Drought stream type water flow channel suitable for rainwater regulation and storage wetland purification system

Abstract

The utility model relates to a dry stream type water flow channel suitable for a rainwater regulation and storage wetland purification system, which is characterized in that an upstream water body is communicated with a downstream water body by adopting a dry stream, and a first water distribution gabion wall used as a water inlet overflow weir is transversely arranged at the communicated part of the dry stream and the upstream water body; a second water distribution gabion wall used as a water making overflow weir is transversely arranged at the position where the first water distribution gabion wall is communicated with the downstream water body, and the first water distribution gabion wall and the second water distribution gabion wall are each provided with a low-position water passing channel. The water distribution gabion wall has a good rainwater retention effect in the process of transferring incoming water of an upstream water body to a downstream water body, pollutants in the water can be effectively filtered and diluted, the water quality is purified, the incoming water and outgoing water can be filtered and purified through the water permeation function of the water distribution gabion wall, and the water distribution gabion wall can be used for filtering and purifying water. And incoming water and outgoing water can quickly pass through when the incoming water quantity is too large, so that overflow caused by retention in upstream water and stream is avoided.

Description

Technical Field

[0001] The utility model relates to a dry creek type water flow channel suitable for a rainwater storage wetland purification system, belonging to the technical field of environmental protection. Background Art

[0002] A dry creek refers to a creek bed that does not release water. It is an artificial imitation of a dry riverbed in nature and is an important water treatment facility in the construction of sponge cities. When it does not rain, it serves as a landscape. When there is more precipitation in the rainy season, it can hold water and be used as a rainwater transfer facility. For example, the utility model patent with the announcement number CN213358493U discloses a dry creek structure, including a dry creek bed, at least two weirs are arranged at intervals along the longitudinal direction of the dry creek bed, wherein the bottom of the weir extends to the bottom of the rammed earth layer at the bottom of the dry creek bed, the above-ground part of the weir protrudes from the pebble layer of the dry creek bed, and the top of the weir is connected to the stone layer of the dry creek bed. The dry creek structure can reduce the speed of water flowing from the high terrain of the dry creek to the low terrain through the weirs arranged at intervals, avoid the damage of the dry creek bed caused by excessive water flow, protect the dry creek structure, and also avoid the problem of flood disasters caused by the terrain intersection at the tail of the dry creek. For another example, the utility model patent with announcement number CN207330521U discloses an ecological dry creek structure for deep treatment of recycled water, including a creek bed, the creek bed has an inlet end and an outlet end, and vegetation is planted on both sides of the creek bed. The creek bed includes a compacted soil layer, a slow-release carbon source layer, a coarse sand layer, a gravel layer and a natural stone layer arranged in sequence from bottom to top. The slow-release carbon source layer is 2-3cm thick, the coarse sand layer is 3-4cm thick, the gravel layer is 8-10cm thick, and the natural stone layer is 17-22cm thick. The dry creek structure is constructed on the basis of the original landscape pattern, and the dry creek is used to deeply treat the landscape recycled water replenishment. It has low cost, simple method, good treatment effect, and greatly improves the water quality of the inlet water of environmentally sensitive or fragile water body self-purification function water bodies, thereby reducing the risk of blue-green algae outbreaks. In addition, the dry creek is coordinated with the surrounding environment as a whole, and the scenery is beautiful, achieving the purpose of ecological management and harmony with nature.

[0003] The above-mentioned dry creeks can effectively divert rainwater and surface runoff and purify water quality. However, they still have common limitations: since they all use overflow to transport water to downstream water bodies or water treatment facilities, they can only process rainwater within their own processing capacity. When there is heavy rainfall in the rainy season and the amount of water entering the dry creek is too large, it is easy to cause the water storage in the dry creek to exceed the limit and overflow, and the surface runoff to be retained and accumulated, and even cause the stored water to flow back, causing the dry creek function to fail. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a dry creek type water flow channel suitable for a rainwater storage and wetland purification system, which can not only transfer rainwater between upstream and downstream water bodies and purify the water quality, but also quickly introduce the incoming water into the downstream water body when the incoming water volume is too large to avoid stagnation and overflow.

