JP7362520B2 - Flow path control system, flow path control method and program - Google Patents

Description

The present invention relates to a flow path control system, a flow path control method, and a program.

Some of the rainwater percolates into the soil, but much of it passes through multiple sewers and is discharged into rivers. The amount of liquid that passes through the sewer pipes per hour largely depends on the cross-sectional area of the pipes. Applying this to rivers would mean expanding river channels, but this is difficult to achieve, especially in urban areas. For this reason, in urban areas, many designs are being made to increase the length of sewer pipes and extend the time it takes for rainwater to be discharged from the sewers to rivers.

As a related technology, Patent Document 1 describes a system in which rainwater is taken in and stored in a water storage tank, and when the amount of rainwater flowing into the water storage tank is below a certain level, a control valve is held in an open state to allow the rainwater to flow into a river. When the amount of rainwater flowing into the water storage tank exceeds a certain amount due to torrential rain, etc., the control valve is closed to prevent the rainwater from flowing into the river. A river flooding prevention system has been disclosed that causes rainwater to seep into the ground outside from a wall surface and diffuse.

Patent Document 2 describes a method of controlling rainfall in river management operations that prevents flood damage in small rivers by connecting drainage channels and small rivers with large rivers through spillways and controlling the amount of water flowing into the flood channels. It describes a river operation method that predicts the water level of each small river based on the amount of water and changes the pre-prepared operation plan for the spillway if the water level rises.

Japanese Patent Application Publication No. 2001-98522 Japanese Patent Application Publication No. 8-180109

A method of increasing the length of sewer pipes and extending the time it takes for rainwater to be released into rivers is to prevent the rain from prolonging and to ensure that the water level in the river has already fallen by the time rainwater reaches the river from sewers. It is effective if you are doing so. However, if the rain continues for a long time and the water level of the river does not fall, even if the time until release is extended, the rainwater in the sewage channel cannot be released into the river, and the water volume in the sewage channel will exceed the allowable range. there is a possibility. Even when the length of sewer pipes is increased, rather than uniformly delaying the time for rainwater to reach the river, the timing for rainwater to reach the river from the sewer can be adjusted appropriately depending on the amount of water in the river and sewer. If this can be controlled, it is possible to minimize the effects of increased river water levels.

Therefore, an object of this disclosure is to provide a flow path control system, a flow path control method, and a program that can solve the above-mentioned problems.

According to one aspect of the present disclosure, a flow path control system includes a main stream and a tributary stream that is connected to the main stream and discharges rainwater into the main stream, and the tributary stream includes a main stream that controls the flow of rainwater. , a control system for a rainwater flow path, which is provided with a control mechanism for changing the timing of rainwater discharge into the main stream, and for determining the water volume of the main stream and the risk that the water volume of the main stream exceeds a permissible range. The timing of release from the tributary to the main stream is determined based on a first threshold of , a water volume of the tributary, and a second threshold for determining the risk of the water volume of the tributary exceeding an allowable range. a determining unit; and a control unit that controls the control mechanism based on the determination, and the first route takes the shortest time until rainwater reaches the main stream, and the first route takes the shortest time. and a longer second route is provided in the tributary stream, and when rainwater can be discharged into the main stream through any one of the routes under the control of the control mechanism, the control unit If the amount of water in the main stream is less than the first threshold and the amount of water in the tributary is less than the second threshold, the control mechanism is controlled so that rainwater passes through the second path, and the amount of water in the main stream is When the amount of water in the tributary reaches or exceeds the second threshold while being less than the first threshold, the determining unit determines to release rainwater from the tributary to the main stream in the shortest time, and the control unit: The control mechanism is controlled so that rainwater passes through the first path.

According to one aspect of the present disclosure, a flow path control method includes a main stream and a tributary stream that is connected to the main stream and discharges rainwater into the main stream, and the tributary stream is provided with a stream by controlling the flow of rainwater. , a flow path control system for a rainwater flow path, which is provided with a control mechanism for changing the timing of rainwater discharge into the main stream, determines the amount of water in the main stream and the risk that the amount of water in the main stream exceeds a permissible range; The timing of release from the tributary to the main stream is determined based on a first threshold of , a water volume of the tributary, and a second threshold for determining the risk of the water volume of the tributary exceeding an allowable range. and a step of controlling the control mechanism based on the determination, a first route in which the time required for rainwater to reach the main stream is the shortest, and the time is shorter than the first route. If the tributary stream is provided with a longer second route, and rainwater can be discharged into the main stream through any one of the routes under the control of the control mechanism, the amount of water in the main stream is equal to or smaller than the second route. 1 threshold and the amount of water in the tributary is less than the second threshold, the controlling step controls the control mechanism so that rainwater passes through the second path, and the amount of water in the main stream is less than the second threshold. If the amount of water in the tributary reaches or exceeds the second threshold while the amount of water in the tributary is less than the first threshold, the determining step determines to release rainwater from the tributary to the main stream in the shortest time, and the controlling step Accordingly, the control mechanism controls the rainwater so that it passes through the first path.

According to one aspect of the present disclosure, the program includes a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary includes a main stream that flows through the main stream by controlling the flow of rainwater. The computer of the flow path control system for the rainwater flow path, which is provided with a control mechanism for changing the timing of rainwater discharge to determining the timing of release from the tributary to the main stream based on a first threshold, the amount of water in the tributary, and a second threshold for determining the risk of the amount of water in the tributary exceeding an allowable range; and a step of controlling the control mechanism based on the determination, a first route that takes the shortest time for rainwater to reach the main stream, and a second route that takes the time longer than the first route. and a route is provided in the tributary stream, and rainwater can be discharged into the main stream through any one of the routes under the control of the control mechanism, if the amount of water in the main stream is less than the first threshold. If the amount of water in the tributary is less than the second threshold, the controlling step controls the control mechanism so that rainwater passes through the second path, and the amount of water in the main stream is less than the first threshold. When the amount of water in the tributary reaches the second threshold or more, the determining step determines to release rainwater from the tributary to the main stream in the shortest time, and the controlling step determines that the rainwater is A process for controlling the control mechanism to follow the first route is executed.

According to the present disclosure, it is possible to suppress an increase in the amount of water in a sewage channel or a river beyond an allowable range, and the effects of the increase in water.

It is a diagram showing an example of a flow path control system in one embodiment. It is a figure showing an example of flow control in one embodiment. It is a figure showing an example of the type of water level modes in one embodiment. It is a figure showing an example of a flow path in one embodiment. It is a flowchart which shows an example of the process of mode 3C in one embodiment. 3 is a flowchart illustrating an example of mode 3B processing in one embodiment. 12 is a flowchart illustrating an example of mode 2C processing in one embodiment. 3 is a flowchart illustrating an example of mode 2B processing in one embodiment. It is a flowchart which shows an example of the process of mode 1C in one embodiment. 3 is a flowchart illustrating an example of processing in mode 1B in one embodiment. It is a flowchart which shows an example of the process of mode 3A in one embodiment. It is a flowchart which shows an example of the process of mode 2A, 1A in one embodiment. It is a diagram showing an example of the hardware configuration of a control device in one embodiment.

