CN108104240B

CN108104240B - Flood-stagnation, waterlogging-prevention, water-storage, purification and drainage system

Info

Publication number: CN108104240B
Application number: CN201711174656.5A
Authority: CN
Inventors: 曾誊录
Original assignee: Wisy Rainwater Engineering Technology Shanghai Co ltd
Current assignee: Wisy Rainwater Engineering Technology Shanghai Co ltd
Priority date: 2017-11-22
Filing date: 2017-11-22
Publication date: 2023-11-03
Anticipated expiration: 2037-11-22
Also published as: CN108104240A

Abstract

The invention provides a drainage system which comprises a first drainage area and a second drainage area which are communicated from top to bottom, wherein the widths of the first drainage area and the second drainage area are gradually reduced from top to bottom, the top surface of the first drainage area is opened, a rainwater grate is arranged on the top surface, the second drainage area is provided with a bottom surface, and the second drainage area is provided with a plurality of communicated water flow sections along the water flow direction. The invention further provides application of the drainage system in flood-control, waterlogging-prevention, water storage, purification and drainage. The flood-stagnation, waterlogging-prevention, water-storage, purification and drainage system provided by the invention can be used for effectively draining, purifying and storing rainwater, so that waterlogging can be prevented when heavy rain occurs, and an unconventional water source is provided in drought seasons.

Description

Flood-stagnation, waterlogging-prevention, water-storage, purification and drainage system

Technical Field

The invention belongs to the technical field of drainage facilities, relates to a flood-stagnation, waterlogging-prevention, water-storage, purification and drainage system, and in particular relates to a drainage system for draining, storing and purifying rainwater for preventing waterlogging.

Background

In urban construction, road surface drainage facility efficiency and underground drainage pipeline capacity directly influence urban rainwater collection and drainage. However, in recent years, the phenomenon of water accumulation and even waterlogging on the road surface in various cities throughout the country is serious every rainy season, on the one hand, due to the limited capacity of the existing underground drainage pipeline, and on the other hand, the reason for analyzing the phenomenon is mainly related to the single structure of the existing road surface rainwater grate. At present, in cities, for street drainage, rainwater grate is often simply arranged at the rainwater inlet of a sewer at two sides of the street, the plate-shaped hole-shaped structure can only simply introduce rainwater into the sewer, the sewer is also a discharge channel of sewage in a toilet and a kitchen, a large amount of sewage can be generated to pollute the environment, and meanwhile, the sewer is also a place where mosquitoes are bred and inhabit, a large amount of pests can be generated in the spring, summer and autumn, and harm is generated to people.

At present, more patent applications are related to rainwater grate, as the patent application number 201520515464.6 discloses a grate device for sewer, including the comb board that sets up on the drain port of sewer, set up on the lower extreme end face of comb board and have the container body of discharge port, set up on the container body and act on the spheroid on the discharge port, seal the intercommunication port of drain port and comb board through spheroid and container body, no longer directly communicate the comb board with drain port, prevented the emergence of insect pest and dirty gas pollution, consequently improved the environment and satisfied ponding discharge need.

The utility model provides a prevent anti-taste rainwater grate of revealing of patent application number 201620627262.5, including the pre-buried frame that is equipped with the drain channel that link up from top to bottom, the top of pre-buried frame is equipped with the shutoff and is equipped with the grate body at drain channel upper shed department, the bottom level that is located pre-buried frame is equipped with the hinge that passes drain channel lower shed center, hinge on the hinge is equipped with two and is located the flap of hinge both sides respectively, the hinge dress side bottom of every flap all is equipped with the balancing weight that carries out the shutoff to can drain smoothly again can prevent the smell of its below upwards to be reversed.

The utility model provides an automatic rainwater grate system of removing obstacles of patent application number 201610651453.X disclosure, including the grate grid, remove obstacles unit and power pack, power pack is including being located the drainage well, and be located the inboard rotor of department of grate grid, the rotor includes first pivot and fix a plurality of blades in first pivot, it includes the second pivot and be located the drainage well outside and be located the obstacle removal device of grate grid outside department to remove obstacles unit, the second pivot is connected through first drive mechanism with first pivot, the second pivot is connected and is driven the obstacle removal device through second drive mechanism and reciprocates, drive power pack work through rainwater runoff, thereby drive obstacle removal unit work, make the outside leaf of grate grid and other obstacles keep away from the grate grid.

