CN109944312B - Floating decanting type ecological rainwater storage tank for sponge city construction - Google Patents
Floating decanting type ecological rainwater storage tank for sponge city construction Download PDFInfo
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Abstract
The invention discloses a floating decanting type ecological rainwater storage tank for sponge city construction, which comprises an ecological rainwater storage tank main body, a floating decanting outflow system, a flood discharge and drainage system and an air pressure backwashing system, wherein the floating decanting outflow system is connected with the ecological rainwater storage tank main body; the ecological rainwater storage tank main body is used for receiving urban rainwater runoff and purifying pollutants in the collected rainwater runoff through ecological regulation; the floating type decanting outflow system is used for decanting the upper layer clean water purified by the ecological rainwater storage tank main body, the decanted water flows to a sand filtering ditch outside a water outlet through the water outlet, the collected water is filtered again through the sand filtering ditch and then is collected into a low-level clean water tank for reuse, and the clean water tank is connected with a pneumatic backwashing system; the invention ensures the quality of the reuse water of the rainwater and the back washing of the whole system, realizes the purpose of automatic adjustment, reduces the cost of manpower operation and has good social and economic benefits.
Description
Technical Field
The invention relates to the technical field of sponge city construction and rainwater resource utilization, in particular to a floating decanting ecological rainwater storage tank for sponge city construction.
Background
In recent years, cities in China have frequent inland inundation, and the cities have a demand for rapid drainage in rainy seasons, but when heavy rainfall occurs, particularly hundreds of years of heavy rain, the original municipal rainwater pipe network cannot meet the demand for rapid drainage, so that the pressure borne by the pipe network is continuously increased, and the problem of inland inundation of the cities is solved on the basis of how to rapidly and not influencing the original pipe network, and the urban inland inundation becomes a focus of attention at present.
Although the existing common engineering measures are that a rainwater storage tank is additionally arranged at the middle rear end of the urban rainwater pipe network to achieve the purposes of relieving the drainage pressure of the rainwater pipe network and storing rainwater for later use, the rainwater storage tank is arranged to contain rainwater and share the pressure of the rainwater pipe network to reduce the risk of urban waterlogging when the rainy season comes temporarily, and water can be released to relieve the pressure of the urban water after the rainy season passes.
Disclosure of Invention
Aiming at the technical problems, the invention provides the floating decanting ecological rainwater storage tank which can quickly and effectively purify and collect clean rainwater, is stable and reliable in operation, energy-saving and environment-friendly, good in effect and convenient to maintain and is used for sponge city construction.
The technical scheme of the invention is as follows: a floating decanting type ecological rainwater storage tank for sponge city construction comprises an ecological rainwater storage tank main body, a floating decanting outflow system, a flood discharge and drainage system and an air pressure backwashing system; an ecological flood intercepting ditch is arranged at the water inlet of the ecological rainwater storage pond main body, a rainwater pipe discharge interface is arranged at the bottom of the ecological rainwater storage pond main body, and the rainwater pipe discharge interface is connected with a municipal rainwater pipe network through a bypass pipe; the floating type decanting and outflow system comprises a slag-stopping cofferdam, an air bag, a connecting rod, a nylon filter screen, a porous overflow pipe and an outflow hose; the flood discharge and drainage system comprises a flood discharge weir and a flood passage corridor; the pneumatic backwashing system comprises a bag type pneumatic backwashing water tank and a backwashing water outlet main pipe; the slag-stopping cofferdam is arranged at a water outlet of the ecological rainwater storage tank main body, the slag-stopping cofferdam is provided with a water stop level scale, a storage water level scale and a flood discharge level scale, the rear end of the slag-stopping cofferdam is provided with a slide rail, the porous overflow pipe is provided with a slide sheet, the porous overflow pipe is movably connected with the slide rail through the slide sheet, the porous overflow pipe is provided with a decanter backwashing branch pipe, a nylon filter screen is wrapped on the porous overflow pipe, an air bag is fixedly arranged on the porous overflow pipe through a connecting rod, a water outlet hose is arranged at the lower end of the porous overflow pipe, the porous overflow pipe is connected with a sand filter ditch through a water outlet hose; the sand filtration ditch is used for intercepting and filtering the floating objects in the rainwater for the second time, the sand filtration ditch is connected with a low-level reservoir through a water collecting pipe, a first check valve and a second electric gate valve are arranged at the connection part, and a sand filtration ditch backwashing branch pipe is arranged at the bottom of the sand filtration ditch; the flood discharge weir is arranged between the floating type decanting outflow system and the sand filtering ditch, and the flood passage is arranged in the middle of the flood discharge weir; the bag type air pressure backwashing water tank is connected with the sand filtration ditch through a backwashing water outlet main pipe and a backwashing branch pipe of