Field water management system, field water management method, and program

Abstract

To appropriately control operations of a water supply device and a drainage device for storing water in a field such as a paddy field in accordance with weather conditions.SOLUTION: A field water management system includes: a water tap device including a water supply device provided to supply water to a field and a drainage device provided to discharge water from the field; an irrigation channel management server that manages irrigation water connected to the field; a field management server that performs farm-operation-responsive control including at least one of control of opening and closing of the water supply device and the drainage device in accordance with a farming schedule and control of opening and closing of the water supply device and the drainage device in response to remote control from a field main terminal; and a water intake gate connected to a river. The irrigation channel management server includes a water supply and drainage control unit that controls water from the river to flow into the field, and is configured to be capable of executing control of the water tap device for rainwater storage in preference to control of the water tap device for farm-operation-responsive control by the field management server.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a field water management system, a field water management method, and a program. [Background technology]

[0002] A rice paddy dam system is known in which a drainage volume adjustment unit is provided for drainage pipes installed in rice paddies, and the amount of water discharged from the rice paddies into public drainage channels is reduced by operating the drainage volume adjustment unit when there is heavy rainfall (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6496230 Summary of the Invention [Problem to be solved by the invention]

[0004] The rice paddy dam described in Patent Document 1 adjusts the discharge volume manually by operating a handle on a discharge volume adjustment unit. From the viewpoints of work efficiency and safety, it is preferable to appropriately control the operation of the water supply device and the drainage device in order to store water in a field such as a rice paddy depending on weather conditions such as heavy rain.

[0005] The present invention was made in consideration of these circumstances, and aims to provide a method for appropriately controlling the operation of water supply devices and drainage devices for storing water in fields such as rice paddies, depending on weather conditions. [Means for solving the problem]

[0006] One aspect of the present invention for solving the above-mentioned problems is a water faucet device including a water supply device provided to supply water to a field and a drainage device provided to drain water from the field; an irrigation canal management server that manages irrigation water connected to the farm field; a farm management server that performs farm management control, including at least one of controlling the opening and closing of the water supply device and the drainage device according to a farming schedule and controlling the opening and closing of the water supply device and the drainage device in response to remote control from a farm owner's terminal; a water inlet gate connected to a river; the irrigation canal management server is equipped with a water supply and drainage control unit that controls water flowing from a river into a farm field, and is capable of controlling the faucet devices for rainwater storage in priority to the control of the faucet devices for farming by the farm field management server; When the water supply and drainage control unit determines that rainwater storage is necessary in response to the occurrence of heavy rain upstream or downstream of a watershed of a river that is a source of water supply to the field and that corresponds to the area in which the field is located, it sends a water intake request to the field management server in the corresponding area to execute control of the water faucet device for rainwater storage in priority to control of the water faucet device for farming by the field management server; In response to receiving the water intake request, the farm management server controls the water inlet gate to be in an open state, thereby performing heavy rain response control to control the water flow from the river into the farm field. This is a field water management system characterized by the above.

[0007] One aspect of the present invention is a water faucet device including a water supply device provided to supply water to a field and a drainage device provided to drain water from the field; an irrigation canal management server that manages irrigation water connected to the farm field; a farm management server that performs farm management control, including at least one of controlling the opening and closing of the water supply device and the drainage device according to a farming schedule and controlling the opening and closing of the water supply device and the drainage device in response to remote control from a farm owner's terminal; A field water management method performed by a field water management system comprising: the irrigation canal management server is equipped with a water supply and drainage control unit that controls water flowing from a river into a farm field, and is capable of controlling the faucet devices for rainwater storage in priority to the control of the faucet devices for farming by the farm field management server; When the water supply and drainage control unit determines that rainwater storage is necessary in response to the occurrence of heavy rain upstream or downstream of a watershed of a river that is a source of water supply to the field and that corresponds to the area in which the field is located, it sends a water intake request to the field management server in the corresponding area to execute control of the water faucet device for rainwater storage in priority to control of the water faucet device for farming by the field management server; In response to receiving the water intake request, the farm management server controls the water inlet gate to be in an open state, thereby performing heavy rain response control to control the water flow from the river into the farm field. This is a field water management method characterized by the above.

[0008] One aspect of the present invention is a water faucet device including a water supply device provided to supply water to a field and a drainage device provided to drain water from the field; an irrigation canal management server that manages irrigation water connected to the farm field; a farm management server that performs farm management control, including at least one of controlling the opening and closing of the water supply device and the drainage device according to a farming schedule and controlling the opening and closing of the water supply device and the drainage device in response to remote control from a farm owner's terminal; a water inlet gate connected to the river; the irrigation canal management server is equipped with a water supply and drainage control unit that controls water flowing from a river into a farm field, and is capable of controlling the faucet devices for rainwater storage in priority to the control of the faucet devices for farming by the farm field management server; The farm field management server controls the water inlet gate to be in an open state in response to a water intake request transmitted from the irrigation canal management server, thereby executing heavy rain response control to control water from a river to flow into the farm field. When it is determined that rainwater storage is necessary in response to the occurrence of heavy rain upstream or downstream of the basin of a river that is a source of water supply to a farm field and that corresponds to the area in which the farm field is located, a water intake request is sent to the farm field management server in the corresponding area to execute control of the water faucet device for rainwater storage, prior to control of the water faucet device for farming by the farm field management server. It is a program that executes this. [Effects of the Invention]

