Rainwater infiltration retention circulation system

Abstract

To provide a rainwater infiltration retention circulation system that prioritizes infiltrating rainwater into the ground for recharge, retains the excess portion that cannot be completely infiltrated, and can circulate the retained water in a form close to nature while utilizing it.SOLUTION: A rainwater infiltration retention circulation system has: a plurality of infiltration chambers buried so that rainwater fell on areas within a site where infiltration is difficult flows into them; infiltration drainage pipes arranged to connect one of the infiltration chambers to other adjacent infiltration chambers one after another; and a water storage tank that purifies the rainwater that has reached a terminal end of the connected infiltration drainage pipes and then stores it, wherein the infiltration chambers prioritize infiltrating a part of the rainwater into soil within the site, and the infiltration drainage pipes cause the rainwater that cannot completely infiltrate into the soil to flow out toward the water storage tank while leaking the rainwater that has flowed in from the infiltration chambers.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rainwater infiltration, storage and circulation system that effectively utilizes rainwater by infiltrating, storing and circulating it. [Background technology]

[0002] As global warming progresses due to greenhouse gases such as carbon dioxide, it is causing effects such as rising sea levels, localized changes in precipitation, frequent occurrence of abnormal weather such as large-scale natural disasters, increasing desertification, linear rain bands and sudden heavy rains. The Paris Agreement, adopted at the 21st Conference of the Parties to the United Nations Framework Convention on Climate Change (COP21), also set targets for reducing greenhouse gas emissions, calling for businesses and ordinary households to reconsider their energy usage and consumption behavior.

[0003] The United Nations General Assembly has also adopted 17 development goals as Sustainable Development Goals (SDGs), including taking urgent measures to mitigate climate change and its impacts. Corporate social responsibility (CSR) also requires companies to take an ethical stance and make voluntary contributions to society through their business activities, and many companies are working to achieve these goals. They are also working on business continuity plans (BCPs) to minimize damage in the event of an emergency such as a disaster, continue operations, and work together with the surrounding community to recover.

[0004] In order to optimize the circulation of water resources in response to recent climate change, etc., it has been stipulated that rainwater utilization will play a role, and that by promoting the effective use of water resources, concentrated runoff into sewers, rivers, etc. will be suppressed. Rainwater utilization requires that it be temporarily stored and expanded for other uses such as flush toilets and watering, but the provisions of Article 3, Paragraph 8 of the Water Supply Act (Act No. 77 of 1957), the Land Improvement Act (Agricultural Water), the Industrial Water Business Act, etc. restrict its use as raw water.

[0005] Rainwater that falls on the ground when atmospheric vapor turns into clouds seeps through the surface and is stored as groundwater, which is used for industrial purposes, rice paddies, etc. Even in areas where the rainwater environment is well-preserved, people pump up large amounts of groundwater under the assumption that there is an infinite supply, which leads to land subsidence and the drying up of spring-fed rivers.

[0006] In terms of water supply, the rate at which water supply and sewerage infrastructure is developed is one of the evaluation criteria for a developed country, and Japan ranks high among developed countries. On the other hand, impervious layers that make it difficult for rainwater to penetrate are expanding in residential areas and logistics infrastructure such as expressways, which is destructive to the rainwater environment.

[0007] Water disasters caused by climate change are becoming more severe every year, causing the collapse of social infrastructure and devastating damage to residential areas. The conversion of the ground surface to concrete or asphalt has lost the natural circulation of rainwater, increasing the flow rate into sewers and rivers, and contributing to the expansion of river flooding and flood damage.

[0008] As described in Patent Document 1, an invention has been disclosed for a rainwater infiltration and circulation storage tank that utilizes the underground space of an urban park to mitigate sudden floods caused by short-term heavy rainfall, and that provides a disaster prevention area where cool drinking water is constantly stored by applying the purification system of the plateau.

[0009] A rainwater infiltration and circulation storage tank buried underground comprises an infiltration tank whose floor and sides are made of permeable material, and a circulation storage tank whose floor and side walls are made of impermeable material and located inside the infiltration tank above the floor of the infiltration tank and within the height of the side of the infiltration tank. The interiors of the infiltration tank and circulation storage tank are filled with porous material, and a pumping means is provided to discharge water from the circulation storage tank. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent No. 4826975 Summary of the Invention [Problem to be solved by the invention]

[0011] In the invention described in Patent Document 1, there is a circulation storage tank inside the infiltration tank, and water is pumped up from the circulation storage tank using a pumping means. Rainwater in the infiltration tank that does not enter the circulation storage tank will infiltrate, but because the area of the infiltration layer is proportional to the permeability coefficient (the permeability of water is just under 2m horizontally), there is a risk that this will be insufficient to recharge groundwater and will also be insufficient to store it.