<Embodiment>
Information management methods according to each embodiment of the present disclosure will be described below with reference to FIGS. 1 to 13.
(composition)
FIG. 1 is a diagram illustrating an example of a flow path control system in one embodiment.
As shown in FIG. 1, the flow path control system 1 includes a control device 10 and a control mechanism V that is provided in the sewage channel d1 and controls the timing of releasing sewage into the river r1. The sewer d1 is laid underground in a city area or the like, and discharges sewage such as rainwater and sewage to the river r1. The sewer waterway d1 is branched into a detour path d1a and a direct connection path d1b. The detour d1a is a route provided to increase the distance to the river r1, and the direct connection route d1b is a route that discharges rainwater over the shortest distance to the river r1. The control mechanism V is provided near the branch point of the detour path d1a and the direct connection path d1b in the sewer waterway d1. The control device 10 controls the operation of the control mechanism V. For example, the control mechanism V includes a valve V1 and a valve V2, and when the valve V1 is closed and the valve V2 is opened, rainwater flowing in the sewer d1 flows to the detour d1a and reaches the river r1. On the other hand, when the control device 10 opens the valve V1 and closes the valve V2, the rainwater flowing through the sewer d1 flows to the direct connection path d1b and reaches the river r1. When rainwater flows through the detour d1a, the amount of water that can be stored in the sewer channel d1 increases compared to when rainwater flows through the direct connection path d1b, and it takes time for the rainwater to reach the river r1. For example, if the water level of river r1 rises due to temporary heavy rain and the amount of rainwater flowing through the sewer d1 increases, if the water level of the river r1 decreases while the rainwater flows through the detour d1a, the rainwater will be By flowing the water to the detour d1a, it is possible to prevent the amount of water in the river r1 from exceeding the allowable range.

On the other hand, if there is enough time for the water level of the river r1 to reach the threshold and the amount of rainwater flowing through the sewer d1 is greater than the threshold, the rainwater is flowed to the direct connection path d1b and promptly discharged to the river r1. It is possible to prevent the amount of water in the sewer d1 from exceeding the allowable range.

Moreover, when the valve V1 and the valve V2 are closed, the discharge of rainwater from the sewer channel d1 to the river r1 can be stopped. When the water level of the river r1 is likely to exceed the limit, by stopping the discharge of rainwater into the river r1, it is possible to prevent the water amount of the river r1 from exceeding the allowable range.

The control device 10 includes a data acquisition section 11, a determination section 12, a control section 13, and a storage section 14.
The data acquisition unit 11 acquires data regarding the water level of the river r1 and the amount of water flowing through the sewer d1. For example, the data acquisition unit 11 acquires the measured amount of rainfall in the area through which the river r1 and the sewer d1 flow, and the measured value of the water level of the river r1.

The determining unit 12 estimates the risk that the water volume of the river r1 and the sewer d1 will exceed the allowable range based on the rainfall information acquired by the data acquiring unit 11, and determines the flow path of rainwater in the sewer d1. decide. For example, if the water level of the river r1 is equal to or higher than the threshold for determining the risk of the water amount exceeding the allowable range, and the water level of the sewer d1 is less than the threshold, the determining unit 12 directs the flow from the sewer d1 to the river r1. It is determined that the control mechanism V should be controlled so that rainwater does not flow into the river r1, or if a decrease in the water level of the river r1 is expected, the rainwater flows to the river r1 through the detour d1a. For example, if the water level in the river r1 is less than the threshold and the water level in the sewer d1 is above the threshold, the determining unit 12 determines to control the control mechanism V so that rainwater flows to the direct connection path d1b. For example, if the water level of the river r1 and the water level of the sewer d1 are both equal to or higher than the threshold value, the determining unit 12 determines to control the control mechanism V so that the influence of the increased water level is reduced.

The control unit 13 controls the control mechanism V according to the determination by the determination unit 12.
The storage unit 14 stores logic used by the determination unit 12 to determine switching of the control mechanism V, information on rainfall acquired by the data acquisition unit 11, and the like.

Next, the configuration and control of the control mechanism V will be explained. FIG. 2 is a diagram illustrating an example of flow rate control in one embodiment.
The control mechanism V is composed of water stop plates V1 to V4 and locks A to F. One end of each of the water stop plates V1 to V4 is rotatable about the other end fixed to the wall surface of the sewer channel d1. The control unit 13 controls the operations of locks A to F.
FIG. 2(a) shows an example of setting the water stop plates V1 to V4 that cause rainwater to flow to the detour d1a. In FIG. 2(a), one end of the waterstop plates V1, V2, and V4 is fixed to the wall of the sewer d1 by locks A, B, and F, respectively, so as not to block the flow of rainwater. One end of the waterstop plate V3 is fixed by a lock D so as to block rainwater from entering the direct connection path d1b. FIG. 2(a) shows the state of the water stop plates V1 to V4 at normal times. That is, during normal times, rainwater reaches the river r1 via the detour d1a.

Here, the determining unit 12 determines, for example, that there is sufficient water level in the river r1 and that the amount of water flowing through the sewer d1 is expected to exceed the threshold, and promptly releases rainwater to the river through the direct connection path d1b. decide to do so. Based on this determination, the control unit 13 releases lock A and lock D. Then, the water stop plate V1 and the water stop plate V3 are rotated by the water flow, the water stop plates V1 to V4 change to the state shown in FIG. 2(b), and the rainwater is discharged into the river r1 through the direct connection path d1a. .

Next, depending on the rise in the water level of the river r1 and the situation of other sewage channels, the determining unit 12 releases rainwater to the river r1 via the detour d1b (by discharging water from this area, the water level of the river r1 rises). decide to postpone something. The control unit 13 releases lock B and lock E. Then, the waterstop plates V1 to V4 transition to the state shown in FIG. 2(c), and rainwater begins to flow to the detour d1b.

Next, when the water level of the river r1 rises and it is determined that water discharging from this area cannot be continued, the determining unit 12 determines to release the lock F, for example. When the control unit 13 releases the lock F, the state changes to the state shown in FIG. 2(d), and rainwater is stored in the sewer d1. Inland water flooding will occur if the sewer d1 can no longer hold the rainwater, but if there is a system in place to channel and store overflowing rainwater in parks, reservoirs, fields, and other water retarding areas in the area where the sewer d1 is installed, This system is used to collect rainwater.

Thereafter, when it is determined that the amount of water that can be accepted in the retarding basin approaches the limit and that the influence of increased water will occur in this area, the determining unit 12 determines to release rainwater to the river r1 in an emergency or detour manner. In the case of emergency release, the control unit 13 releases the lock C. Then, the state changes to the state shown in FIG. 2(e-1), and rainwater is discharged into the river r1 through the direct connection path d1b. When releasing in a roundabout way, the control unit 13 releases the lock G. Then, the state changes to the state shown in FIG. 2(e-2), and the rainwater is discharged to the river r1 via the detour d1a.

In this way, the detour path d1a and the direct connection path d1b are connected to the sewer waterway d1, and the control mechanism V is provided at the connecting portion. Then, the flow path of rainwater is switched by the control mechanism V according to the water levels of the river r1 and the sewer waterway d1. Changing the flow path is equivalent to changing the delivery time of rainwater to the river, so controlling the flow path of the sewer can make the most of the drainage capacity of the river.