The utility model provides a road escape canal structure suitable for sponge city is disclosed to patent application number 201611215503.6, includes up end open-ended U type stratum basale, and U type stratum basale is inside to be equipped with the retaining filter layer, and the retaining filter layer separates into upper portion drainage layer and lower part drainage layer, and up end opening covers has the rainwater grate, and the retaining filter layer is from last to including filtering sand layer, permeable soil co-layer, permeable concrete slab downwards. The structure can realize that the road initial runoff is purified and then discharged into the urban drainage system, the permeable concrete slab adopts prefabricated members, and the structure is convenient to replace and maintain and is suitable for sponge urban construction.

However, the rainwater grate and the drainage structure in the patent application cannot simultaneously solve the problems of drainage, water storage, purification and recycling of rainwater.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a flood-preventing, water-storing, purifying and draining system, which is used for solving the problem that the prior art lacks a draining system capable of simultaneously preventing flood, draining, storing water, purifying, recycling and reusing rainwater.

To achieve the above and other related objects, a first aspect of the present invention provides a drainage system, which includes, from top to bottom, a first drainage area and a second drainage area that are penetrated, wherein the widths of the first drainage area and the second drainage area from top to bottom gradually decrease, a top surface of the first drainage area is open, a rain grate is disposed on the top surface, a bottom surface is disposed on the second drainage area, and a plurality of communicating water flow sections are disposed in the second drainage area along the water flow direction.

Preferably, in the plurality of communicated water flowing sections, overflow weirs are arranged between adjacent water flowing sections, a first overflow section and a second overflow section are sequentially arranged on the overflow weirs along the water flowing direction, one end of the first overflow section is communicated with one end of the second overflow section, and the other ends of the first overflow section and the second overflow section are respectively communicated with one end of the water flowing section.

Preferably, the vertical cross section of the first drainage area is trapezoidal. More preferably, the trapezoid is an isosceles trapezoid.

Preferably, the included angle between the side walls of the two sides of the first drainage area along the water flow direction and the horizontal plane is 45-75 degrees.

Preferably, the upper parts of the side walls of the two sides of the first drainage area along the water flow direction are also respectively provided with a flushing head.

Preferably, the rainwater grate comprises a cover plate and a grid, wherein the cover plate is arranged above the grid and is matched with the grid in shape, one side edge of the cover plate is hinged with one side edge of the grid, a turning plate is arranged at the other side edge of the cover plate, and the turning plate outwards extends out of the edge of the cover plate and is higher than the cover plate.

More preferably, the cover plate is provided with a plurality of holes, and the area of the holes is smaller than the area of the gaps surrounded by the grid bars. Further preferably, the aperture of the hole is 1-6mm.

More preferably, the shape of the cover plate is matched with that of the grille, that is, the area of the cover plate is equal to that of the grille, and the cover plate can be fully covered on the grille.

More preferably, the turning plate comprises a first plate body and a second plate body, one end of the first plate body is connected with the edge of the cover plate, the other end of the first plate body is connected with one end of the second plate body, and the second plate body is higher than the cover plate and parallel to the cover plate.

Preferably, the middle cover plate, the grille and the turning plate of the rainwater grate are made of corrosion-resistant materials. Such as cast iron, plastic, etc.

Preferably, the installation position of the rainwater grate is 1-10cm lower than the ground.

Preferably, the bottom edge of the longitudinal section of the second drainage area is in an angle or arc shape. More preferably, the bottom edge of the longitudinal section of the second drainage area is arc-shaped.

Preferably, the depth of the flow sections is the same.

More preferably, the first overflow section and the second overflow section are inclined upwards, the upper end of the first overflow section is communicated with the upper end of the second overflow section, the lower end of the first overflow section is communicated with one end of the water flowing section, and the inclination angle between the first overflow section and the horizontal plane is 1-5 degrees; the lower end of the second overflow section is communicated with one end of the water flowing section, and the inclination angle between the second overflow section and the horizontal plane is 1-5 degrees.

Preferably, a water outlet is arranged on the bottom surface of the water flowing section, and the water outlet is communicated with the filtering unit through a pipeline.