[0009] According to the present invention, it is possible to obtain an effect that the operation of a water supply device and a drainage device for storing water in a field such as a rice paddy can be appropriately controlled in accordance with weather conditions. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing an example of the overall configuration of an irrigation water management system according to a first embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of the functional configuration of a farm land management server according to the first embodiment. [Figure 3] FIG. 2 is a diagram showing an example of farm field management information according to the first embodiment. [Figure 4] FIG. 2 is a diagram illustrating an example of the functional configuration of an irrigation canal management server according to the first embodiment. [Figure 5] 3A to 3C are diagrams showing examples of irrigation canal information, tributary supply canal information, tributary drainage canal information, and water level sensor information according to the first embodiment. [Figure 6] 10 is a flowchart showing an example of a processing procedure executed by the irrigation canal management server according to the first embodiment in relation to rainwater storage. [Figure 7] 10 is a flowchart showing an example of a processing procedure executed by an irrigation canal management server according to the second embodiment in relation to rainwater storage. [Figure 8] FIG. 1 is a diagram showing an example of the overall configuration of an irrigation water management system according to a first modified example of the present embodiment. [Figure 9] FIG. 10 is a diagram showing an example of the overall configuration of an irrigation water management system according to a second modified example of the present embodiment. [Figure 10]FIG. 10 is a diagram showing an example of a farm field according to a third modified example of the present embodiment. [Figure 11] FIG. 10 is a diagram showing an example of a farm field according to a fourth modified example of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an irrigation water management system according to an embodiment of the present invention will be described with reference to the drawings. First Embodiment [Example of overall configuration of water management system] Fig. 1 shows an example of the overall configuration of an irrigation water management system in this embodiment. The irrigation water management system in this embodiment performs "field management (agricultural management)" and "irrigation canal management" as "irrigation water management." Field management is management of a field carried out by a field owner (farmer) for farming purposes, and includes management of the supply and drainage of irrigation water in a field suitable for farming. Irrigation canal management is a higher-level management than farm field management, and involves managing the flow of irrigation water in irrigation canals provided for groups of farm fields. Irrigation canal management is performed by an irrigation canal manager who operates the irrigation canal management server 300. In correspondence with the figure, the irrigation canals subject to canal management include the main supply canal MSP, the tributary supply canals BSP (BSP-1, BSP-2), the tributary drainage canals BDR (BDR-11, BDR-12, BDR-21, BDR-22), and the main drainage canal MDR.

[0012] The water supply and drainage systems of the fields managed by the irrigation management system will be explained with reference to the figure. The figure shows an example in which the irrigation management system manages a first group of fields consisting of fields FM-11 to FM-16 and a second group of fields consisting of fields FM-21 to FM-26. The fields FM-11 to FM-16 and FM-21 to FM-26 in the figure are, for example, rice paddies, and irrigation and drainage (water supply and drainage) are carried out to maintain appropriate water levels depending on the rice cultivation season. In the following explanation, fields FM-11 to FM-16 and fields FM-21 to FM-26 will be referred to as field FM unless a distinction is made between them. Note that the number of fields FM and field groups that are managed by the irrigation management system of this embodiment is not particularly limited.

[0013] Field FM is supplied with water drawn from the river RV as follows: For river RVs, a water entry gate GTS is provided. The water entry gate GTS includes, for example, a water gate and a pump. Each water inlet gate GTS is assigned a water inlet gate ID (identifier). The irrigation canal management server 300 controls the opening and closing of the water gates and the operation of the pumps at the water inlet gate GTS via the network NW, thereby adjusting the amount of water flowing into the main water supply channel MSP.

[0014] The water flowing through the main water supply channel MSP is diverted into the tributary water supply channels BSP (BSP-1, BSP-2). The tributary supply channel BSP-1 is arranged to penetrate the first group of fields. Each field FM in the first group of fields is provided with a predetermined number of water hydrants 10 (an example of a water supply device) corresponding to the tributary supply channel BSP-1. The water hydrants 10 adjust the amount of water supplied from the water inlet and discharged from the discharge outlet depending on the opening degree of a valve (a stopper) provided in the flow path between the water inlet and the discharge outlet. The water taps 10 installed in the fields FM of the first group of fields supply water to the corresponding fields FM by discharging irrigation water supplied from the tributary water supply channel BSP-1 into the fields FM. The water taps 10 installed in the fields FM of the second group of fields discharge irrigation water supplied from the tributary water supply channel BSP-2, thereby supplying irrigation water to the corresponding fields FM.

[0015] As described above, each hydrant 10 installed in the field FM is assigned a hydrant ID. The hydrants 10 adjust the amount of water supplied to the field FM by changing their opening degrees in accordance with control by the farm land management server 100 via the network NW.

[0016] Furthermore, a tributary drainage channel BDR-11 is located on the opposite bank of the tributary water supply channel BSP-1 of the fields FM-11 to FM-13 in the first group of fields. A predetermined number of drain plugs 20 (an example of a drainage device) are provided in each of the fields FM in the first group of fields in correspondence with the tributary drainage channel BDR-11. The drain plugs 20 adjust the amount of irrigation water supplied from the water inlet and discharged from the discharge outlet according to the degree of opening of a plug (valve) provided in the flow path between the water inlet and the discharge outlet. The drain plug 20 discharges the irrigation water stored in the corresponding farm field FM into the tributary drainage channel BDR-11. Additionally, in the first group of fields, tributary drainage channel BDR-12 is located on the opposite bank of tributary water supply channel BSP-1 for fields FM-14 to FM-16. A predetermined number of drainage valves 20 are provided in each of the fields FM in the second group of fields, corresponding to the tributary drainage channel BDR-12. The drainage valves 20 discharge irrigation water stored in the corresponding field FM into the tributary drainage channel BDR-12.

[0017] Furthermore, in the second group of fields, a tributary drainage channel BDR-21 is placed on the opposite bank of the tributary water supply channel BSP-2 for fields FM-21 to FM-23. A predetermined number of drainage valves 20 are provided in each of the fields FM in the second group of fields, corresponding to the tributary drainage channel BDR-21. The drainage valves 20 discharge irrigation water stored in the corresponding field FM into the tributary drainage channel BDR-21. Furthermore, in the first group of fields, tributary drainage channel BDR-22 is located on the opposite bank of tributary supply channel BSP-2 for fields FM-24 to FM-26. A predetermined number of drainage valves 20 are provided in each of the fields FM in the second group of fields, corresponding to the tributary drainage channel BDR-22. The drainage valves 20 discharge irrigation water stored in the corresponding field FM into the tributary drainage channel BDR-22.

[0018] As described above, the drain plug 20 installed in the field FM is assigned a drain plug ID. The drain plug 20 adjusts the amount of irrigation water discharged from the field FM by changing the opening degree in accordance with the control of the farm land management server 100 via the network NW.