[0012] Therefore, the present invention aims to provide a rainwater infiltration, storage, and circulation system that first prioritizes infiltrating rainwater into the ground and recharging it, then stores the excess water that does not infiltrate completely, and uses the stored water to circulate it in a manner close to nature. [Means for solving the problem]

[0013] In order to solve the above problems, the rainwater infiltration storage and circulation system of the present invention comprises a plurality of buried infiltration tanks so that rainwater that falls in areas of the site where infiltration is difficult flows into them, infiltration drainage pipes arranged to connect one of the infiltration tanks to another adjacent infiltration tank, and a water storage tank that purifies and stores the rainwater that reaches the end of the connected infiltration drainage pipes, wherein the infiltration tanks prioritize allowing some of the rainwater to infiltrate into the soil on the site, and the infiltration drainage pipes allow the rainwater that flows in from the infiltration tanks to leak out, while directing the rainwater that does not completely infiltrate into the soil toward the water storage tank.

[0014] In the rainwater infiltration storage and circulation system, the infiltration drainage pipe is a porous ceramic pipe, and when multiple ceramic pipes are connected, a portion of the rainwater is allowed to infiltrate into the soil through the gaps.

[0015] The rainwater infiltration, storage, and circulation system is characterized by having an infiltration layer for forcibly releasing the rainwater stored in the water storage tank onto the premises periodically.

[0016] The rainwater infiltration, storage and circulation system is characterized in that a water garden is formed on the premises to temporarily store the rainwater and allow it to evaporate.

[0017] The rainwater infiltration storage and circulation system is characterized by having a circulation means for supplying the rainwater from the infiltration layer to the water basin and for supplying the rainwater from the water basin to the infiltration layer.

[0018] In addition, the rainwater infiltration storage and circulation method involves installing infiltration drainage pipes to connect each of multiple buried infiltration tanks to adjacent infiltration tanks so that rainwater that falls in areas of the site where infiltration is difficult flows into them, and purifying the rainwater that reaches the end of the connected infiltration drainage pipes before storing it in a water storage tank.The method is characterized by giving priority to allowing some of the rainwater from the infiltration tank to infiltrate into the soil on the site, allowing the rainwater that flows from the infiltration tank into the infiltration drainage pipe to leak, while allowing the rainwater that does not completely infiltrate into the soil to flow toward the water storage tank, and periodically forcibly releasing the rainwater from the water storage tank onto the site. [Effects of the Invention]

[0019] According to this invention, by prioritizing the infiltration and recharge of rainwater into the ground and storing the excess water that does not infiltrate, it is possible to create a small dam based on the natural water environment in each household. By using rainwater for toilet flushing and sprinkling, which does not require the same water quality as tap water, it can be used as an alternative water source in emergencies such as disasters, and water conservation can be expected even during normal times.

[0020] By allowing rainwater that does not soak into paved surfaces to soak into the soil where it falls, rather than discharging it into the sewer, it is possible to prevent accumulation in sewers and rivers and the depletion of groundwater, leading to environmental conservation. The stored water can be used for domestic purposes, and by repeatedly collecting and purifying it, water and sewerage costs can be reduced. By evaporating water in garden ponds or through watering, it can be circulated in a way that is closer to nature, and by suppressing temperature increases through watering, the frequency of air conditioning use can be reduced, resulting in energy savings.

[0021] By circulating water, it is possible to avoid unsanitary conditions when using it. Even if the water supply is cut off due to a disaster or if there is a shortage of water in the water storage tank, it is possible to pump up water from groundwater because it prioritizes percolation into the soil. As global warming and changes in land use are also contributing to climate change, restoring the water cycle to a more natural state will also help mitigate the impact of climate change.

