A road emergency toxic pond switching control method based on rain discrimination and water level monitoring

Abstract

The application discloses a road emergency toxic pond switching control method based on rainwater discrimination and water level monitoring, which comprises the following steps: 1, system initialization; 2, judging whether a water flow signal is detected, if yes, executing step 3, if no, executing step 8; 3, judging whether the water flow is clean water, if yes, executing step 4, if no, executing step 7; 4, judging whether the water quality fluctuates, if yes, executing step 5, if no, executing step 6; 5, non-polluted rainwater and executing corresponding countermeasures; 6, polluted rainwater and executing corresponding countermeasures; 7, sewage invasion discrimination pipe and executing corresponding countermeasures; 8, judging whether the water quality fluctuates, if yes, executing step 9, if no, executing step 10; 9, non-rainday sewage invasion and executing corresponding countermeasures; 10, non-rainday clean water runoff and executing corresponding countermeasures. The application relates to the technical field of road environmental protection emergency facilities and can solve the technical defects in the prior art.

Description

Technical Field

[0001] This invention relates to the field of road environmental emergency facilities technology, and in particular to a method for switching control of road emergency toxic storage tanks based on rainwater identification and water level monitoring. Background Technology

[0002] Roadside emergency chemical storage ponds are core facilities for ensuring the safety of water environments in sensitive areas. Their core function is to quickly intercept and store polluted water bodies in the event of accidents such as leaks from hazardous chemical transport vehicles, sewage intrusion, or initial rainwater pollution, preventing pollutants from spreading to surrounding water bodies and causing ecological damage. At the same time, the facility must also take into account the regular drainage needs of normal rainfall and surface runoff to avoid road flooding affecting traffic safety, thus achieving a dual function of "emergency prevention and control + daily drainage".

[0003] The existing emergency toxic gas storage tanks on roads generally have significant technical flaws in their operational switching methods, making it difficult to meet the high standards of water environment risk prevention and control in sensitive areas: First, some systems rely solely on a single sensor (such as a rainwater sensor or a liquid level sensor) for operational condition determination, failing to consider complex scenarios such as water quality fluctuations, local sewage interference, and hazardous waste spillage. This limited judgment dimension makes them prone to misjudgment. Second, most systems lack AI / video verification and linkage mechanisms, making it impossible to accurately identify and differentiate pollution scenarios. This results in the initial treatment of rainwater and hazardous waste-contaminated water bodies being treated in the same way, leading to wasted treatment costs or loopholes in pollution prevention and control. Third, the operational condition switching logic is simplistic, failing to detail emergency response procedures for scenarios such as sudden changes in pollution or sewage intrusion. This leads to delayed responses, often failing to intercept pollutants in the early stages of pollution, or causing gate malfunctions in conventional drainage scenarios. Fourth, existing systems do not clearly distinguish the subsequent treatment paths for different pollution scenarios, increasing the risk of illegal discharge of hazardous waste-contaminated water bodies into sewage networks.

[0004] For example, Chinese invention patent CN201010178822.0 discloses an automatic rainwater venting device for a toxic storage tank. This device can only distinguish between rain and no rain through a rainwater signal bottle, but cannot determine water quality properties or pollution scenarios. Chinese utility model patent CN200820150883.4 discloses a toxic sedimentation tank. This sedimentation tank relies on manual or remote control to switch operating conditions, and does not achieve automatic identification of multiple operating conditions. Furthermore, it lacks water quality monitoring and AI / video verification, resulting in loopholes in pollution prevention and control. Chinese utility model patent CN202320123456.7 discloses a water quality monitoring device for road emergency toxic storage tanks. Although this device adds water quality monitoring functions, it does not refine the handling logic for different pollution scenarios, nor does it set up a verification and linkage mechanism, thus failing to meet differentiated prevention and control needs.

[0005] Therefore, there is a need to provide a switching control method for road emergency gas storage tanks based on rainwater identification and water level monitoring, which can solve the above-mentioned technical defects in the existing technology. Summary of the Invention

[0006] The purpose of this invention is to provide a switching control method for road emergency toxic storage tanks based on rainwater identification and water level monitoring, which can solve the above-mentioned technical defects in the prior art.

[0007] This invention is implemented as follows:

[0008] A method for switching control of road emergency toxic substance storage tanks based on rainwater identification and water level monitoring includes the following steps:

[0009] Step 1: Provide a road emergency toxic substance storage tank switching control system based on rainwater identification and water level monitoring, and initialize the system for standby;

[0010] Step 2: The system uses an independent discrimination unit to determine whether a water flow signal is detected. If yes, proceed to step 3; otherwise, proceed to step 8.

[0011] Step 3: The system uses an independent discrimination unit to determine whether the water flow is clean water. If it is, proceed to step 4; otherwise, proceed to step 7.

[0012] Step 4: The system uses the water flow area monitoring unit to determine if there are fluctuations in water quality. If yes, proceed to step 5; otherwise, proceed to step 6.

[0013] Step 5: The system determines that the rainwater is unpolluted and implements corresponding countermeasures;

[0014] Step 6: The system determines that the pollution is due to rain and executes corresponding countermeasures;

[0015] Step 7: The system identifies the sewage intrusion detection pipe and executes corresponding countermeasures;

[0016] Step 8: The system uses the water flow area monitoring unit to determine if there are fluctuations in water quality. If yes, proceed to step 9; otherwise, proceed to step 10.

[0017] Step 9: The system determines that the intrusion is due to sewage on a non-rainy day and executes corresponding countermeasures;

[0018] Step 10: The system determines that the runoff is clean water from a non-rainy day and implements corresponding countermeasures.

[0019] The system includes a toxic storage tank body, an independent discrimination unit, a water-passing area monitoring unit, a control module, and a verification and linkage unit. The toxic storage tank body includes a water-passing area and a toxic storage space connected by several toxic storage space gates. The inlet of the water-passing area is connected to the water inlet system through a one-way check valve, and the outlet of the water-passing area is connected to the downstream drainage system through an outlet gate. The independent discrimination unit includes an independent rainwater inlet, a discrimination pipe, a water flow sensor, and a first water quality sensor. The independent rainwater inlet is located in a non-road area. One end of the discrimination pipe is connected to the independent rainwater inlet, and the other end of the discrimination pipe is connected to the water-passing area. The water flow sensor and the first water quality sensor are both located inside the discrimination pipe and connected to the control module. The verification and linkage unit is located on both sides of the road and around the water inlet of the water-passing area and is connected to the control module. The water-passing area monitoring unit includes a second water quality sensor and a level gauge connected to the control module. The second water quality sensor is located at the water inlet of the water-passing area, and the level gauge is located within the water-passing area.

