Sponge city construction post-city drainage pipe network resilience acquisition method

Abstract

The present application provides a kind of sponge city construction city drainage pipe network flexibility acquisition method, including collection data, using ring cutter method experiment obtains the Holtan soil infiltration parameter of study area, according to the distribution of pipe inspection well, utilize the tessellation polygon to divide sub catchment, the runoff of each sub catchment is distributed to corresponding inspection well, constructs SWMM model, according to the characteristics of impervious surface distribution in study area, set different sponge facility construction area ratio, determine different sponge facility construction scheme, obtain the flexibility of city drainage pipe network under different sponge facility construction scheme.The present application considers the sponge city construction, the flexibility acquisition method of quantifying city drainage pipe network, obtains the change condition of the flexibility of city drainage pipe network under different sponge city construction planning condition.

Description

Technical Field

[0001] This invention relates to the field of urban stormwater management technology, specifically to a method for obtaining the resilience of urban drainage pipe networks after the construction of sponge cities. Background Technology

[0002] In recent years, many countries and regions have faced urban water problems, such as urban flooding and urban water pollution. To address these problems, urban water resource resilience management strategies have been proposed, mainly including two types. The first type consists of structural measures in urban stormwater management, such as urban drainage systems and green infrastructure systems; the other type mainly consists of non-structural measures, such as adaptive governance and social learning.

[0003] In the early stages of sponge city construction, many studies focused primarily on runoff control rates and pollutant control rates. However, with the continuous development of sponge city construction theory, many scholars believe that sponge cities can mitigate or reduce the impact of natural disasters and environmental changes, exhibiting good resilience. The construction of green infrastructure such as sponge facilities alters hydrological processes, thereby affecting the resilience of urban drainage networks. Therefore, based on current sponge city theory and in conjunction with sponge-based transformation, clarifying the mechanism by which sponge facilities affect the resilience of urban drainage networks is a key issue in achieving seamless integration between sponge facilities and urban drainage systems.

[0004] The development of the concept of resilience can be broadly divided into three stages: engineering resilience, ecological resilience, and socio-ecological resilience. Canadian scholar Holling first defined engineering resilience as "the ability of a system to return to equilibrium or a stable state after being disturbed." In recent years, quantitative assessment of resilience has been a key focus of urban stormwater management. These studies, based on whether they consider the impact of external environments (such as rapid urbanization or climate change), can be broadly categorized into two types. The first type ignores the impact of external environmental changes and constructs an indicator system encompassing social, ecological, infrastructure, economic, institutional, and disaster aspects to study current flood management strategies and their effectiveness in reducing flood losses and assessing flood resilience. The second type focuses on the resilience of urban drainage systems under the intensification of urbanization or climate change. Climate change and urbanization may lead to more system failures and threaten human life and property. If urban planners and designers ignore external environmental factors such as urbanization or climate change, the design standards of urban drainage systems will increase the probability of urban flood disasters.

[0005] At present, with the continuous deepening of the construction of sponge cities, resilience has become one of the important characteristics of sponge city construction in my country. However, the current calculation method of urban drainage system resilience ignores the impact of the connection between sponge facilities and drainage pipe network on the resilience of urban drainage system, which can no longer meet the calculation needs. Therefore, it is urgent to propose a method to quantify the resilience of urban drainage pipe network after considering the construction of sponge cities. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method for obtaining the resilience of urban drainage pipe networks after the construction of sponge cities. This method quantifies the acquisition of urban drainage pipe network resilience after the construction of sponge cities, and obtains information that reflects the changes in urban drainage pipe network resilience under different sponge city construction planning scenarios.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention provides a method for obtaining the resilience of urban drainage pipe networks after sponge city construction, comprising the following steps: Data were collected, and the Horton soil infiltration parameters in the study area were determined using the ring sampler method. Based on the distribution of pipeline manholes, Thiessen polygons are used to divide sub-catchments, and the runoff of each sub-catchment is allocated to the corresponding pipeline manholes to construct an SWMM model. Based on the SWMM model and the characteristics of the impermeable surface distribution in the study area, the area proportion of different sponge facilities is set, and different sponge facility construction schemes are determined. To obtain the resilience of urban drainage networks under different sponge city infrastructure construction schemes.