[0022] Maintaining the natural environment is a way to coexist with nature without destroying it, and contributes to a sustainable society. It not only combats climate change, but also brings various added value, such as promoting health and welfare, water sanitation management, sustainable energy, infrastructure construction, living environment, and production and consumption patterns. Even if water is available in underground drains, creating a water garden on the premises improves the landscape and provides peace of mind that there will be no water shortages. Such visual appeal adds value not only in emergencies but also in normal times. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a plan view showing an example of a site where the rainwater infiltration storage and circulation system of the present invention has been installed. [Figure 2] 1 is a cross-sectional view of a portion of a site where a rainwater infiltration storage and circulation system according to the present invention has been installed, viewed from the side. [Figure 3] 1 is a schematic diagram showing the flow of rainwater in the rainwater infiltration storage and circulation system of the present invention. FIG. [Figure 4] FIG. 1 is a plan view showing an example of circulating rainwater stored in a rainwater infiltration, storage, and circulation system according to the present invention. [Figure 5] 1 is a front cross-sectional view showing an example of circulating rainwater stored in a rainwater infiltration storage and circulation system according to the present invention. FIG. [Figure 6] FIG. 1 is a cross-sectional side view showing an example of circulating rainwater stored in a rainwater infiltration, storage, and circulation system according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that components having the same functions will be assigned the same reference numerals, and repeated description thereof may be omitted. [Example]

[0025] First, we will explain the rainwater infiltration storage and circulation system of the present invention. Figure 1 is a plan view showing an example of a site where a rainwater infiltration storage and circulation system has been installed. Figure 2 is (a) a cross-sectional view of a part of the site where a rainwater infiltration storage and circulation system has been installed, as seen from the side, and (b) a diagram showing an infiltration tank and (c) an infiltration drainage pipe. Figure 3 is (a) a schematic diagram showing the flow of rainwater in the rainwater infiltration storage and circulation system, and (b) a diagram showing a water tank and (c) an example of use.

[0026] As shown in Figures 1 to 3, the rainwater infiltration storage and circulation system 100 includes multiple buried infiltration tanks 300 to allow rainwater 110 that falls in areas of the site 200 that are difficult to infiltrate to flow into them, infiltration drainage pipes 400 that are arranged to connect each infiltration tank 300 to adjacent infiltration tanks 300a, and a water storage tank 510 that purifies and stores the rainwater 110 that reaches the end 400a of the connected infiltration drainage pipes 400.

[0027] In addition, in the rainwater infiltration storage and circulation system 100, the infiltration tank 300 prioritizes infiltrating a portion of the rainwater 110 into the soil 120 within the site 200, and the infiltration drainage pipe 400 allows the rainwater 110 that flows in from the infiltration tank 300 to leak out, while directing the rainwater 110 that does not completely infiltrate into the soil 120 toward the water storage tank 510.

[0028] The site 200 on which the rainwater infiltration storage and circulation system 100 has been installed is separated by a boundary 250 such as a fence, and entrances 210 allow people to enter the site 200 from the outside and exit from the site 200 to the outside. The site 200 may include an area where a building 220 has been built, a paved surface 230 where the ground has been paved, and a green space 240 where plants (such as grass) grow on the soil 120.

[0029] Furthermore, rainwater 110 that falls inside the boundary 250 and the entrance / exit 210 enters the site 200, and rainwater 110 does not flow out from the site 200 to the outside, and rainwater 110 does not flow into the site 200 from the outside. Outside rainwater 110 flows into rivers, drainage channels, etc.

[0030] Of the ground within the site 200, rainwater 110 easily permeates into the soil 120 in the green space 240, but rainwater 110 does not easily permeate into the paved surface 230. Note that since the paved surface 230 is mainly a passageway for vehicles, etc., areas where wheels do not pass may be designated as green space 240a. Other areas where rainwater 110 does not easily permeate are also treated in the same way as the paved surface 230.

[0031] Infiltration basins 300 are installed within the site 200 to allow rainwater 110 on the pavement surface 230 to infiltrate into the soil 120. Multiple basins are buried around houses and paved areas with impermeable layers that are particularly difficult for rainwater 110 to infiltrate. The infiltration basins 300 are facilities for allowing rainwater 110 to infiltrate into the ground and recharge groundwater. For example, a cylindrical body with an open bottom or holes in the bottom and sides can be buried underground from the ground level and filled with crushed stone 740, broken granite stones 750, or the like. The cylindrical body may be made of resin, concrete, or the like, molded into a circular or rectangular shape, or may be wrapped in a permeable sheet.

