A slope protection structure capable of collecting non-point source pollution
By incorporating non-point source pollution collection revetment and groove-filled crushed stone filler into the slope revetment structure, combined with a sewage collection system, the problem of poor non-point source pollution control in existing technologies has been solved, achieving efficient and economical pollutant collection and discharge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN MUNICIPAL ENG DESIGN & RES INST
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-31
AI Technical Summary
Existing technologies for treating non-point source pollution, especially non-point source pollution near urban lakes, canals, and other natural water bodies, result in high costs and poor treatment effects for conventional facilities.
Design a slope revetment structure for collecting non-point source pollution, including a concrete coping and a non-point source pollution collection revetment, combined with a sewage collection well and municipal sewage network. By setting grooves on the revetment surface and filling them with crushed stone filler, a connecting channel is formed to collect and discharge into the municipal sewage network.
It achieves a simple structure, convenient construction, efficient collection of non-point source pollution, reduced engineering costs, and improved pollutant collection effect.
Smart Images
Figure CN224578673U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of municipal facilities technology, and in particular to a slope protection structure that can collect non-point source pollution. Background Technology
[0002] Non-point source pollution refers to pollution sources that are dispersed and without fixed emission points, entering the environment through rainwater runoff, atmospheric deposition, and other pathways. Its control requires a combination of source control, engineering measures, and systematic management. During rainfall, pollutants (oil stains, heavy metals, particulate matter) washed and absorbed by rainwater runoff from hardened surfaces (roads, rooftops, etc.) directly enter water bodies through drainage systems, making it the primary source of non-point source pollution. Conventional control measures include intercepting initial rainfall through the installation of sponge city facilities and end-of-line interception systems at drainage outlets.
[0003] However, with rapid urban development, commercial development zones are often established around urban water bodies. The resulting non-point source pollution is carried into the water bodies by rainwater runoff, causing pollution. Conventional sponge city facilities and end-of-line interception facilities are not only costly to implement but also have minimal effect on treating this type of non-point source pollution.
[0004] Therefore, in practical engineering, a more effective non-point source pollution collection device is needed to solve the problem of non-point source pollution control, especially the collection of non-point source pollution from natural water bodies such as lakes and canals near cities. Summary of the Invention
[0005] The technical problem to be solved by this utility model is to provide a slope protection structure that can collect non-point source pollution, addressing the shortcomings of the prior art.
[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A slope protection structure for collecting non-point source pollution includes a concrete capping and multiple non-point source pollution collection type revetments. The concrete capping is set at the edge of the slope top. The non-point source pollution collection type revetments and ordinary revetments are respectively set on the slope surface, and the upper end of the non-point source pollution collection type revetment is connected to the concrete capping. Two adjacent non-point source pollution collection type revetments set in the slope direction overlap each other. The ordinary revetment is set at the end of the non-point source pollution collection type revetment away from the concrete capping, and the upper end of the ordinary revetment is connected to the lower end of the non-point source pollution collection type revetment. A non-point source pollution collection pipe is set below the non-point source pollution collection type revetment in the slope surface. The surface of the non-point source pollution collection type revetment has a groove in the slope direction. The groove is filled with slope gravel filler. The groove is connected to the non-point source pollution collection pipe. The non-point source pollution collection pipe is connected to a sewage collection well. The sewage collection well is connected to a municipal sewage pipe network connection pipe.
[0007] The beneficial effects of this utility model are as follows: The slope protection structure for collecting non-point source pollution of this utility model, by setting multiple non-point source pollution collection type protection structures on the slope and setting grooves on the surface of the non-point source pollution collection type protection structures, and filling the grooves with crushed stone filler, can effectively collect non-point source pollution while solving the slope erosion problem. In conjunction with sewage collection wells and municipal sewage pipe connections, the collected sewage can be discharged into the municipal sewage pipe network. The structure is simple, easy to construct, and has good effect.
[0008] Based on the above technical solution, the present invention can be further improved as follows:
[0009] Furthermore, the non-point source pollution collection revetment is provided with tongue and groove joints at both ends along the slope, and two adjacent non-point source pollution collection revetments are connected by the tongue and groove joints.