[0005] The technical scheme for achieving the above-mentioned purpose of the utility model is: a dry creek type water flow channel suitable for a rainwater storage wetland purification system, a dry creek is used to connect an upstream water body with a downstream water body, a first water distribution gabion wall used as a water inlet overflow weir is arranged along the horizontal direction (a direction perpendicular to or approximately perpendicular to the water flow direction, the same below) at the connection point between the dry creek and the upstream water body, and a second water distribution gabion wall used as a water outlet overflow weir is arranged along the horizontal direction at the connection point with the downstream water body, and the first water distribution gabion wall and the second water distribution gabion wall are both provided with a low-level (lower than the wall top) water passage.

[0006] The cross section of the dry creek is an inverted trapezoidal trough structure, and the slope of the side slope is not greater than 1:3, for example, 1:4, 1:3.5 or 1:3, preferably 1:3.

[0007] Preferably, the bottom of the dry creek slopes downward from the direction opposite to the connection with the downstream water body toward the connection with the downstream water body, with a slope of ≥0.3%.

[0008] Preferably, the bottom and slope of the dry creek adopt a plain soil base layer, a pebble layer is laid on the base layer, and a geotextile is laid between the base layer and the pebble layer.

[0009] Preferably, the connection point between the dry creek and the upstream water body is located on the opposite side slope of the connection point between the dry creek and the downstream water body.

[0010] Preferably, an energy dissipation belt is provided downstream of the first water distribution gabion wall in the dry creek, and the energy dissipation belt is composed of a block stone layer laid on the creek bottom, and the block stone layer is laid from the inner wall bottom of the first water distribution gabion wall along the slope where it is located to the creek bottom.

[0011] Preferably, the first water distribution gabion wall and the second water distribution gabion wall have the same structure, both consisting of water distribution gabions arranged in rows along the transverse direction, the water distribution gabions are divided into multiple groups along the arrangement direction, and a water-passing spacing constituting the low-level water-passing channel is left between adjacent water distribution gabion groups.

[0012] The widths of the water-passing spacings of the water distribution gabion wall (the first water distribution gabion wall and / or the second water distribution gabion wall) (the width in the transverse direction or along the extension direction of the water distribution gabion wall) may be the same or different. Preferably, the widths of the water-passing spacings are the same.

[0013] Preferably, the number of water distribution gabions in the water distribution gabion group is one or more.

[0014] Preferably, the lengths of the water distribution gabion groups in the arrangement direction are the same, that is, the number of water distribution gabions in the water distribution gabion groups is the same.

[0015] Preferably, the water distribution gabions constituting the water distribution gabion wall are arranged in a single row or in several rows along the horizontal direction.

[0016] Preferably, a slow-flow gabion is provided in the water-passing spacing, and the side walls of the slow-flow gabion (the side walls along the extension direction of the water distribution gabion wall) are respectively tightly attached to the side walls of the water distribution gabion on the corresponding sides, the top surface height of the slow-flow gabion is lower than the top surface height of the water distribution gabion, and the particle size of the built-in stone of the slow-flow gabion is larger than the particle size of the built-in stone of the water distribution gabion.

[0017] The water distribution gabion and the slow-flow gabion are both composed of cage nets and pebbles filled therein. The pebbles built into the water distribution gabion are usually pebbles with a particle size of 60-80 mm, and the pebbles built into the slow-flow gabion are usually pebbles with a particle size of 80 mm-150 mm.