More preferably, the water outlet is provided on a bottom surface of one end of the water flow section communicating with the first overflow section.

More preferably, the filtration unit is a cyclone separator. The cyclone separator is a conventionally used cyclone separator, can be purchased from the market,

further preferably, the pore size of the filter screen in the cyclone separator is 0.1-0.5mm.

More preferably, the filtering unit is respectively communicated with the clean water storage unit and the sewage treatment unit through pipelines.

Further preferably, the clean water storage unit is selected from one of a water storage tank and a water storage tank.

Further preferably, the clean water storage unit is externally connected with a water suction pump.

Further preferably, the sewage treatment unit is selected from one of a sewage well and a water tank.

The second aspect of the invention provides the use of a drainage system for flood control, water logging, water storage and purification drainage.

As described above, the flood-preventing waterlogging-preventing water-storing, purifying and draining system provided by the invention has the following beneficial effects:

(1) According to the flood-stagnation, waterlogging-prevention, water-storage, purification and drainage system, provided by the invention, the rainwater grate is perfectly filtered by arranging the plurality of water flowing sections and the overflow weir, garbage and sludge can not be accumulated in the rainwater grate, and the relative odor is less; meanwhile, large garbage is prevented from falling into the rainwater grate, and the rainwater grate is easy to clean from the road surface.

(2) According to the flood-stagnation, waterlogging-prevention, water-storage, purification and drainage system provided by the invention, the plurality of water flowing sections and the overflow weir are arranged, so that the water flowing sections are basically at the same depth, and the water flowing sections cannot be pushed up.

(3) According to the flood-stagnation, waterlogging-prevention, water-storage, purification and drainage system provided by the invention, the rainwater is guided into the filtering unit for cyclone separation and filtration by arranging the plurality of water flowing sections and the overflow weir, clean rainwater is collected and flows into the clear water storage unit, and impurities such as sewage, sediment and the like flow into the sewage treatment unit, so that the rainwater is effectively purified and stored.

(4) According to the flood-preventing waterlogging water storage purification drainage system, the plurality of water flowing sections and the overflow weir are arranged, when the rainfall is small, rainwater enters the filtering unit from the water outlet through the rainwater grate for filtering, when the rainfall exceeds the design recovery standard, the water level in the water flowing section naturally rises, the rising rainwater flows through the overflow weir, the overflow weir guides excessive rainwater to continuously move forward along the flowing direction of the water, and the rainwater is continuously split and filtered in the subsequent water flowing sections, so that the rainwater is greatly reduced, and waterlogging can be prevented when the rainfall occurs. And provides a non-traditional source of water during the drought season.

(5) The flood-stagnation, flood-prevention, water-storage, purification and drainage system provided by the invention has the advantages of simple structure, low cost, easiness in cleaning, capability of ensuring that water storage is not deteriorated, compliance with national regulation requirements, basic functions of flood-stagnation and peak clipping, complete disaster prevention and provision of various water in dry seasons.

Drawings

Fig. 1 is a schematic view showing a partial perspective structure of a drainage system according to the present invention.

Fig. 2 is a schematic plan view of a drainage system according to the present invention.

Fig. 3 shows a top view of a rain grate according to the invention.

Fig. 4 shows a side view of a rain grate according to the invention.

Reference numerals

1. Drainage system

11. First drainage area

12. Second drainage area

121. Running water section

122. Overflow weir

1221. First overflow section

1222. Second overflow section

13. Rainwater grate

131. Cover plate

1311. Holes and holes

132. Grille

133. Turning plate

1331. First plate body

1332. Second plate body

14. Water outlet

2. Filtering unit

3. Clear water storage unit

4. Sewage treatment unit

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

Please refer to fig. 1 to 4. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.

As shown in fig. 1-2, the present invention provides a drainage system, the drainage system 1 includes, from top to bottom, a first drainage area 11 and a second drainage area 12 that are penetrated, the widths of the first drainage area 11 and the second drainage area 12 from top to bottom gradually decrease, the top surface of the first drainage area 11 is open, a rain grate 13 is disposed on the top surface, the second drainage area 12 is provided with a bottom surface, and the second drainage area 12 is provided with a plurality of communicating running water sections 121 along the water flowing direction.