[0008] Furthermore, the data includes topographic data of the study area, the current distribution and area of ​​various underlying surfaces, current land use, urban drainage network, distribution of manholes and their lengths, diameters, and burial depths, soil type zoning, and the spatiotemporal distribution of rainfall.

[0009] Furthermore, the ring-blade method experiment includes the following steps: Soil samples were collected using a ring cutter. Record the amount of water infiltrated into the soil sample inside the ring cutter; The experimental data were fitted with parameters according to the Horton infiltration formula to obtain the Horton soil infiltration parameters.

[0010] Furthermore, the method for collecting soil samples using a ring sampler is as follows: Before sampling, prepare a clean ring cutter and level the ground at the sampling point. Then, firmly drive the prepared ring cutter into the soil. After the soil column emerges from the top of the ring cutter, use a shovel to dig away the surrounding soil. Next, remove the ring cutter filled with soil and use a soil cutter to remove the excess soil on both sides so that the volume of soil inside the ring cutter is equal to the volume of the ring cutter. Cover the bottom and top covers, bring it back indoors to weigh it, and collect one sample each from 0~20 cm and 20~40 cm. Collect at least two samples from each sampling point.

[0011] Furthermore, the method for recording the amount of water infiltrating into the soil sample within the ring cutter is as follows: Soak the ring cutter with its original soil in clean water for a certain period of time. Remove the top cap of the ring cutter and attach it to a clean, uncovered ring cutter with tape. Place the empty ring cutter on top and fix the attached ring cutter above the funnel. Add water to the ring cutter to maintain a certain water layer thickness. Place an empty beaker below the funnel to collect the water. The timing begins when the first drop of water is dripped into the ring cutter, and the thickness of the water layer inside the ring cutter remains constant throughout the experiment. Record the infiltration volume at 1, 2, 3, 5, 10, 15, ..., 45, 60, 75, and 90 min.

[0012] Furthermore, the Horton infiltration formula is:

[0013] In the formula, Indicates the infiltration rate; Indicates the steady infiltration rate; Indicates the initial infiltration rate; Indicates the total infiltration time; It represents a constant determined based on soil properties.

[0014] Furthermore, the method for constructing the SWMM model is as follows: Create a .shp file, convert it to an .inp file, and import it into SWMM.

[0015] Furthermore, the shapefile includes sub-catchment files, pipe files, manhole details, and outlet files; The sub-catchment file includes the following attributes: sub-catchment name, rain gauge number, outlet, area, slope, width, percentage of impermeable area, N-impermeable area, N-permeable area, impermeable area storage depth, permeable area storage depth, infiltration mode, and Horton soil infiltration parameters. The pipe file includes the following attributes: pipe name, inlet, outlet, shape, maximum depth, length, and Manning coefficient. The attributes included in the inspection well node and outlet files are: node name, node elevation, maximum burial depth; outlet name, elevation, and outflow method.

[0016] Furthermore, in setting the area proportion of different sponge facilities, based on the characteristics of the distribution of impermeable surfaces in the land use of the study area, according to the runoff path, the impermeable surface directly connected to the outlet is defined as the directly impermeable surface, and the impermeable area directly connected to the permeable surface is defined as the indirectly connected impermeable surface. When the directly connected impermeable area exceeds a certain percentage of the area of ​​the sub-catchment area, the sub-catchment area is selected to set up sponge facilities, with the principle of only laying permeable paving on impermeable roads and laying rain gardens and sunken green spaces in green spaces.

[0017] Furthermore, the method for obtaining the resilience of urban drainage networks under different sponge city infrastructure construction schemes is as follows: Determine the total flood volume before the construction of sponge cities under extreme rainfall conditions. The runoff controlled by sponge city facilities ; This indicates the total overflow volume of the drainage network that causes disasters after the construction of a sponge city; Determine the overflow duration of nodes without sponge city construction under extreme rainfall conditions. Overflow duration at nodes after sponge city construction ; The time difference represents the average duration of overflow at drainage network nodes after the construction of a sponge city; The resilience of urban drainage networks under different sponge city construction schemes can be calculated using the following formula:

[0018] in, This indicates the runoff volume controlled by the sponge city infrastructure. This indicates the overflow duration at each node after the construction of a sponge city. This indicates the time difference of the average duration of overflow at drainage network nodes after the construction of a sponge city; before the construction of a sponge city, Equal to 0, equal The resilience of urban drainage networks is not affected by sponge city construction; after the construction of sponge cities, Increase The capacity also increases, and the resilience of the urban drainage network also increases accordingly.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention proposes a method for obtaining the resilience of urban drainage pipe networks after the construction of sponge cities. It considers the construction of sponge cities and quantifies the method for obtaining the resilience of urban drainage pipe networks, so as to obtain the changes in the resilience of urban drainage pipe networks under different sponge city construction planning conditions, thereby solving the problem of how to achieve the optimal connection between sponge facilities and urban drainage systems. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are intended to explain the invention, but do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a flowchart of the method for obtaining the resilience of urban drainage pipe network after the construction of sponge cities according to the present invention.

[0021] Figure 2 This is a flowchart illustrating the calculation of the resilience of urban drainage pipe networks after the construction of sponge cities, as presented in this invention.

[0022] Figure 3 The theoretical system performance curve changes of the urban drainage system after the construction of sponge cities.

[0023] Figure 4 The rainfall in City A over a 2-hour period, with 10-minute intervals, is the Chicago-style rain pattern. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Current methods for calculating the resilience of urban drainage systems neglect the impact of the connection between sponge city facilities and drainage pipe networks on the resilience of urban drainage systems. This invention provides a method for obtaining the resilience of urban drainage pipe networks after the construction of sponge cities, which can reflect the changes in the resilience of urban drainage pipe networks under different sponge city construction plans, thereby solving the problem of how to achieve the optimal connection between sponge city facilities and urban drainage systems.

[0026] This invention provides a method for obtaining the resilience of urban drainage pipe networks after sponge city construction, such as... Figure 1 and Figure 2 As shown, it includes the following steps: Step 1: Collect data and use the ring sampler method to obtain the soil infiltration parameters of the study area in Horton. Step 2: Based on the distribution of pipeline manholes, use Thiessen polygons to divide the sub-catchments, allocate the runoff of each sub-catchment to the corresponding pipeline manholes, and construct the SWMM model. Step 3: Based on the SWMM model and the characteristics of the impermeable surface distribution in the study area, set the area proportion of different sponge facilities construction and determine different sponge facility construction schemes. Step 4: Obtain the resilience of urban drainage networks under different sponge city infrastructure construction schemes.

[0027] This invention proposes a method for obtaining the resilience of urban drainage pipe networks after the construction of sponge cities. It considers the construction of sponge cities and quantifies the method for obtaining the resilience of urban drainage pipe networks, so as to obtain the changes in the resilience of urban drainage pipe networks under different sponge city construction planning conditions, thereby solving the problem of how to achieve the optimal connection between sponge facilities and urban drainage systems.

[0028] In this invention, data is collected through surveys, borrowing materials, and other means. The data includes topographic data of the study area, the current distribution and area of ​​various underlying surfaces, the current land use status, urban drainage pipe network, distribution of inspection wells and the distribution of pipe network sections with length, diameter, and burial depth, soil type zoning, and the spatiotemporal distribution of rainfall.

[0029] In this invention, the ring cutter method experiment includes the following steps: Step 101: Collect soil samples using a ring cutter; Step 102: Record the amount of water infiltrated into the soil sample inside the ring cutter.

[0030] Step 103: Fit the experimental data to the Horton infiltration formula to obtain the Horton soil infiltration parameters.

[0031] The method for collecting soil samples using a ring sampler is as follows: Prepare a clean container with a volume of 100 cm² before sampling. 3 The sampling process involved: First, leveling the ground at the sampling point. Then, firmly driving the prepared ring sampler into the soil. Once the soil column emerged from the top of the ring sampler, the surrounding soil was removed with a shovel. Next, the ring sampler filled with soil was removed, and excess soil on both sides was removed using a soil trimmer to ensure the volume of soil inside the ring sampler equals its volume. Finally, the bottom and top covers were replaced, and the sample was taken indoors and weighed. Two samples were collected from each sampling point: one from 0–20 cm and one from 20–40 cm.