[0010] The beneficial effects of the above-mentioned further solution are: by setting tongue and groove joints at both ends of the non-point source pollution collection type revetment, on the one hand, it is convenient to overlap between two adjacent non-point source pollution collection type revetments, and on the other hand, it can minimize the downward infiltration of water and erosion of the slope.
[0011] Furthermore, the surface of the non-point source pollution collection type retaining wall is provided with multiple grooves, and a sewage collection hole is provided at the bottom of the groove in the middle. The sewage collection hole is aligned with and connected to the non-point source pollution collection pipe below.
[0012] The beneficial effect of the above-mentioned further solution is that by setting the groove, it is convenient to fill the surface of the non-point source pollution collection type revetment with gravel filler, while collecting rainwater and forming a communication channel with the non-point source pollution collection pipe below.
[0013] Furthermore, the sewage collection hole is a tongue-and-groove shape with a larger top and a smaller bottom, and the sewage collection hole extends through the thickness direction of the non-point source pollution collection type revetment.
[0014] The beneficial effect of the above-mentioned further solution is that by setting the sewage collection hole to a tongue-and-groove shape with a larger top and a smaller bottom, rainwater can flow into the sewage collection hole through the gravel filler in the groove, which is conducive to the downward flow of water through the sewage collection hole.
[0015] Further: A water-retaining sill is provided at the end of the last row of the non-point source pollution collection revetment along the slope, near the end of the ordinary revetment.
[0016] The beneficial effect of the above-mentioned further solution is that by setting up the water-blocking sill, the polluted rainwater flowing down the slope can be blocked, so that the polluted sewage can flow into the sewage collection pipe along the sewage downpipe, and prevent the polluted water on the slope from flowing directly down the slope.
[0017] Further: The non-point source pollution collection pipe includes a sewage collection pipe, a pipe-encasing concrete, and a sewage downpipe. The pipe-encasing concrete is installed within the slope and located below the non-point source pollution collection type retaining wall. The sewage collection pipe is installed within the pipe-encasing concrete, and the sewage collection pipe has longitudinally spaced circular holes that correspond one-to-one with the number of holes in the non-point source pollution collection type retaining wall. The sewage downpipe is installed within the pipe-encasing concrete, and the upper end of the sewage downpipe extends into the bottom of the central groove and communicates with the sewage collection hole. The lower end of the sewage downpipe communicates with the corresponding circular hole on the sewage collection pipe, and the end of the sewage collection pipe communicates with the sewage collection connection well.
[0018] The beneficial effects of the above-mentioned further solution are: by setting the encasing concrete, the sewage collection pipe can be supported and fixed, and the sewage downpipe is connected to the sewage collection hole and the sewage collection pipe respectively. This facilitates the rainwater flowing from the slope to enter the sewage downpipe through the gravel filler and finally enter the sewage collection well, thereby realizing the collection of non-point source pollution.
[0019] Furthermore, the upper end of the sewage downpipe connected to the sewage collection hole is an inclined end face, and the inclination angle of the end face is the same as the slope angle, and a grating is provided at the upper end of the sewage downpipe.
[0020] The beneficial effects of the above-mentioned further solution are: by setting the upper end of the sewage downpipe to an inclined end face with the same angle as the slope, it is convenient to connect the sewage downpipe to the bottom of the groove and facilitate the flow of water into the sewage downpipe, thereby improving the collection efficiency. The grid can facilitate the falling of crushed stone filler into the sewage downpipe.
[0021] Furthermore, the sewage downpipe is divided into upper and lower sections, with the outer diameter of the upper section being larger than that of the lower section.
[0022] The beneficial effect of the above-mentioned further solution is that by setting the outer diameter of the upper section of the sewage downpipe to be larger than that of the lower section, it is easier for water to enter the sewage downpipe and facilitates the rapid discharge of water.
[0023] Furthermore: the sewage collection pipe is set with a longitudinal slope, and the longitudinal slope is not less than 0.05%.
[0024] The beneficial effect of the above-mentioned further solution is that setting a longitudinal slope facilitates the smooth discharge of rainwater entering the sewage collection pipe into the sewage collection well.
[0025] Furthermore, a sewage collection control valve is installed at the end of the sewage collection pipe.