[0032] A plurality of infiltration basins 300 are arranged in a ring, for example, surrounding a building 220 or along the boundary between a paved surface 230 and a green space 240. Each infiltration basin 300 and its adjacent infiltration basins 300a are connected by infiltration drainage pipes 400, connecting the entire area in a ring.

[0033] In order to make the rainwater 110 flow into one of the infiltration basins 300, the pavement surface 230 may be inclined so that the rainwater 110 flows from the boundary 250 of the site 200 toward the infiltration basin 300. The top surfaces of the infiltration basins 300 are connected to the ground so that the rainwater 110 flows in, and therefore the infiltration drainage pipes 400 connecting the infiltration basins 300 are culverts buried underground.

[0034] The infiltration drain pipe 400 uses a permeable ceramic pipe such as a biscuit pipe. Ceramic pipes made from natural materials are porous and have excellent permeability, water retention, and purification functions. Multiple ceramic pipes may be connected and placed between the infiltration tank 300 and the infiltration tank 300a. The infiltration drain pipes 400 only need to be loosely connected, and even if there are gaps, it is sufficient as long as large amounts of water can be sent to the adjacent infiltration drain pipe 400a. Rainwater 110 that seeps into the infiltration drain pipe 400 or leaks through the gaps will seep into the soil 120.

[0035] While some of the rainwater 110 is infiltrated, the rainwater 110 that does not completely infiltrate in the infiltration tank 300 flows out into the infiltration drain pipe 400, and the rainwater 110 that does not leak through the infiltration drain pipe 400 and its gaps is stored in the water storage tank 510 from the terminal infiltration drain pipe 400b via the purification tank 500. Note that the ends of the infiltration drain pipe 400b do not need to be connected to each other, as long as the rainwater 110 that has collected at the end is sent to the purification tank 500.

[0036] The purification tank 500 removes impurities such as garbage from the rainwater 110. Purifying materials may be placed in the underdrain drainage. For example, the impurities may be adsorbed onto activated carbon or filtered through a porous filter. The purification tank 500 may have a triple-layered filter with activated carbon sandwiched between ceramics. The supernatant liquid obtained by reverse osmosis of the collected impurity-containing rainwater 110 may be sent to the water storage tank 510.

[0037] The water storage tank 510 stores rainwater 110 that has been treated in the purification tank 500. The water quality does not need to be as good as tap water that can be used as drinking water, as long as it has been purified to a degree that it can be used for daily life such as bathing and using the toilet. In the event of an emergency such as a disaster, the water can be sterilized to a quality similar to that of tap water and can be used.

[0038] Even in water storage facilities, exposure to sunlight can cause the growth of algae and other growths, making the environment unsanitary, so it is preferable to shield the water storage tank 510 from sunlight or bury it underground. Also, if rainwater 110 is left containing organic matter, the water will rot, so it is preferable to circulate it periodically and purify it.

[0039] As shown in Figure 2, rainwater 110 that falls on a paved surface 230 within a site 200 flows toward an infiltration tank 300 due to the slope of the paved surface 230. The rainwater 110 that collects in the infiltration tank 300 first infiltrates from the infiltration tank 300 into the soil 120, and any excess water that does not infiltrate flows into an infiltration drainage pipe 400.

[0040] Rainwater 110 seeps into the soil 120 through gaps in the infiltration drainage pipe 400, but any that does not seep in is collected in the purification tank 500, purified, and stored in the water storage tank 510. The water storage tank 510 is equipped with a water supply means 520, which pumps the water up to the ground and uses it for daily life, etc. The water then evaporates or seeps into the ground, circulating.

[0041] As shown in Figure 3, if a permeation drainage pipe 400 is connected from a high position of the permeation tank 300 to a low position of the permeation tank 300a, the excess rainwater 110 that does not permeate will flow along the permeation drainage pipe 400. The rainwater 110a that permeates into the ground from the permeation tank 300 and the permeation drainage pipe 400 is recharged as groundwater, and can be pumped up from a well or the like.

[0042] Rainwater 110 stored in water storage tank 510 is supplied by water supply means 520 to water storage tank 600, water garden 610, permeation layer 700, etc., installed within site 200. By storing rainwater 110, it is possible to reduce the use of water from outside, and water can be used even if it becomes difficult to supply water from outside.