[0020] The independent rainwater inlet is set at an elevation 100-300mm higher than the surrounding road surface and has a built-in filter screen; the outlet gate includes an electric main gate and a mechanical emergency auxiliary gate, forming a dual-level redundant structure; the verification and linkage unit includes a clear camera and / or an AI intelligent recognition module.

[0021] Step 5 includes the following sub-steps:

[0022] Step 51: The level gauge of the water-passing area monitoring unit monitors the liquid level in the water-passing area of ​​the toxic gas storage tank in real time, and sends an alarm signal to the control module when the liquid level in the water-passing area reaches the alarm level.

[0023] Step 52: The control module controls the outlet gate to open, and the water flow in the water passage area is discharged to the downstream drainage system through the outlet gate;

[0024] Step 53: If the water flow sensor does not detect a water flow signal and the level gauge detects that the liquid level in the water-passing area has dropped to the preset normal water level, close the outlet gate and the system returns to standby. Otherwise, keep the outlet gate open to drain water.

[0025] During the process of opening the outlet gate to drain water, the system uses the second water quality sensor of the water passage area monitoring unit to detect the water quality in the water passage area of ​​the toxic storage tank in real time and determine whether there is water quality fluctuation during the drainage process. If not, the outlet gate is kept open to drain water; if so, it is determined to be a sudden change in water quality during normal rain and corresponding countermeasures are implemented.

[0026] The response measures for sudden changes in water quality during normal rainfall are as follows: the control module controls the emergency closure of the outlet gate and opens the toxic storage space gate, allowing water from the water flow area to flow into the toxic storage space through the toxic storage space gate; at the same time, the control module triggers the verification linkage unit, and the operation and maintenance personnel use the verification linkage unit to investigate the pollution source and activate the emergency plan, and treat the pollutants according to the type of pollution. After the treatment is completed, the system returns to standby.

[0027] Step 6 includes the following sub-steps:

[0028] Step 61: The level gauge of the water-passing area monitoring unit monitors the liquid level in the water-passing area of ​​the toxic gas storage tank in real time, and sends an alarm signal to the control module when the liquid level in the water-passing area reaches the alarm level.

[0029] Step 62: The control module controls the opening of the gas storage space gate and triggers the verification linkage unit. The operation and maintenance personnel use the verification linkage unit to determine whether there are any hazardous waste vehicles overturned on the road. If yes, proceed to step 63; otherwise, proceed to step 64.

[0030] Step 63: The system determines that the pollution is caused by initial rainwater runoff and implements corresponding countermeasures;

[0031] The initial measures to deal with rainwater pollution are as follows: the control module controls the toxic storage space gate to close and the outlet gate to open; after the water flow sensor detects and determines that there is no water flow signal in the pipe, that is, after the rain stops, the sewage in the toxic storage space is diverted to the sewage pipe network, and the system returns to standby.

[0032] Step 64: The system determines that the pollution is caused by a hazardous waste vehicle overturning during the initial stage of rainfall and implements corresponding countermeasures;

[0033] The measures to deal with pollution caused by hazardous waste vehicles overturning during the initial stage of rainfall are as follows: activate the emergency response plan, use specialized vehicles to transfer and dispose of the overturned vehicles, and only after maintenance personnel confirm that the disposal has met the standards can the control module open the outlet gate and the system return to standby.

[0034] The measures to address the sewage intrusion detection pipe are as follows: the control module closes the outlet gate and notifies on-site inspection personnel to conduct an on-site inspection; simultaneously, the level gauge of the water-passing area monitoring unit monitors the liquid level in the water-passing area of ​​the toxic storage tank in real time and determines whether the liquid level in the water-passing area has reached the alarm level. If not, monitoring continues; if so, it is determined to be sewage confluence, and the control module keeps the outlet gate closed and opens the toxic storage space gate to intercept the sewage, allowing the sewage to flow into the toxic storage space through the toxic storage space gate; after the on-site inspection personnel have completed the handling and confirmed that the handling has met the standards, the control module opens the outlet gate and closes the toxic storage space gate, and the system returns to standby.

[0035] The measures to address sewage intrusion during non-rainy days are as follows: The level gauge of the water-passing area monitoring unit monitors the liquid level in the water-passing area of ​​the toxic storage tank in real time and determines whether the liquid level in the water-passing area has reached the alarm level. If not, monitoring continues. If so, the control module controls the outlet gate to close and opens the toxic storage space gate, while triggering the verification linkage unit. The operation and maintenance personnel use the verification linkage unit to investigate the pollution source and activate the emergency plan. The pollutants are treated according to the type of pollution. After the treatment is completed, the control module opens the outlet gate and closes the toxic storage space gate, and the system returns to standby.

[0036] The measures to deal with the runoff of clean water on non-rainy days are as follows: the level gauge of the water-passing area monitoring unit monitors the liquid level in the water-passing area of ​​the toxic substance storage tank in real time and determines whether the liquid level in the water-passing area has reached the alarm level. If not, the monitoring continues. If so, the control module opens the outlet gate, and the water flow in the water-passing area is discharged to the downstream drainage system through the outlet gate. When the liquid level in the water-passing area is determined to drop to the normal water level, the outlet gate is closed and the system returns to standby.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1. The present invention has a more comprehensive discrimination dimension: it adopts a four-fold logic of "water flow signal + dual-area water quality verification + liquid level monitoring + AI / video verification", covering the judgment criteria of seven typical working conditions (including complex scenarios such as hazardous waste overturning and sudden changes in the middle of the journey), which solves the defects of traditional systems in discrimination being single and incomplete, and achieves full coverage of various road water environment risk scenarios.

[0039] 2. The working condition identification of the present invention is more accurate: Through the linkage verification of two water quality sensors, combined with AI intelligent identification and manual review mechanism, it can not only accurately distinguish between clean water / sewage and polluted / unpolluted states, but also effectively identify special pollution scenarios such as hazardous waste spillage, greatly reducing the false judgment rate and avoiding the problems of accidental interception of conventional drainage and accidental discharge of polluted water bodies.