[0026] The beneficial effects of the above-mentioned further solution are: by setting the sewage collection control valve, it is convenient to close the sewage collection control valve when the pollutant concentration in the rainwater runoff collected by the sewage collection pipe is low, stop the collection of rainwater runoff, and discharge it directly into natural water bodies; when the pollutant concentration in the rainwater runoff collected by the sewage collection pipe is high, it can be opened to collect sewage and discharge it into the municipal sewage pipe network, thus facilitating diversion. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of a slope protection structure capable of collecting non-point source pollution according to an embodiment of the present invention.
[0028] Figure 2 This utility model Figure 1 A schematic diagram of the AA cross-sectional structure;
[0029] Figure 3 This is a schematic diagram of the planar structure of a type A surface source pollution collection revetment according to an embodiment of the present invention;
[0030] Figure 4 This utility model Figure 3 A schematic diagram of the BB cross-sectional structure;
[0031] Figure 5 This utility model Figure 3 Schematic diagram of CC cross-section structure;
[0032] Figure 6 This utility model Figure 3 Schematic diagram of the DD cross-sectional structure;
[0033] Figure 7 This is a schematic diagram of the planar structure of a type B surface source pollution collection revetment according to an embodiment of the present invention;
[0034] Figure 8 This is a schematic diagram of the planar structure of a type B surface source pollution collection revetment according to an embodiment of the present invention;
[0035] Figure 9 This is a schematic diagram of the planar structure of a conventional retaining wall according to an embodiment of the present invention;
[0036] Figure 10 This is a schematic diagram of the planar structure of a sewage collection and treatment well according to an embodiment of the present invention;
[0037] Figure 11 This utility model Figure 10 A schematic diagram of the EE cross-sectional structure.
[0038] The attached diagram lists the components represented by each number as follows:
[0039] 1. Concrete capping; 2. Non-point source pollution collection type revetment; 3. Crushed stone filler; 4. Non-point source pollution collection pipe; 5. Ordinary revetment; 6. Sewage collection combined well; 7. Sewage collection control valve; 8. Municipal sewage network connection pipe.
[0040] 2-1. Type A non-point source pollution collection revetment; 2-2. Type B non-point source pollution collection revetment; 2-3. Type C non-point source pollution collection revetment; 4-1. Sewage collection pipe; 4-2. Pipe-encasing concrete; 4-3. Sewage downpipe. Detailed Implementation
[0041] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.
[0042] like Figure 1 , 2 As shown in Figures 9-11, a slope protection structure capable of collecting non-point source pollution includes a concrete coping 1 and multiple non-point source pollution collecting revetments 2. The concrete coping 1 is located at the edge of the slope crest. The non-point source pollution collecting revetments 2 and ordinary revetments 5 are respectively located on the slope surface, with the upper end of the non-point source pollution collecting revetments 2 connected to the concrete coping 1. Adjacent non-point source pollution collecting revetments 2 arranged along the slope direction overlap each other. The ordinary revetments 5 are located away from the non-point source pollution collecting revetments 2. One end of the concrete capping 1, and the upper end of the ordinary retaining wall 5 is connected to the lower end of the non-point source pollution collection type retaining wall 2. A non-point source pollution collection pipe 4 is installed below the non-point source pollution collection type retaining wall 2 in the slope surface. A groove is provided on the surface of the non-point source pollution collection type retaining wall 2 along the slope direction. The groove is filled with slope gravel filler 3. The groove is connected to the non-point source pollution collection pipe 4. The non-point source pollution collection pipe 4 is connected to the sewage collection well 6. The sewage collection well 6 is connected to the municipal sewage pipe network connection pipe 8.
[0043] This utility model discloses a slope protection structure for collecting non-point source pollution. By setting multiple non-point source pollution collection type revetments 2 on the slope and setting grooves on the surface of the non-point source pollution collection type revetments 2, and filling the grooves with crushed stone filler 3, it can effectively collect non-point source pollution while solving the slope erosion problem. In conjunction with the sewage collection well 6 and the municipal sewage network connection pipe 8, the collected sewage can be discharged into the municipal sewage network. The structure is simple, easy to construct, and has good effect.
[0044] In one or more embodiments of this utility model, the concrete capping 1 is a cast-in-place concrete structure with a cross-sectional dimension of 0.3m × 0.5m.