For example, there are independent sewers d1-A, d1-B, and d1-C in District A, District B, and District C, and these are connected to the same river r1. Each of the sewer channels d1-A, d1-B, and d1-C is connected to a direct connection channel d1b-A. d1b-B, d1b-C, and the detour d1a-A. It is equipped with d1a-B and d1a-C. When the risk of the water volume exceeding the allowable range in the sewage channel d1-A of the A district is highest, the control device 10 switches the control mechanism V-A to give priority to the drainage of the A district. Rainwater from the sewer d1-A is immediately drained into the river r1 through the direct connection road d1b-A, and during this time, rainwater from the B and C areas is drained from the detours d1a-B and d1a-C to the river r1. Next, if a district occurs where the risk of the water volume of the sewers exceeding the permissible range has increased (designated as district B), rainwater from the sewers d1-B in district B will be transferred to river r1 through the direct connection road d1b-B. During this period, water will be drained from the detours d1a-A and d1a-C to the river r1 in areas A and C.

In this way, according to the flow path control system 1, by controlling the timing of releasing rainwater from the sewer channel d1 to the river r1, the drainage capacity of the river can be utilized to the maximum. Further, if it is determined that drainage cannot be carried out in any area based on the situation of the river r1, the discharge to the river r1 can be stopped and rainwater can be directed to a retarding area such as a park. By providing a retarding basin, even if an inland flood occurs, it is possible to suppress the scale of the flood.

Next, the concepts of flow path, main stream, and tributary stream will be introduced, and the switching pattern of the control mechanism V will be explained.
<Premise>
(1) The flow path consists of a main stream and a tributary stream. The main stream connects with multiple tributaries, and the tributaries end at the main stream. Water flows from the tributaries to the main stream (if the amount of water in the main stream is large, it may flow backwards from the main stream to the tributaries). For example, the main stream is a river and the tributaries are sewers. Further, for example, the main stream is a main river, and the tributary is a river that joins the main stream.

(2) If rainwater flows into a channel at a flow rate that exceeds the allowable range, inland flooding will occur.
(3) The magnitude of the impact when water flow exceeds the allowable range for each main stream and tributary stream has been quantified. For example, if the water volume of the main stream exceeds the permissible range, the impact size is 10, if the water volume of tributary 1 exceeds the permissible range, the impact size is 5, and if the water volume of tributary 2 exceeds the permissible range, the impact size is 10. Information indicating that the magnitude of the influence is 2, etc. is registered in advance in the storage unit 14.

(4) The data acquisition unit 11 acquires rainfall information. Rainfall information is the total amount of rain that has fallen so far by district. The determining unit 12 estimates the current water levels of the main stream and tributaries based on the rainfall information, and determines whether there is a risk that the water amount will exceed the allowable range. When a water level gauge is installed in the main stream or a tributary, the data acquisition unit 11 acquires water level information from the water level gauge, and the determining unit 12 determines the risk of the water amount exceeding the allowable range based on this water level information. may be determined.

(5) The data acquisition unit 11 acquires rainfall prediction information. The rainfall prediction information is a predicted value of the future rainfall amount for each district (for example, the amount of rainfall every hour). The determining unit 12 predicts the future water levels of the main stream and tributaries based on the rainfall prediction information, and predicts the risk that the water amount will exceed the allowable range.

(6) The water level of the main stream is classified into levels 1 to 3, and the water level of the tributaries is classified into levels A to C, and the determining unit 12 determines whether to discharge from the tributary to the main stream according to the combination of the water levels of the main stream and the tributary. If the tributary has a direct connection path and a detour, it is determined whether the water should be discharged into the main stream through the detour.

(7) Figure 3 shows the combination pattern of water levels of the main stream and tributaries. FIG. 3 is a diagram illustrating an example of the types of water level modes in one embodiment. Water level 1 of the main stream indicates that it can accept water from the tributary without restrictions, water level 2 indicates that it can accept water from the tributary with restrictions, and water level 3 indicates that it cannot accept water from the tributaries. Indicates a possible state. Water level A of a tributary indicates a state in which water can be drawn in from the main stream and stored, water level B indicates a state in which discharge to the main stream can be temporarily stopped, and water level C indicates a state in which water can be discharged to the main stream. If this is not done, there is a high possibility that the amount of water in the tributary will exceed the allowable range. As shown in FIG. 3, there are nine water level combination patterns: modes 3C, 3B, 3A, 2C, 2B, 2A, 1C, 1B, and 1A.

Next, a flow path control method in each mode will be described using the configuration of FIG. 4 as an example.
FIG. 4 is a diagram showing an example of a flow path in one embodiment.
The flow path 100 in FIG. 4 is composed of a main stream M1, a tributary stream B1, and a tributary stream B2. Rainwater flowing through the tributaries B1 and B2 flows into the main stream M1. The tributary stream B1 is provided with a detour path B1a and a direct connection path B1b, and the flow of rainwater is switched by a control mechanism V10. The tributary stream B2 is provided with a detour path B2a and a direct connection path B2b, and the flow of rainwater is switched by a control mechanism V20. The control device 10 controls the control mechanisms V10 and V20. The control mechanism V10 is controlled so that rainwater flowing in the tributary stream B1 flows to the main stream M1 through the detour B1a during normal times. The control mechanism V20 is controlled so that water flowing in the tributary stream B2 flows to the main stream M1 through the detour B2a during normal times.

Further, a bypass passage B12 connecting the tributary stream B1 and the tributary stream B2 is provided, and a valve V11 for controlling the inflow amount of rainwater from the tributary stream B1 to the bypass passage B12, a valve V11 and a tributary stream B2 are provided at the connection part of the tributary stream B1 and the bypass passage B12. A valve V12 that controls the amount of rainwater flowing from the tributary stream B2 into the bypass path B12 is provided at the connecting portion of the bypass path B12. During normal times, the valves V11 and 12 are fully closed and controlled so that rainwater does not flow into the bypass path B12. The control unit 13 controls opening and closing of the valves V11 and 12.

(Mode 3C)
FIG. 5 is a flowchart illustrating an example of processing in mode 3C in one embodiment.
If the information indicating the water levels of the main stream M1 and tributaries B1 and B2 acquired by the data acquisition unit 11 are all equal to or higher than the threshold, the determining unit 12 determines that the amount of water in any of the main stream M1 and tributaries B1 and B2 exceeds the allowable range. It is determined that the mode is mode 3C, in which there is a high possibility that this will occur. When determining the mode 3C, the determination unit 12 determines whether there is an acceptable tributary (step S11). For example, in a district where the tributary B1 flows, if there is a mechanism to store water in a retarding area such as a park even if inland water actually floods, the determination unit 12 determines that the tributary B1 can accept water. The presence or absence of a retarding basin is registered in advance in the storage unit 14 in association with information on the tributaries B1 and B2.