[0032] The method for recording the amount of water infiltrating into the soil sample inside the ring cutter is as follows: Soak the ring cutter with its original soil intact, collected from the field, in clean water for 24 hours. Remove the top cap of the ring cutter and attach it to a clean, uncovered ring cutter using adhesive tape, placing the empty ring cutter on top. Secure the attached ring cutter above the funnel and prepare a measuring cylinder, stopwatch, empty beaker, and other equipment. Add water to the ring cutter, maintaining a water layer thickness of 3 cm, and place the empty beaker below the funnel to collect the water. The timing begins when the first drop of water is dripped into the ring cutter, and the thickness of the water layer inside the ring cutter remains constant throughout the experiment. Record the infiltration volume at 1, 2, 3, 5, 10, 15, ..., 45, 60, 75, and 90 min.

[0033] The Horton infiltration formula is:

[0034] In the formula, This indicates the infiltration rate, expressed in cm / min. This represents the steady-state infiltration rate, expressed in cm / min. This indicates the initial infiltration rate, expressed in cm / min. This represents the total infiltration time, in minutes. It represents a dimensionless constant determined based on soil properties.

[0035] In this invention, in step 2, the collected data is imported into GIS, and the Thiessen polygons are used to divide the sub-catchment areas according to the distribution of pipeline inspection wells. The runoff of each catchment area is allocated to the corresponding inspection wells, and the prepared shp file is converted into an inp file and imported into SWMM.

[0036] Specifically, the method for constructing the SWMM model is as follows: Create a .shp file, convert it to an .inp file, and import it into SWMM.

[0037] The shapefile includes sub-catchment files, pipe files, manhole details, and outlet files; The sub-catchment file includes the following attributes: sub-catchment name, rain gauge number, outlet, area, slope, width, percentage of impermeable area, N-impermeable area, N-permeable area, impermeable area storage depth, permeable area storage depth, infiltration mode, and Horton soil infiltration parameters.

[0038] The pipe file includes the following attributes: pipe name, inlet, outlet, shape, maximum depth, length, and Manning coefficient. The attributes included in the inspection well node and outlet files are: node name, node elevation, maximum burial depth; outlet name, elevation, and outflow method.

[0039] In this invention, in step 3, as follows Figure 2 As shown, based on the SWMM model and the characteristics of impermeable surface distribution in the study area, according to the runoff path, the impermeable surface directly connected to the outlet is defined as the direct impermeable surface, and the impermeable area directly connected to the permeable surface is defined as the indirectly connected impermeable surface. When the directly connected impermeable area exceeds 60% of the sub-catchment area, the sub-catchment area is selected for the installation of sponge facilities. Based on the principle of only laying permeable paving on impermeable roads and placing rain gardens and sunken green spaces in green spaces, the area ratio of different sponge facility construction is set, and different sponge facility construction schemes are determined.

[0040] In this invention, the method for obtaining the resilience of urban drainage pipe networks under different sponge city infrastructure construction schemes in step 4 is as follows: Step 401: Determine the total flood volume under extreme rainfall conditions before the construction of a sponge city. The unit is m 3 The runoff controlled by sponge city facilities The unit is m 3 Total overflow of drainage pipe network causing disasters after sponge city construction The unit is m 3 .

[0041] Step 402, as follows Figure 3 As shown, the overflow duration of nodes without sponge city construction was determined under extreme rainfall conditions. The unit is hours (h); the overflow duration of nodes after the construction of sponge cities. The unit is h; The time difference, expressed in hours, represents the average duration of overflow at drainage network nodes after the construction of a sponge city.

[0042] Step 403: Calculate the resilience of urban drainage networks under different sponge city construction schemes according to the following formula.

[0043]

[0044] in, This indicates the runoff volume controlled by the sponge city facility, in meters (m³). 3 ; This indicates the overflow duration of a node after the construction of a sponge city, expressed in hours (h). This represents the time difference in hours (h) indicating the average duration of overflow at drainage network nodes after the construction of a sponge city; before the construction of a sponge city... Equal to 0, equal The resilience of urban drainage networks is not affected by sponge city construction; after the construction of sponge cities, Increase The capacity also increases, and the resilience of the urban drainage network also increases accordingly.

