KR102050487B1 - A simulation method of the sanitary sewer management system - Google Patents

Abstract

Provided is a simulation method of classified sewage pipe maintenance system, which comprises the steps of: collecting and analyzing measurement data; displaying simulation target (RDII) parameters and flow graphs using a toolbox; performing model building and verification/ calibration for each sub-region; and performing model verification and a simulation evaluation. According to an embodiment of the present invention, a network system can be possible for the classified sewage pipe maintenance. In other words, the maintenance efficiency will be improved by subdividing the classified sewage pipeline into a network system for systematic maintenance and establishing a computerized system to manage problems, operation history, and basic information for each sub-region. The problem of lack of water flow due to influent water in the sewage pipe during rainfall can be identified.

Description

A simulation method of the sanitary sewer management system

The present invention relates to a system and method for the maintenance of the sewage sewer pipe system, in order to effectively maintain the sewage sewer pipe system of the sewerage system. To monitor the flow rate and analyze intrusion / inflow water, and to judge the problems of the pipeline function based on this, and manage the facility information, survey, renovation, and complaint history of the sewage pipe in terms of operation, and problems and repair priorities for each subregion. It also relates to a simulation method of a classification sewage pipe maintenance system that can obtain information on the stability of the pipeline by evaluating rainwater inflow during rainwater through the stormwater inflow simulation.

Conventionally, by dividing the target area into the concept of treatment zone and treatment basin according to the direction of sewage flow, the area and size of each zone were different and separated from the administrative zone, so there was a limit to effective maintenance.

In addition, in the prior art, there is a case of applying a system for monitoring and analyzing the flow rate of the end of each zone, but there is a lack in determining the pipe failure by installing and operating one or two measuring devices even though there is a large difference in the size of each zone.

In addition, the history management for the maintenance of information such as sewage pipes, sewage pipe dredging information, CCTV information, renovation information, and civil complaints processing information is not systematically performed.

In addition, there is a limitation in predicting rainwater inflow during rainfall or simulation for ensuring stability, and thus, predicting problems and performing preemptive maintenance.

Therefore, it is necessary to establish a method and system for dividing the sewage pipeline into small-zone concept and effectively maintaining it.

In addition, rainwater inflow from the sewage sewer pipe is called inflow water, and if the inflow water is excessive, the capacity of the sewage pipe will be insufficient, resulting in full discharge and surge, and in severe cases, the upper part of the manhole. The overflow of sewage will occur. This phenomenon is called SSOs (Sanitary Sewer Overflows), which is one of the serious problems of the sorting sewer line.

In order to simulate and review the water shortage and overflow phenomenon of the sewage pipe in advance, a simulation of the categorized sewage pipe is required.

The technical problem to be achieved by the present invention is to improve the conventional inconvenience, the classification formula for sub-segmentation of existing treatment zones and treatment basins to a certain scale for easy maintenance based on criteria such as area, sewage amount, topographic conditions, etc. It is to provide a sewage pipe maintenance system and method.

The technical problem to be achieved by the present invention is to improve the conventional inconvenient point, in order to effectively maintain the sewage sewage pipeline of the sewer, divided into a small area through the division of the target area to facilitate maintenance, measuring instrument at the end of the small area By installing the equipment, flow monitoring and analysis of intrusion / inflow water are made. Based on this, the problem of pipeline function is judged, and from the operational side, it manages facility information, investigation, renovation, complaint history, etc. It provides a method of simulating the classification sewage pipeline maintenance system that can obtain information on the priority and obtain stability information by evaluating the water supply capacity of the pipeline due to the rainfall inflow during rainfall. will be.

Simulation method of the classification sewage pipe maintenance system according to the characteristics of the present invention for solving this problem,

Collecting and analyzing metrology data;

Displaying simulation target (RDII) parameters and flow graphs using a toolbox;

Model building and calibration calibration for each subregion;

Includes model validation and simulation evaluation steps.

The model building step for each subregion,

Constructing a target network for model construction and collecting attribute data;

Calculating an input value of the pipeline model;

Calculating a DWF (Dry Weather Flow) model input value;

Calculating a simulation target (RDII) model input value.