[0043] In this way, a dam is formed within the site 200 from rainwater 110 that has been recharged as groundwater in the soil 120 within the site 200 and the surplus rainwater 110 that has been stored in the water storage tank 510, making the rainwater 110 available for use as needed. In addition to the water storage tank 510, the water storage tank 600 and the site 200 itself, which is surrounded by a wall, can also store water to the extent that the building 220 will not be flooded.

[0044] Additionally, even underground, if an impermeable sheet or the like is laid along the boundary 250, it will be difficult for groundwater to flow into or out of the site 200. Areas where it is desired for rainwater 110 to infiltrate may be separated from areas where it is not desired for rainwater 110 to infiltrate. [Example]

[0045] As shown in Fig. 1, in order to utilize rainwater 110 stored in a water storage tank 510, a water tank 600, a water garden 610, a permeation layer 700, etc. are provided within the site 200. For example, the rainwater 110 is used and circulated in ways such as sprinkling water to evaporate into the atmosphere, improving the appearance of the landscape of the site 200, or permeating the soil 120 within the site 200 to recharge groundwater.

[0046] Rainwater 110 is pumped up from the water storage tank 510 by a water supply means 520 and used for domestic water and other purposes. Water that is difficult to reuse, such as toilet water, is discharged into the sewer system, but water that can be reused, such as for watering the site 200, is circulated in the same way as rainwater 110. For example, water can be sprinkled from the roof of the building 220 to prevent the temperature from rising, but it may also be possible to use a grass roof.

[0047] By filling the water tank 600 and water yard 610 installed within the site 200 with water, it is possible to suppress temperature rises in the summer and use the water for discharging water in the event of a fire. The water tank 600 includes not only a structure dug into the ground and constructed with concrete or the like to store water, but also facilities and equipment for storing water in a tank. It may also be a pool or a regulating pond. Rainwater 110 can also be temporarily stored to allow evaporation.

[0048] The water garden 610 is a water garden (pond garden) with water features such as a small pond, waterfall, and fountain. To prevent water from the water tank 600 or the like from flowing toward the building 220, a small puddle-like structure is formed at the boundary between the side of the ground that can be submerged in water and the side that should not be submerged, and a moderate amount of water is left there. Even if the water from the water tank 600 or the like overflows, if it is only a small amount, it can be caught in the water garden 610.

[0049] The permeation layer 700 is a location where the soil 120 is exposed, such as the green space 240 where the rainwater 110 can easily permeate within the site 200, and includes locations where the permeation tank 300 and the permeation drainage pipe 400 are placed. The entire area except for locations where the rainwater 110 has difficulty permeating, such as the building 220 and the pavement surface 230, may be made into the permeation layer 700.

[0050] If water remains in the water tank 600 and heavy rain is expected, the water in the water tank 600 may be forcibly discharged into the permeable layer 700. Even if water overflows from the water tank 600 and the water garden 610, it is possible to prevent the water from flowing outside through a fence or other structure built on the boundary 250 of the site 200. The boundary 250 and the entrance / exit 210 are higher than the interior of the site 200, and any water that exceeds the entrance / exit 210 will flow into a drainage channel or river. To respond to disaster-level situations such as sudden downpours or linear rain bands, a regulating pond may be formed in conjunction with the waterfall, pond, and water garden, capable of storing 100 mm of rainwater per hour.

[0051] Fig. 4 is a plan view showing an example of circulating stored rainwater in a rainwater infiltration storage and circulation system. Fig. 5 is a cross-sectional view taken along line AA of an example of circulating stored rainwater from the front side. Fig. 6 is a cross-sectional view taken along line BB of an example of circulating stored rainwater from the side.

[0052] As shown in Figures 4 to 6, rainwater 110 stored in a water storage tank 510 is pumped up by a water supply means 520 periodically or at any time, and is used, for example, for watering or fountains, and then drained into a permeable layer 700 or the like within the site 200.

[0053] The infiltration layer 700 is an area created to allow rainwater 110 to infiltrate into the ground, for example, by laying broken granite stones 750 and crushed stone 740 inside an infiltration sheet 730 laid along a hole dug in the ground on the site 200, and then covering it with soil 120. It stores groundwater in a form close to nature, and may be created over a large area on the site 200, or multiple small ones.