[0045] In summary, the method for obtaining the resilience of urban drainage networks after the construction of sponge cities provided by this invention improves the calculation method of urban drainage network resilience from both spatial and temporal dimensions by considering the storage capacity of sponge facilities. In the temporal dimension, by introducing the overflow duration of nodes before and after sponge city construction, the time difference of the average overflow duration of drainage network nodes after sponge city construction is obtained. Considering the slowed runoff transport caused by sponge city construction, the peak flood time can be effectively delayed. In the spatial dimension, by introducing the runoff controlled by sponge facilities and the total disaster-causing overflow of the drainage network after sponge city construction, the traditional "rapid drainage" mode is changed by sponge city construction, making full use of the function of sponge facilities to retain rainwater. The advantage of this invention lies in: combining the construction of sponge cities with significant needs and quantifying the impact of sponge facilities on the resilience of urban drainage networks. Furthermore, compared with existing sponge city hydrological calculation methods and technologies, this invention comprehensively considers the impact of water volume and time into the resilience calculation of urban drainage pipe networks, providing optimized indicators for the connection between sponge facilities and drainage pipe networks, and also providing technical support for the construction of sponge cities.

[0046] In one specific embodiment of the present invention, the method of the present invention has been applied to urban stormwater management in City A, and the specific steps are as follows: Step 1: Collect data on the distribution and area of ​​the underlying surface in City A, drainage network node data, and the temporal distribution of rainfall over a 2-hour period, such as... Figure 4 As shown, the Horton soil infiltration parameters for City A were determined. Table 1. Underlying surface data for City A

[0047] Table 2. Parameter values ​​for Horton infiltration curves

[0048] Step 2: Based on the above method, the catchment area is divided into multiple sub-catchments, totaling 27 sub-catchments, 31 nodes, 31 pipes, and 7 drainage outlets. In the constructed SWMM model, the infiltration is calculated using the Horton model in the hydrological module, with parameters mainly as shown in the table above. Surface runoff is calculated using the Manning formula. In the hydrodynamic module of the pipe network simulation, dynamic waves are mainly used to calculate the water flow evolution in the pipes.

[0049] Step 3: A total of 6 construction schemes were set up, as shown in Table 3.

[0050] Table 3. Different Sponge City Construction Schemes

[0051] Step 4: Determine the total flood volume under extreme rainfall conditions before the construction of a sponge city. m 3 The runoff controlled by sponge city facilities m 3 ; This represents the total overflow volume (m) of the drainage network after the construction of a sponge city, which is considered to cause disasters. 3 ; The model simulation can reveal the changes in various flood volumes and times for the original plan and the six sponge city construction plans, as shown in Tables 4 and 5.

[0052] Table 4. Runoff Analysis for Various Sponge City Construction Schemes (Unit: m) 3

[0053] Determine the overflow duration of nodes without sponge city construction under extreme rainfall conditions. h; Overflow duration at nodes after sponge city construction , h; The time difference, h, represents the average duration of overflow at drainage network nodes after the construction of a sponge city.

[0054] Table 5. Overflow Time Analysis for Various Sponge City Construction Schemes (Unit: h)

[0055] Based on the analysis of various flood volumes and overflow times, the final result of the urban drainage network resilience after considering sponge city construction is obtained through the resilience calculation formula. The resilience values ​​of Scheme 1 to Scheme 6 are 0.310, 0.312, 0.339, 0.347, 0.370 and 0.394, respectively. The calculation results show that as the sponge city construction area is larger, the sponge facilities control more runoff, the node overflow time is longer, and the resilience increases accordingly.

[0056] As can be seen from the above calculation method, this method takes into account the runoff storage effect after the construction of sponge cities into the calculation of the resilience of urban drainage pipe networks. It provides a reference for optimizing the connection between sponge facilities and drainage pipe networks, which is of great significance to the construction of sponge cities in my country. It is a quantitative method for urban drainage pipe network resilience that conforms to the actual situation of sponge city construction in China.