The calibration step for each of the small areas,

DWF (Dry Weather Flow) model calibration step;

The WWF (Wet Weather Flow) model calibration step is included for the selected rainfall event.

The method,

Before the simulation,

Querying, by the server, information about an existing zone in a database for subdivision;

Selecting, by the server, a target for dividing an unsuitable treatment segment into a small region based on a small region standard;

When the division target zone is selected, the server setting a small zone boundary using a boundary or administrative area boundary such as a back road, a river, and a railroad, while satisfying an area criterion;

Determining, by the server, the suitability compared to a small area standard by extracting the stored small area information;

If it is determined that the server is suitable for the small area criterion, determining whether a boundary condition is met;

If the server determines that the boundary condition is met, the server stores the stored small region information as the divided new small region information.

Before the server queries the information about the existing zone in the database for subdivision,

Installing system equipment by performing hardware, software, network, and related auxiliary work (S201);

Performing the linkage with the GIS system of the corresponding region by using the constructed system and storing the sewage pipe information and other facilities and the area information through the linkage in the database (S202);

Storing sewage pipe information in the database (S203);

And storing other facility and area information in the database (S204).

In addition to the data secured through the GIS connection further comprises the step of receiving necessary data from the administrator terminal or input unit (S206),

Information input by the manager includes additional information and determination criteria information of the subregions, and the additional information includes the sewage generation unit and population density, and the determination criteria information of the subregions includes the area, the amount of drainage facilities, and the amount of sewage generation. Include.

In the above method,

If the subregion criterion is not suitable, the server may increase or decrease the preset subregion to generate a new subregion.

If the server determines that the boundary condition is met, the server is characterized in that the new sub-zone is created by increasing or decreasing the sub-zone stored.

In the above method,

The server further includes selecting a flowmeter installation point for flow monitoring and analysis of intrusion and influent water in each subdivision divided into subregions.

In the above step, the point for installing the flow meter is to select the end point of each small area, characterized in that the selection in consideration of the structural and functional aspects when selecting the point.

In the step of selecting by the server as an object to divide the processing partition that is inappropriate for the small area criteria,

The area for each subdivision should be in the range of 20-30 ha, the drainage for each subdivision should be in the range of 500-1,500, and the sewage generation should be in the range of 300-1,000 m3 / day.

In the embodiment of the present invention, it is possible to provide a classification sewage pipe maintenance system and method for subdividing existing treatment zones and treatment compartments into a certain scale for easy maintenance on the basis of criteria such as area, sewage volume, and geographic conditions. have.

In addition, it is expected that through the embodiment of the present invention it is possible to prepare a system for the maintenance of the sorted sewage pipe. In other words, the structure of pipe network is organized to enable systematic maintenance by subdividing the sewage sewage pipe and the computerized system is established to manage the problems, operation history, and basic information for each subregion. It is possible to check in advance the problem of lack of water flow due to inflow water from the sewage pipe.

Therefore, it is expected to improve the efficiency and convenience of overall sewage pipe maintenance by deriving the maintenance order to maximize the maintenance cost so as to prioritize the small areas with many problems and high priority for small area maintenance. .

1 is a block diagram of a subregionalization and simulation system of the classification sewage pipe maintenance system according to an embodiment of the present invention.
2 is a flow chart showing the subdivision of the classification sewage pipe maintenance system according to the embodiment of the present invention.
3A and 3B are views showing before and after subregionalization in the classification sewage pipe maintenance system according to an embodiment of the present invention.
Figure 4 is a view showing an example of selecting the flow meter installation point in the classification sewage pipe maintenance system according to an embodiment of the present invention.
5 is a view showing an example of a program example screen in the classification sewage pipe maintenance system according to an embodiment of the present invention.
6 is a block diagram of a simulation method of the classification sewage pipe maintenance system according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

1 is a block diagram of a subregionalization and simulation system of the classification sewage pipe maintenance system according to an embodiment of the present invention.

Referring to Figure 1, the classification sewage pipe maintenance system according to a feature of the present invention,

As a small zoning system that communicates with the GIS system 300 and the administrator terminal 200 through the network 400,

A database 120 for storing sewage pipe information, facility and local information;

It includes a server 110 for subdividing or simulating the sewage pipe by using the information of the database 120.