[0054] Crushed stone 740 can be prepared by first laying relatively large stones (approximately 15 cm in diameter) such as broken gris 750 near the bottom of the infiltration layer 700 with gaps between them, and then gradually laying smaller blocks of stone (crushed to approximately 10 mm) on top of them so that the gaps become smaller. The soil 120 above the crushed stone 740 only needs to ensure water infiltration, so it can be used to plant grass, trees, flower beds, etc.

[0055] For example, rocks or the like can be placed near the permeation layer 700, and rainwater 110 pumped up from the water storage tank 510 can be made to flow from the top of the rocks to create a waterfall, or a water garden with a fountain or the like can be formed, and the flowing rainwater 110 can be collected in a pond or the like, and then allowed to soak into the permeation layer 700. Note that a circulation system in which rainwater is pumped up from the permeation layer 700 and supplied to the permeation layer 700 can also be used.

[0056] The depth of the permeation layer 700 is preferably set to match the position of the underground aquifer 130. Water that permeates the permeation layer 700 passes through the permeation sheet 730 and is supplied to the aquifer 130 as groundwater, and groundwater from the aquifer 130 passes through the permeation sheet 730 and permeates into the permeation layer 700.

[0057] Underground pipes 710 and recharge pipes 720 are installed in the permeation layer 700. They serve as a circulation means for supplying rainwater 110 from the permeation layer 700 to the water yard 610, and also for supplying rainwater 110 from the water yard 610 to the permeation layer 700. The underground pipes 710 extend to near the bottom of the permeation layer 700, which is filled with crushed stone 740 and broken granite 750 and where the aquifer 130 is located, and pump groundwater up to the surface. The pumped water can be supplied to flow as a waterfall.

[0058] The recharge pipe 720 extends to the crushed stone 740 or broken stone 750 in the permeation layer 700, and supplies ground water from the permeation layer 700 to the aquifer 130. The water flowing as a waterfall can be forcibly sent to the crushed stone 740 or broken stone 750. The pipe may also be connected to the permeation tank 300, or a pipe may extend from the permeation tank 300.

[0059] Direct rainwater 110 and water supplied from the water storage tank 510 permeate into the permeation layer 700, and groundwater pumped up from the permeation layer 700 is utilized, evaporating, being discharged outside the site 200, or permeating back into the permeation layer 700, thereby forming a global or local water circulation cycle. Inside a boundary 250 such as a fence that separates the site 200, the ground may be sloped so that the water around the permeation layer 700 flows toward the permeation layer 700.

[0060] In addition, a pump can be installed to pump up groundwater to prevent the water from spoiling. The power source for the pump can be solar power or other sources. Furthermore, the pumped water can be made to flow from a high point such as a waterfall, and then collected by a water wheel to generate hydroelectric power. This electricity can be stored and used to power the pump and other equipment while circulating the water. [Example]

[0061] The rainwater infiltration, storage, and circulation system may be controlled by a computer. The computer has a means for acquiring the amount of rainwater stored in the water storage tank, a means for instructing the water storage tank to release rainwater onto the premises when the amount of rainwater exceeds a preset upper limit until it reaches a preset lower limit, and a means for transmitting the amount of rainwater to a terminal via the Internet, and executes a process for adjusting the amount of stored water in accordance with the rainwater infiltration, storage, and circulation method.

[0062] In addition, sensors that can detect water volume can be installed to understand the status of the water tank, and weather information can be acquired, and if heavy rain is predicted, the water in the water tank can be forcibly discharged into the permeable layer or the amount of groundwater being recharged can be monitored. The collected information can be stored in a database on a server, and the degree of dryness of the soil can be checked on a terminal.

[0063] The rainwater infiltration storage and circulation method involves installing multiple infiltration tanks so that rainwater that falls in areas of the site that are difficult to infiltrate flows into, and installing infiltration drainage pipes to connect each of these to adjacent infiltration tanks in succession. The rainwater that reaches the end of the connected infiltration drainage pipes is purified and then stored in a water storage tank. Priority is given to allowing some of the rainwater from the infiltration tank to infiltrate into the soil on the site, and while the rainwater that flows from the infiltration tank into the infiltration drainage pipes leaks, the rainwater that does not infiltrate into the soil flows into the water storage tank, and the water is circulated by periodically releasing the rainwater from the water storage tank onto the site.