[0045] In one or more embodiments of this utility model, tongue and groove joints are respectively provided at both ends of the non-point source pollution collection revetment 2 along the slope, and adjacent non-point source pollution collection revetment 2 are connected by the tongue and groove joints. By providing tongue and groove joints at both ends of the non-point source pollution collection revetment 2, it is possible to facilitate the connection between adjacent non-point source pollution collection revetment 2, and at the same time, it can minimize the downward infiltration of water and erosion of the slope.
[0046] In one or more embodiments of this utility model, the surface of the non-point source pollution collection revetment 2 is provided with multiple grooves, and a sewage collection hole is provided at the bottom of the groove located in the middle. The sewage collection hole is aligned with and connected to the non-point source pollution collection pipe 4 below. By providing the grooves, it is convenient to fill the surface of the non-point source pollution collection revetment 2 with gravel filler 3, while collecting rainwater and forming a communication channel with the non-point source pollution collection pipe 4 below.
[0047] In one or more embodiments of this utility model, the non-point source pollution collection revetment 2 is classified into type A non-point source pollution collection revetment 2-1, type B non-point source pollution collection revetment 2-2, and type C non-point source pollution collection revetment 2-3 according to their different usage locations, such as... Figures 3 to 8 As shown, each type of non-point source pollution collection revetment has a groove in the middle of the surface along the slope direction. The groove size b2×h1 is 0.1m×0.1m, and the groove is filled with crushed stone filler.
[0048] The top row of non-point source pollution collection revetment 2 is Type A non-point source pollution collection revetment 2-1. Type A non-point source pollution collection revetment 2-1 is a precast component, a rectangular precast block structure with planar dimensions b×a of 0.5m×0.6m, and a thickness h of 0.12m. Figure 3-6 As shown.
[0049] The non-point source pollution collection revetment 2 located in the middle row is a type B non-point source pollution collection revetment 2-2. Unlike the type A non-point source pollution collection revetment 2-1, the type B non-point source pollution collection revetment 2-2 adds a circular sewage collection hole to the type A non-point source pollution collection revetment 2-1, such as... Figure 7 As shown. The circular sewage collection hole is located in the central groove. The collection hole is tongue-and-groove shaped, with the upper collection hole being larger at the top and smaller at the bottom. The upper collection hole is a circular hole with a diameter of 0.06m and a height of 0.01m, while the lower collection hole is usually a circular hole with a diameter of 0.05m. The centers of the upper and lower collection holes coincide and are connected, running through the entire thickness direction of the B-type non-point source pollution collection revetment 2-2. This facilitates rainwater flowing into the sewage collection hole through the gravel filler 3 in the groove, and promotes the downward flow of water through the sewage collection hole.
[0050] The bottom row of non-point source pollution collection revetment 2 is a Type C non-point source pollution collection revetment 2-3. Type C non-point source pollution collection revetment 2-3 is based on Type B non-point source pollution collection revetment 2-2, with the addition of a water-retaining sill. The water-retaining sill is located at the end of Type C non-point source pollution collection revetment 2-3, with a height of 0.12m and a thickness of 0.08m. Figure 8 As shown. By setting up the water-blocking sill, polluted rainwater flowing down the slope can be blocked, so that polluted sewage can flow down the sewage downpipe 4-3 into the sewage collection pipe 4-1, preventing polluted water on the slope from flowing directly down the slope.
[0051] In one or more embodiments of this utility model, the slope gravel filler 3 is filled in the slope-oriented groove in the middle of the non-point source pollution collection type retaining wall 2, and the particle size is 10mm-20mm, and the texture is hard and unweathered.