Operation of the classification sewage pipe maintenance system according to an embodiment of the present invention having such a configuration is as follows.

2 is a flow chart showing the subdivision of the classification sewage pipe maintenance system according to the embodiment of the present invention.

3A and 3B are views showing before and after subregionalization in the classification sewage pipe maintenance system according to an embodiment of the present invention.

Figure 4 is a view showing an example of selecting the flow meter installation point in the classification sewage pipe maintenance system according to an embodiment of the present invention.

5 is a view showing an example of a program example screen in the classification sewage pipe maintenance system according to an embodiment of the present invention.

Referring to FIG. 2, first, hardware, software, a network, and related auxiliary construction are installed to build a system (S201).

Then, using the built system to perform the linkage with the GIS system 300 of the region and through the linkage to the sewage pipe information and other facilities and area information is stored in the database 120 (S202).

Next, the sewage pipe information is stored in the database 120, but the sewage pipe information includes sewage pipe network and topographic map, and pipe attribute information such as pipe number, pipe length, pipe diameter, pipe slope, pipe height, ground elevation, etc. (S203).

In addition, other facilities and area information is stored in the database 120, but the other facilities and area information, such as GIS layer information, such as rivers, railroads, roads in the region, administrative boundaries, pumping station location, treatment zones and treatment district boundaries Etc. are included (S204).

Since the GIS information changes periodically, it checks whether the GIS information is changed, updates the changed information, and maintains the latest information (S205).

After that, the manager inputs necessary data in addition to the data secured through the GIS linkage (S206).

At this time, the information input by the manager includes the sewage generation unit, population density, etc. as additional information (S207).

The input unit 130 may be input or the manager terminal 200 may be input, and information display may also be performed on the display unit 140 or the screen of the manager terminal 200. The manager terminal 200 may use a variety of means such as a smartphone, PC.

In addition, the area of the small area, the amount of drainage equipment, the amount of sewage generation, etc., are input as determination criteria information of the small area (S208).

It is determined whether the additional information or the subregion determination criterion information needs to be changed (S209). That is, additional information, for example, the population density may be updated periodically because there may be a change according to the increase and decrease of the population. In addition, the sewage generation unit of the additional information may be changed when the reference values presented in the basic plan for sewerage maintenance may be changed, and then updated and inputted.

In addition, even when the subregion determination criteria information is changed, it is inputted.

Subsequently, the server 110 inquires information about the existing area in the database 120 for subdivision of the subregion after completion of the basic information linkage and additional information input (S210), and the information to be searched includes area, pipeline extension, and drainage equipment. Inquiry about quantity, population, and sewage generation through automatic calculation.

Treatment sections that are inadequate compared to the subregion criteria are selected as the target to be divided into subregions (S211).

For example, the following criteria may be applied to subdivision of subdivisions into the sewage pipelines.

The area of each subarea should be in the range of 20 ~ 30ha, but in case of settlement area where population density is lower than the standard value, sewage generation in addition to the area should be considered together. That is, the amount of sewage is to be in the range of about 300 ~ 1,000m3 / day.

In addition, the drainage system for each subdivision shall be in the range of 500 to 1,500 places, and the amount of sewage generation shall be in the range of 300 to 1,000 m3 / day.

In addition, when subdividing the subdivisions, separate the roads, rivers and railroads into the boundaries, refer to the boundaries of administrative districts, and take into consideration the flow direction, topography, and slope of the sewage as needed to allow the sewage to flow. It needs to flow from high to low.

In addition, since the sewage generation characteristics and regional characteristics are different for each region, when it is necessary to consider regional characteristics, it is necessary to classify the subregions. For example, special consideration should be given to tourism areas, rural areas, and pumped area distribution areas.

When the division target zone is selected, the server 110 sets the boundary of the small area using the boundary of the back road, the river, the railroad, or the like, while satisfying the area standard (S212). In particular, when the small zone is divided, the server 110 draws and stores the zone boundary to be divided on the program. If necessary, the administrator can draw and save the zone boundary that the administrator wants to divide.