In a preferred embodiment, as shown in fig. 2, in the plurality of communicating water flow sections 121, an overflow weir 122 is disposed between adjacent water flow sections 121, the overflow weir 122 is sequentially provided with a first overflow section 1221 and a second overflow section 1222 along the water flow direction, one end of the first overflow section 1221 is communicated with one end of the second overflow section 1222, and the other ends of the first overflow section 1221 and the second overflow section 1222 are respectively communicated with one end of the water flow section 121.

In a preferred embodiment, as shown in fig. 1, the first drainage area 11 has a trapezoidal, preferably isosceles trapezoid, vertical cross-section. The structure of the first drainage area 11 allows rainwater to be easily concentrated to the lower end of the drainage system 1.

In a preferred embodiment, as shown in fig. 1, the two side walls of the first drainage area 11 along the water flow direction respectively form an angle of 45-75 ° with the horizontal plane. This structure makes it easy for rainwater to concentrate to the lower end of the drainage system 1.

In a preferred embodiment, the upper parts of the side walls of the first drainage area 11 along the water flow direction are also provided with flushing heads, respectively. The flushing head is used for spraying water for flushing, so that the flushing head is easy to clean and the inner wall is kept highly clean.

In a preferred embodiment, as shown in fig. 1-4, the rain grate 13 includes a cover plate 131 and a grid 132, the cover plate 131 is located above the grid 132 and the cover plate 131 matches the shape of the grid 132, one side edge of the cover plate 131 is hinged with one side edge of the grid 132, the other side edge of the cover plate 131 is provided with a flap 133, the flap 133 extends outwards beyond the edge of the cover plate 131 and the flap 133 is higher than the cover plate 131. The structure prevents large garbage from falling into the rainwater grate 13, and the rainwater grate 13 is easy to clean from the road surface. Meanwhile, the rainwater grate 13 can be opened only by a shovel by cleaning staff conveniently, and the rainwater grate is convenient to clean.

Further, as shown in fig. 3, a plurality of holes 1311 are formed in the cover plate 131, and the area of the holes 1311 is smaller than the area of the gaps surrounded by the bars of the grille 132. The aperture 1311 has a diameter of 1-6mm. This structure prevents large garbage from falling into the interior of the rain grate 13.

Further, as shown in fig. 3-4, the flap 133 includes a first plate 1331 and a second plate 1332, one end of the first plate 1331 is connected to the edge of the cover plate 131, the other end of the first plate 1331 is connected to one end of the second plate 1332, and the second plate 1332 is higher than the cover plate 131 and parallel to the cover plate 131. The rainwater grate 13 can be opened by a cleaning person just through the shovel.

In a preferred embodiment, the cover plate 131, the grille 132 and the flap 133 of the rain grate 13 are made of a corrosion-resistant material. Such as cast iron, plastic, etc., which are relatively low in price, and are protected from theft and damage.

In a preferred embodiment, the mounting position of the rain grate 13 is 1-10cm lower than the ground. Is convenient for the natural inflow of rainwater.

In a preferred embodiment, as shown in fig. 1, the bottom edge of the longitudinal section of the second drainage area 12 is angled or curved, preferably curved. The structure of the second drainage area 12 makes the rainwater easily concentrated to the lower end of the drainage system 1, avoids the silt, sundries and sewage from being blocked in the drainage system 1, and is convenient for guiding the rainwater to flow into the water flow section 121.

In a preferred embodiment, as shown in fig. 2, the first overflow section 1221 is inclined upward, the upper end of the first overflow section 1221 is connected to the upper end of the second overflow section 1222, the lower end of the first overflow section 1221 is connected to one end of the water flow section 121, and the inclination angle between the first overflow section 1221 and the horizontal plane is 1-5 °. The bottom surface of the water flow section 121 is provided with a water outlet 14, and the water outlet 14 is communicated with the filtering unit 2 through a pipeline. The water outlet 14 is disposed on a bottom surface of one end of the water flow section 121, which is communicated with the first overflow section 1221. When the rainfall is small, rainwater enters the filtering unit 2 through the rainwater grate 13 from the water outlet 14 for filtering, and the rainwater cannot directly flow out of the first overflow section 1221. When the amount of rain exceeds the design recovery standard, the water level in the water flow path naturally rises, and the rising rainwater flows over the overflow weir 122.