[0040] 3. The disposal of this invention is more differentiated: it formulates exclusive disposal paths for different pollution scenarios (initial rainwater, hazardous waste spillage, sewage intrusion, etc.), and achieves precise adaptation of "conventional drainage, interception to sewage pipe network, and professional transfer and disposal", which not only ensures smooth drainage, but also reduces disposal costs, and at the same time eliminates the risk of illegal discharge of hazardous waste into water bodies.

[0041] 4. The response of this invention is more timely and reliable: By setting up an emergency response mechanism for sudden changes in pollution, seamless switching between "normal drainage and emergency interception" is achieved; combined with the dual-redundancy structure of the outlet gate, the dual power supply system of the control module, and the locking function of the toxic gas storage gate, the system can still operate effectively under extreme conditions such as equipment failure, power outage, and special pollution, meeting the needs of unattended outdoor operation.

[0042] 5. The invention has greater scalability: the system has a simple structure, the component selection is adapted to the actual application of road engineering, the implementation cost is low and the maintenance is convenient. The parameter thresholds and treatment logic can be adjusted according to the water quality characteristics of different regions and the prevention and control requirements of sensitive areas. It is applicable to various road engineering projects that cross sensitive areas. Attached Figure Description

[0043] Figure 1 This is a flowchart of the road emergency toxic substance storage tank switching control method based on rainwater identification and water level monitoring according to the present invention;

[0044] (Note: The font in the image is too small and unclear. Please arrange the text more compactly and enlarge the font.)

[0045] Figure 2 This is a schematic diagram of the system used in the road emergency toxic storage tank switching control method based on rainwater identification and water level monitoring of the present invention.

[0046] In the diagram, 11 is the water passage area, 12 is the toxic storage space, 21 is the independent rainwater inlet, 22 is the discrimination tube, 23 is the water flow sensor, 24 is the first water quality sensor, 31 is the second water quality sensor, 32 is the level gauge, 41 is the electric main gate, 42 is the mechanical emergency auxiliary gate, 43 is the toxic storage space gate, 5 is the water inlet system, and 6 is the downstream drainage system. Detailed Implementation

[0047] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] Please see the appendix Figure 1 A method for switching control of road emergency toxic substance storage tanks based on rainwater identification and water level monitoring includes the following steps:

[0049] Step 1: Provide a road emergency gas storage tank switching control system based on rainwater identification and water level monitoring (hereinafter referred to as the system), and initialize the system for standby.

[0050] Please see the appendix Figure 2The system includes a toxic storage tank body, an independent discrimination unit, a water passage area monitoring unit, a control module, and a verification and linkage unit. The toxic storage tank body includes a water passage area 11 and a toxic storage space 12 connected by several toxic storage space gates 43. The inlet of the water passage area 11 is connected to the water inlet system 5 through a one-way check valve, and the outlet of the water passage area 11 is connected to the downstream drainage system 6 through an outlet gate. The independent discrimination unit includes an independent rainwater inlet 21, a discrimination pipe 22, a water flow sensor 23, and a first water quality sensor 24. The independent rainwater inlet 21 is located in a non-road area (e.g., (In the green belt, etc.), one end of the discrimination tube 22 is connected to the independent rainwater inlet 21, and the other end of the discrimination tube 22 is connected to the water passage area 11. The water flow sensor 23 and the first water quality sensor 24 are both installed in the discrimination tube 22 and connected to the control module. The verification linkage unit is installed on both sides of the road and around the water inlet of the water passage area 11 and is connected to the control module. The water passage area monitoring unit includes a second water quality sensor 31 and a level gauge 32 connected to the control module. The second water quality sensor 31 is installed at the water inlet of the water passage area 11, and the level gauge 32 is arranged in the water passage area 11.

[0051] Preferably, the toxic storage space 12 should have anti-leakage and anti-corrosion properties, with an effective pool volume ≥30m³ and an anti-permeability grade ≥P8, to meet the storage requirements of various polluted water bodies (including hazardous waste leakage liquid); the water passage area 11 is used for the smooth flow of conventional rainwater and surface runoff, and at the same time provides an installation carrier for the monitoring unit.

[0052] The independent rainwater inlet 21 is set at an elevation 100-300mm higher than the surrounding road surface and has a built-in filter screen. It is used only to collect potential rainwater, ensuring the representativeness of the incoming water and avoiding interference from road pollutants.

[0053] Preferably, the independent rainwater inlet 21 has no contact with the road that may be polluted, thus ensuring that when the water flow sensor 23 detects the water flow signal, it can determine that the water flow is clean water (including rainwater, clean water runoff, and other non-polluted water); the filter screen can be a stainless steel filter screen with a pore size ≤ 8mm, used to filter leaves, garbage, etc.; the independent rainwater inlet 21 can be made of HDPE pipe with a diameter of 100-150mm and a pipe slope ≥ 0.005 to keep the independent rainwater inlet 21 unobstructed and free of water accumulation.

[0054] Preferably, the protection level of the water flow sensor 23 and the first water quality sensor 24 is not lower than IP68 to ensure stable operation in harsh outdoor environments and achieve synchronous acquisition of water flow signals and water quality signals within the discrimination tube 22. The water flow sensor 23 and the first water quality sensor 24 are installed in series in the middle section of the discrimination tube 22. The water flow sensor 23 is used to monitor whether water flows through the discrimination tube 22 and can be selected adaptively according to actual usage requirements. The first water quality sensor 24 is used to monitor water quality fluctuations within the discrimination tube 22 (identifying pollution conditions) and can be selected adaptively according to local road rainwater / sewage identification requirements, with a response time ≤1s, such as a conductivity sensor or a multi-parameter water quality sensor.

[0055] The second water quality sensor 31 is used to monitor water quality fluctuations within the water-passing area 11 (to identify pollution conditions). It can be adaptively selected according to actual usage needs, with a response time of ≤1s. The distance between the second water quality sensor 31 and the outlet of the water inlet pipe of the water inlet system 5 is ≤50cm to ensure accurate capture of the incoming water quality.