Then, the server 110 extracts the stored small area information (S213) and determines the suitability compared to the small area standard (S214). That is, in addition to the area, it is determined whether the amount of drainage and sewage generation is within the standard range.

If necessary, population and pipeline extension criteria can be further determined. The standard range of population and pipeline extension is 1,500 ~ 5,000 for population and 5 ~ 10km for pipeline extension.

Here, when extracting information, population and sewage amount are calculated by using data inputted through automatic calculation and GIS information, and the area, pipeline extension, and amount of drainage system are aggregated through related GIS information.

In addition, when determining the appropriateness of the small area, after determining whether it meets the previously inputted small area criteria through the server 110 operation,

Administrators can check the GIS and the layers entered for review on the program screen to determine whether they meet the boundary conditions such as rivers, roads, railways, administrative boundaries, and pump stations.

If the server 110 determines that the set small area is suitable for the small area standard, it is determined whether the boundary condition is met (S215). In particular, it is determined whether the boundary is the boundary of the back road, the river and the railroad, or the boundary of the administrative district.

Finally, when the server 110 determines that the boundary condition is met or when the administrator selects that the boundary condition is also met, the server 110 stores the set and stored subregion information as divided new subregion information (S216).

On the other hand, when determining the adequacy of the small area is determined by the server 110 operation whether it meets the previously entered small area criteria, or when the boundary condition is inappropriate,

The server 110 changes the boundary of the new subregion by increasing or decreasing the subregion that is set and stored (S212).

That is, if it falls short of the reference range, the boundary is changed to increase the small area, and if it exceeds the reference range, the boundary is changed to reduce the small area and the above steps are repeated.

3A and 3B are shown as an example comparing the before and after performing the subdivision as described above.

As shown in FIG. 3A, the subdivision is divided into subdivisions according to the flow direction of sewage irrespective of the boundary of the administrative subdivision, and the subdivisions have different areas and sizes. However, as shown in FIG. 3b, when the existing pumping station is deleted and some pipelines are laid out to be subdivided, the area is equal to the boundaries of administrative divisions. Thus divided sub-divisional pipe network can solve the above problems and has an advantageous aspect in maintenance.

Then, the server 110 selects a flowmeter installation point for flow monitoring and analysis of intrusion and influent water for each subdivision divided into subdivisions (S217).

At this time, the point for installing the flowmeter should be selected at the end of each small area, and when selecting the point, select the structural side and functional side as follows.

First, the following conditions must be satisfied from the structural point of view.

Avoid conduit and bends in the pipeline so as not to affect the sewage flow.

It should be a point where worker entry and safety can be secured for installation and maintenance.

The sewer pipe manhole is to be installed at the point where the flowmeter sensor can be installed. At this time, the flowmeter sensor is installed in the upstream pipe in the manhole. An invert must be installed in the manhole.

In addition, the following conditions must be satisfied from a functional point of view.

For the monitoring and analysis of each subregion, the end pipeline of each subregion should be selected as a point and the total flow rate of the subregion should be measured.

The flowmeter equipment to measure the flow rate in the sewage pipe stably should be applied, and the small-diameter pipe line is applied to the contact equipment (ultrasound type), and the medium-diameter pipe line to the non-contact equipment (laser and radar).

The point should be of adequate grade and flow rate, with a minimum level of at least 3 cm and a minimum flow rate of at least 0.3 m / sec for stable measurement.

In consideration of the above point selection requirements, when a flow meter for each small area is installed, a flow meter is installed in the form as shown in FIG. 4, and the drawing of this type is also used for monitoring and analysis for each small area.

If necessary, the process of selecting a flowmeter installation point may be performed by the administrator after the server 110 performs a final selection, or may be selected by the administrator instead of the server 110.

Referring to FIG. 5, an example of a system program example screen is illustrated in a method of subdividing a sewage sewer pipe according to an embodiment of the present invention.

Referring to FIG. 5, a subregional region may be represented on an actual map.