[0018] The beneficial effects of the utility model are:

[0019] (1) The utility model has a good effect of retaining rainwater in the process of transferring water from the upstream water body to the downstream water body, which can effectively filter and dilute pollutants in the water, thereby preliminarily purifying the rainwater. The retained rainwater has enough time to penetrate downward in the stream, which can effectively conserve groundwater. Through the transfer of dry streams, the rational utilization and discharge of rainwater resources are realized, the ecological environment of the city is improved, the landscape value and living comfort of the city are enhanced, and the risk of urban waterlogging can be effectively reduced, thereby improving the city's flood resistance capacity;

[0020] (2) Since the water distribution gabion wall is used as an overflow weir, when the upstream water level is lower than the height of the water distribution gabion wall (the top surface height of the wall), due to the seepage / permeability effect of the gabion, a certain amount of water will still flow through (only when the upstream water level is higher than the bottom height of the water distribution gabion wall), which is conducive to maintaining continuous flow when the upstream water level is low / the water inflow is small. Furthermore, since a suitable low-level water passage such as a water passage spacing can be set on the wall of the water distribution gabion wall, the water passage resistance can be reduced through the water passage gap, thereby ensuring the required seepage / permeability effect while helping to ensure the density of the water distribution gabion wall (the main part), thereby ensuring the strength of the water distribution gabion wall. By flexibly / appropriately setting the number and width of the water passage spacing, the water flow and the direction of the incoming water in a unit time can be effectively controlled, thereby achieving reasonable water distribution into the pond body;

[0021] (3) Due to the setting of slow-flow gabions within the water-passing interval, the water distribution gabion wall can treat the incoming water and outgoing water in different ways according to the different inflow and water storage in the stream. While filtering and purifying the incoming water and outgoing water to the maximum extent, it can prevent rainwater from being retained in the upstream water body and the stream. Among them, (taking the outgoing water of the dry stream as an example, the incoming water of the dry stream is the same), when the water level in the stream is lower than the top surface height of the slow-flow gabion, the outgoing water flows through the water distribution gabion and the slow-flow gabion by infiltration, slowing down the outgoing water and dissipating energy and achieving filtration and purification. Due to the large particle size of the stone in the slow-flow gabion, Due to the stone particle size in the water distribution gabion, the water flow velocity flowing through the slow-flow gabion will be greater than the water flow velocity flowing through the water distribution gabion, so that it can filter and purify all the outflow while reducing the outflow to the greatest extent and control the water level in the stream. When the water level in the stream is higher than the top surface height of the slow-flow gabion, the water above the top surface height of the slow-flow gabion will quickly flow to the downstream water body through the water pass gap (referring to the water pass gap above the slow-flow gabion), so that the water level in the stream can be restored to below the top surface height of the slow-flow gabion as quickly as possible, thereby realizing the filtration and purification of the outflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional structure diagram of an implementation mode of the utility model;

[0023] Figure 2 It is a structural schematic diagram of an implementation method of the water distribution gabion wall of the utility model;

[0024] Figure 3 yes Figure 2 A schematic diagram of a top view structure;

[0025] Figure 4 It is a structural schematic diagram of a second embodiment of the water distribution gabion wall of the utility model;

[0026] Figure 5 yes Figure 4 A schematic diagram of a top view structure;

[0027] Figure 6 It is a top view structural schematic diagram of a third embodiment of the water distribution gabion wall of the utility model;

[0028] Figure 7 It is a top structural schematic diagram of a fourth implementation mode of the water distribution gabion wall of the utility model. DETAILED DESCRIPTION