[0056] The level gauge 32 can be an submersible or ultrasonic level gauge to monitor changes in the liquid level within the water passage area 11, with a measurement accuracy of ±2mm. It is installed at the core confluence point of the water passage area 11. The level gauge 32 can be preset with two thresholds: an alarm level (above the normal water level, 70-80cm from the bottom of the water passage area 11) and a normal water level (50cm from the bottom of the water passage area 11). The distance between these two thresholds is 200-300mm, providing a water level basis for the opening and closing of the outlet gate and the toxic gas storage space gate 43. When the liquid level in the water passage area 11 reaches the alarm level, a corresponding signal is sent to the control module; when the liquid level in the water passage area 11 drops to the normal water level, a corresponding signal is sent to the control module, meeting the water level control requirements for both routine drainage and emergency interception.

[0057] Preferably, the first water quality sensor 24 and the second water quality sensor 31 can adaptively preset the clear water range and water quality fluctuation judgment threshold based on local rainwater quality, sewage characteristic monitoring data, etc. The water quality fluctuation judgment threshold can be set based on the core criterion of "the change range of water quality parameters within 30 minutes is ≥20%".

[0058] Preferably, a one-way check valve is installed at the connection between the water inlet system 5 and the water passage area 11, and is linked with the control module to prevent pollutants in the toxic storage space 12 from flowing back into the water inlet system 5 and causing secondary pollution.

[0059] The outlet gate includes an electric main gate 41 and a mechanical emergency auxiliary gate 42, forming a dual-level redundant structure for water flow control in conventional drainage scenarios.

[0060] Preferably, the nominal pressure of the electric main gate 41 is ≥1.0MPa, the sealing material is compatible with chemicals that may come into contact with it, such as chemically resistant materials like fluororubber, and the opening and closing time is ≤30s to meet the requirements of rapid operation switching; the mechanical emergency auxiliary gate 42 can be operated by a manual crank and serves as a redundancy guarantee in case of failure of the electric main gate 41, with an opening and closing force ≤50N, which is convenient for manual emergency operation.

[0061] Preferably, the toxic waste storage space gate 43 adopts an electric opening and closing method with an opening and closing response time of ≤20s. It is linked with the control module to achieve rapid opening, which is suitable for special scenarios such as hazardous waste pollution. It is also equipped with an electromagnetic locking device, which automatically locks after opening in hazardous waste pollution scenarios. It requires manual unlocking by maintenance personnel and can only be closed after confirming that the disposal has been completed.

[0062] Preferably, the control module can adopt a PLC controller with existing technology, which has powerful logic operation and multi-signal processing capabilities. It can simultaneously receive monitoring signals from the water flow sensor, dual water quality sensors, level gauge, and verification linkage unit, and quickly output control commands such as gate opening and closing, alarm triggering, and emergency plan activation. Simultaneously, it is equipped with a dual power supply system of "solar energy + UPS," with a solar panel power ≥50W and a battery capacity ≥50Ah, ensuring continuous power supply ≥72 hours after a power outage to meet unattended operation requirements. The control module has built-in emergency plan triggering logic, which can output differentiated emergency commands according to the pollution scenario (hazardous waste spillage, ordinary sewage intrusion, etc.).

[0063] Preferably, the control module also includes a manual control interface and a status feedback unit (e.g., a verification result input interface). The manual control interface allows for manual intervention in the actions of each component under special circumstances, while the status feedback unit transmits data to the remote monitoring platform via a 4G / 5G network, facilitating real-time monitoring and data traceability by the operation and maintenance personnel of the remote monitoring platform, and realizing collaborative control of "automatic judgment + manual verification".

[0064] Preferably, the verification and linkage unit may include a high-definition camera and / or an AI intelligent recognition module. The high-definition camera can be installed on both sides of the road and around the water inlet of the water passage area 11, with a field of view covering the road driving area and the area around the inlet pipe of the toxic waste storage tank. The protection level is not lower than IP66, and it has the function of night infrared shooting. The AI ​​intelligent recognition module has a built-in hazardous waste vehicle feature database and rollover recognition algorithm. The accuracy rate of hazardous waste vehicle rollover recognition is ≥95%, the recognition response time is ≤3s, and the recognition result is transmitted to the control module and remote monitoring platform in real time. At the same time, it supports maintenance personnel to retrieve the real-time video captured by the high-definition camera through the remote monitoring platform for manual verification, providing a basis for differentiated disposal.

[0065] Maintenance personnel can use high-definition cameras and / or AI intelligent recognition modules to verify whether hazardous waste vehicles have overturned on the road, and identify pollution sources. This allows them to activate corresponding emergency plans based on the type of pollutants, carry out targeted pollutant disposal, and prevent environmental pollution. The verification results are then fed back to the control module, facilitating the control module's control of the toxic storage space gate 43 and the exit gate.

[0066] Step 2: The system uses an independent discrimination unit to determine whether a water flow signal is detected. If yes, proceed to step 3; otherwise, proceed to step 8.

[0067] When it rains, rainwater flows into the discrimination tube 22 through the independent rainwater inlet 21. The independent discrimination unit can detect the water flow signal in the discrimination tube 22 through the water flow sensor 23.

[0068] Step 3: The system uses an independent discrimination unit to determine whether the water flow is clean water. If it is, proceed to step 4; otherwise, proceed to step 7.

[0069] The first water quality sensor 24 can detect whether the water quality of the water flow in the discrimination tube 22 is within the preset clean water range. If it is, the water flow is determined to be clean water (i.e., unpolluted). If not, the water flow is determined to be sewage (i.e., polluted).

[0070] Step 4: The system uses the water flow area monitoring unit to determine if there are fluctuations in water quality. If yes, proceed to step 5; otherwise, proceed to step 6.

[0071] The second water quality sensor 31 of the water flow area monitoring unit detects the water quality in the water flow area 11 of the toxic storage tank. If the water quality change exceeds the preset range (e.g., change within 30 minutes < 20%), it is determined that the water quality in the water flow area 11 is fluctuating; otherwise, it is determined that the water quality in the water flow area 11 is not fluctuating.

[0072] Step 5: The system determines that the rainwater is unpolluted and implements corresponding countermeasures.

[0073] Step 5 includes the following sub-steps:

[0074] Step 51: The level gauge 32 of the water-passing area monitoring unit monitors the liquid level in the water-passing area 11 of the toxic gas storage tank in real time, and sends an alarm signal to the control module when the liquid level in the water-passing area 11 reaches the alarm level.

[0075] Step 52: The control module controls the outlet gate to open, and the water flow in the water passage area 11 is discharged to the downstream drainage system 6 through the outlet gate.