the sand filtration ditch, a fourth check valve and a fifth electric gate valve are arranged at the connection part, the bag type air pressure backwashing water tank is connected with the porous overflow pipe through the backwashing water outlet main pipe and the backwashing branch pipe of the decanter, a third check valve and a fourth electric gate valve are arranged at the connection part, and a liquid level sensor, a pressure sensor, an air supplement device and a safety valve are arranged on the bag type air pressure backwashing water tank; the low-level reservoir is connected with the bag-type air pressure backwashing water tank, a backwashing water inlet pump, a second check valve and a third electric gate valve are arranged at the joint, and the first electric gate valve, the second electric gate valve, the third electric gate valve, the fourth electric gate valve, the backwashing water inlet pump and the fifth electric gate valve are powered by an external power supply.
Furthermore, the regulation and storage pool also comprises a control system, the control system comprises a controller, a processor and a remote controller, the controller is connected with the first electric gate valve, the second electric gate valve, the third electric gate valve, the fourth electric gate valve, the backwashing water inlet pump and the fifth electric gate valve, the liquid level sensor and the pressure sensor are connected with the processor, and the remote controller and the processor are connected with the controller.
Furthermore, the front end of the ecological flood intercepting ditch is provided with a grass planting slope, a permeable brick-stone concrete short wall is arranged between the ecological flood intercepting ditch and the ecological rainwater storage pond main body, and the permeable brick-stone concrete short wall is arranged to enable the ecological flood intercepting ditch and the storage pond inlet to be in transition through the natural permeation and filtration pore structure of the permeable brick-stone concrete short wall.
Further, evenly be provided with a plurality of retaining walls in the ecological rainwater regulation pond main part, set up the retaining wall and can increase water course length, greatly increased the contact time of rainwater and water purification plant, can deepen biological purification effect.
Furthermore, the cross section of the sand filtering ditch is trapezoidal, the bottommost part of the sand filtering ditch is a porous concrete plate provided with a filter head, cobblestones are used as a cushion layer, quartz sand is laid on the cushion layer, the water passing amount of the sand filtering ditch is increased, and the filtering effect is improved.
Furthermore, the ecological flood intercepting ditch is mainly used for planting grass which is suitable for local environment growth and is waterlogging resistant, and the biological purification effect is improved.
Furthermore, aquatic plants are planted in the ecological rainwater storage tank main body, and the aquatic plants are reed, cattail, arrowhead and water lily from outside to inside respectively.
Furthermore, branch pipelines are arranged on the back washing water outlet main pipe and are connected with a rainwater recycling end for road cleaning, car washing, greening and the like.
The working principle of the invention is as follows: when raining, rainwater on the periphery of the ecological rainwater storage pond main body is intercepted through the grass planting slope and collected to the ecological flood intercepting ditch, and rainwater runoff on the peripheral roads is connected to a rainwater pipe discharge interface through a bypass pipe of a rainwater pipe network; when the raining time exceeds 30min, the first electric gate valve and the second electric gate valve are controlled to operate through the controller, the floating type decanting and discharging system starts to operate, upper layer clean water passing through a certain ecological purification effect at the tail end of the ecological rainwater storage tank main body is collected through the porous overflow pipe, then is collected to the water outlet through the water outlet hose, is discharged to the sand filtration ditch for secondary filtration and purification, and is stored in the low-level reservoir through the water collecting pipe after being self-retained by gravity; when the water level in the low-level reservoir reaches the pump starting water level of the backwashing water inlet pump, the controller controls the starting of the backwashing water inlet pump to lift the water in the low-level reservoir into the bag-type air pressure backwashing water tank for storage, and when the bag-type air pressure backwashing water tank reaches the full water level, the backwashing water inlet pump stops water inlet; when the water level of the ecological rainwater storage tank main body is lower than the stop water level scale of the water outlet or the water level of the low-level reservoir is higher than the gravity flow water level of the sand filter tank in the working process of the floating type decanting and flowing system, stopping water inflow of the low-level reservoir; after the rain stops, the controller controls the fourth electric gate valve and the fifth electric gate valve to be opened, the back washing water flows out of the bag type air pressure back washing water tank to start back washing, and when the water level of the back washing water in the bag type air pressure back washing water tank reaches the scale of stopping the water level, the controller controls the fourth electric gate valve and the fifth electric gate valve to be closed, and the back washing stops; under the condition of extreme rainstorm weather, when the water level of the ecological rainwater storage pond main body is higher than the height of the flood discharge weir, water is intercepted by the slag stopping cofferdam and then is discharged into a nearby water body through the flood passage over the flood discharge weir.