[0029] See also Figure 1The utility model discloses a dry stream type water flow channel suitable for a rainwater regulation and storage wetland purification system, which is provided with a dry stream, wherein the dry stream connects an upstream water body and a downstream water body, and is used to transfer rainwater stored in an upstream water body (for example, a pre-pond or a pre-treatment pond of a rainwater regulation and storage wetland purification system) to a downstream water body (for example, a wetland purification pond of a rainwater regulation and storage wetland purification system). According to actual needs, the heights of a first water distribution gabion wall 1 and a second water distribution gabion wall 2 are appropriately set, so that the wall top height of the first water distribution gabion wall and the height of a low-level water-passing channel are respectively higher than the wall top height of the second water distribution gabion wall. The height of the low-level water passage is determined by the following formula: the height of the low-level water passage of the first water distribution gabion wall may be no higher than the top height of the second water distribution gabion wall when the length of the dry creek (the length along the water flow path) is not large (when the required water flow velocity can be achieved), so that when the water level of the dry creek is lower than the water level of the upstream water body (adjacent area) and higher than the water level of the downstream water body (adjacent area) under continuous flow, and water (for example, rainwater) can flow along the preset flow path, that is, from the upstream water body to the dry creek, and then from the dry creek to the downstream water body. A first water distribution gabion wall 1 is provided in the horizontal direction (in the direction perpendicular or approximately perpendicular to the water flow direction, the same below) at the connection point between the dry creek and the upstream water body (usually the water inlet of the dry creek), which is used to distribute rainwater flowing from the upstream water body to the dry creek. A second water distribution gabion wall 2 is provided in the horizontal direction at the connection point between the dry creek and the downstream water body (usually the water outlet of the dry creek), which is used to distribute rainwater flowing from the dry creek to the downstream water body. When the water level on the water-facing side (upstream water body side) of the first water distribution gabion wall is higher than the height of the first water distribution gabion, the water of the upstream water body will quickly flow over the first water distribution gabion wall. Therefore, the height of the top surface (or wall top) of the first water distribution gabion wall can basically / usually limit the maximum water level of the upstream water body (adjacent area). On the other hand, since a low-level water flow channel is provided in the water distribution gabion wall (this applies to both the first water distribution gabion wall and the second water distribution gabion wall), and the water flow capacity of the low-level water flow channel (water flow rate per unit height) can be significantly lower than the overflow water flow capacity (water flow capacity after exceeding the top surface of the water distribution gabion wall), the water level of rainwater stored in the upstream water body (water level in the adjacent area) can flow into the dry creek at a lower speed through the low-level water flow channel in the first water distribution gabion wall when the water level does not exceed that of the first water distribution gabion wall, thereby maintaining continuous flow when the upstream (influent) water volume is relatively small / the water level is relatively low, and does not hinder the overflow capacity when the upstream (influent) water volume is relatively large / the water level is relatively high. Similarly, when the water level near the second water distribution gabion wall in the dry creek does not exceed that of the second water distribution gabion wall, the water can flow into the downstream water body at a lower speed through the low-level water passage in the second water distribution gabion wall, thereby maintaining continuous flow when the water volume / water level of the dry creek (inlet) is relatively small, and will not hinder the overflow capacity when the water volume / water level of the dry creek (inlet) is relatively large.

[0030] The cross-section of the dry creek is preferably an inverted trapezoidal trough structure, and the slope of the side slope is not greater than 1:3, such as 1:4, 1:3.5 or 1:3, preferably 1:3, to ensure its water-receiving capacity.

[0031] The bottom of the dry creek is preferably inclined downward from the opposite side of the connection with the downstream water body toward the direction of the connection with the downstream water body, with a slope ≥0.3%, and the water flow velocity is ensured not to exceed 2.0m / s, which not only helps the rainwater in the dry creek to flow toward the downstream water body, but also prevents the water flow velocity from being too fast to affect the effects of retention, purification and infiltration.

[0032] The bottom and slope of the dry creek preferably use a base soil layer 3, which is formed by compacting local base soil. A pebble layer 4 is laid on the base soil for filtering and purifying rainwater. A geotextile is laid between the base soil and the pebble layer to filter rainwater and prevent the base soil from floating. The height of the pebble layer is preferably 300 mm, and the particle size of the pebble is preferably 60-80 mm, so as to ensure the filtering and purification effect of rainwater and the structural strength of the creek bottom.

[0033] Preferably, the connection point between the dry creek and the upstream water body is located on the opposite slope of the connection point between the dry creek and the downstream water body, that is, the water inlet of the dry creek is located on the opposite slope of its water outlet, so that the rainwater entering the dry creek can flow through the maximum flow path in the dry creek, thereby improving the filtering and purification effect of the rainwater.

[0034] An energy dissipation belt is preferably provided downstream of the first water distribution gabion wall in the dry creek, and the energy dissipation belt is composed of a stone layer 5 laid on the bottom of the creek, and the stone layer is laid from the inner wall bottom of the first water distribution gabion wall along the slope where it is located to the bottom of the creek. In this way, the incoming water distributed by the first water distribution gabion wall first contacts the stone layer when entering the dry creek, and then slowly flows into the creek bottom after dissipating energy through the stone layer, which can effectively reduce the scouring of the slope and creek bottom of the dry creek by the incoming water.