If there is an acceptable tributary (step S11; Yes), the determining unit 12 determines to accept the tributary B1 (step S12). Specifically, the determining unit 12 determines to control the control mechanism V10 in the acceptable tributary B1 so that rainwater does not flow into either the detour B1a or the direct connection B1b. Alternatively, the determining unit 12 determines to allow the rainwater to flow into the direct connection path B1b, thereby allowing it to flow backward from the main stream M1 to the tributary stream B1. The control unit 13 controls the control mechanism V10 according to the determination by the determination unit 12. Thereby, the discharge of water from the tributary stream B1 to the main stream M1 is stopped. Alternatively, rainwater flows backward from the mainstream M1 to the tributary B1. After a while, when the retarding basin approaches the acceptable capacity, the determining unit 12 determines to release the same amount of water as the received water from the accepted tributary B1 (step S13). Specifically, the determining unit 12 determines to discharge water through the direct connection path B1b. The control unit 13 controls the control mechanism V10 to release the amount of water received at the retarding basin to the main stream M1 through the detour B1a.

If there are no acceptable tributaries (step S11; No), the determining unit 12 compares the magnitude of the impact when the water amount exceeds the allowable range in each tributary (step S14). Specifically, the determining unit 12 compares the magnitude of the influence of the tributary stream B1 and the tributary stream B2 registered in the storage unit 14 when their water amounts exceed. The determining unit 12 determines acceptance at the tributary where the influence is minimal (step S15). For example, if the influence on tributary B2 is smaller than on tributary B1, the determining unit 12 determines acceptance in tributary B2. In other words, the amount of water in the tributary B2 is allowed to exceed the allowable range. Specifically, the determining unit 12 determines to control the control mechanism V20 so that rainwater does not flow into either the detour B2a or the direct connection path B2b in the tributary B2. The control unit 13 controls the control mechanism V20 according to the determination by the determination unit 12. Thereby, the discharge of water from the tributary stream B2 to the main stream M1 is stopped.

(Mode 3B)
FIG. 6 is a flowchart illustrating an example of mode 3B processing in one embodiment.
The determining unit 12 determines that the information indicating the water level of the main stream M1 acquired by the data acquiring unit 11 is equal to or higher than a threshold value, and that it is possible to temporarily stop the discharge to the main stream M1 from either or both of the tributary stream B1 and tributary stream B2. If it is possible (the water level is higher than normal, but it is less than the threshold for determining the risk of the water amount exceeding the allowable range), it is determined that the mode is 3B. When the determining unit 12 determines that the mode is 3B, it determines to stop the discharge in the tributary stream where the discharge to the main stream M1 can be stopped (step S21). For example, assume that it is possible to temporarily stop discharging water from both the tributary stream B1 and the tributary stream B2 to the main stream M1. The control unit 13 controls the control device V10 so that rainwater in the tributary stream B1 is not released into the main stream M1. The control unit 13 controls the control device V20 so that rainwater in the tributary stream B2 is not released into the main stream M1.

Next, the determining unit 12 determines whether the water level of the main stream M1 is in a dangerous state (step S22). That is, the determining unit 12 determines whether the water level of the main stream M1 is equal to or higher than the threshold value based on the measured value of the water level of the main stream M1 and rainfall information. If it is determined that there is a risk that the water amount will exceed the allowable range (the water level is equal to or higher than the threshold value) (step S22; Yes), the control device 10 executes the process of mode 3C shown in FIG. 5 (step S23).

If it is determined that there is no risk of excess (the water level is less than the threshold) (step S22; No), the determining unit 12 determines whether there are tributaries B1 and B2 where there is a risk of the water volume exceeding the allowable range. (Step S24). The determining unit 12 determines the risk of the water volume exceeding the allowable range in the tributaries B1 and B2 based on the measured water levels and rainfall information of the tributaries B1 and B2. If it is determined that there is a risk of excess (step S24; Yes), the control device 10 executes the process of mode 3C shown in FIG. 5 (step S23). If it is determined that there is no risk of excess (step S24; No), the control device 10 monitors the water levels of the tributaries B1 and B2 based on rainfall information and rainfall prediction information (step S25).

(Mode 2C)
FIG. 7 is a flowchart illustrating an example of mode 2C processing in one embodiment.
The determining unit 12 determines that water can be accepted in the main stream M1 acquired by the data acquiring unit 11 (the water level is higher than normal, but it is less than the threshold for determining the risk of the water amount exceeding the allowable range), If there is a risk of overflow in both the tributary stream B1 and the tributary stream B2 (the water level is equal to or higher than the threshold value), it is determined that the mode is mode 2C. When determining the mode 2C, the determining unit 12 estimates the amount of water that can be accepted in the main stream M1 (step S31). For example, the determining unit 12 estimates the amount of water that can be accepted from the tributary B1 from the current water level of the main stream M1 downstream of the position where the tributary B1 is connected to the main stream M1, and if the amount of water that has bottomed out from the tributary B1 is accepted. , estimate the amount of water that can be accepted from tributary B2. The determining unit 12 determines to control the control mechanisms V10 and V20 so that rainwater is discharged to the main stream M1 through the direct connection path B1b in the tributary stream B1 and the direct connection path B2b in the tributary stream B2. The control unit 13 controls the control device V10 so that rainwater from the tributary stream B1 is discharged into the main stream M1 through the direct connection path B1b. The control unit 13 controls the control device V20 so that the rainwater of the tributary stream B2 is discharged into the main stream M1 through the direct connection path B2b (step S32).

When the amount of water estimated in step S31 is released to the main stream M1, the determining unit 12 checks the water level of the main stream M1 (step S33). When the water level of the main stream M1 is level 3, the determining unit 12 determines to stop discharging water from the tributaries B1 and B2 to the main stream M1 (step S34). The control unit 13 controls the control mechanisms V10 and V20 to stop discharging water from the tributaries B1 and B2 to the main stream M1.
When the water level of the main stream M1 is level 2, the determining unit 12 determines to continue discharging water from the tributaries B1 and B2 to the main stream M1 (step S35). When the water level of the main stream M1 is level 1, the determining unit 12 determines to expand the discharge from the tributaries B1 and B2 to the main stream M1 (step S36). When the determination unit 12 makes the determinations in steps S35 and S36, the control unit 13 leaves the control mechanisms V10 and V20 as they are and stops discharging water from the tributaries B1 and B2 to the main stream M1. After that, the determining unit 12 also checks the water level of the main stream M1 and executes control according to the water level of the main stream M1 (steps S34 to S36).

(Mode 2B)
FIG. 8 is a flowchart illustrating an example of mode 2B processing in one embodiment.
When the water level of the main stream M1 acquired by the data acquisition unit 11 is level 2, and the water levels of the tributaries B1 and B2 are level B, the determining unit 12 determines that mode 2B is selected. When determining the mode 2B, the determination unit 12 determines whether or not the amount of rainfall is expected to increase based on the rainfall prediction information acquired by the data acquisition unit 11 (step S41).

If the amount of rainfall is expected to increase (step S41; Yes), the determining unit 12 extracts flow paths (main stream M1, tributary B1, tributary B2) in which the allowable water amount is predicted to be exceeded. For example, the determining unit 12 determines, based on the current water levels of the main stream M1, tributary B1, and tributary B2 and the rainfall forecast information for each area, that there is a possibility that the amount of rainfall will increase in the area where the tributary B1 flows in the future and exceed the allowable water amount. If it is predicted that there is, the tributary stream B1 is extracted as a flow path in which the allowable water amount is predicted to be exceeded (step S42).