Compared with the prior art, the invention has the beneficial effects that:
the ecological multi-layer regulation and storage of rainwater is realized, the regulation and storage of the rainwater is more sufficient and reasonable compared with the regulation and storage of a conventional single rainwater regulation and storage system, the ecological rainwater regulation and storage pool combined with landscape construction has a biological purification function, can create a beautiful landscape environment, can also store stagnant rainwater through root systems of plants and the like, improves the sponginess of cities to the maximum extent, and realizes integration of storage, purification, use, drainage and landscape;
the rainwater purification system consists of an ecological flood interception ditch, a water purification plant ecological system and a sand filtration ditch, has low treatment cost, excellent purification effect and convenient operation and maintenance, and can greatly ensure the quality of the reclaimed rainwater;
thirdly, the retaining wall is designed in the ecological rainwater storage tank main body, so that the length of a water channel can be increased, the contact time of rainwater and water purification plants is greatly increased, and the biological purification effect can be deepened;
the floating decanting outflow system enables the decanting head to be stabilized below the liquid level for water body storage by utilizing the principle of buoyancy and gravity balance, manual adjustment is not needed when the water level changes, energy is saved, environment is protected, operation and maintenance are convenient, operation is simple and easy to implement, floating objects are prevented from entering downstream water bodies, rainwater discharged to natural water bodies is pure, and pollution to the environment is avoided;
fifthly, when the rainfall is smaller, the rainwater enters the ecological regulation and storage tank to purify and regulate, when the rainfall is larger, a part of rainwater is discharged into the flood passage gallery through the flood discharge weir to be brought into the water body, and a part of rainwater is collected and recycled through the water decanting and discharging device, so that urban inland inundation can be relieved to a great extent.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is an enlarged schematic view of the floating decant outflow system of the present invention;
FIG. 4 is a schematic view of the connection structure of the porous overflow tube and the connection rod of the present invention;
FIG. 5 is an enlarged schematic view of the pneumatic backwash system of the present invention;
FIG. 6 is a control block diagram of the present invention;
wherein, 1-an ecological rainwater storage tank main body, 10-an ecological flood intercepting ditch, 11-a rainwater pipe discharge interface, 12-a grass planting slope, 13-a permeable brick-stone concrete short wall, 14-a retaining wall, 2-a floating type decanting outflow system, 20-a slag blocking cofferdam, 21-an air bag, 22-a connecting rod, 23-a nylon filter screen, 24-a porous overflow pipe, 240-a decanter backwashing branch pipe, 25-a water outlet hose, 26-a first electric gate valve, 3-a flood discharging and drainage system, 30-a flood discharging weir, 31-a flood passing corridor, a 4-an air pressure backwashing system, 40-a bag type air pressure backwashing water tank, 41-a backwashing water outlet main pipe, 42-a second check valve, 43-a third electric gate valve, 44-a third check valve, 45-a fourth electric gate valve, 46-a liquid level sensor, 47-a pressure sensor, 48-an air supply device, 49-a safety valve, 5-a sand filtration ditch, 50-a water collecting pipe, 51-a first check valve, 52-a second electric gate valve, 53-a sand filtration ditch backwashing branch pipe, 6-a low-level reservoir, 60-a backwashing water inlet pump, 61-a fourth check valve and 62-a fifth electric gate valve.