[0052] In one or more embodiments of this utility model, the non-point source pollution collection pipe 4 includes a sewage collection pipe 4-1, a pipe-encasing concrete 4-2, and a sewage downpipe 4-3. The pipe-encasing concrete 4-2 is disposed within the slope and located below the non-point source pollution collection type retaining wall 2. The sewage collection pipe 4-1 is disposed within the pipe-encasing concrete 4-2. The sewage collection pipe 4-1 has longitudinally spaced circular holes that are the same number as those of the non-point source pollution collection type retaining wall 2 and correspond one-to-one. The sewage downpipe 4-3 is disposed within the pipe-encasing concrete 4-2, and the upper end of the sewage downpipe 4-3 extends into the bottom of the groove in the middle and communicates with the sewage collection hole. The lower end of the sewage downpipe 4-3 communicates with the corresponding circular hole on the sewage collection pipe 4-1. The end of the sewage collection pipe 4-1 communicates with the sewage collection connection well 6. The concrete 4-2 can support and fix the sewage collection pipe 4-1. The sewage downpipe 4-3 is connected to the sewage collection hole and the sewage collection pipe 4-1 respectively. This allows rainwater flowing from the slope to pass through the gravel filler 3 and enter the sewage downpipe 4-3, and finally enter the sewage collection well 6, thus realizing the collection of non-point source pollution.
[0053] Here, the sewage collection pipe 4-1 is a PE pipe with a diameter of 0.2m. Furthermore, the sewage collection pipe 4-1 has longitudinally spaced circular holes with a diameter of 0.05m and a longitudinal spacing of 0.5m. The pipe-encasing concrete 4-2 is a cast-in-place concrete structure with a trapezoidal cross-section, a width of 0.8m, and a bottom elevation that is 0.3m lower than the elevation of the sewage collection pipe 4-1. The top extends to the bottom of the surface source collection type retaining wall 2. The sewage downpipe 4-3 is made of PVC. Furthermore, the sewage downpipe is divided into two sections: the upper section has an outer diameter of 0.06m and a height of 0.01m, and the lower section has an outer diameter of 0.05m; the upper and lower sections are connected as a single unit.
[0054] In one or more embodiments of this utility model, the upper end of the sewage downpipe 4-3 that connects to the sewage collection hole is an inclined end face, and the inclination angle of the end face is the same as the slope angle. A grating is provided at the upper end of the sewage downpipe 4-3. By setting the upper end of the sewage downpipe 4-3 as an inclined end face with the same slope angle, it is convenient to connect the sewage downpipe 4-3 to the bottom of the groove, and it facilitates water flow into the sewage downpipe 4-3, improving collection efficiency. The grating allows the crushed stone filler 3 to fall into the sewage downpipe 4-3 easily. Here, the grating is a PVC grating with a grating spacing of 8mm. In practice, the sewage downpipe 4-3 needs to be installed first when pouring the pipe-encasing concrete 4-2.
[0055] Optionally, in one or more embodiments of this utility model, the sewage downpipe 4-3 is divided into upper and lower sections, with the outer diameter of the upper section being larger than that of the lower section. By setting the outer diameter of the upper section of the sewage downpipe 4-3 to be larger than that of the lower section, it is easier for water to enter the sewage downpipe 4-3, which facilitates rapid drainage.
[0056] In one or more embodiments of this utility model, the sewage collection pipe 4-1 is provided with a longitudinal slope, and the longitudinal slope is not less than 0.05%. Providing a longitudinal slope facilitates the smooth discharge of rainwater entering the sewage collection pipe 4-1 into the sewage collection well 6.
[0057] In one or more embodiments of this utility model, the ordinary retaining wall 5 is a precast component, a rectangular precast block structure with a planar dimension b×a of 0.5m×0.6m and a thickness h of 0.12m. Furthermore, the ordinary retaining wall 5 is provided with a tongue and groove joint along the slope, with a tongue and groove dimension a1×h / 2 of 0.1m×0.06m, allowing two vertically adjacent ordinary retaining walls to overlap.
[0058] In addition, the non-point source pollution collection type revetment 2 is located at a position higher than the design water level + safety freeboard 0.5m.
[0059] In one or more embodiments of this utility model, the sewage collection well 6 is a rectangular concrete structure with a planar dimension of 0.8m along the outer edge of the sewage collection pipe 4-1 and 2.0m along the direction of the sewage collection pipe 4-1.
[0060] In one or more embodiments of this utility model, a sewage collection control valve 7 is provided at the end of the sewage collection pipe 4-1. By providing the sewage collection control valve 7, it is convenient to close the sewage collection control valve 7 when the pollutant concentration in the rainwater runoff collected by the sewage collection pipe 4-1 is low, stop the collection of rainwater runoff, and discharge it directly into natural water bodies; and to open the valve when the pollutant concentration in the rainwater runoff collected by the sewage collection pipe 4-1 is high, so as to collect sewage and discharge it into the municipal sewage pipe network, thus facilitating diversion.