For example, when the main stream M1 is extracted (step S43; main stream), the determining unit 12 determines to stop discharging water from the tributaries B1 and B2 to the main stream M1 (step S44). The control unit 13 controls the control device V10 so that the rainwater in the tributary B1 is not released into the main stream M1, and controls the control device V20 so that the rainwater in the tributary B2 is not released into the main stream M1.

For example, when the tributary B1 is extracted (step S43; tributary), the determining unit 12 determines to release water from the tributary B1 to the main stream M1 (step S45). The control unit 13 controls the control device V10 so that rainwater from the tributary stream B1 is discharged into the main stream M1 through the direct connection path B1b.

When there is no expectation that the amount of rainfall will increase (step S41; No), the control device 10 monitors the water levels of the main stream M1, tributary stream B1, and tributary stream B2 based on rainfall information and rainfall prediction information (step S46).

(Mode 1C)
FIG. 9 is a flowchart illustrating an example of mode 2B processing in one embodiment.
Based on the information on the water levels of the main stream M1, tributary B1, and tributary B2 acquired by the data acquisition unit 11, the determining unit 12 determines that the water level of the main stream M1 is level 1, and the water level of tributary B1 or tributary B2 is level C (the water level is a threshold value). above), it is determined that the mode is 1C. For example, assume that the level of the tributary B1 is C. The determining unit 12 determines discharge from the tributary stream B1 whose water volume may exceed the allowable range to the main stream M1 (step S51). The control unit 13 controls the control device V10 so that rainwater from the tributary stream B1 is discharged into the main stream M1 through the direct connection path B1b. After that, the determining unit 12 monitors the water levels of the main stream M1, tributary stream B1, and tributary stream B2 (step S52).

(Mode 1B)
FIG. 10 is a flowchart illustrating an example of mode 1B processing in one embodiment.
Based on the information on the water levels of the main stream M1, tributary B1, and tributary B2 acquired by the data acquisition unit 11, the determining unit 12 determines that when the water level of the main stream M1 is level 1 and the water levels of tributary B1 and tributary B2 are level B or lower, The current state of the flow path 100 is determined to be mode 1B. For example, assume that the water level of the tributary B1 is B and the water level of the tributary B2 is C. When determining the mode 1B, the determination unit 12 determines whether or not the amount of rainfall is expected to increase based on the rainfall prediction information acquired by the data acquisition unit 11 (step S61).

If the amount of rainfall is expected to increase (step S61; Yes), the determining unit 12 determines to stop discharging water from the tributary stream B1, which has a large amount of water, to the main stream M1 (step S62). The control unit 13 controls the control device V10 so that rainwater from the tributary stream B1 is discharged to the main stream M1 through the direct connection path B1b.

If there is no expectation that the amount of rainfall will increase (step S41; No), the control device 10 monitors the water levels of the main stream M1, tributary stream B1, and tributary stream B2 based on rainfall information and rainfall prediction information (step S63).

(Mode 3A)
FIG. 11 is a flowchart illustrating an example of processing in mode 3A in one embodiment.
Based on the information on the water levels of the main stream M1, tributary B1, and tributary B2 acquired by the data acquisition unit 11, the determining unit 12 selects a mode when the water level of the main stream M1 is level 3 and the water levels of tributary B1 and tributary B2 are level A. It is determined to be 3A. When determining the mode 3A, the determining unit 12 determines acceptance in the tributary stream B1 and tributary stream B2 (step S71). The determining unit 12 determines to control the control devices V10 and V20 so that water is not released from the tributary stream B1 and the tributary stream B2 to the main stream M1. Alternatively, the determining unit 12 determines to allow the rainwater to flow into the direct connection path B1b, thereby allowing it to flow backward from the main stream M1 to the tributary stream B1. The control unit 13 controls the control device V10 so that the rainwater in the tributary B1 is not released into the main stream M1, and controls the control device V20 so that the rainwater in the tributary B2 is not released into the main stream M1. After that, the determining unit 12 checks the water level of the main stream M1 (step S72) and determines the mode again.

(Mode 2A, 1A)
FIG. 12 is a flowchart illustrating an example of processing in modes 2A and 1A in one embodiment.
Based on the information on the water levels of the main stream M1, tributary B1, and tributary B2 acquired by the data acquisition unit 11, the determining unit 12 determines whether the water level of the tributary B1 and the tributary B2 is level A, and the water level of the main stream M1 is level 2. If the water level of the main stream M1 is level 1, the mode is determined to be mode 2A. When the determining unit 12 determines that the mode is mode 2A or mode 1A, the control device 10 monitors the water levels of the main stream M1, tributary stream B1, and tributary stream B2 based on rainfall information and rainfall prediction information (step S81).

(Control of bypass path B12)
For example, assume that the amount of rainwater flowing through the tributary B1 is large and the amount of rainwater flowing through the tributary B2 is small. In this situation, the determining unit 12 decides to flow rainwater from the tributary stream B1 with a large amount of water to the tributary stream B2 with a small amount of water in each of the above modes (especially modes 1C, 2C, and 3C where there is no margin in the tributary). However, the control unit 13 may control the rainwater to flow from the tributary stream B1 to the tributary stream B2 through the bypass path B12 by opening the valves V11 and V12. For example, when the water level of tributary B1 is above the threshold and the water level of tributary B2 is below the threshold, valves V11 and V12 are opened to allow rainwater to flow from tributary B1 to tributary B2.

Even if the main stream M1 is a river and the tributaries B1 and B2 are a sewage channel connected to the river, or the main stream M1 is the main stream river and the tributaries B1 and B2 are rivers that flow into the main stream, the water level mode determination and control described above can be performed. Can be applied.
For example, if a tributary does not have a detour, a direct connection, or a mechanism to switch between them (for example, if a mainstream river is a main stream and a small river that joins the main stream is a tributary), the control device 10 controls the main stream and the tributary. The timing of discharge from the tributaries to the main stream is controlled by controlling the opening and closing of the water gates between the tributaries and the main stream.

In conventional control, tributaries often release rainwater unilaterally into the main stream, and the main stream simply receives the rainwater released from the tributaries. In contrast, according to the present embodiment, the supply of rainwater to channels (mainstream or tributary) where the water volume is likely to exceed the allowable range is suppressed, depending on the water volume of the main stream and tributaries, and It is possible to direct rainwater to channels with low water flow or channels where the impact of overflow is small. This makes it possible to minimize the impact of excess water in sewers and rivers.

FIG. 13 is a diagram illustrating an example of a hardware configuration of a control device in an embodiment of the present disclosure.
The computer 900 includes a CPU 901, a main storage device 902, an auxiliary storage device 903, an input/output interface 904, and a communication interface 905.
The above-described control device 10 is implemented in a computer 900. Each of the above-mentioned functions (data acquisition section 11, determination section 12, control section 13) is stored in the auxiliary storage device 903 in the form of a program. The CPU 901 reads the program from the auxiliary storage device 903, expands it to the main storage device 902, and executes the above processing according to the program. Further, the CPU 901 reserves a storage area in the main storage device 902 according to the program. Further, the CPU 901 secures a storage area in the auxiliary storage device 903 to store the data being processed according to the program. Note that the storage unit 14 is stored in an auxiliary storage device 903.