Detailed Description
Example (b): as shown in fig. 1 and 2, the floating decanting ecological rainwater storage tank for sponge city construction comprises an ecological rainwater storage tank main body 1, a floating decanting outflow system 2, a flood discharge and drainage system 3, an air pressure backwashing system 4 and a control system; an ecological rainwater storage pond main body 1 is provided with an ecological flood intercepting ditch 10 at a water inlet, grasses which are suitable for local environment growth and have waterlogging resistance are mainly planted in the ecological flood intercepting ditch 10, a rainwater pipe discharge interface 11 is arranged at the bottom of the ecological rainwater storage pond main body 1, the rainwater pipe discharge interface 13 is connected with a municipal rainwater pipe network through a bypass pipe, a grass planting slope 12 is arranged at the front end of the ecological flood intercepting ditch 10, a permeable brick-stone concrete short wall 13 is arranged between the ecological flood intercepting ditch 10 and the ecological rainwater storage pond main body 1, and a plurality of retaining walls 14 are uniformly arranged on the ecological rainwater storage pond main body 1; aquatic plants are planted in the ecological rainwater storage tank main body 1, and the aquatic plants are reed, cattail, arrowhead and water lily from outside to inside respectively;
as shown in fig. 1, 3 and 4, the floating type decanting water outflow system 2 comprises a slag-stopping cofferdam 20, an air bag 21, a connecting rod 22, a nylon filter screen 23, a porous overflow pipe 24 and a water outlet hose 25; the slag-stopping cofferdam 20 is arranged at the water outlet of the ecological rainwater storage tank main body 1, the slag-stopping cofferdam 20 is provided with a water stop level scale, a water storage level scale and a flood discharge level scale, the rear end of the slag-stopping cofferdam 20 is provided with a slide rail, the porous overflow pipe 24 is provided with a slide sheet, the porous overflow pipe 24 is movably connected with the slide rail through the slide sheet, the porous overflow pipe 24 is provided with a decanter back-flushing branch pipe 240, a nylon filter screen 23 is wrapped on the porous overflow pipe 24, the air bag 21 is fixedly arranged on the porous overflow pipe 24 through a connecting rod 22, a water outlet hose 25 is arranged at the lower end of the porous overflow pipe 24, the porous overflow pipe 24 is connected with a sand filter ditch 5 through the water; the flood discharge and drainage system 3 comprises a flood discharge weir 30 and a flood passage corridor 31; the flood discharge weir 30 is arranged between the floating type decanting and outflow system 2 and the sand filtration ditch 5, and the flood passage 31 is arranged in the middle of the flood discharge weir 30;
as shown in fig. 1 and 5, the pneumatic backwashing system 4 comprises a bag type pneumatic backwashing water tank 40 and a backwashing water outlet main pipe 41; the bag type air pressure backwashing water tank 40 is connected with the sand filtration ditch 5 through a backwashing water outlet main pipe 41 and a sand filtration ditch backwashing branch pipe 53, a fourth check valve 61 and a fifth electric gate valve 62 are arranged at the connection part, the bag type air pressure backwashing water tank 40 is connected with the porous overflow pipe 24 through the backwashing water outlet main pipe 41 and a decanter backwashing branch pipe 240, a third check valve 44 and a fourth electric gate valve 45 are arranged at the connection part, a liquid level sensor 46, a pressure sensor 47, an air supplement device 48 and a safety valve 49 are arranged on the bag type air pressure backwashing water tank 40, and a branch pipeline is arranged on the backwashing water outlet main pipe 41;
as shown in fig. 1 and 3, the sand filtering ditch 5 is used for intercepting and filtering the floating objects in the rainwater for the second time, the sand filtering ditch 5 is connected with a low-level reservoir 6 through a water collecting pipe 50, a first check valve 51 and a second electric gate valve 52 are arranged at the connection part, a sand filtering ditch back washing branch pipe 53 is arranged at the bottom of the sand filtering ditch 5, the cross section of the sand filtering ditch 5 is trapezoidal, a porous concrete plate provided with a filter head is arranged at the bottommost part of the sand filtering ditch 5, cobblestones are used as a cushion layer, and quartz sand is laid on the cushion layer;
as shown in fig. 1, 3 and 5, the low-level reservoir 6 is connected with a bag-type pneumatic backwash water tank 40 through a backwash water outlet header 41, a backwash water inlet pump 60, a second check valve 42 and a third electric gate valve 43 are arranged at the connection, and the first electric gate valve 26, the second electric gate valve 52, the third electric gate valve 43, the fourth electric gate valve 45, the backwash water inlet pump 60 and the fifth electric gate valve 62 are powered by an external power supply.