[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A slope revetment structure capable of collecting non-point source pollution, characterized by: The structure includes a concrete capping (1) and multiple non-point source pollution collection revetments (2). The concrete capping (1) is located at the edge of the slope top. The non-point source pollution collection revetments (2) and ordinary revetments (5) are respectively located on the slope surface. The upper end of the non-point source pollution collection revetments (2) is connected to the concrete capping (1). Two adjacent non-point source pollution collection revetments (2) arranged along the slope direction overlap each other. The ordinary revetments (5) are located at the end of the non-point source pollution collection revetments (2) away from the concrete capping (1). The upper end of the revetment (5) is connected to the lower end of the non-point source pollution collection revetment (2). A non-point source pollution collection pipe (4) is installed below the non-point source pollution collection revetment (2) on the slope. A groove is provided on the surface of the non-point source pollution collection revetment (2) along the slope direction. The groove is filled with slope gravel filler (3). The groove is connected to the non-point source pollution collection pipe (4). The non-point source pollution collection pipe (4) is connected to the sewage collection well (6). The sewage collection well (6) is connected to the municipal sewage pipe network connection pipe (8).
2. The slope revetment structure capable of collecting non-point source pollution according to claim 1, characterized in that: The non-point source pollution collection type revetment (2) is provided with tongue and groove joints at both ends along the slope, and two adjacent non-point source pollution collection type revetments (2) are connected by the tongue and groove joints.
3. The slope revetment structure capable of collecting non-point source pollution according to claim 2, characterized in that: The surface of the non-point source pollution collection type retaining wall (2) is provided with multiple grooves, and a sewage collection hole is provided at the bottom of the groove in the middle. The sewage collection hole is aligned with and connected to the non-point source pollution collection pipe (4) below.
4. The slope revetment structure capable of collecting non-point source pollution according to claim 3, characterized in that: The sewage collection hole is a tongue-and-groove shape, wider at the top and narrower at the bottom, and extends through the thickness of the non-point source pollution collection revetment.
5. The slope revetment structure capable of collecting non-point source pollution according to claim 3, characterized in that: A water-retaining sill is provided at one end of the non-point source pollution collection type revetment (2) along the last row of the slope, near the end of the ordinary revetment (5).
6. The slope protection structure for collecting non-point source pollution according to claim 3, characterized in that: The non-point source pollution collection pipe (4) includes a sewage collection pipe (4-1), a pipe-encasing concrete (4-2), and a sewage downpipe (4-3). The pipe-encasing concrete (4-2) is set inside the slope and located below the non-point source pollution collection type retaining wall (2). The sewage collection pipe (4-1) is set inside the pipe-encasing concrete (4-2). The sewage collection pipe (4-1) has the same number of circular holes as the non-point source pollution collection type retaining wall (2) arranged longitudinally and corresponding one-to-one. The sewage downpipe (4-3) is set inside the pipe-encasing concrete (4-2), and the upper end of the sewage downpipe (4-3) extends into the bottom of the groove in the middle and communicates with the sewage collection hole. The lower end of the sewage downpipe (4-3) communicates with the corresponding circular hole on the sewage collection pipe (4-1). The end of the sewage collection pipe (4-1) is connected to the sewage collection well (6).
7. The slope revetment structure that can collect area source pollution according to claim 6, characterized in that: The upper end of the sewage downpipe (4-3) connected to the sewage collection hole is an inclined end face, and the inclination angle of the end face is the same as the slope angle. A grid is provided at the upper end of the sewage downpipe (4-3).
8. The slope revetment structure that can collect area source pollution according to claim 7, characterized in that: The sewage downpipe (4-3) is divided into upper and lower sections, with the outer diameter of the upper section being larger than that of the lower section.
9. The slope revetment structure that can collect area source pollution according to claim 6, characterized in that: The sewage collecting pipe (4-1) is longitudinally provided with a slope, and the longitudinal slope is not less than 5 / 10000.
10. The slope protection structure for collecting non-point source pollution according to claim 6, characterized in that: An end of the sewage collecting pipe (4-1) is provided with a sewage collecting control valve (7).