In a preferred embodiment, as shown in fig. 2, the second overflow section 1222 is inclined upwards, the upper end of the second overflow section 1222 is connected with the upper end of the first overflow section 1221, the lower end of the second overflow section 1222 is connected with one end of the water flow section 121, the inclination angle between the second overflow section 1222 and the horizontal plane is 1-5 ° so that when the rainfall exceeds the design recovery standard, the water level in the water flow section 121 naturally rises, the rising rainwater flows over the overflow weir 122, the overflow weir 122 guides excessive rainwater to continue to move along the water flow direction, and the rainwater is continuously split and filtered in the subsequent water flow section 121, so that the rainwater is greatly reduced, and the occurrence of waterlogging can be prevented when the storm occurs. The depth of the water flow section 121 is the same, and the water flow section 121 is not pushed up.

Further, as shown in fig. 2, the filter unit 2 is a cyclone separator. The aperture of the filter screen in the cyclone separator is 0.1-0.5mm. The recovered rainwater is clear and can meet the bottom.

Further, as shown in fig. 2, the filtering unit 2 is respectively communicated with the clean water storage unit 3 and the sewage treatment unit 4 through pipelines. The clean water storage unit 3 is selected from one of a water storage tank and is used for storing clean water. The clean water storage unit 3 is externally connected with a water suction pump, and the water suction pump is convenient for taking clean rainwater stored in the clean water storage unit 3. The sewage treatment unit 4 is selected from one of a sewage well and a water tank, and is convenient for treating impurities such as sewage, sediment and the like generated after filtration and separation by the filtering unit 2.

The following describes the use of the flood-control, waterlogging-prevention, water-storage, purification and drainage system of the present invention with reference to fig. 1-4.

After a user obtains a flood-control, water-storage, purification and drainage system as shown in fig. 1-4, the drainage system 1 is positioned on the ground adjacent to the pavement on both sides of the roadway.

When raining, when the rainfall is less, the rainwater flows into drainage system 1 through rainwater grate 13, namely through hole 1311 on apron 131, again flow into drainage system 1's first drainage zone 11 and second drainage zone 12 through grid 132 in, because hole 1311's area is less than the space area that grid 132 bars enclose, avoid large-scale rubbish to fall into rainwater grate 13 inside, and easily clear up in the rainwater grate 13 from the road surface, apron 131 edge is equipped with turns over board 133, easily cleanup crew clear up in the rainwater grate 13 from the road surface, simultaneously rainwater grate 13 inside can not accumulate rubbish mud, the odorization condition rarely takes place. Because the first drainage area 11 is in a trapezoid shape which is inwards inclined along the left side and the right side of the water flow direction, the width of the first drainage area from top to bottom is gradually reduced, so that rainwater is easy to concentrate to the corner or arc-shaped area of the bottom edge of the longitudinal section of the second drainage area 12, and sediment, sundries and sewage are prevented from being blocked in the drainage system 1. Since the first overflow section 1221 in the overflow weir 122 is inclined upwards, rainwater naturally collects on the horizontal running water section 121 communicated with the first overflow section 1221, and flows into the filtering unit 2 through the water outlet 14 arranged on the bottom surface of one end of the running water section 121 communicated with the first overflow section 1221, and is separated and filtered by the filtering unit 2, namely the cyclone separator, clean rainwater flows into the clean water storage unit 3 through the pipeline for storage, and impurities such as sewage and sediment generated after separation enter the sewage treatment unit 4 through the pipeline for treatment. The clean rainwater stored in the fresh water storage unit 3 can provide various kinds of water during dry seasons.