[0076] Step 53: When the water flow sensor 23 does not detect a water flow signal and the level gauge 32 monitors the water level in the water-passing area 11 and it drops to the preset normal water level, the outlet gate is closed and the system returns to standby. Otherwise, the outlet gate is kept open to drain water, ensuring smooth drainage of normal pollution-free rainfall and avoiding road water accumulation that could affect traffic safety.

[0077] During the process of opening the outlet gate to drain water, the system uses the second water quality sensor 31 of the water flow area monitoring unit to detect the water quality in the water flow area 11 of the toxic storage tank in real time and determine whether there is water quality fluctuation during the drainage process. If not, the outlet gate is kept open to drain water. If so, it is determined to be a sudden change in water quality during normal rain and corresponding countermeasures are implemented.

[0078] The measures to deal with sudden changes in water quality during normal rainfall are as follows: the control module controls the emergency closure of the outlet gate and opens the toxic storage space gate 43, allowing the water in the water passage area 11 to flow into the toxic storage space 12 through the toxic storage space gate 43; at the same time, the control module triggers the verification linkage unit, and the operation and maintenance personnel use the verification linkage unit to check the pollution source and activate the emergency plan to treat the pollutants according to the type of pollution. After the treatment is completed, the system returns to standby.

[0079] The measures to deal with sudden changes in water quality during normal rainfall can cope with sudden pollution during rainfall (such as hazardous waste leakage or sudden sewage intrusion), prevent the discharge of polluted water bodies due to the already opened outlet gates, and achieve a seamless switch between "normal drainage and emergency interception".

[0080] For different pollution sources, corresponding emergency plans can be formulated. Emergency plans for pollution control are routine environmental protection management measures in this field, and will not be elaborated here.

[0081] Step 6: The system determines that the pollution is caused by rain and executes corresponding countermeasures.

[0082] Step 6 includes the following sub-steps:

[0083] Step 61: The level gauge 32 of the water-passing area monitoring unit monitors the liquid level in the water-passing area 11 of the toxic gas storage tank in real time, and sends an alarm signal to the control module when the liquid level in the water-passing area 11 reaches the alarm level.

[0084] Step 62: The control module controls the opening of the gas storage space gate 43 and triggers the verification linkage unit. The operation and maintenance personnel use the verification linkage unit to determine whether there are any hazardous waste vehicles overturned on the road. If yes, then proceed to step 63; otherwise, proceed to step 64.

[0085] Similar to step 5, maintenance personnel can use high-definition cameras and / or AI intelligent recognition modules to determine whether hazardous waste vehicles have overturned on the road, which will not be elaborated here.

[0086] Step 63: The system determines that it is initial rainwater pollution and implements corresponding countermeasures.

[0087] The measures to deal with the initial rainwater pollution are as follows: the control module controls the toxic storage space gate 43 to close and the outlet gate to open; after the water flow sensor 23 detects no water flow signal in the discrimination tube 22, that is, after the rain stops, the sewage in the toxic storage space 12 is intercepted to the sewage pipe network, and the system returns to standby.

[0088] Initial rainwater pollution control measures can intercept initial polluted rainwater, preventing direct discharge of polluted water bodies, and can also be distinguished from hazardous waste pollution scenarios to reduce disposal costs.

[0089] Step 64: The system determines that the pollution is caused by a hazardous waste vehicle overturning during the initial stage of rainfall and implements corresponding countermeasures.

[0090] The measures to deal with pollution caused by the overturning of hazardous waste vehicles in the early stage of rainfall are as follows: activate the emergency response plan, transfer and dispose of the overturned vehicle by a professional vehicle, and only after the maintenance personnel confirm that the disposal meets the standards (i.e., the water quality in the flooded area 11 meets the local emission standards) can the control module open the outlet gate and the system return to standby.

[0091] The measures taken to deal with the pollution caused by the overturning of hazardous waste vehicles in the early stages of rainfall can quickly intercept the leakage of hazardous waste into water bodies and the subsequent runoff, prevent the spread of hazardous waste pollutants to sensitive water bodies, and minimize the risk of ecological pollution.

[0092] Step 7: The system determines that the sewage intrusion detection pipe 22 is a local sewage interference scenario and executes the corresponding countermeasures.

[0093] The measures to address the sewage intrusion detection pipe 22 are as follows: the control module controls the outlet gate to close and notifies on-site inspection personnel to conduct on-site inspections (e.g., whether there is any random discharge of sewage in the surrounding area); at the same time, the level gauge 32 of the water flow area monitoring unit monitors the liquid level in the water flow area 11 of the toxic storage tank body in real time and determines whether the liquid level in the water flow area 11 has reached the alarm level. If not, it continues to monitor; if so, it is determined to be sewage confluence. The control module keeps the outlet gate closed and opens the toxic storage space gate 43 to intercept sewage, allowing sewage to flow into the toxic storage space 12 through the toxic storage space gate 43; after the on-site inspection personnel have completed the treatment and confirmed that the treatment meets the standards (i.e., the water quality in the water flow area 11 meets the local discharge standards), the control module opens the outlet gate and closes the toxic storage space gate 43, and the system returns to standby.

[0094] The measures taken by the sewage intrusion detection pipe 22 can intercept local sewage interference, prevent sewage from being mistakenly discharged into sensitive water bodies downstream, and at the same time promptly investigate the source of sewage discharge.

[0095] Step 8: The system uses the water flow area monitoring unit to determine if there are fluctuations in water quality. If yes, proceed to step 9; otherwise, proceed to step 10.

[0096] The method for judging water quality fluctuations in step 8 is the same as that in step 4, and will not be repeated here.

[0097] Step 9: The system determines that the intrusion is due to sewage on a non-rainy day and executes corresponding countermeasures.

[0098] The measures to deal with sewage intrusion on non-rainy days are as follows: The level gauge 32 of the water-passing area monitoring unit monitors the liquid level in the water-passing area 11 of the toxic storage tank in real time and determines whether the liquid level in the water-passing area 11 has reached the alarm level. If not, it continues to monitor. If so, the control module controls the outlet gate to close and opens the toxic storage space gate 43. At the same time, it triggers the verification linkage unit. The operation and maintenance personnel use the verification linkage unit to check the pollution source (such as the overturning of a hazardous chemical vehicle, the rupture of a sewage pipe, etc.) and activate the emergency plan. The pollutants are treated according to the type of pollution. After the treatment is completed, the control module opens the outlet gate and closes the toxic storage space gate 43, and the system returns to standby.

