic plants, causing erosion and scouring damage. While dispersing the water flow, the energy-dissipating gravel 3 can also consume the kinetic energy of the rainwater. By utilizing the friction and collision of the gravel particles, the kinetic energy of the water flow is consumed, allowing it to flow smoothly and slowly into the pre-treatment pond 2 for infiltration. The energy-dissipating gravel 3 is made of crushed stone or pebbles with a particle diameter of 50-150mm.

[0025] The bottom of the pre-filter pond 2 is equipped with sedimentation gravel 4. The sedimentation gravel 4 is used to slow down the water flow and allow solid matter such as silt, leaves, and particulate pollutants carried by rainwater to settle here. The sedimentation gravel 44 is made of crushed stone with a particle diameter of 20-50mm to promote particle adhesion and sedimentation. The pre-filter pond 22 can temporarily store water and basically settle solid impurities.

[0026] like Figure 1 As shown, a buffer zone is set between the pre-pond 2 and the rain garden 9. The buffer zone includes a water-blocking plate 5 between the pre-pond 2 and the rain garden 9. The water-blocking plate 5 is fixed to the edge of the pre-pond 2 by a concrete pad, forming a structure similar to an overflow weir. A gravel cover 6 is laid on the side of the water-blocking plate 5 closest to the rain garden 9. The gravel cover 6 is 5-8cm thick and is made of crushed stone with particles of 10-20mm. The height of the gravel cover 6 is higher than that of the water-blocking plate 5.

[0027] Rain Garden 9 is planted with a waterfront vegetation buffer zone 7 on the side near the front pond 2. The waterfront vegetation buffer zone 7 includes perennial water-tolerant herbaceous plants. The perennial water-tolerant herbaceous plants are selected from those that can survive being soaked in water for 48 hours and are flood-resistant, including but not limited to water-tolerant trees such as slash pine, dawn redwood, pond cypress, bald cypress, and weeping willow, as well as root plants such as reed, arundo donax, cattail, fine-leaved sand grass, and vetiver grass, and flood-resistant and drought-resistant plants such as Dichondra repens, variegated miscanthus, fine-leaved miscanthus, calamus, and umbrella sedge.

[0028] Understandably, after initial sedimentation in the pre-treatment pond 2, rainwater flows through the water-blocking plate 5 and over the covered gravel 6, overflowing into the rain garden area 9. The covered gravel 6 can significantly reduce the water flow velocity, consume its kinetic energy, effectively prevent water flow from eroding the planting soil layer 8 of the riparian vegetation buffer zone 7, avoid soil erosion and the formation of gullies, and further eliminate solid impurities in the rainwater.

[0029] like Figure 4 As shown, a one-way valve and a first overflow pipe are installed at the end of the connecting pipe 11 closest to the external water body. An outlet 13 is located at the same end of the connecting pipe 11. The one-way valve, a flap valve 12, allows water from the rain garden 9 to flow into the external water body only. The first overflow pipe is located near the one-way valve and is perpendicular to the connecting pipe 11, with a first overflow port 17 at its top. The flap valve 12 is made of cast iron and has the same diameter as the connecting pipe 11. Its weight enables automatic closure, effectively preventing backflow.

[0030] like Figure 2 , 3As shown, a second overflow pipe and a bypass pipe 15 are installed at one end of the connecting pipe 11 near the rain garden 9. The second overflow pipe is arranged vertically upward to the connecting pipe 11, and a second overflow port 10 is installed at the top of the second overflow pipe. The bypass pipe 15 is lower than the connecting pipe 11, and one end of the bypass pipe 15 extends into the rain garden 9. A solenoid valve 16 is installed inside the bypass pipe 15.

[0031] Connecting pipe 11 is arranged at the design water level of rain garden 9, bypass pipe 15 is arranged at the lowest water level of rain garden 9, and second overflow outlet 10 is arranged at the highest water level of rain garden 9.

[0032] A liquid level sensor is installed in the rain garden 9 to monitor the liquid level in the rain garden 9. The opening and closing of the solenoid valve 16 can be controlled by the controller, which controls the opening and closing of the solenoid valve 16 according to the liquid level in the rain garden 9.