[0019] The irrigation water discharged into the tributary drainage channels BDR-11, BDR-12, BDR-21, and BDR-22 flows into the main drainage channel MDR. The irrigation water that flows into the main drainage channel MDR is discharged into the river RV from the outflow gate GTD. In this example, the outflow gate GTD is located downstream of the inflow gate GTS. The flood gate GTD includes, for example, a water gate and a pump. The water gate GTD is assigned a water gate ID. The irrigation channel management server 300 controls the opening and closing of the water gate and the operation of the pump at the flood gate GTD via the network NW, thereby adjusting the amount of irrigation water discharged into the river RV.

[0020] In addition, a main water supply sensor 50A is provided in the main water supply channel MSP upstream of the tributary water supply channels BSP-1 and BSP-2. The main water supply sensor 50A detects the flow rate of irrigation water in the main water supply channel MSP. A sensor ID is assigned to the main water supply sensor 50A. The main water supply sensor 50A transmits the detected flow rate to the irrigation channel management server 300 via the network NW.

[0021] In addition, a tributary water supply sensor 50B is provided in each tributary water supply channel BSP (BSP-1, BSP-2). The tributary water supply sensor 50B detects the flow rate of irrigation water in the corresponding tributary water supply channel BSP. A sensor ID is assigned to the tributary water supply sensor 50B. The tributary water supply sensor 50B transmits the detected flow rate to the irrigation channel management server 300 via the network NW.

[0022] In addition, a tributary drainage sensor 60B is provided in each tributary drainage channel BDR (BDR-11, BDR-12, BDR-21, BDR-22). The tributary drainage sensor 60B detects the flow rate of irrigation water in the corresponding tributary drainage channel BDR. A sensor ID is assigned to the tributary drainage sensor 60B. The tributary drainage sensor 60B transmits the detected flow rate to the irrigation channel management server 300 via the network NW.

[0023] In addition, a mainstream drainage sensor 60A is provided in the mainstream drainage channel MDR downstream of the tributary drainage channel BDR. The mainstream drainage sensor 60A detects the flow rate of irrigation water in the mainstream drainage channel MDR. A sensor ID is assigned to the mainstream drainage sensor 60A. The mainstream drainage sensor 60A transmits the detected flow rate to the irrigation channel management server 300 via the network NW.

[0024] Additionally, each of the fields FM is provided with a water level sensor 30 for farming purposes. The water level sensor 30 detects the water level of the corresponding field FM. A sensor ID is assigned to the water level sensor 30. The water level sensor 30 transmits the detected water level to the farm field management server 100 via the network NW. The water level sensor 30 may also transmit the detected water level to the farm field management server 100 using a communication function provided in the water supply tap 10 or the drain plug 20. In this case, the water level sensor 30 transmits the detected water level to the water supply tap 10 or the drain plug 20 via wireless communication or wired communication.

[0025] Each of the fields FM is also provided with a water level sensor 40 for irrigation canal management. The water level sensor 40 detects the water level of the corresponding field FM. A sensor ID is assigned to the water level sensor 40. The water level sensor 40 transmits the detected water level to the irrigation canal management server 300 via the network NW.

[0026] The irrigation canal management server 300 may acquire the water level detected by the farming water level sensor 30 via the farmland management server 100. In this case, the irrigation canal management water level sensor 40 may be omitted.

[0027] The farmland management server 100 is a server operated by a farm manager who has signed a contract for farm management services with the owner of the farm FM. The farmland management server 100 is capable of communicating with a farm owner's terminal 200, water faucet devices (water supply faucets 10, drain plugs 20), farm water level sensors 30, etc. via a network NW. The farm land management server 100 controls the opening and closing of the water faucet devices in accordance with the farming schedule set by the farm owner, thereby maintaining the water level in the farm field FM in accordance with the farming schedule. The farming schedule can be set, for example, by the farm owner accessing the farm management server 100 using the farm owner terminal 200 and performing operations on the farming schedule setting screen that is displayed. The farm owner can also remotely control the opening of the faucet device by, for example, specifying the faucet device and specifying the opening degree by operating the farm owner terminal 200. The farm owner can also adjust the opening degree of the faucet device by going to the field FM and operating the faucet device itself.

[0028] The farm owner terminal 200 may be, for example, a personal computer, a tablet terminal, a smartphone, etc. These information processing devices serving as the farm owner terminal 200 can access the farm management server 100 via a web browser or a farm management application.

[0029] The irrigation canal management server 300 is a server operated by the irrigation canal manager, and manages the supply and drainage of irrigation water to and from the field FM at a higher level than the field management server 100. The irrigation canal management server 300 is communicably connected via a network NW to the water inlet gate GTS, the water outlet gate GTD, sensors installed in the irrigation canal (main water supply sensor 50A, tributary water supply sensor 50B, tributary drainage sensor 60B, main drainage sensor 60A), and the water level sensor 40 of each field FM.

[0030] Under normal circumstances, the irrigation canal management server 300 adjusts the amount of water supplied to and drained from the groups of fields (the first and second groups of fields) according to, for example, predetermined rules. When adjusting the amount of water supplied to and drained from the groups of fields, the irrigation canal management server 300 controls the opening of the water gates at the water inlet gate GTS and the water outlet gate GTD as appropriate.

[0031] The irrigation canal management server 300 acquires weather information via the network NW, and determines whether or not it is necessary to temporarily store rainwater in the field FM (rainwater storage) based on the acquired weather information. Specifically, when the irrigation canal management server 300 predicts, based on weather information, for example, that there will be a predetermined amount of rainfall (heavy rain) or more after a predetermined time, it determines that it is necessary to store rainwater in the field FM without discharging it (rainwater storage) in accordance with the time period during which heavy rain will occur. If it is determined that rainwater storage is necessary, the irrigation canal management server 300 controls the faucet devices for rainwater storage, prioritizing the control of faucet devices for farming by the farmland management server 100. A specific example of the control of faucet devices for rainwater storage performed by the irrigation canal management server 300 will be described later. In addition, the irrigation manager may decide whether or not it is necessary to store rainwater based on various information.In this case, the irrigation canal management server 300 may integrate information such as weather information, the water inlet gate GTS, the water outlet gate GTD, sensors installed in the irrigation canal, and the water level sensors 40 in each field FM, and present it to the irrigation manager by display, etc., to prompt him or her to decide whether or not it is necessary to store rainwater.