As shown in fig. 1, the control system includes a controller, a processor and a remote controller, the controller is connected to the first electric gate valve 26, the second electric gate valve 52, the third electric gate valve 43, the fourth electric gate valve 45, the backwash water inlet pump 60 and the fifth electric gate valve 62, the liquid level sensor 46 and the pressure sensor 47 are connected to the processor, and the remote controller and the processor are connected to the controller.
When raining, rainwater on the periphery of the ecological rainwater storage pond main body 1 is intercepted through the grass planting slope 12 and converged to the ecological flood intercepting ditch 10, and rainwater runoff on the peripheral roads is connected to a rainwater pipe discharge interface 11 through a bypass pipe of a rainwater pipe network; when the raining time exceeds 30min, the controller controls the first electric gate valve 26 and the second electric gate valve to operate, the floating type decanting and outflow system 2 starts to operate, upper layer clean water passing through a certain ecological purification effect at the tail end of the ecological rainwater storage tank main body 1 is collected by the porous overflow pipe 24, then is collected to a water outlet through the water outlet hose 25, is discharged to the sand filtration ditch 5 for secondary filtration and purification, and the purified water is accumulated in the low-level reservoir 6 through the water collecting pipe 50 after being self-retained by gravity; when the water level in the low-level reservoir 6 reaches the pump starting water level of the back-flushing water inlet pump 60, the controller controls the back-flushing water inlet pump 60 to be started, water in the low-level reservoir 6 is lifted to the bag-type air pressure back-flushing water tank 40 to be stored, and the back-flushing water inlet pump 60 stops water inflow when the bag-type air pressure back-flushing water tank 40 reaches the full-tank water level; when the water level of the ecological rainwater storage tank main body 1 is lower than the stop water level scale of the water outlet or the water level of the low-level reservoir 6 is higher than the gravity flow water level of the sand filter 5 in the working process of the floating type decanting and flowing system 2, stopping water inflow of the low-level reservoir 6; after the rain stops, the controller controls the fourth electric gate valve 45 and the fifth electric gate valve 62 to open, the back washing water flows out of the bag type air pressure back washing water tank 40 to start back washing, and when the water level of the back washing water in the bag type air pressure back washing water tank 40 reaches the stop water level scale, the controller controls the fourth electric gate valve 45 and the fifth electric gate valve 62 to close, and the back washing stops; in the case of extreme rainstorm weather, when the water level of the ecological rainwater storage pond main body 1 is higher than the height of the flood discharging weir 30, the water is intercepted by the slag-stopping cofferdam 20, passes through the flood discharging weir 30 and is discharged into the nearby water body through the flood passageway 31.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A floating decanting type ecological rainwater storage tank for sponge city construction is characterized by comprising an ecological rainwater storage tank main body (1), a floating decanting outflow system (2), a flood discharge and drainage system (3) and an air pressure backwashing system (4); an ecological flood intercepting ditch (10) is arranged at a water inlet of the ecological rainwater storage pond main body (1), a rainwater pipe discharge interface (11) is arranged at the bottom of the ecological rainwater storage pond main body (1), and the rainwater pipe discharge interface (11) is connected with a municipal rainwater pipe network through a bypass pipe; the floating type decanting and outflow system (2) comprises a slag-stopping cofferdam (20), an air bag (21), a connecting rod (22), a nylon filter screen (23), a porous overflow pipe (24) and an outflow hose (25); the flood discharge and drainage system (3) comprises a flood discharge weir (30) and a flood passage corridor (31); the pneumatic backwashing system (4) comprises a bag type pneumatic backwashing water tank (40) and a backwashing water outlet main pipe (41); the slag-stopping cofferdam (20) is arranged at the water outlet of the ecological rainwater storage tank main body (1), the slag-stopping cofferdam (20) is provided with a stopping water level scale, a storage water level scale and a flood discharge water level scale, the rear end of the slag-stopping cofferdam (20) is provided with a slide rail, a slide sheet is arranged on the porous overflow pipe (24), the porous overflow pipe (24) is movably connected with the slide rail through