A program for realizing all or part of the functions of the control device 10 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed, thereby each functional unit is Processing may also be performed. Note that the "computer system" herein includes hardware such as an OS and peripheral devices. Furthermore, the term "computer system" includes the homepage providing environment (or display environment) if a WWW system is used. Furthermore, the term "computer-readable recording medium" refers to portable media such as CDs, DVDs, and USBs, and storage devices such as hard disks built into computer systems. Further, when this program is distributed to the computer 900 via a communication line, the computer 900 that received the distribution may develop the program in the main storage device 902 and execute the above processing. Further, the above program may be one for realizing a part of the above-mentioned functions, and further may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system. . Further, the control device 10 may be configured by a plurality of computers 900. The storage unit 14 may be stored in an external storage device separate from the computer 900.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present disclosure. Furthermore, the technical scope of this disclosure is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of this disclosure.

<Additional notes>
The flow path control system 1, flow rate control method, and program described in each embodiment can be understood, for example, as follows.

(1) The flow path control system 1 according to the first aspect includes a main stream M1 and tributaries B1 and B2 that are connected to the main stream and discharge rainwater into the main stream, and the tributaries B1 and B2 include: A control system 1 for a rainwater flow path 100 is provided with a control mechanism V that changes the timing of rainwater discharge into the main stream by controlling the flow of rainwater, the control system 1 for a rainwater flow path 100 controlling the water volume of the main stream M1 and the water volume of the main stream M1. A first threshold for determining the risk of the water volume exceeding the permissible range, a second threshold value for determining the water volume of the tributaries B1 and B2, and a risk that the water volume of the tributaries B1 and B2 exceeds the permissible range. A determining unit 12 that determines the timing of releasing rainwater from the tributaries B1 and B2 to the main stream M1 based on the threshold value, and a control unit 13 that controls the control mechanism based on the determination.
This makes it possible to minimize the increase in water volume beyond the allowable range in the main stream and tributaries, as well as the effects of increased water levels.

(2) The flow path control system 1 according to the second aspect is the flow path control system 1 according to (1), in which the determining unit 12 determines that the water volume of the main stream M1 is equal to or greater than the first threshold value, When the amount of water in the tributaries B1 and B2 is less than the second threshold, it is decided to postpone the release of rainwater from the tributaries B1 and B2 to the main stream, and the control unit 13 controls the amount of water in the tributaries B1 and B2. Under the control of the control mechanism V, the discharge from the tributary streams B1 and B2 to the main stream M1 is stopped.
Thereby, in the case of modes 3A and 3B, it is possible to prevent the amount of water in the main stream M1 from increasing beyond the allowable range.

(3) The flow path control system 1 according to the third aspect is the flow path control system 1 according to (1) to (2), in which the determining unit 12 determines that the amount of water in the main stream M1 is equal to or higher than the first threshold value. , and when the amount of water in the tributary streams B1 and B2 is equal to or greater than the second threshold and the tributary stream B1 flowing through the area where the retarding basin exists exists, from the tributary stream B1 flowing through the area where the retarding basin exists to the It is decided to postpone the release of rainwater to the main stream M1, and the control unit 13 controls the control mechanism V in the tributary stream B1 for which it has been decided to postpone the release of rainwater, to transfer the rainwater from the tributary stream B1 to the main stream M1. Stop the emission of.
When the water level is in mode 3C, the risk of excess water in the main stream M1 can be reduced by storing rainwater in the retarding basin and stopping the flow of rainwater from the tributary B1 to the main stream M1. As a result, it is possible to increase the possibility that rainwater can continue to be discharged from the other tributary stream B2 to the main stream M1.

(4) The flow path control system 1 according to the fourth aspect is the flow path control system 1 according to (1) to (3), in which the determining unit 12 determines that the amount of water in the main stream M1 is equal to or greater than the first threshold value. , and when the water volume of the tributary streams B1 and B2 is equal to or greater than the second threshold value, select the tributary stream B2 that has the least influence when the water volume exceeds the allowable range, and select the tributary stream B2 from the selected tributary stream B2 to the main stream M1. The control unit 13 controls the control mechanism V in the tributary stream B2 for which the postponement of the release of rainwater has been decided to postpone the release of rainwater from the tributary stream B2 to the main stream M1. stop,
When the water level is in mode 3C, the risk of excess water in the main stream M1 can be reduced by selecting tributary B2, which has the least effect on water increase, and stopping the flow of rainwater from tributary B2 to the main stream M1. As a result, it is possible to increase the possibility that rainwater can continue to be discharged from the other tributary stream B1 to the main stream M1.

(5) The flow path control system 1 according to the fifth aspect is the flow path control system 1 according to (1) to (4), in which the determining unit 12 determines that the amount of water in the main stream M1 is less than the first threshold value. If the amount of water in the tributary stream B1 is equal to or greater than the second threshold, it is determined to discharge rainwater from the tributary stream B1 to the main stream M1, and the control unit 13 controls the control mechanism V in the tributary stream B1. By control, rainwater is discharged from the tributary stream B1 to the main stream M1.
Thereby, in the case of mode 2C, it is possible to reduce the risk that the amount of water in the tributary stream B1 exceeds the allowable range.

(6) The flow path control system 1 according to the sixth aspect is the flow path control system 1 according to (5), in which the plurality of paths B1a and B1b are arranged such that the time required for rainwater to reach the main stream M1 is different. If the rainwater is provided in the tributary stream B1 and rainwater can be discharged into the main stream M1 through any one of the routes under the control of the control mechanism V, the determining unit 12 The control unit 13 determines that the rainwater should be discharged from the tributary stream B1 in the shortest time, and the control unit 13 selects one of the plurality of routes B1a and B1b provided in the tributary stream B1 which take different times for the rainwater to reach the main stream. , the control mechanism V is controlled so that the route B1a takes the shortest time to reach the main stream M1.
Thereby, rainwater can be promptly discharged from the tributary stream B1 to the main stream M1.

(7) The flow path control system 1 according to the seventh aspect is the flow path control system 1 according to (1) to (4), in which the main stream M1 includes the first tributary B1 and the second tributary. In the flow path connected to B2, the amount of water in the main stream (river r1) is less than the first threshold, the amount of water in the first tributary (sewer d1-A) is greater than or equal to the second threshold, and The amount of water in the tributary (sewer waterway d1-B) is less than the second threshold, and the first tributary and the second tributary have different times until rainwater reaches the main stream. When multiple routes are provided (in the case of the sewer d1-A, the detour d1a-A and the direct connection d1b-A; in the case of the sewage d1-B, the detour d1a-B and the direct connection d1b-B) , the determining unit 12 selects, for the first tributary (sewer waterway d1-A), a route (direct connection route d1b-A) that takes the shortest time for rainwater to reach the main stream (river r1); Regarding the second tributary (sewer waterway d1-B), the control unit 13 selects the route (detour route d1a-B) that takes the longest time for rainwater to reach the main stream (river r1), and The control mechanism V of the first tributary stream and the second tributary stream is controlled based on the determination by the determination unit.
As a result, rainwater can be discharged into the main stream (river r1) preferentially from the tributary stream (sewer channel d1-A) where there is a high risk that the water volume will increase beyond the allowable range.