Rainwater inflow from the sewage sewer pipe is called inflow water, and if the inflow water is excessive, the capacity of the sewage pipe is insufficient, resulting in the discharge of water pipes and surges. Overflow will occur. This phenomenon is called SSOs (Sanitary Sewer Overflows), which is one of the serious problems of the sorting sewer line. In order to simulate and review the water shortage and overflow of the sewage pipe in advance, a simulation of the categorized sewage pipe is required. The object to be simulated is called Rainfall Derived Infiltration and Inflow (RDII).

In the embodiment of the present invention, a simulation function is installed in the maintenance system so that the RDII can be simulated and reviewed in advance. Hereinafter, a method of performing the RDII simulation in the system will be described.

6 is a block diagram of a simulation method of the classification sewage pipe maintenance system according to an embodiment of the present invention.

Referring to FIG. 6, first, the server collects and analyzes measurement data (S600). At this time, the server performs data / information review and data error analysis for each classified subregion to determine the data necessary to meet the water permeability evaluation goal, and collects pipeline data for each subregion by performing on-site survey and survey as necessary. The server also collects rainfall and flow monitoring data.

Next, the server expresses the simulation target (RDII) parameter and the flow graph using the tool box (S610). At this time, SSOAP (Sanitary Sewer Overflow Analysis and Planning) is an analysis tool developed and published for SSOs analysis in the US EPA and can be used in conjunction with simulation. The server performs rainfall and flow monitoring data analysis through the toolbox to create RDII parameters and flow graphs and displays the results in parameters and flow graphs. The parameters applied here include R value, T value, and K value, where R value is the ratio of rainfall inflow into the pipeline compared to the rainfall estimated from the rainfall event, and T value is the peak occurrence time when RDII occurs during rainfall. The value of K denotes the ratio of the time required until the RDII disappears from the peak occurrence time.

The next server performs the model building step for each subregion (S620), and there are procedures of constructing the target network configuration and attribute data collection, estimating pipeline model input, estimating DWF model input, estimating RDII model input, and then , Calibration step (S630), which includes DWF model calibration and WWF model calibration.

Then, the server performs model verification (S640). Model verification is a step of verifying how the simulated flow rate matches the flow rate of the base after inputting the simulated rainfall event into the calibrated model, which is used to confirm the reliability of the constructed model.

The server performs a simulation evaluation with reference to the rainfall statistics analysis result (S650). In case of rainfall statistics analysis, the historical rainfall data from the meteorological station station located near the target area is acquired and analyzed, and the rainfall probability of 90% based on the cumulative probability of 3mm or more is calculated based on the daily rainfall of more than 20 years. Select the target rainfall and apply it.

At this time, the server applies the corrected model to various DWF and WWF evaluation conditions. In the case of DWF, modeling is performed in Cheongcheon after inputting DWF average data and flow pattern data for each time slot into each model. In addition, rainfall data is inputted to the WWF-calibrated model and rainfall modeling is performed, and the evaluation is performed based on water permeability problems and model simulation results.

Then, the server determines whether problems such as lack of water supply capacity of the target area, whether or not the SSOs occur (S660).

If there is a problem, the server makes an alternative or notifies the administrator terminal of the solution review, and repeats the simulation evaluation by applying the established alternative and solution (S650).

If there is no problem, the server performs continuous monitoring (S680).

Referring to the model building step (S620) for each of the small zones in detail as follows.

The server configures the network by using the pipe network and the topographic map required for model construction, and collects data such as pipe diameter, pipe length, pipe height, etc. as the pipe network attribute data (S621).

Then, the server creates pipe network information and watershed information of the pipeline model and calculates the input value of the model (S622).

Next, the server calculates an average flow rate and time-phase occurrence pattern as a DWF (Dry Weather Flow) model input value (S623).

Next, the server calculates and inputs a simulation target (RDII) model input value (S624), and the RDII parameter S610 calculated above is applied thereto.

In this process, a model is constructed for each of the subregions.

Referring to the calibration correction step (S630) for each of the small areas as follows.

The server corrects the model by applying the measured Cheoncheon flow, time-specific occurrence pattern and intrusion quantity to the DWF (Dry Weather Flow) model (S631).

The server simulates by applying the RTK value calculated by SSOAP based on the result of correction through Cheongcheon-si simulation, and the WWF (Wet Weather Flow) for the rainfall event selected so that the error rate between the measured value and the simulated value does not exceed 10%. , Rainfall flow rate) correct the model (S632).