[0035] See also Figure 2-Figure 7 The structure of the first water distribution gabion wall and the second water distribution gabion wall is usually the same, both of which are composed of water distribution gabions 6 arranged in rows along the horizontal direction, and their main functions are to control the amount of rainwater retention, improve the purification effect and dissipate energy (slow down the water flow when the amount of rainwater is large). The water distribution gabions are divided into multiple groups along the arrangement direction (horizontally), and there is a water gap (or water outlet) 7 between adjacent water distribution gabion groups. The water distribution gabion wall can not only play the role of water distribution, but also facilitate pedestrian passage. The horizontal length of each group of water distribution gabions and the number and width of the water outlets can be flexibly set according to the actual terrain and construction needs, which can effectively control the amount of water flowing and the direction of the incoming water in a unit time, and realize reasonable water distribution downstream.

[0036] The water outlet can also be arranged in other suitable ways, for example, the water distribution gabion wall is built by displacing the water distribution gabions up and down. After the water distribution gabion wall is built and stabilized, part of the water distribution gabions in the middle of the wall are removed to form the water outlet.

[0037] The widths of the water flow spacings of the water distribution gabion wall (the first water distribution gabion wall and / or the second water distribution gabion wall) (the width in the transverse direction or along the extension direction of the water distribution gabion wall) may be the same or different. The widths of the water flow spacings are preferably the same so that the water flow volume of each water flow spacing is the same, which facilitates water distribution management and control.

[0038] The number of water distribution gabions in the water distribution gabion group can be one or more. The specific number can be determined according to the number of water-passing spacings set according to the local rainwater storage demand. When the water distribution gabion wall includes multiple layers of water distribution gabions, the water distribution gabions of the water distribution gabion group can be one vertical row or several vertical rows.

[0039] The lengths of the water distribution gabion groups in the arrangement direction are the same, that is, the number of water distribution gabions in the water distribution gabion groups is the same, so that the spacing between adjacent water-passing spacings is the same, which is both beautiful and can ensure uniform water distribution downstream, facilitating management and control.

[0040] The water distribution gabions constituting the water distribution gabion wall may be arranged in a single row or in several rows (arranged in several rows in the front-to-back direction) in the transverse direction. When arranged in several rows, the water distribution gabions in adjacent rows may be arranged in any of the following ways:

[0041] (1) The adjacent rows of water distribution gabions are closely attached to each other (along the water flow direction), and the water-passing distances of the adjacent rows of water distribution gabions are aligned front to back. This arrangement is equivalent to increasing the width of the water distribution gabion wall in the front-to-back direction, improving the structural strength, and enhancing the impact resistance and stability;

[0042] (2) If Figure 6 As shown, there is a gap between adjacent rows of water distribution gabions, and the water-passing gaps of adjacent rows of water distribution gabions are aligned front and back. In this way, when the incoming water passes through the water-passing opening of the front row of water distribution gabions in the adjacent rows of water distribution gabions, it will stay and accumulate briefly in the space between the front and rear rows of water distribution gabions to dissipate energy and reduce speed.

[0043] (3) If Figure 7As shown, there is a spacing between adjacent rows of water distribution gabions, and the water-passing spacings of adjacent rows of water distribution gabions are staggered (staggered along the extension direction of the water distribution gabion wall). With this arrangement, the upstream water will form a deflection when passing through the water-passing spacings of each row of water distribution gabions and will temporarily stay and accumulate in the space between adjacent rows of water distribution gabions, thereby effectively dissipating energy and slowing down the upstream water flowing to the downstream water body through the water-passing spacing, thereby reducing the scouring of the slope and bottom of the downstream water body.