the slide sheet, a back washing branch pipe (240) of the decanter is arranged on the porous overflow pipe (24), the nylon filter screen (23) is wrapped on the porous overflow pipe (24), the air bag (21) is fixedly arranged on the porous overflow pipe (24) through a connecting rod (22), the water outlet hose (25) is arranged at the lower end of the porous overflow pipe (24), the porous overflow pipe (24) is connected with the sand filtering ditch (5) through the water outlet hose (25), and a first electric gate valve (26) is arranged at the connection position; the sand filtering ditch (5) is used for intercepting and filtering the floating objects in the rainwater for the second time, the sand filtering ditch (5) is connected with a low-level reservoir (6) through a water collecting pipe (50), a first check valve (51) and a second electric gate valve (52) are arranged at the connection part, and a sand filtering ditch backwashing branch pipe (53) is arranged at the bottom of the sand filtering ditch (5); the flood discharge weir (30) is arranged between the floating type decanting and outflow system (2) and the sand filtering ditch (5), and the flood passage corridor (31) is arranged in the middle of the flood discharge weir (30); the bag-type air pressure backwashing water tank (40) is connected with the sand filtration ditch (5) through a backwashing water outlet main pipe (41) and a sand filtration ditch backwashing branch pipe (53), a fourth check valve (61) and a fifth electric gate valve (62) are arranged at the connection position, the bag-type air pressure backwashing water tank (40) is connected with the porous overflow pipe (24) through the backwashing water outlet main pipe (41) and a decanter backwashing branch pipe (240), a third check valve (44) and a fourth electric gate valve (45) are arranged at the connection position, and a liquid level sensor (46), a pressure sensor (47), an air supplement device (48) and a safety valve (49) are arranged on the bag-type air pressure backwashing water tank (40); the low-position water storage tank (6) is connected with the bag type air pressure backwashing water tank (40), a backwashing water inlet pump (60), a second check valve (42) and an electric three-motor gate valve (43) are arranged at the joint, and the first motor gate valve (26), the second motor gate valve (52), the third motor gate valve (43), the fourth motor gate valve (45), the backwashing water inlet pump (60) and the fifth motor gate valve (62) are powered by an external power supply.
2. The floating decanting type ecological rainwater storage tank for sponge city construction as claimed in claim 1, wherein the storage tank further comprises a control system, the control system comprises a controller, a processor and a remote controller, the controller is connected with the first electric gate valve (26), the second electric gate valve (52), the third electric gate valve (43), the fourth electric gate valve (45), the backwashing water inlet pump (60) and the fifth electric gate valve (62), the liquid level sensor (46) and the pressure sensor (47) are connected with the processor, and the remote controller and the processor are connected with the controller.
3. The floating decanting ecological rainwater storage tank for sponge city construction as claimed in claim 1, wherein the ecological intercepting ditch (10) is provided with a grass planting slope (12) at the front end, and a permeable brick-concrete short wall (13) is arranged between the ecological intercepting ditch (10) and the ecological rainwater storage tank main body (1).
4. The floating decanting type ecological rainwater storage tank for sponge city construction as claimed in claim 1, wherein a plurality of retaining walls (14) are uniformly arranged on the ecological rainwater storage tank main body (1).
5. The floating decanting ecological rainwater storage tank for sponge city construction as claimed in claim 1, wherein the ecological intercepting ditches (10) are mainly planted with grasses which are suitable for local environment growth and have waterlogging resistance.
6. The floating decanting ecological rainwater storage tank for sponge city construction as claimed in claim 1, wherein aquatic plants are planted in the ecological rainwater storage tank body (1), and the aquatic plants are reed, cattail, arrowhead and water lily respectively from outside to inside.
7. The floating decanting ecological rainwater storage tank for sponge city construction as claimed in claim 1, wherein the back flush water main (41) is provided with branch pipes.
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| CN208309747U (en) * | 2018-05-31 | 2019-01-01 | 玉溪大红山矿业有限公司 | A kind of ladder slope protection drainage system |
| CN109267445A (en) * | 2018-10-10 | 2019-01-25 | 河海大学 | A kind of sponge urban ecology road rain water is regulated and stored system |
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