[0099] The method for identifying pollution sources in step 9 is the same as in step 5, and will not be repeated here. Depending on the type of pollution source, professional transfer or compliant disposal methods should be used; contaminated wastewater must not be discharged arbitrarily.

[0100] Step 10: The system determines that the runoff is non-rainy day clear water runoff (e.g., surface runoff from road erosion) and executes corresponding countermeasures.

[0101] The measures to deal with the runoff of clean water on non-rainy days are as follows: The level gauge 32 of the water flow monitoring unit monitors the level of the water in the water flow area 11 of the toxic storage tank in real time and determines whether the level of the water in the water flow area 11 has reached the alarm level. If not, it continues to monitor. If so, the control module opens the outlet gate, and the water in the water flow area 11 is discharged to the downstream drainage system 6 through the outlet gate. When it is determined that the level of the water in the water flow area 11 has dropped to the normal water level, the outlet gate is closed and the system returns to standby.

[0102] Measures to address runoff during non-rainy days can ensure the smooth discharge of surface runoff from roads and prevent localized water accumulation from affecting traffic.

[0103] This invention employs a four-fold discrimination logic: "water flow signal + dual-zone (discrimination tube 22 and water passage zone 11) water quality verification + water level monitoring in water passage zone 11 + AI / video verification." This logic enables the precise differentiation of seven typical operating conditions and the automatic switching and differentiated handling of these conditions. It addresses the shortcomings of existing technologies and provides a more comprehensive and reliable guarantee for the safety of water environment in road-sensitive areas.

[0104] Example 1: The present invention is used in an emergency toxic substance storage pool project on a highway that crosses a drinking water source protection area.

[0105] This project is located on the periphery of the core protection zone of a drinking water source protection area. A highway traverses the area, which is ecologically sensitive, with an average daily traffic volume of approximately 20 hazardous waste transport vehicles. Therefore, the requirements for water environment risk prevention and control are extremely high. The specific implementation parameters for the method and system of this invention are as follows:

[0106] 1. Independent discrimination unit: Independent rainwater inlet 21 is set in the green belt outside the highway, 5m away from the road red line. The ground elevation of independent rainwater inlet 21 is 200mm higher than the road surface. The rainwater inlet size of independent rainwater inlet 21 is 300mm×300mm, with an internal stainless steel filter screen with an 8mm aperture. The discrimination pipe 22 is a DN150 HDPE pipe with a pipe slope of 0.008 and a length of 12m. The end is connected to the water passage area 11 of the toxic substance storage tank. The water flow sensor 23 is an infrared water flow sensor with a response time of 0.5s. The first water quality sensor 24 is a conductivity sensor with a measurement range of 0-20000μS / cm. The preset clean water range is ≤500μS / cm.

[0107] 2. Water Flow Area Monitoring Unit: The second water quality sensor 31 is the same model as the first water quality sensor 24. It is installed 30cm from the outlet of the inlet pipe of the water flow area 11 of the toxic gas storage tank. The water quality fluctuation judgment threshold is set to "conductivity change ≥ 20% within 30 minutes". The level gauge 32 adopts an immersion level sensor. The normal water level is set at 50cm from the bottom of the water flow area 11, and the alarm level is set at 75cm from the bottom of the water flow area 11. The distance between the two is 250mm, and the measurement accuracy is ±2mm.

[0108] 3. One-way check valve: The hydraulically driven check valve is linked with the control module and can close within 0.5 seconds under polluted conditions, ensuring reliable backflow prevention.

[0109] 4. Gate assemblies: The electric main gate 41 of the outlet gate has a nominal pressure of 1.0MPa, the sealing material is fluororubber, and the opening and closing time is 25s; the mechanical emergency auxiliary gate 42 is operated by a manual crank, and the opening and closing force is ≤50N; the toxic storage space gate 43 adopts an electric opening and closing method, with an opening and closing response time of 18s, and is equipped with an electromagnetic locking device, which automatically locks after opening in hazardous waste pollution scenarios.

[0110] 5. (AI / Video) Verification and Linkage Unit: Four high-definition cameras (IP66 protection level, with infrared function) are installed on both sides of the road and around the water inlet of the toxic waste storage tank. The AI ​​intelligent recognition module has a built-in hazardous waste vehicle feature database. The accuracy rate of hazardous waste vehicle rollover recognition is ≥96%, and the recognition response time is ≤2.5s.

[0111] 6. Control Module: It adopts a PLC controller, equipped with a 50W solar panel and a 50Ah battery. The dual power supply system ensures continuous power supply for 72 hours after a power outage. The status feedback unit transmits data to the remote monitoring platform through a 4G network, and the data storage time is 90 days. It has built-in differentiated emergency plan logic and supports the entry of verification results and gate locking / unlocking operations.

[0112] After the system was installed and debugged, it underwent a 6-month trial run. All performance indicators met the design requirements. The trial run results under seven operating conditions are as follows:

[0113] ① No-pollution rainwater operation: During multiple rainfall events, the water flow signal of the discrimination pipe 22 is triggered. The detection value of the first water quality sensor 24 is 320-480μS / cm (≤500μS / cm), and the fluctuation range of the detection value of the second water quality sensor 31 is <10%. After the liquid level in the water passage area 11 rises to 75cm (alarm level), the outlet gate opens within 25s, and the rainwater is discharged smoothly without water accumulation on the road. After the rainfall ends, the water flow signal disappears, the liquid level in the water passage area 11 drops to 50cm (normal water level), and the outlet gate closes automatically.

[0114] ② Initial Rainwater Pollution Condition: At the beginning of rainfall, the water flow signal of the discrimination pipe 22 is triggered. The first water quality sensor detects a value of 450 μS / cm (clean water), and the second water quality sensor detects a value that rises rapidly to 650 μS / cm (fluctuation range ≥20%). After the liquid level in the water passage area 11 rises to 75cm, the toxic waste storage space gate 43 opens, triggering an alarm signal. AI / video verification confirms that no hazardous waste has overturned. When the liquid level in the water passage area 11 rises to the alarm level, the toxic waste storage space gate 43 closes, and the outlet gate opens. After the rain stops, the initial rainwater is successfully intercepted and diverted to the nearby sewage pipe network.