[0057] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for obtaining the resilience of urban drainage pipe network after sponge city construction, characterized in that, Includes the following steps: Data were collected, and the Horton soil infiltration parameters of the study area were obtained using the ring sampler method. Based on the distribution of pipeline manholes, Thiessen polygons are used to divide sub-catchments, and the runoff of each sub-catchment is allocated to the corresponding pipeline manholes to construct an SWMM model. The method for constructing the SWMM model is as follows: create a shapefile, convert it to an inp file format and import it into SWMM. The shapefile includes sub-catchment files, pipeline files, manhole nodes, and outlet files. The sub-catchment files include the following attributes: sub-catchment name, rain gauge number, outlet, area, slope, width, percentage of impermeable area, N-impermeable area, N-permeable area, impermeable area storage depth, permeable area storage depth, infiltration mode, and Horton soil infiltration parameters. Based on the SWMM model and the characteristics of the impermeable surface distribution in the study area, the area proportion of different sponge facilities construction is set, and different sponge facility construction schemes are determined. To determine the resilience of urban drainage networks under different sponge city infrastructure construction schemes, specifically including: determining the total flood volume before the construction of a sponge city under extreme rainfall conditions. The runoff controlled by sponge city facilities ; This indicates the total overflow volume of the drainage network that causes disasters after the construction of a sponge city; Determine the overflow duration of nodes without sponge city construction under extreme rainfall conditions. Overflow duration at nodes after sponge city construction ; The time difference represents the average duration of overflow at drainage network nodes after the construction of a sponge city; The resilience of urban drainage networks under different sponge city construction schemes can be calculated using the following formula: in, This indicates the runoff volume controlled by the sponge city infrastructure. This indicates the overflow duration at each node after the construction of a sponge city. This indicates the time difference of the average duration of overflow at drainage network nodes after the construction of a sponge city; before the construction of a sponge city, Equal to 0, equal The resilience of urban drainage networks is not affected by sponge city construction; after the construction of sponge cities, Increase The capacity also increases, and the resilience of the urban drainage network also increases accordingly.

2. The method for obtaining the resilience of urban drainage pipe network after sponge city construction according to claim 1, characterized in that: The data includes topographic data of the study area, the current distribution and area of ​​various underlying surfaces, current land use, urban drainage network, distribution of manholes and their lengths, diameters and burial depths, soil type zoning, and spatiotemporal distribution of rainfall.

3. The method for obtaining the resilience of urban drainage pipe network after sponge city construction according to claim 1, characterized in that, The ring cutter method experiment includes the following steps: Soil samples were collected using a ring cutter. Record the amount of water infiltrated into the soil sample inside the ring cutter; The experimental data were fitted with parameters according to the Horton infiltration formula to obtain the Horton infiltration parameters.

4. The method for obtaining the resilience of urban drainage pipe network after sponge city construction according to claim 3, characterized in that, The method for collecting soil samples using a ring sampler is as follows: Before sampling, prepare a clean ring cutter, level the ground at the sampling point, and firmly drive the prepared ring cutter into the soil. After the soil column emerges from the top of the ring cutter, use a shovel to dig away the surrounding soil. Next, remove the ring cutter filled with soil and use a soil cutter to remove the excess soil on both sides so that the volume of soil inside the ring cutter is equal to the volume of the ring cutter. Cover the bottom and top caps, bring it back indoors to weigh it, and collect one sample each from 0~20 cm and 20~40 cm. Collect at least two samples from each sampling point.

5. The method for obtaining the resilience of urban drainage pipe network after sponge city construction according to claim 3, characterized in that, The Horton infiltration formula is: In the formula, Indicates the infiltration rate; Indicates the steady infiltration rate; Indicates the initial infiltration rate; Indicates the total infiltration time; This represents a constant determined based on soil properties.

6. The method for obtaining the resilience of urban drainage pipe network after sponge city construction according to claim 1, characterized in that: The pipe file includes the following attributes: pipe name, inlet, outlet, shape, maximum depth, length, and Manning coefficient. The attributes included in the inspection well node and outlet files are: node name, node elevation, maximum burial depth; outlet name, elevation, and outflow method.

7. The method for obtaining the resilience of urban drainage pipe network after sponge city construction according to claim 1, characterized in that: In setting the area proportion for different sponge facilities, based on the characteristics of the distribution of impermeable surfaces in the study area, according to the runoff path, the impermeable surface directly connected to the outlet is defined as the directly impermeable surface, and the impermeable area directly connected to the permeable surface is defined as the indirectly connected impermeable surface. When the directly connected impermeable area exceeds a certain percentage of the area of ​​the sub-catchment area, the sub-catchment area is selected to set up sponge facilities, with the principle of laying permeable paving only on impermeable pavement, and rain gardens and sunken green spaces being laid in green spaces.

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