[0032] [Example of a farm management server configuration] An example of the functional configuration of the farm land management server 100 will be described with reference to Fig. 2. The functions of the farm land management server 100 in Fig. 2 are realized by executing a program by a CPU (Central Processing Unit) provided in the farm land management server 100. The farm land management server 100 includes a communication unit 101, a control unit 102, and a storage unit 103. The communication unit 101 performs communication via a network.

[0033] The control unit 102 executes control in the farm management server 100. The control unit 102 controls the operation of the water faucet devices (water supply faucets 10, drain plugs 20) in accordance with farming operations. For example, the control unit 102 can control the opening and closing of the water faucet devices via the network NW so that the water level is maintained at the time and time period specified in the farming schedule set by the farm owner. The control unit 102 can also control operations such as opening and closing of the water faucet devices in accordance with commands sent from the farm owner's terminal 200 by the farm owner's operation of the farm owner's terminal 200. Furthermore, the control unit 102 can issue various notifications to the field owner terminal 200.

[0034] The storage unit 103 stores various types of information related to the farm land management server 100. The storage unit 103 in the figure includes a farm land management information storage unit 131. The field management information storage unit 131 stores field management information. The field management information is management information for each field FM.

[0035] 3 shows an example of the field management information stored in the field management information storage unit 131. In the figure, one row (one record) is the field management information corresponding to one field. The field management information corresponding to one field includes the fields of field ID, water supply valve ID, drain valve ID, farming water level sensor ID, field owner information, field owner terminal information, and farming schedule. The field ID field stores the field ID assigned to the corresponding field FM. The hydrant ID field stores the hydrant ID for each hydrant 10 provided in the corresponding field FM. The drain plug ID field stores the water supply plug ID for each drain plug 20 provided in the corresponding farm field FM. The farming water level sensor ID stores the sensor ID of the farming water level sensor 30 installed in the corresponding farm field FM. The field for field owner information stores information about the corresponding field owner (field owner information). The field owner information includes the field owner ID assigned to the corresponding field owner. The field owner terminal information area stores information (field owner terminal information) about the field owner terminal 200 owned by the corresponding field owner. The field owner terminal information includes the field owner terminal ID assigned to the corresponding field owner terminal 200. The farming schedule area stores the farming schedule set for the corresponding field FM. The farming schedule can be set by the farm owner operating the farm owner terminal 200. In the farming schedule, the water levels required for farming in the corresponding field FM are set in units of months, weeks, dates, etc.

[0036] [Example of irrigation canal management server configuration] An example of the functional configuration of the irrigation canal management server 300 will be described with reference to Fig. 4. The functions of the irrigation canal management server 300 in the figure are realized by executing a program by a CPU provided in the irrigation canal management server 300. The irrigation canal management server 300 includes a communication unit 301, a control unit 302, and a storage unit 303. A communication unit 301 performs communication via a network.

[0037] The control unit 302 executes control in the irrigation canal management server 300. The control unit 302 includes a water supply and drainage control unit 322. The water supply and drainage control unit 322 adjusts the flow of water in the irrigation channel. That is, the water supply and drainage control unit 322 adjusts the amount of water flowing into (supplying) the main water supply channel MSP from the river RV and the amount of water flowing out (draining) from the main drainage channel MDR to the river RV by controlling the opening of the water inlet gate GTS and the water outlet gate GTD. Furthermore, the water supply and drainage control unit 322 determines whether rainwater storage is necessary based on weather information. If the water supply and drainage control unit 322 determines that rainwater storage is necessary, it executes control of the faucet devices for rainwater storage, prior to the control of the faucet devices for farming by the farmland management server 100.

[0038] The storage unit 303 stores various types of information corresponding to the irrigation canal management server 300. The storage unit 303 includes an irrigation canal information storage unit 331, a tributary supply canal information storage unit 332, a tributary drainage canal information storage unit 333, and a water level sensor information storage unit 334.

[0039] The irrigation canal information storage unit 331 stores irrigation canal information. The irrigation canal information is information for managing irrigation canals by channel (main supply channel MSP, main drainage channel MDR, tributary supply channel BSP, tributary drainage channel BDR).

[0040] The tributary supply channel information storage unit 332 stores tributary supply channel information. The tributary supply channel information is information for managing the faucets 10 and tributary supply sensors 50B provided for each tributary supply channel BSP.

[0041] The tributary drainage channel information storage unit 333 stores tributary drainage channel information. The tributary drainage channel information is information for managing the drain plugs 20 and tributary drainage sensors 60B provided corresponding to each tributary drainage channel BDR.

[0042] The water level sensor information storage unit 334 stores water level sensor information. The water level sensor information is information for managing the water level sensors 40 for managing irrigation channels that are installed in the farm fields FM in the corresponding regions.

[0043] 5(A) shows an example of irrigation canal information stored in the irrigation canal information storage unit 331. The irrigation canal information in this figure corresponds to the irrigation canals arranged in association with the area including the first group of fields and the second group of fields in FIG. The irrigation canal information in the figure includes areas for river ID, area information, main water supply canal ID, main water supply sensor ID, main drainage canal ID, main drainage sensor ID, tributary water supply canal ID, and tributary drainage canal ID. The River ID field stores the river ID assigned to the river RV that is the source and destination of the water supply. The area information field stores information about the corresponding area (area information). The area information includes information indicating where the corresponding area is located (e.g., latitude, longitude, address, etc.). The field for the main water supply channel ID stores the main water supply channel ID assigned to the main water supply channel MSP in the corresponding area. The field for the mainstream water supply sensor ID stores the mainstream water supply sensor ID indicating the mainstream water supply sensor 50A arranged in the mainstream water supply channel MSP. The field for the main drainage channel ID stores the main drainage channel ID assigned to the main drainage channel MDR in the corresponding area. The area for the mainstream drainage sensor ID stores the mainstream drainage sensor ID indicating the mainstream drainage sensor 60A arranged in the mainstream drainage channel MDR. The tributary supply channel ID field stores the tributary supply channel ID assigned to each tributary supply channel BSP provided in correspondence with the corresponding main supply channel MSP and main drainage channel MDR. The tributary drainage channel ID field stores the tributary drainage channel ID assigned to each tributary drainage channel BDR provided in correspondence with the corresponding main supply channel MSP and main drainage channel MDR.