(8) The flow path control system 1 according to the eighth aspect is the flow path control system 1 according to (1) to (7), in which the determining unit 12 determines that the current water volume of the tributary stream B1 is the second Even if it is less than the threshold, if the water volume of the tributary stream B1 is expected to increase and become equal to or higher than the second threshold value, and if the water volume of the main stream M1 is less than the first threshold value, then from the tributary stream B1 The control unit 13 determines to release rainwater to the main stream M1, and controls the control mechanism V in the tributary stream B1, where an increase in water volume is predicted, to cause the rainwater to be released from the tributary stream to the main stream.
When the water level is in mode 2B or 1B, rainwater can be released in advance from tributaries where the water level is expected to rise to the main stream.

(9) The flow path control system 1 according to the ninth aspect is the flow path control system 1 according to (1) to (8), in which the determining unit 12 determines that the current water amount of the main stream M1 is Even if it is less than the threshold, if the water volume of the main stream M1 is predicted to increase and become equal to or higher than the first threshold, it is decided to postpone the release of rainwater from the tributaries B1 and B2 to the main stream M1. However, the control unit 13 stops the discharge from the main stream to the tributary stream by controlling the control mechanism V in the tributary stream B1.
When the water level is in mode 2B and a rise in the water level of the main stream is expected, the supply of rainwater from the tributaries to the main stream can be stopped.

(10) A flow path control system 1 according to a tenth aspect is the flow path control system 1 according to (1) to (9), in which the main stream includes a third tributary B1 and a fourth tributary B2. and a bypass path B12 connecting the third tributary stream B1 and the fourth tributary stream B2, and the control mechanism (valve V11, V12) that adjusts the flow rate of rainwater flowing through the bypass path B12. In the flow path 100 provided in the bypass route B12, when the water volume of the third tributary stream B1 is equal to or higher than the second threshold value and the water volume of the fourth tributary stream B2 is lower than the second threshold value, the determination unit 12 decides to open the control mechanism, and the control section 13 controls the control mechanism (valves V11 and V12) to open.
This allows the amount of water to be adjusted between the tributaries. Furthermore, by discharging rainwater from a tributary to the main stream via another tributary, the timing of rainwater release to the main stream can be changed.

(11) The flow path control method according to the eleventh aspect is configured of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary stream is provided with a control method that controls the flow of rainwater. , a flow path control system for a rainwater flow path, which is provided with a control mechanism for changing the timing of rainwater discharge into the main stream, determines the amount of water in the main stream and the risk that the amount of water in the main stream exceeds a permissible range; A discharge timing from the tributary to the main stream is determined based on a first threshold value of , a water volume of the tributary stream, and a second threshold value for determining the risk that the water volume of the tributary stream exceeds an allowable range. , controlling the control mechanism based on the determination.

(12) The program according to the twelfth aspect is configured of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary stream includes a main stream that flows through the main stream by controlling the flow of rainwater. The computer of the flow path control system for the rainwater flow path, which is provided with a control mechanism for changing the timing of rainwater discharge to determining the timing of release from the tributary to the main stream based on a first threshold, the amount of water in the tributary, and a second threshold for determining the risk that the amount of water in the tributary exceeds an allowable range; Based on the determination, a process for controlling the control mechanism is executed.

DESCRIPTION OF SYMBOLS 1... Flow path control system 10... Control device 11... Data acquisition part 12... Determination part 13... Control part 14... Storage part 900... Computer 901... CPU
902... Main storage device 903... Auxiliary storage device 904... Input/output interface 905... Communication interface

Claims (12)