In this detailed process, calibration is performed for each of the subregions.

There are many ways to perform the simulation, such as the accuracy of the basic data and the suitability of model construction.

In particular, in the embodiment of the present invention is applied to use the measurement data of the maintenance system together, it is possible to periodically perform the simulation by utilizing the measurement data of the system. Therefore, it is utilized in the model construction and calibration calibration stage. The model construction and calibration process includes calculating model input data and calculating the RDII parameters using the SSOAP toolbox, and then performing model calibration. It is completed to increase and utilizes this to derive prediction results for various rainfall events.

In the embodiment of the present invention, it is possible to provide a classification sewage pipe maintenance system and method for subdividing existing treatment zones and treatment compartments into a certain scale for easy maintenance on the basis of criteria such as area, sewage volume, and geographic conditions. have.

In addition, it is expected that through the embodiment of the present invention it is possible to prepare a system for the maintenance of the sorted sewage pipe. In other words, the structure of pipe network is organized to enable systematic maintenance by subdividing the sewage sewage pipe and the computerized system is established to manage the problems, operation history, and basic information for each subregion. It is possible to check in advance the problem of lack of water flow due to inflow water from the sewage pipe.

Therefore, it is expected to improve the efficiency and convenience of overall sewage pipe maintenance by deriving the maintenance order to maximize the maintenance cost so as to prioritize the small areas with many problems and high priority for small area maintenance. .

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (10)

Collecting and analyzing metrology data;
Displaying simulation target (RDII) parameters and flow graphs using a toolbox;
Model building and calibration calibration for each subregion;
Including model validation and simulation evaluation
The model building step for each subregion,
Constructing a target network for model construction and collecting attribute data;
Calculating an input value of the pipeline model;
Calculating a DWF (Dry Weather Flow) model input value;
Calculating a simulation target (RDII) model input value,
The calibration step for each of the small areas,
DWF (Dry Weather Flow) model calibration step;
Including a wet weather flow (WWF) model calibration step for the selected rainfall event,
Before the simulation,
Querying, by the server, information about an existing zone in a database for subdivision;
Selecting, by the server, a target for dividing an unsuitable treatment segment into a small region based on a small region standard;
When the division target zone is selected, the server setting a small zone boundary by using a boundary or administrative zone boundary such as a back road, a river, and a railroad, while satisfying an area criterion;
Determining, by the server, the suitability compared to the small area standard by extracting the stored small area information;
If it is determined that the server is suitable for the small area criterion, determining whether a boundary condition is met;
And if the server determines that the boundary condition is met, storing the stored stored subregion information as divided new subregion information. delete delete delete The method of claim 1,
Before the server queries the information about the existing zone in the database for subdivision,
Installing system equipment by performing hardware, software, network, and related auxiliary work (S201);
Performing the linkage with the GIS system of the corresponding region by using the constructed system and linking the sewage pipe information and other facilities with the area information through the linkage and storing it in the database (S202);
Storing sewage pipe information in the database (S203);
And storing (S204) other facility and area information in the database. The method of claim 5,
In addition to the data secured through the GIS connection further comprises the step of receiving necessary data from the administrator terminal or input unit (S206),
Information input by the manager includes additional information and determination criteria information of the subregions, and the additional information includes the sewage generation unit and population density, and the determination criteria information of the subregions includes the area, the amount of drainage facilities, and the amount of sewage generation. Simulation method of the classification sewage pipe maintenance system including. The method of claim 6,
If the small area criterion is not suitable, the server increases or decreases the set-segmented small area to generate a new small area. The method of claim 7, wherein
And when the server determines that the boundary condition is met, the server generates a new subregion by increasing or decreasing the stored subregion and creating a new subregion. The method of claim 8,
The server further comprises the step of selecting the flowmeter installation point for flow monitoring and analysis of intrusion and influent water in each subdivision divided into subdivisions. The method of claim 9,
In the above step, the point for installing the flow meter is to select the end point of each small area, and when selecting a point in consideration of the structural and functional aspects, the method of simulation of the sewage pipe maintenance system.

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