[0044] 5(B) is an example of tributary supply canal information stored in the tributary supply canal information storage unit 332. One record in the figure is tributary supply canal information corresponding to one tributary supply canal BSP. The water supply canal information corresponding to one tributary supply canal BSP includes fields for the tributary supply canal ID, field ID, water faucet ID, and tributary water supply sensor ID. The tributary supply channel ID field stores the tributary supply channel ID assigned to the corresponding tributary supply channel BSP. The field ID field stores the field ID for each field FM to which water is supplied by the corresponding tributary water supply canal BSP. The hydrant ID field stores the hydrant ID for each hydrant 10 that is installed to supply water from the corresponding tributary water supply channel BSP to the field FM. The tributary water supply sensor ID field stores the sensor ID of the tributary water supply sensor 50B provided in the corresponding tributary water supply channel BSP.

[0045] 5(C) is an example of tributary drainage channel information stored in the tributary drainage channel information storage unit 333. One record in the figure is tributary drainage channel information corresponding to one tributary drainage channel BDR. The drainage channel information corresponding to one tributary drainage channel BDR includes fields for the tributary drainage channel ID, field ID, drain plug ID, and tributary drainage sensor ID. The tributary drainage channel ID field stores the tributary drainage channel ID assigned to the corresponding tributary drainage channel BDR. The field ID field stores the field ID for each field FM that is drained by the corresponding tributary drainage channel BDR. The drain plug ID field stores the drain plug ID for each drain plug 20 provided to drain water from the corresponding tributary drainage channel BDR to the field FM. The tributary drainage sensor ID field stores the sensor ID of the tributary drainage sensor 60B provided in the corresponding tributary drainage channel BDR.

[0046] Figure 5(D) shows an example of water level sensor information stored in the water level sensor information storage unit 334. The water level sensor information in this figure has a structure in which irrigation canal management water level sensor IDs are stored in association with each field ID. In other words, the water level sensor information is information indicating the water level sensor 40 for irrigation canal management that is provided for each field FM.

[0047] [About rainwater harvesting] In the irrigation management system of this embodiment, the irrigation canal management server 300 in normal times controls the opening degrees of the water gates at the water inlet gate GTS and the water outlet gate GTD in accordance with a water allocation schedule determined for normal times, for example. As a result, the irrigation canal management server 300 supplies water to the field FM or stops the supply of water in accordance with the water allocation schedule.

[0048] In addition, under normal circumstances, the field management server 100 controls the opening degree of the water faucet device according to the set farming schedule and remote operation from the field owner terminal 200, thereby ensuring that water is supplied and drained to the field FM for farming purposes. Furthermore, during normal times, the irrigation canal management server 300 prioritizes control of the faucet devices for farming by the farmland management server 100. In this case, the irrigation canal management server 300 is configured not to particularly control the faucet devices.

[0049] Here, when heavy rain falls in the area corresponding to the location of the field FM, the water level of the river RV rises. The area may be either a certain range of area including the field FM or a certain range of area upstream of the river RV to which the field FM corresponds. When heavy rain occurs in the area and the rain that fell on the field FM is being drained by the drain plug 20, the rainwater drained from the field FM flows from the tributary drainage channel BDR through the main drainage channel MDR and into the river RV from the outflow gate GTD. When rainwater flows from the field FM into the river RV in this way, the water level of the river RV rises further, and there is a possibility that the river RV may overflow.

[0050] When the floodgate of the outflow gate GTD is closed, rainwater from the field FM does not flow into the river RV. However, in this case, the rainwater discharged from the field FM by the drain plug 20 accumulates in the drainage channels (tributary drainage channel BDR, main drainage channel MDR) and overflows, which is a problem.

[0051] Therefore, the irrigation management system of this embodiment stores rainwater in response to heavy rain in the relevant area. In other words, in response to heavy rain in the relevant area, the irrigation management system stores rainwater that has fallen in the field FM in the field FM without discharging it. By storing rainwater in the field FM in this way in response to heavy rain, water level information for the river RV is suppressed. It is also possible to prevent rainwater from overflowing from the drainage channel. In the irrigation management system of this embodiment, rainwater storage is performed under the authority of the irrigation canal manager. When rainwater storage is performed, field management is restricted. Therefore, the irrigation canal management server 300 takes the lead in controlling rainwater storage, and the field management server 100 functions to relay the control of the faucet devices by the irrigation canal management server 300.

[0052] [Example of processing procedure] An example of a processing procedure executed by the irrigation canal management server 300 in relation to rainwater storage will be described with reference to the flowchart of FIG.

[0053] Step S101: In the irrigation canal management server 300, the storage necessity determination unit 321 acquires meteorological information for the relevant area corresponding to the group of fields at a predetermined timing. Note that it is not necessary to acquire meteorological information; instead, the water level of the field FM may be acquired from the field management server 100 to grasp the actual water level of the field. The storage necessity determination unit 321 may be configured to acquire weather information for the area corresponding to the group of fields, triggered, for example, by the passage of a certain period of time, an instruction from the irrigation canal manager, etc. The storage necessity determination unit 321 may acquire weather information by accessing, via the network NW, a weather information server that provides weather information.

[0054] Step S102: The storage necessity determination unit 321 determines whether or not heavy rain is predicted to occur in the relevant area within a predetermined time, based on the weather information acquired in step S101. The determination in step S102 of whether or not heavy rain is predicted to occur corresponds to a determination of whether or not it has become necessary to store water (rainwater storage) in the field FM in response to the occurrence of heavy rain. If no heavy rain is predicted to occur, the process in this figure may be terminated. In addition, the storage necessity determination unit 321 may determine that rainwater storage is necessary, for example, when an irrigation canal manager determines that rainwater storage is necessary and performs an operation to instruct the activation of forced control of faucet devices, etc. for rainwater storage on an input interface connected to the irrigation canal management server 300 or on a terminal connected to the irrigation canal management server 300 so as to be able to communicate with the irrigation canal management server 300.