It is composed of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary has a control mechanism that changes the timing of rainwater release to the main stream by controlling the flow of rainwater. A rainwater flow path control system provided,
a first threshold value for determining the water volume of the main stream, a risk that the water volume of the main stream exceeds a permissible range, a water volume of the tributary stream, and a risk that the water volume of the tributary stream exceeds a permissible range; a second threshold value, and a determining unit that determines the timing of release from the tributary to the main stream,
a control unit that controls the control mechanism based on the determination;
Equipped with
A first path in which the time required for rainwater to reach the main stream is the shortest, and a second path in which the time is longer than the first path are provided in the tributary stream, and under the control of the control mechanism, , if rainwater can be discharged into the main stream through any one of the routes,
The control unit controls the control mechanism so that rainwater passes through the second path when the amount of water in the main stream is less than the first threshold and the amount of water in the tributary is less than the second threshold. ,
When the amount of water in the main stream is less than the first threshold and the amount of water in the tributary exceeds the second threshold, the determining unit determines to release rainwater from the tributary to the main stream in the shortest time, The control unit controls the control mechanism so that rainwater passes through the first path.
Flow path control system. It is composed of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary has a control mechanism that changes the timing of rainwater release to the main stream by controlling the flow of rainwater. A rainwater flow path control system provided,
a first threshold value for determining the water volume of the main stream, a risk that the water volume of the main stream exceeds a permissible range, a water volume of the tributary stream, and a risk that the water volume of the tributary stream exceeds a permissible range; a second threshold value, and a determining unit that determines the timing of release from the tributary to the main stream,
a control unit that controls the control mechanism based on the determination;
Equipped with
In the flow path in which a first tributary and a second tributary are connected to the main stream, the amount of water in the main stream is less than the first threshold, and the amount of water in the first tributary is greater than or equal to the second threshold. , the amount of water in the second tributary is less than the second threshold, and the first tributary and the second tributary have a plurality of routes that take different times for rainwater to reach the main stream. If provided, the determining unit selects a route that takes the shortest time for rainwater to reach the main stream for the first tributary, and selects a route that takes the shortest time for rainwater to reach the main stream for the second tributary. Select the route with the longest arrival time,
The control unit controls the control mechanisms of the first tributary and the second tributary based on the determination by the determination unit.
Flow path control system. It is composed of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary has a control mechanism that changes the timing of rainwater release to the main stream by controlling the flow of rainwater. A rainwater flow path control system provided,
a first threshold value for determining the water volume of the main stream, a risk that the water volume of the main stream exceeds a permissible range, a water volume of the tributary stream, and a risk that the water volume of the tributary stream exceeds a permissible range; a second threshold value, and a determining unit that determines the timing of release from the tributary to the main stream,
a control unit that controls the control mechanism based on the determination;
Equipped with
A first path in which the time required for rainwater to reach the main stream is the shortest, and a second path in which the time is longer than the first path are provided in the tributary stream, and under the control of the control mechanism, , if rainwater can be discharged into the main stream through any one of the routes,
The control unit controls the control mechanism so that rainwater passes through the second path when the amount of water in the main stream is less than the first threshold and the amount of water in the tributary is less than the second threshold. ,
The determining unit is configured to predict that even if the current water volume of the tributary is less than the second threshold, the water volume of the tributary will increase and become equal to or higher than the second threshold, and that the water volume of the main stream is if less than a first threshold, determining the discharge of rainwater from the tributary to the main stream;
The control unit controls the control mechanism so that rainwater passes through the first path in the tributary where an increase in water volume is predicted.
Flow path control system. The determining unit determines to postpone the release of rainwater from the tributary to the main stream when the water volume of the main stream is equal to or greater than the first threshold and the water volume of the tributary is less than the second threshold;
The control unit stops discharge from the tributary to the main stream by controlling the control mechanism in the tributary.
The flow path control system according to any one of claims 1 to 3 . The determining unit determines whether or not the water retarding area is located in the retarding area if the amount of water in the main stream is greater than or equal to the first threshold, and the amount of water in the tributary is greater than or equal to the second threshold, and the tributary stream flows through an area where the retarding area exists. The controller determines to postpone the release of rainwater from the tributary to the main stream flowing through an area where the tributary exists, and the control unit controls the tributary by controlling the control mechanism in the tributary for which it has been decided to postpone the release of rainwater. stopping the discharge from into the main stream;
The flow path control system according to any one of claims 1 to 4 . If the water volume of the main stream is greater than or equal to the first threshold, and the water volume of the tributary stream is greater than or equal to the second threshold, the determination unit determines whether the area will be affected by increased water or internal flooding when the water volume exceeds the allowable range. selecting the tributary with the least impact and deciding to postpone the discharge of rainwater from the selected tributary to the main stream;
The control unit stops the release of rainwater from the tributary to the main stream by controlling the control mechanism in the tributary where it has been decided to postpone the release of rainwater.
The flow path control system according to any one of claims 1 to 5 . The determining unit is configured to transfer the flow from the tributary to the main stream when it is predicted that the water volume of the main stream will increase and become equal to or higher than the first threshold even if the current water volume of the main stream is less than the first threshold. decided to postpone the release of rainwater,
The control unit stops discharge from the main stream to the tributary stream by controlling the control mechanism in the tributary stream.
The flow path control system according to any one of claims 1 to 6 . It is composed of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary has a control mechanism that changes the timing of rainwater release to the main stream by controlling the flow of rainwater. A rainwater flow path control system provided,
a first threshold value for determining the water volume of the main stream, a risk that the water volume of the main stream exceeds a permissible range, a water volume of the tributary stream, and a risk that the water volume of the tributary stream exceeds a permissible range; a second threshold value, and a determining unit that determines the timing of release from the tributary to the main stream,
a control unit that controls the control mechanism based on the determination;
Equipped with
A third tributary stream and a fourth tributary stream are connected to the main stream, and a bypass path connecting the third tributary stream and the fourth tributary stream, and a flow rate of rainwater flowing through the bypass path are adjusted. In the flow path in which the control mechanism is provided in the bypass path, when the water volume of the third tributary is equal to or higher than the second threshold and the water volume of the fourth tributary is lower than the second threshold, the determination the control unit determines to open the control mechanism, and the control unit controls the control mechanism to open.
Flow path control system. It is composed of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary has a control mechanism that changes the timing of rainwater release to the main stream by controlling the flow of rainwater. The rainwater flow path control system that will be installed will
a first threshold value for determining the water volume of the main stream, a risk that the water volume of the main stream exceeds a permissible range, a water volume of the tributary stream, and a risk that the water volume of the tributary stream exceeds a permissible range; determining the timing of release from the tributary to the main stream based on a second threshold value of;
controlling the control mechanism based on the determination ;
has
A first path in which the time required for rainwater to reach the main stream is the shortest, and a second path in which the time is longer than the first path are provided in the tributary stream, and under the control of the control mechanism, , if rainwater can be discharged into the main stream through any one of the routes,
If the amount of water in the main stream is less than the first threshold and the amount of water in the tributary is less than the second threshold, the controlling step controls the control mechanism so that rainwater passes through the second path. death,
When the amount of water in the main stream is less than the first threshold and the amount of water in the tributary is equal to or greater than the second threshold, the determining step determines to release rainwater from the tributary to the main stream in the shortest possible time. ,
The controlling step controls the control mechanism so that rainwater passes through the first path.
Flow path control method. It is composed of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary has a control mechanism that changes the timing of rainwater release to the main stream by controlling the flow of rainwater. The rainwater flow path control system that will be installed will
a first threshold value for determining the water volume of the main stream, a risk that the water volume of the main stream exceeds a permissible range, a water volume of the tributary stream, and a risk that the water volume of the tributary stream exceeds a permissible range; determining the timing of release from the tributary to the main stream based on a second threshold value of;
controlling the control mechanism based on the determination ;
has
In the flow path in which a first tributary and a second tributary are connected to the main stream, the amount of water in the main stream is less than the first threshold, and the amount of water in the first tributary is greater than or equal to the second threshold. , the amount of water in the second tributary is less than the second threshold, and the first tributary and the second tributary have a plurality of routes that take different times for rainwater to reach the main stream. If provided, in the determining step, for the first tributary, select a route that takes the shortest time for rainwater to reach the main stream, and for the second tributary, select a route that takes the rainwater to reach the main stream. Select the route with the longest arrival time,
In the controlling step, the control mechanism of the first tributary and the second tributary is controlled based on the determination in the determining step.
Flow path control method. It is composed of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary has a control mechanism that changes the timing of rainwater release to the main stream by controlling the flow of rainwater. In the computer of the flow path control system of the rainwater flow path that will be installed,
a first threshold value for determining the water volume of the main stream, a risk that the water volume of the main stream exceeds a permissible range, a water volume of the tributary stream, and a risk that the water volume of the tributary stream exceeds a permissible range; determining the timing of release from the tributary to the main stream based on a second threshold value of;
controlling the control mechanism based on the determination ;
has
A first path in which the time required for rainwater to reach the main stream is the shortest, and a second path in which the time is longer than the first path are provided in the tributary stream, and under the control of the control mechanism, , if rainwater can be discharged into the main stream through any one of the routes,
If the amount of water in the main stream is less than the first threshold and the amount of water in the tributary is less than the second threshold, the controlling step controls the control mechanism so that rainwater passes through the second path. death,
When the amount of water in the main stream is less than the first threshold and the amount of water in the tributary is equal to or greater than the second threshold, the determining step determines to release rainwater from the tributary to the main stream in the shortest possible time. ,
A process of controlling the control mechanism so that the rainwater passes through the first path by the controlling step;
A program to run. It is composed of a main stream and a tributary that is connected to the main stream and discharges rainwater into the main stream, and the tributary has a control mechanism that changes the timing of rainwater release to the main stream by controlling the flow of rainwater. In the computer of the flow path control system of the rainwater flow path that will be installed,
a first threshold value for determining the water volume of the main stream, a risk that the water volume of the main stream exceeds a permissible range, a water volume of the tributary stream, and a risk that the water volume of the tributary stream exceeds a permissible range; determining the timing of release from the tributary to the main stream based on a second threshold value of;
controlling the control mechanism based on the determination ;
has
In the flow path in which a first tributary and a second tributary are connected to the main stream, the amount of water in the main stream is less than the first threshold, and the amount of water in the first tributary is greater than or equal to the second threshold. , the amount of water in the second tributary is less than the second threshold, and the first tributary and the second tributary have a plurality of routes that take different times for rainwater to reach the main stream. If provided, in the determining step, for the first tributary, select a route that takes the shortest time for rainwater to reach the main stream, and for the second tributary, select a route that takes the rainwater to reach the main stream. Select the route with the longest arrival time,
In the controlling step, the control mechanism of the first tributary and the second tributary is controlled based on the determination in the determining step;
A program to run.

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