[0033] Understandably, when the water level in the rain garden 9 is higher than the maximum water level, the water flows through the second overflow outlet 10 and the connecting pipe 11 to the flap gate 12, and is discharged into the external water body (lake 14 or channel). When the water level in the rain garden 9 is lower than the minimum water level, the controller controls the solenoid valve 16 on the bypass pipe 15 to open automatically. Water from the external water body flows through the first overflow outlet 17 and the connecting pipe 11, and then through the bypass pipe 15 to replenish the rain garden 9, ensuring that the rain garden 9 has a certain amount of water for a long time, and preventing the plants from turning yellow, wilting, or even dying due to insufficient water.

[0034] When the external water body is lake 14, the height of the first overflow outlet 17 should be lower than the normal water level of lake 14.

[0035] This invention utilizes the water level difference created by different terrain features, combined with a solenoid valve 16 to regulate the direction of rainwater flow. The water levels of the rain garden 9 and the surrounding water bodies complement each other, ensuring that the rain garden 9 maintains a certain thickness of water storage layer during periods of abundant or insufficient rainfall. The pre-treatment pond 2 ensures that rainwater runoff flowing into the rain garden 9 is concentrated, settled, and purified in the pre-treatment area. Through reasonable plant configuration, the rain garden 9 provides a good habitat for insects and birds, thus constructing a habitat system for the rain garden 9. Compared with existing rain gardens 9, this invention has more efficient rainwater purification, enhances biodiversity, and beautifies the environment. Furthermore, it is simple and convenient to construct, possessing considerable practical value.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A rain garden with bidirectional water flow regulation, characterized in that: The system includes a rain garden (9) and a pre-flush pond (2). A rainwater pipe (1) is buried on one side of the pre-flush pond (2) for connecting to the municipal water supply network. The pre-flush pond (2) and the rain garden (9) are connected by an overflow. A buffer zone is set between the pre-flush pond (2) and the rain garden (9). A horizontally arranged connecting pipe (11) is buried on one side of the rain garden (9) for connecting the rain garden (9) to an external water body. A one-way valve and a first overflow pipe are set at the end of the connecting pipe (11) closest to the external water body. The one-way valve only allows rainwater to flow through the rain garden. Water in the garden (9) flows into the outside water body. The first overflow pipe is arranged vertically upward to the connecting pipe (11). The top of the first overflow pipe is provided with a first overflow port (17). The end of the connecting pipe (11) near the rain garden (9) is provided with a second overflow pipe and a bypass pipe (15). The second overflow pipe is arranged vertically upward to the connecting pipe (11). The top of the second overflow pipe is provided with a second overflow port (10). The bypass pipe (15) is lower than the connecting pipe (11). One end of the bypass pipe (15) extends into the rain garden (9). A solenoid valve (16) is provided inside the bypass pipe (15).

2. The bidirectional water flow regulating rain garden according to claim 1, characterized in that: The connecting pipe (11) has an outlet (13) at one end near the external water body, and the one-way valve includes a flap valve (12), which is located at the outlet (13).

3. The bidirectional water flow regulating rain garden according to claim 1, characterized in that: A liquid level sensor is installed in the rain garden (9) to monitor the liquid level in the rain garden (9) and thereby control the opening and closing of the solenoid valve (16).

4. The bidirectional water flow regulating rain garden according to claim 1, characterized in that: The external water body includes a lake (14), and the height of the first overflow outlet (17) is lower than the normal water level of the lake (14).

5. The bidirectional water flow regulating rain garden according to any one of claims 1 to 4, characterized in that: The rain garden (9) has a waterfront vegetation buffer zone (7) planted on the side near the front pond (2), which includes perennial water-tolerant herbaceous plants.

6. The bidirectional water flow regulating rain garden according to any one of claims 1 to 4, characterized in that: A water-blocking plate (5) is provided between the pre-pond (2) and the rain garden (9), and gravel (6) is provided on the side of the water-blocking plate (5) near the rain garden (9).

7. The bidirectional water flow regulating rain garden according to claim 6, characterized in that: The height of the covering gravel (6) is higher than that of the water-blocking plate (5).

8. The bidirectional water flow regulating rain garden according to any one of claims 1 to 4, characterized in that: Energy-dissipating gravel (3) is fixedly installed on one side of the pre-water pond (2), and the energy-dissipating gravel (3) is arranged near the outlet of the rainwater pipe (1).

9. The bidirectional water flow regulating rain garden according to claim 8, characterized in that: A concrete reinforcement layer is provided on one side of the pre-pond (2), and the energy-dissipating gravel (3) is integrated with the concrete reinforcement layer.

10. The bidirectional water flow regulating rain garden according to any one of claims 1 to 4, characterized in that: The bottom of the pre-pond (2) is provided with sedimentary gravel (4).

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