[0055] Step S103: If heavy rain is predicted to occur within a predetermined time in step S102, the water supply and drainage control unit 322 sends a field management restriction request to the field management server 100 that manages the field FM (group of fields) in the relevant area. The field management server 100 that receives the field management restriction request restricts field management that corresponds to normal times. Specifically, the farm land management server 100 forcibly stops the control of the faucet devices according to the farming schedule under normal circumstances and the control of the faucet devices in response to remote control from the farm land owner terminal 200. Alternatively, rather than stopping the control of the faucet devices in response to remote control from the farm land owner terminal 200, priority may be given to the control of the faucet devices for rainwater storage by the irrigation canal management server 300 in S104 and S015, which will be described later. Furthermore, as a forced stop of farm land management, the farm land management server 100 may control the faucet devices so that the opening degree of the faucet devices themselves cannot be adjusted manually.

[0056] By executing step S103, the farmland management server 100 will no longer control the faucet devices for farming, and the irrigation canal management server 300 will be able to control the faucet devices for rainwater storage. From then on, the farmland management server 100 will relay communications for the irrigation canal management server 300 to control the faucet devices for rainwater storage.

[0057] Step S104: As a procedure for storing rainwater, the water supply and drainage control unit 322 first sends a water supply stop request to the farmland management server 100. The water supply stop request is a command requesting that all water taps 10 in the relevant area be closed to stop the water supply. In response to the transmission of the water supply stop request, the farm land management server 100 controls all of the water taps 10 in the relevant area to be forcibly closed, thereby stopping the water supply to the farm land FM. In addition, in addition to sending a close request in step S104, the water supply and drainage control unit 322 may also control the water gate of the water inlet gate GTS to close, thereby stopping the inflow of water from the river RV into the water supply channel.

[0058] Step S105: In addition to sending the water supply stop request in step S104, the water supply and drainage control unit 322 also sends a drainage request to the farmland management server 100. The drainage request is a command requesting that all drain plugs 20 in the relevant area be forcibly opened to drain water. In response to the sending of the drainage request, the farmland management server 100 controls all drain plugs 20 in the relevant area to be forcibly opened to the full.

[0059] As a result of the control of steps S104 and S105, water is drained without being supplied to the field FM in the relevant region, and the water level therefore drops. In other words, the water supply and drainage control unit 322 forcibly lowers the water level in the field FM in the relevant region before heavy rain occurs through the control of steps S104 and S105. This makes it possible to increase the amount of rainwater that can be stored in the field FM when heavy rain occurs. In addition, since stopping a water supply valve 10 or a drain valve 20 that is not in use may result in an unexpected accident, water supply valves 10 and drain valves 20 that are to be forcibly controlled may be excluded from the forcible control if they do not have the most recent farming schedule registered, if the current location information obtained is not the location of a pre-registered specified field, or if they have stopped abnormally. For example, water supply valves 10 and drain valves 20 that are not in use may have been moved to a certain location and may be outside the communication range of a gateway installed in the field so as to be on the communication path with the irrigation canal management server 300. Water supply valves 10 and drain valves 20 that are outside the communication range of the gateway in this way may be excluded from compulsory control.

[0060] Step S106: After the processing of steps S104 and S105, the water supply and drainage control unit 322 acquires the water level detected by the water level sensor 40 installed in the field FM in the relevant region by communicating with the water level sensor 40. The water supply and drainage control unit 322 executes control (drainage stop control) to stop drainage from the drain plug 20 of the field FM where the acquired water level has reached a predetermined lower limit water level. Step S107: After performing drainage stop control for one field FM in the relevant area in step S106, the water supply and drainage control unit 322 determines whether drainage stop control for all fields FM in the relevant area has been completed at this stage. If it is determined that the drainage stop control has not been completed for all of the fields FM, the process returns to step S106.

[0061] When the processing up to step S107 is completed, all fields FM in the area are at the lower limit water level and all water supply valves 10 and drain valves 20 are closed. As a result, no irrigation water flows into the fields FM from the water supply channels, and the fields FM are able to store an amount of rainwater appropriate to the size of the fields FM. It should be noted that there may be cases where heavy rain occurs before drainage stop control is completed for all fields FM. In this case, when the water supply and drainage control unit 322 determines that heavy rain has occurred, the water supply and drainage control unit 322 may forcibly control the drain plugs 20 to close even for fields FM for which drainage stop control has not yet been completed.

[0062] In addition, instead of processing steps S106 and S107, the water supply and drainage control unit 322 may wait until a predetermined time has elapsed since sending a drainage request in step S105 and starting drainage in each field FM, and control the drainage plugs 20 of each field FM to be closed once the predetermined time has elapsed.

[0063] Step S108: After the rainwater has been made storable as described above, if heavy rain occurs at a certain time, the rainwater will be stored in the field FM. Therefore, the storage necessity determination unit 321 acquires meteorological information at regular intervals, for example, after the processing of steps S106 and S107, and determines the weather at that time based on the acquired meteorological information. Then, after determining that heavy rain has occurred, the storage necessity determination unit 321 determines whether the heavy rain that has occurred has subsided. The storage necessity determination unit 321 may determine whether the heavy rain has subsided, for example, by determining whether the amount of rainfall based on the meteorological information has remained below a certain level for a certain period of time. Determining whether the heavy rain has subsided corresponds to determining whether the rainwater storage that has been carried out up until now is no longer necessary.

[0064] Step S109: When the amount of rainwater stored in the field FM becomes excessive, the rainwater may flow out of the field FM over the ridges. For example, in consideration of the conservation of the ridges, it is preferable to avoid a situation in which rainwater flows out over the ridges. Therefore, in a state in which it is determined in step S108 that the heavy rain has not subsided, the water supply and drainage control unit 322 executes water level exceedance prevention control. Water level exceedance prevention control is to control the water level in the field FM so that it does not exceed an upper limit water level (storage-compatible upper limit water level) set in response to heavy rain. The storage-compatible upper limit water level may be set higher than the upper limit water level determined in response to farming (farming-compatible upper limit water level) and lower than the height of the ridges. The storage-compatible upper limit water level may be set by the farm owner or farm manager.