[0064] According to this invention, by prioritizing the infiltration and recharge of rainwater into the ground and storing the excess water that does not infiltrate, it is possible to create a small dam based on the natural water environment in each household. By using rainwater for toilet flushing and sprinkling, which does not require the same water quality as tap water, it can be used as an alternative water source in emergencies such as disasters, and water conservation can be expected even during normal times.

[0065] By allowing rainwater that does not soak into paved surfaces to soak into the soil where it falls, rather than discharging it into the sewer, it is possible to prevent accumulation in sewers and rivers and the depletion of groundwater, leading to environmental conservation. The stored water can be used for domestic purposes, and by repeatedly collecting and purifying it, water and sewerage costs can be reduced. By evaporating water in garden ponds or through watering, it can be circulated in a way that is closer to nature, and by suppressing temperature increases through watering, the frequency of air conditioning use can be reduced, resulting in energy savings.

[0066] By circulating water, it is possible to avoid unsanitary conditions when using it. Even if the water supply is cut off due to a disaster or if there is a shortage of water in the water storage tank, it is possible to pump up water from groundwater because it prioritizes percolation into the soil. As global warming and changes in land use are also contributing to climate change, restoring the water cycle to a more natural state will also help mitigate the impact of climate change.

[0067] Maintaining the natural environment is a way to coexist with nature without destroying it, and contributes to a sustainable society. It not only combats climate change, but also brings various added value, such as promoting health and welfare, water sanitation management, sustainable energy, infrastructure construction, living environment, and production and consumption patterns. Even if water is available in underground drains, creating a water garden on the premises improves the landscape and provides peace of mind that there will be no water shortages. Such visual appeal adds value not only in emergencies but also in normal times.

[0068] Although the embodiments of the present invention have been described above, the present invention is not limited to these. For example, a computer system may be cloud-based, or accumulated information may be analyzed as big data using AI. [Explanation of symbols]

[0069] 100: Rainwater infiltration and storage circulation system 110: Rainwater 120: Soil 130: Aquifer 200: Site 210: Entrance / exit 220: Building 230: Pavement 240: Green space 250: Boundary 300: Penetration 400: Seepage drain pipe 500: Purification tank 510: Water tank 520: Water supply means 600: Water tank 610: Water Garden 700: Penetration layer 710: Underground Pipe 720: Recharge pipe 730: Permeation sheet 740: Crushed stone 750:Broken granite

Claims

1. There are multiple buried infiltration basins to allow rainwater to flow into areas of the site where infiltration is difficult. a permeation drainage pipe arranged to connect one of the permeation tanks to another adjacent permeation tank; A water storage tank that purifies and stores the rainwater that reaches the end of the connected infiltration drainage pipe, The infiltration tank prioritizes infiltrating a portion of the rainwater into the soil on the premises, The infiltration drainage pipe allows the rainwater that has flowed in from the infiltration tank to leak out, and allows the rainwater that has not completely infiltrated into the soil to flow out toward the water storage tank. A rainwater infiltration, storage and circulation system.

2. The infiltration drainage pipe is a porous ceramic pipe, and when a plurality of ceramic pipes are connected, a portion of the rainwater is infiltrated into the soil through gaps. The rainwater infiltration storage and circulation system according to claim 1.

3. A permeation layer is provided for forcibly releasing the rainwater stored in the water storage tank onto the premises periodically.

2. The rainwater infiltration storage and circulation system according to claim 1.

4. A water garden is formed on the premises to temporarily store the rainwater and allow it to evaporate. The rainwater infiltration storage and circulation system according to claim 3.

5. a circulation means for supplying the rainwater from the permeation layer to the water basin and for supplying the rainwater from the water basin to the permeation layer; The rainwater infiltration storage and circulation system according to claim 4.

6. A method in which a plurality of infiltration tanks are buried so that rainwater that falls in places on the site where infiltration is difficult flows into, and infiltration drainage pipes are arranged so as to connect each of the infiltration tanks to adjacent infiltration tanks one after another, and the rainwater that reaches the end of the connected infiltration drainage pipes is purified and stored in a water storage tank, Prioritizing the infiltration of a portion of the rainwater from the infiltration tank into the soil on the premises, allowing the rainwater that has flowed from the infiltration tank into the infiltration drainage pipe to leak while allowing the rainwater that has not completely infiltrated into the soil to flow toward the water storage tank, and periodically forcibly releasing the rainwater from the water storage tank onto the premises. A rainwater infiltration, storage and circulation method characterized by the above.

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