[0044] A slow-flow gabion 8 is preferably provided in the water-passing spacing, which is used to slow down the flow velocity of water flowing through the water-passing spacing and filter and purify the flowing water. The side walls of the slow-flow gabion (the side walls along the extension direction of the water distribution gabion wall) are respectively tightly attached to the side walls of the water distribution gabion on the corresponding sides, the top surface height of the slow-flow gabion is lower than the top surface height of the water distribution gabion, and the particle size of the built-in stone of the slow-flow gabion is larger than the particle size of the built-in stone of the water distribution gabion. With such arrangement, the water distribution gabion wall can process the incoming water and outgoing water in different ways according to the different incoming water volume and the water storage volume in the stream, and at the same time, filter and purify the incoming water and outgoing water to the maximum extent, and avoid rainwater from being retained in the upstream water body and the stream. Among them, (taking the outgoing water of the dry stream as an example, the ingoing water of the dry stream is the same), when the water level in the stream is lower than the top surface height of the slow-flow gabion, the outgoing water flows through the water distribution gabion and the slow-flow gabion by infiltration, and the outgoing water is decelerated and energy is dissipated and filtered and purified. Since the stone particle size in the slow-flow gabion is larger than that in the water distribution gabion, The stone particle size, the water flow velocity flowing through the slow-flow gabion will be greater than the water flow velocity flowing through the water distribution gabion, so that it can filter and purify all the outflow while reducing the outflow to the greatest extent, and control the water level in the stream; when the water level in the stream is higher than the top surface height of the slow-flow gabion, the upstream water higher than the top surface height of the slow-flow gabion will quickly flow to the downstream water body through the water pass gap (referring to the water pass gap above the slow-flow gabion), so that the water level in the stream is restored to below the top surface height of the slow-flow gabion as quickly as possible, thereby realizing the filtration and purification of the outflow.

[0045] The height of the slow-flow gabion (referring to the height above the ground) can be 1 / 2 or 2 / 3 of the height of the water distribution gabion (referring to the height above the ground).

[0046] The water distribution gabion and the slow-flow gabion are both composed of cage nets and pebbles filled therein. The pebbles built into the water distribution gabion are usually pebbles with a particle size of 60-80 mm, and the pebbles built into the slow-flow gabion are usually pebbles with a particle size of 80 mm-150 mm.

[0047] The two edges of the top of the water distribution gabion and the slow-flow gabion in the front-to-back direction can be reinforced by conformable square steel or angle steel.

[0048] The water distribution gabion wall is provided with a foundation, which preferably includes a plain soil layer 9, a graded crushed stone layer 10 and a concrete layer 11 from bottom to top, wherein the plain soil layer is formed by compacting local plain soil, and the compaction coefficient is not less than 0.93, so as to improve the bearing capacity, the thickness of the graded crushed stone layer is preferably 200 mm, and the concrete layer is cast with C20 plain concrete, and the thickness is preferably 200 mm, so as to enhance the bearing capacity of the foundation.

[0049] The parts of the water distribution gabion and the slow-flow gabion that are in contact with the surrounding bare soil are paved with non-woven fabrics 12 for isolation to prevent bare soil from entering the gabion and causing blockage.

[0050] A preferred implementation of the dry creek is as follows (taking the normal water level of the river around the rainwater storage wetland purification system as zero as the starting point of the elevation):

[0051] Creek body:

[0052] (1) The cross section is inverted trapezoidal, with the stream bottom elevation being -0.1m and the highest water level being 0.3m.

[0053] (2) The slope of the side slope is 1:3, and the stream bottom slopes downward toward the outlet direction (downstream water direction), with a slope of ≥0.3%, but the maximum flow rate shall not exceed 2.0 m / s.

[0054] (3) After the bottom soil is compacted, lay a layer of permeable geotextile.

[0055] (4) Lay 300mm thick pebbles with a particle size of 60-80mm on the geotextile.

[0056] (5) The depth of the aquifer is 300 mm.

[0057] Water distribution gabion wall:

[0058] (1) The top elevation of the first water distribution gabion wall is 0.7m (the highest water level of the upstream water body is 0.7m), and the top elevation of the second water distribution gabion wall is 0.3m.

[0059] (2) The foundation structure of the water distribution gabion wall is plain soil (compaction system not less than 0.93), 200 mm thick graded crushed stone, and 200 mm thick C20 plain concrete.