[0065] As part of the water level exceedance prevention control, the water supply and drainage control unit 322 monitors the water level detected by the water level sensor 40 for each field FM and determines whether any field FM has a water level above a threshold value set in accordance with the storage upper limit water level. If it determines that any field FM has a water level above the threshold value, the water supply and drainage control unit 322 executes control to open the drain valve 20 in the field FM where the water level is above the threshold value. That is, in this case, the water supply and drainage control unit 322 sends a drainage request to the field management server 100 requesting that the drain valve 20 installed in the field FM where the water level is above the threshold be opened. As a result, the drain valve 20 in the field FM where the water level is above the threshold value is opened, draining water from the field FM and lowering the water level in the field FM. In this case, the opening degree of the drain valve 20 instructed may be fully open or a predetermined opening degree smaller than fully open. In addition, the water supply and drainage control unit 322 controls the drain plug 20 to close when the water level monitored for the farm field FM where water is being drained by the drain plug 20 as described above falls below a predetermined level.

[0066] By carrying out the above-described control, it is possible to store rainwater in the field FM during heavy rainfall while adjusting the water level so that it does not overflow the ridges. In this case, the water supply and drainage control unit 322 may open the water gate of the outflow gate GTD, or may close the water gate of the outflow gate GTD if there is sufficient water in the drainage channel.

[0067] Step S110: If it is determined in step S108 that the heavy rain has subsided, the water supply and drainage control unit 322 executes restricted drainage control. Suppressed drainage control is a control that gradually discharges rainwater stored in the field FM into the river RV, for example, at predetermined time intervals or while monitoring the water level. Even after the heavy rain itself has subsided, a considerable amount of water continues to flow into the river RV for a certain period of time. By gradually discharging the rainwater stored in the field FM into the river RV rather than simultaneously discharging it all at once, the amount of water flowing from the field FM into the river RV via the drainage channel is suppressed (limited) to a predetermined level or less, thereby preventing the water level and volume of the river RV from increasing excessively.

[0068] Specifically, as suppressed drainage control, the water supply and drainage control unit 322 may control the drain valves 20 so that water is drained into the drainage channel sequentially for each group of one or more fields FM divided into the group of fields. In this case, when the water supply and drainage control unit 322 determines that the water level for the field FM from which drainage is being performed has dropped to a predetermined lower threshold, it may stop the drainage and, either immediately or after waiting for a predetermined time, control the corresponding drain valve 20 so that drainage is performed for the next predetermined one or more fields FM. The lower threshold may be set taking into account the transition to farming operations thereafter. Furthermore, the water supply and drainage control unit 322 may limit the amount of water drained simultaneously from all the fields FM in the group of fields by adjusting the opening of the drain plugs 20 as restricted drainage control.

[0069] Step S111: When the suppressed drainage control in step S110 ends, the water supply and drainage control unit 322 sends a restriction release request to the irrigation canal management server 300. The restriction release request is a command requesting the lifting of the restrictions on field management for normal times that were set by the field management server 100 in response to the field management restriction request sent in step S103. In response to receiving the restriction lifting request, the farmland management server 100 lifts the restriction on farmland management for normal times. After that, the farmland management server 100 controls the water faucet devices for farmland management for normal times.

[0070] In addition, when making a decision to control the water tap under the water level exceedance prevention control in step S109 or the prevention drainage control in step S110, the flow rate of the drainage channel detected by the drainage sensor (main drainage sensor 60A, tributary drainage sensors 60B, 60B) may be used.

[0071] In addition, the irrigation canal management server 300 may store in the memory unit 103 a history of forced control of faucet devices (discharge of irrigation water from the field FM before the heavy rain, control to prevent water levels from exceeding the limit during the heavy rain, suppressed drainage control after the heavy rain has subsided, etc.) after the occurrence of heavy rain is predicted in step S102.

[0072] Note that the control (pre-drainage control) performed in steps S105 to S107 to reduce the amount of stored water in the field FM to a certain level or less before heavy rain occurs may be omitted. For example, if it is detected that the water level in the field FM is already at or below the lower limit water level or a predetermined level close to the lower limit water level, the pre-drainage control may not be performed. In this case, a drainage stop control may also be sent in step S104 to close the drain plug 20.

[0073] [Notification to farm owners] In this embodiment, when heavy rain occurs as described above, the control of the faucet devices for farming by the farmland management server 100 is restricted, and the irrigation canal management server 300 performs forced control of the faucet devices for rainwater storage, a notification is sent to the farm owner. The manner in which the notification is sent to the farm owner will be described below.

[0074] First, as shown in steps S102 and S103 in FIG. 6, if the irrigation canal management server 300 predicts that heavy rain will occur within a predetermined time, it transmits a farm field management restriction request to the farm field management server 100. In response to receiving a field management restriction request, the field management server 100 stops control of the farming-related water faucet device and issues a corresponding alert (pre-heavy rain alert) to the field owner terminal 200 before heavy rain occurs. The pre-heavy rain notification may, for example, notify the field owner that heavy rain is predicted to occur within a predetermined time and that control of the faucet devices for farming is no longer possible. Furthermore, the pre-heavy rain notification may also notify the field owner that, as a result of the prediction of heavy rain, the irrigation canal management server 300 (i.e., the irrigation manager) has first performed control to forcibly drain the irrigation water from the field FM as part of control of the faucet devices for rainwater storage. When the control to forcibly drain the irrigation water from the field FM is completed over time, the field owner may also be notified of this. The heavy rain warning may also include information such as the area where heavy rain is expected to occur, the time period, and the amount of rainfall.

[0075] The farm land management server 100 may provide a heavy rain warning with the above-mentioned content on, for example, the top page of the farm land management system for farming, which is displayed when the farm land owner terminal 200 accesses the farm land management server 100. Alternatively, the farm land management server 100 may send an email containing the above-mentioned warning content to the farm land owner terminal 200 as a heavy rain warning.

[0076] Furthermore, when the farmland management server 100 stops control of the farming-compatible faucet device in response to the farmland management restriction request, it may be configured to disable the acceptance of certain operations by the farm owner on the farming farm management system. Specifically, it may be configured to disable at least operations such as remotely controlling the faucet device in real time.

[0077] Furthermore, when it is determined that the state before the heavy rain has changed to a state during heavy rain, the farm land management server 100 causes the farm land owner terminal 200 to issue a notification corresponding to the heavy rain (heavy rain notification). The determination that a heavy rain state has occurred may be made, for example, by the irrigation canal management server 300 or the farm owner terminal 200 based on current weather information. Alternatively, the irrigation canal management server 300 or the farm owner terminal 200 may make the determination based on measurement results of the water volume of the river RV. Alternatively, the irrigation canal management server 300 may determine that a heavy rain state has occurred in response to an irrigation canal manager determining that heavy rain has occurred and performing an operation to confirm the occurrence of heavy rain in the irrigation canal management server 300.