During raining, when the rainfall is great, the rainwater flows into drainage system 1 through rainwater grate 13, namely through hole 1311 on apron 131, again in the first drainage zone 11 of drainage system 1 and second drainage zone 12 are flowed into through grid 132, because the area of hole 1311 is less than the void area that grid 132 bars enclose, avoid large-scale rubbish to fall into rainwater grate 13 inside, apron 131 edge is equipped with turns over board 133, easily cleanup crew clear up in the rainwater grate 13 from the road surface, simultaneously rainwater grate 13 inside can not accumulate rubbish mud, the condition of stinking less takes place. Because the first drainage area 11 is in a trapezoid shape which is inwards inclined along the left side and the right side of the water flow direction, the width of the first drainage area from top to bottom is gradually reduced, so that rainwater is easy to concentrate to the corner or arc-shaped area of the bottom edge of the longitudinal section of the second drainage area 12, and sediment, sundries and sewage are prevented from being blocked in the drainage system 1. When the rainfall exceeds the design recovery standard, a part of rainwater flows into the filtering unit 2 through the pipeline through the water outlet 14 arranged on the bottom surface of one end of the running water section 121 communicated with the first overflow section 1221, is separated and filtered by the filtering unit 2, namely the cyclone separator, and clean rainwater flows into the clean water storage unit 3 through the pipeline for storage, and impurities such as sewage, sediment and the like generated after separation enter the sewage treatment unit 4 through the pipeline for treatment. The other part of rainwater naturally rises due to the water level in the water flowing section 121, the rising rainwater flows through the overflow weir 122, the overflow weir 122 guides excessive rainwater to continuously move forward along the water flowing direction through the second overflow section 1222 which is inclined upwards, and the rainwater is continuously split and filtered in the subsequent water flowing section 121, so that the rainwater on the road surface is greatly reduced, and the occurrence of waterlogging can be prevented when the storm occurs. The clean rainwater stored in the fresh water storage unit 3 can provide various kinds of water during dry seasons.

In summary, the flood-preventing water-storing, purifying and draining system provided by the invention can effectively drain, purify and store rainwater, so that waterlogging can be prevented when heavy rain occurs, and a non-traditional water source is provided in drought seasons. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. The drainage system is characterized in that the drainage system (1) comprises a first drainage area (11) and a second drainage area (12) which are communicated from top to bottom, the widths of the first drainage area (11) and the second drainage area (12) are gradually reduced from top to bottom, the top surface of the first drainage area (11) is opened, a rainwater grate (13) is arranged on the top surface, the second drainage area (12) is provided with a bottom surface, and the second drainage area (12) is provided with a plurality of communicated water flow sections (121) along the water flow direction;

among the plurality of communicated water flowing sections (121), overflow weirs (122) are arranged between the adjacent water flowing sections (121), a first overflow section (1221) and a second overflow section (1222) are sequentially arranged on the overflow weirs (122) along the water flowing direction, one end of the first overflow section (1221) is communicated with one end of the second overflow section (1222), and the other ends of the first overflow section (1221) and the second overflow section (1222) are respectively communicated with one end of the water flowing section (121);

the rainwater grate (13) comprises a cover plate (131) and a grating (132), wherein the cover plate (131) is arranged above the grating (132) and is matched with the grating (132) in shape, one side edge of the cover plate (131) is hinged with one side edge of the grating (132), a turning plate (133) is arranged on the other side edge of the cover plate (131), and the turning plate (133) outwards extends out of the edge of the cover plate (131) and is higher than the cover plate (131).

2. A drainage system according to claim 1, wherein the side walls of the first drainage area (11) are at an angle of 45-75 ° to the horizontal in the direction of water flow.

3. A drainage system according to claim 1, wherein a plurality of holes (1311) are provided in the cover plate (131), and the area of the holes (1311) is smaller than the area of the gaps surrounded by the bars of the grid (132).

4. A drainage system according to claim 1, wherein the flap (133) comprises a first plate (1331) and a second plate (1332), one end of the first plate (1331) is connected to the edge of the cover plate (131), the other end of the first plate (1331) is connected to one end of the second plate (1332), and the second plate (1332) is higher than the cover plate (131) and parallel to the cover plate (131).

5. A drainage system according to claim 1, wherein the bottom edge of the longitudinal section of the second drainage zone (12) is angular or arcuate.

6. A drainage system according to claim 1, characterized in that the bottom surface of the water flow section (121) is provided with a water outlet (14), the water outlet (14) being in communication with the filter unit (2) via a pipe.

7. A drainage system according to claim 6, wherein the filter unit (2) is in communication with the fresh water storage unit (3) and the sewage treatment unit (4) via pipes, respectively.

8. A drainage system according to any of claims 1 to 7, wherein the drainage system is for use in flood control and water storage purification drainage.