[0115] ③ Pollution caused by the overturning of a hazardous waste vehicle in the early stage of rainfall: During rainfall, the water flow signal of the discrimination pipe 22 is triggered. The detection value of the first water quality sensor 24 is 430μS / cm (clean water), and the detection value of the second water quality sensor 31 rises sharply to 1500μS / cm (fluctuation range ≥20%). After the liquid level in the water-passing area 11 rises to 75cm, the toxic waste storage space gate 43 is opened, and the emergency alarm signal is triggered. The overturned hazardous waste vehicle is quickly identified and confirmed through AI / video verification, and the system immediately activates the emergency plan. All the runoff from the subsequent road surface is diverted into the toxic waste storage space 12 and is finally transferred and disposed of by a professional hazardous waste disposal vehicle. It is not discharged into the sewage pipe network.

[0116] ④ Normal Rainfall Water Quality Sudden Change Scenario: During the middle of the rainfall, the water quality is stable in the initial stage (the detection value of the first water quality sensor 24 is 440 μS / cm, and the detection value of the second water quality sensor 31 is 420 μS / cm). After the liquid level in the water passage area 11 rises to 75cm, the outlet gate opens. After normal drainage for 10 minutes, a water quality sudden change is simulated (the detection value of the second water quality sensor 31 rises to 800 μS / cm). The system urgently closes the outlet gate within 3 seconds, opens the toxic storage space gate 43, and issues an emergency alarm. The operation and maintenance personnel check the pollution source through video verification (simulating a sewage pipe rupture), activate the emergency plan for disposal, and there is no pollution water discharge.

[0117] ⑤ Wastewater Intrusion Detection Pipe Operation: Simulated local wastewater (conductivity 800μS / cm) flows into the detection pipe 22, triggering a water flow signal. The first water quality sensor 24 identifies it as wastewater, and the system immediately closes the outlet gate and alarms, notifying inspection personnel to investigate. Subsequently, simulated wastewater continues to flow in. After the liquid level in the water passage area 11 rises to 75cm, the toxic storage space gate 43 automatically opens to intercept the wastewater. After the inspection personnel investigate and seal the wastewater discharge outlet, the water quality returns to normal, and the gate resets.

[0118] ⑥ Non-rainy day sewage intrusion condition: No water flow signal (non-rainy day), simulated hazardous chemical (conductivity 1200μS / cm) leakage, causing the second water quality sensor 31 to detect a sudden change in water quality in the inlet pipe. After the liquid level in the water passage area 11 rises to 75cm, the toxic space gate 43 opens, triggering an emergency alarm signal. The operation and maintenance personnel confirm the source of pollution through AI / video verification and investigation; the system activates the emergency plan, and the leaked hazardous chemical water is transferred and disposed of by professional vehicles, without arbitrary discharge.

[0119] ⑦ Non-rainy day clear water runoff condition: No water flow signal, simulates surface runoff from road surface erosion (conductivity 380μS / cm). After the liquid level in the water passage area 11 rises to 75cm, the outlet gate opens and the runoff is discharged normally. After the liquid level in the water passage area 11 drops to 50cm, the outlet gate closes and there is no water accumulation.

[0120] This invention, through its "four-fold discrimination logic + seven-level detailed operating condition + differentiated treatment" design, overcomes the limitations of existing road emergency toxic waste storage tank operating condition switching technologies. It effectively solves the core problems of traditional systems, such as single discrimination, delayed response, high misjudgment rate, and lack of differentiated treatment, achieving full coverage, accurate identification, and efficient treatment of various road water environment risk scenarios. Through an AI / video verification linkage mechanism, this invention accurately distinguishes between initial rainwater pollution and hazardous waste spillage pollution, providing dedicated treatment paths for different pollution scenarios. This ensures smooth conventional drainage while minimizing water environment risks in sensitive areas. The system structure is simple, reliable, and has low maintenance costs. It effectively enhances the water environment risk prevention and control capabilities in sensitive road areas, providing strong protection for the ecological security of drinking water source protection areas and important wetlands. It is applicable to various newly built, renovated, and expanded road emergency toxic waste storage tank projects crossing sensitive areas, and has broad application prospects and promotional value.

[0121] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for switching control of road emergency toxic substance storage tanks based on rainwater discrimination and water level monitoring, characterized in that: Includes the following steps: Step 1: Provide a road emergency toxic substance storage tank switching control system based on rainwater identification and water level monitoring, and initialize the system for standby; Step 2: The system uses an independent discrimination unit to determine whether a water flow signal is detected. If yes, proceed to step 3; otherwise, proceed to step 8. Step 3: The system uses an independent discrimination unit to determine whether the water flow is clean water. If it is, proceed to step 4; otherwise, proceed to step 7. Step 4: The system uses the water flow area monitoring unit to determine if there are fluctuations in water quality. If yes, proceed to step 5; otherwise, proceed to step 6. Step 5: The system determines that the rainwater is unpolluted and implements corresponding countermeasures; Step 6: The system determines that the pollution is due to rain and executes corresponding countermeasures; Step 7: The system determines that the sewage intrusion detection pipe (22) is located and executes the corresponding countermeasures; Step 8: The system uses the water flow area monitoring unit to determine if there are fluctuations in water quality. If yes, proceed to step 9; otherwise, proceed to step 10. Step 9: The system determines that the intrusion is due to sewage on a non-rainy day and executes corresponding countermeasures; Step 10: The system determines that the runoff is clean water from a non-rainy day and implements corresponding countermeasures.

2. The method for switching control of road emergency toxic gas storage tanks based on rainwater discrimination and water level monitoring according to claim 1, characterized in that: The system includes a toxic storage tank body, an independent discrimination unit, a water passage area monitoring unit, a control module, and a verification and linkage unit; the toxic storage tank body includes a water passage area (11) and a toxic storage space (12) connected by several toxic storage space gates (43). The inlet of the water passage area (11) is connected to the water inlet system (5) through a one-way check valve, and the outlet of the water passage area (11) is connected to the downstream drainage system (6) through an outlet gate; the independent discrimination unit includes an independent rainwater inlet (21), a discrimination pipe (22), a water flow sensor (23), and a first water quality sensor (24). The independent rainwater inlet (21) is located in a non-road area. One end of the discrimination tube (22) is connected to the independent rainwater inlet (21), and the other end of the discrimination tube (22) is connected to the water passage area (11). The water flow sensor (23) and the first water quality sensor (24) are both installed in the discrimination tube (22) and connected to the control module. The verification linkage unit is installed on both sides of the road and around the water inlet of the water passage area (11) and connected to the control module. The water passage area monitoring unit includes a second water quality sensor (31) and a level gauge (32) connected to the control module. The second water quality sensor (31) is installed at the water inlet of the water passage area (11), and the level gauge (32) is arranged in the water passage area (11).