[0060] (3) The water distribution gabion wall adopts pebble gabions with a thickness of 400 mm, and a 200 mm wide water outlet is set at intervals for water distribution.

[0061] (4) The water distribution gabion is made of galvanized steel wire mesh gabion with a diameter of 3 mm and internal pebbles with a particle size of 60-80 mm.

[0062] (5) A slow-flow gabion is set inside the water inlet. Its height is 1 / 2 of the height of the water distribution gabion. The slow-flow gabion is made of pebbles with the same thickness as the water distribution gabion.

[0063] (6) The slow-flow gabion is made of galvanized steel wire mesh gabion with a diameter of 3 mm and internal pebbles with a particle size of 80-150 mm.

[0064] (7) A layer of non-woven fabric is laid on the contact area between each gabion and the surrounding soil.

[0065] Unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means, all preferred and optional technical means disclosed in the present utility model can be arbitrarily combined to form several different technical solutions.

Claims

1. The dry stream type water flow channel is suitable for the rainwater storage and wetland purification system, which is characterized by A dry creek is used to connect the upstream water body and the downstream water body. A first water distribution gabion wall serving as a water inlet overflow weir is laterally provided at the connection point between the dry creek and the upstream water body, and a second water distribution gabion wall serving as a water outlet overflow weir is laterally provided at the connection point between the dry creek and the downstream water body. Both the first water distribution gabion wall and the second water distribution gabion wall are provided with a low-level water flow channel.

2. The dry stream type water flow channel adapted to the rainwater storage wetland purification system as claimed in claim 1, characterized in that The cross section of the dry creek is an inverted trapezoidal trough structure, and the slope of the side slope is not greater than 1:

3.

3. The dry stream type water flow channel adapted to the rainwater storage wetland purification system as claimed in claim 1, characterized in that The stream bottom slopes downward from the direction opposite to the connection with the downstream water body toward the direction of the connection with the downstream water body.

4. The dry stream type water flow channel adapted to the rainwater storage wetland purification system as claimed in claim 1, characterized in that The stream bottom and the side slope adopt a plain soil bottom layer, a pebble layer is laid on the bottom layer, and a geotextile is laid between the bottom layer and the pebble layer.

5. The dry stream type water flow channel adapted to the rainwater storage and wetland purification system as claimed in claim 1, characterized in that The connection point with the upstream water body is located on the opposite side slope of the connection point with the downstream water body.

6. The dry stream type water flow channel adapted to the rainwater storage wetland purification system as claimed in claim 5, characterized in that An energy dissipation belt is provided downstream of the first water distribution gabion wall in the dry creek. The energy dissipation belt is composed of a stone layer laid on the creek bottom. The stone layer is laid from the inner wall bottom of the first water distribution gabion wall along the slope where it is located to the creek bottom.

7. The dry stream type water flow channel adapted for the rainwater storage wetland purification system according to any one of claims 1 to 6, characterized in that The first water distribution gabion wall and the second water distribution gabion wall have the same structure, both of which are composed of water distribution gabions arranged in rows along the transverse direction. The water distribution gabions are divided into multiple groups along the arrangement direction, and a water-passing spacing is left between adjacent water distribution gabion groups to form the low-level water-passing channel.

8. The dry stream type water flow channel adapted to the rainwater storage wetland purification system as claimed in claim 7, characterized in that The widths of the water-passing spacings of the water distribution gabion walls are the same.

9. The dry stream type water flow channel adapted to the rainwater storage wetland purification system as claimed in claim 7, characterized in that The water distribution gabions constituting the water distribution gabion wall are arranged in a single row or in a plurality of rows along the transverse direction.

10. The dry stream type water flow channel adapted to the rainwater storage wetland purification system as claimed in claim 7, characterized in that A slow-flow gabion is provided in the water-passing spacing, and the side walls of the slow-flow gabion are respectively in close contact with the side walls of the water distribution gabion on the corresponding sides, the top surface height of the slow-flow gabion is lower than the top surface height of the water distribution gabion, and the particle size of the built-in stone of the slow-flow gabion is larger than the particle size of the built-in stone of the water distribution gabion.

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