3. The method for switching control of road emergency toxic gas storage tanks based on rainwater discrimination and water level monitoring according to claim 2, characterized in that: The independent rainwater inlet (21) is set at an elevation 100-300mm higher than the surrounding road surface and has a built-in filter screen; the outlet gate includes an electric main gate (41) and a mechanical emergency auxiliary gate (42), forming a dual-level redundant structure; the verification linkage unit includes a clear camera and / or an AI intelligent recognition module.

4. The method for switching control of road emergency toxic gas storage tanks based on rainwater discrimination and water level monitoring according to claim 1, characterized in that: Step 5 includes the following sub-steps: Step 51: The level gauge (32) of the water-passing area monitoring unit monitors the liquid level in the water-passing area (11) of the toxic storage tank in real time, and sends an alarm signal to the control module when the liquid level in the water-passing area (11) reaches the alarm level. Step 52: The control module controls the outlet gate to open, and the water flow in the water passage area (11) is discharged to the downstream drainage system (6) through the outlet gate. Step 53: When the water flow sensor (23) does not detect a water flow signal and the level gauge (32) monitors the water level in the water-passing area (11) and it drops to the preset normal water level, the outlet gate is closed and the system returns to standby. Otherwise, the outlet gate is kept open to drain water.

5. The method for switching control of road emergency toxic gas storage tanks based on rainwater discrimination and water level monitoring according to claim 4, characterized in that: During the process of opening the outlet gate to drain water, the system uses the second water quality sensor (31) of the water flow area monitoring unit to detect the water quality in the water flow area (11) of the toxic storage tank body in real time, and determines whether there is water quality fluctuation during the drainage process. If not, the outlet gate is kept open to drain water; if so, it is determined to be a sudden change in water quality during normal rain and corresponding countermeasures are implemented. The response measures for sudden changes in water quality during normal rain are as follows: the control module controls the outlet gate to close urgently and opens the toxic storage space gate (43) so that the water in the water flow area (11) flows into the toxic storage space (12) through the toxic storage space gate (43); at the same time, the control module triggers the verification linkage unit, and the operation and maintenance personnel check the pollution source through the verification linkage unit and start the emergency plan to treat the pollutants according to the pollution type. After the treatment is completed, the system returns to standby.

6. The method for switching control of road emergency toxic gas storage tanks based on rainwater discrimination and water level monitoring according to claim 1, characterized in that: Step 6 includes the following sub-steps: Step 61: The level gauge (32) of the water-passing area monitoring unit monitors the liquid level in the water-passing area (11) of the toxic storage tank in real time, and sends an alarm signal to the control module when the liquid level in the water-passing area (11) reaches the alarm level. Step 62: The control module controls the opening of the gas storage space gate (43) and triggers the verification linkage unit. The operation and maintenance personnel use the verification linkage unit to determine whether there are any hazardous waste vehicles overturned on the road. If yes, then step 63 is executed; otherwise, step 64 is executed. Step 63: The system determines that the pollution is caused by initial rainwater runoff and implements corresponding countermeasures; The initial rainwater pollution response measures are as follows: the control module controls the toxic storage space gate (43) to close and opens the outlet gate; after the water flow sensor (23) detects no water flow signal in the discrimination tube (22), that is, after the rain stops, the sewage in the toxic storage space (12) is intercepted to the sewage pipe network, and the system is restored to standby. Step 64: The system determines that the pollution is caused by a hazardous waste vehicle overturning during the initial stage of rainfall and implements corresponding countermeasures; The measures to deal with pollution caused by hazardous waste vehicles overturning during the initial stage of rainfall are as follows: activate the emergency response plan, use specialized vehicles to transfer and dispose of the overturned vehicles, and only after maintenance personnel confirm that the disposal has met the standards can the control module open the outlet gate and the system return to standby.

7. The method for switching control of road emergency toxic gas storage tanks based on rainwater discrimination and water level monitoring according to claim 1, characterized in that: The measures to deal with the sewage intrusion detection pipe (22) are as follows: the control module controls the outlet gate to close and notifies the on-site inspection personnel to conduct on-site inspection; at the same time, the level gauge (32) of the water flow area monitoring unit monitors the liquid level in the water flow area (11) of the toxic storage tank body in real time, and determines whether the liquid level in the water flow area (11) has reached the alarm level. If not, it continues to monitor; if so, it is determined to be sewage confluence. The control module keeps the outlet gate closed and opens the toxic storage space gate (43) to intercept sewage, so that sewage flows into the toxic storage space (12) through the toxic storage space gate (43); after the on-site inspection personnel have completed the treatment and confirmed that the treatment has met the standards, the control module opens the outlet gate and closes the toxic storage space gate (43), and the system returns to standby.

8. The method for switching control of road emergency toxic substance storage tanks based on rainwater discrimination and water level monitoring according to claim 1, characterized in that: The measures to deal with sewage intrusion on non-rainy days are as follows: The level gauge (32) of the water-passing area monitoring unit monitors the level in the water-passing area (11) of the toxic storage tank in real time, and determines whether the level in the water-passing area (11) has reached the alarm level. If not, it continues to monitor. If so, the control module controls the outlet gate to close and opens the toxic storage space gate (43). At the same time, the verification linkage unit is triggered. The operation and maintenance personnel check the pollution source through the verification linkage unit and start the emergency plan. The pollutants are disposed of according to the type of pollution. After the disposal is completed, the control module opens the outlet gate and closes the toxic storage space gate (43). The system returns to standby.

9. The method for switching control of road emergency toxic gas storage tanks based on rainwater discrimination and water level monitoring according to claim 1, characterized in that: The measures to deal with the runoff of clean water on non-rainy days are as follows: The level gauge (32) of the water flow monitoring unit monitors the level in the water flow area (11) of the toxic storage tank in real time, and determines whether the level in the water flow area (11) has reached the alarm level. If not, it continues to monitor. If so, the control module opens the outlet gate, and the water flow in the water flow area (11) is discharged to the downstream drainage system (6) through the outlet gate. When it is determined that the level in the water flow area (11) has dropped to the normal water level, the outlet gate is closed and the system is put back into standby mode.

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