[0078] The heavy rain notification may, for example, notify the farm owner that heavy rain is occurring, and that control of the faucet devices for farming will continue to be impossible until the heavy rain subsides, and that control of the faucet devices for rainwater storage will be carried out by the irrigation canal management server 300. The heavy rain notification may also include information such as the current area coverage of the heavy rain, the expected end time of the heavy rain, and the current amount of rainfall.

[0079] The farm land management server 100 may issue the heavy rain notification as described above on the home page of the farm land management system, following the above-mentioned heavy rain notification. Alternatively, the farm land management server 100 may send the heavy rain notification as an email containing the above-mentioned notification content to the farm land owner terminal 200.

[0080] Furthermore, the farmland management server 100 may continue to be unable to accept predetermined operations from the farm owner on the farmland management system during heavy rain.

[0081] 6, the irrigation canal management server 300 performs restricted drainage control and then transmits a restriction release request to the farmland management server 100, as shown in steps S110 and S111. In response to receiving the restriction release request, the irrigation canal management server 300 resumes control of the farming-related faucet devices that had been stopped, as described above. Furthermore, by receiving the restriction lift request, the farm land management server 100 can determine that the heavy rain has subsided. Therefore, in response to receiving the restriction lift request, the farm land management server 100 causes the farm land owner terminal 200 to issue a notification that the heavy rain has subsided (heavy rain subsidence notification).

[0082] The heavy rain convergence notification may, for example, notify the field owner that the heavy rain has converged and the suppression drainage control has been completed, making it possible to control the water faucet devices suitable for farming. Note that the heavy rain convergence notification may also be configured to notify the owner that the suppression drainage control is being performed when the suppression drainage control is being performed in step S110 of Figure 6. In this case, the transition status of the water level in the field FM measured by the water level sensor while the suppression drainage control is being performed may also be notified.

[0083] The farm land management server 100 may issue the heavy rain termination notification with the above-mentioned content on the home page of the farm land management system following the aforementioned heavy rain notification. Alternatively, the farm land management server 100 may send the heavy rain termination notification to the farm land owner terminal 200 by sending an email containing the above-mentioned notification content.

[0084] Second Embodiment [overview] In the first embodiment, in the event of heavy rain in the area (relevant area) where the field FM under the management of the irrigation canal management server 300 is located, only rainwater was stored in the field FM without drawing water from the river RV. However, for example, if heavy rain occurs in an area (upstream or downstream area) upstream or downstream of the basin corresponding to the area of ​​the river RV, the water level of the river RV will also rise in the area, but the amount of rainfall in the area is small. For this reason, even if the field FM in the area stores only rainwater without drawing water from the river RV, it is not possible to effectively suppress the rise in the water level of the river RV. Therefore, in response to heavy rainfall occurring in an upstream or downstream area, the irrigation canal management server 300 of this embodiment actively takes in water from the river RV and stores it in the field FM in the relevant area, as described below. By taking in water from the river RV and storing it in the field FM in this way, it is expected that the rise in the water level of the river RV in the relevant area can be effectively suppressed.

[0085] [Example of processing procedure] An example of a processing procedure executed by the irrigation canal management server 300 in relation to rainwater storage will be described with reference to the flowchart of FIG. The process of step S201 may be the same as step S201 in FIG.

[0086] Step S202: The storage necessity determination unit 321 determines whether or not heavy rain is predicted to occur in the upstream area or the downstream area within a predetermined time based on the weather information acquired in step S101. If heavy rain is not predicted to occur, the process in the figure may be terminated.

[0087] The processing of steps S203 to S207 may be the same as steps S103 to S107 in Fig. 6. By the processing of steps S203 to S207, the water level of each field FM in the relevant region is reduced to a certain level or below in the period before heavy rain occurs, and preparations are made to store water in the event of heavy rain.

[0088] Step S208: After the rainwater storage state is established as described above, if the weather changes and heavy rain falls in the upstream or downstream area at some point, the water supply and drainage control unit 322 determines whether the state has transitioned from a state where water intake is not required to a state where water intake is required. The water intake requirement state is a state in which water should be flowed (taken) from the river RV into the field FM to prevent the water level of the river RV from rising above an allowable limit. The water supply and drainage control unit 322 may determine that the field FM has transitioned to the water intake requirement state when, for example, the degree of increase in rainfall as determined from meteorological information satisfies a predetermined condition. Alternatively, the water supply and drainage control unit 322 may determine that the field FM has transitioned to the water intake requirement state when, for example, the water level of the river RV in an upstream area or downstream area, or the water level of the river RV in the relevant area, reaches or exceeds a certain level.

[0089] Step S209: If it is determined in step S208 that the state has transitioned to a water intake requirement state, the water supply and drainage control unit 322 transmits a water intake request to the farmland management server 100 in the corresponding region. In response to receiving the water intake request, the farm land management server 100 controls the farm land FM to enter a water intake state in which water from the river RV can be taken in. Specifically, to enter the water intake state, the farm land management server 100 controls the water gate of the water inlet gate GTS to be in an open state, and also opens the faucet of the water faucet 10 installed in the farm land FM in the relevant area. In addition, the opening degree of the water gate of the water inlet gate GTS and the opening degree of the tap part of the water hydrant 10 in the water intake state may be fully open, or may be a predetermined opening degree that is smaller than fully open. Alternatively, the opening degree of the water gate of the water inlet gate GTS and the opening degree of the tap part of the water hydrant 10 in the water intake state may be set according to the amount of rainfall, the water level of the river RV, etc. Furthermore, the drain plugs 20 installed in the farm fields FM in the relevant region may be maintained in the closed state obtained in steps S206 and S207.

[0090] Step S210: If it is determined in step S208 that the state has not transitioned to a state requiring water intake, or after the processing of step S209, the water supply and drainage control unit 322 determines whether the state requiring water intake has been resolved. The water supply and drainage control unit 322 may determine that the state requiring water intake has been resolved when, for example, the degree of decrease in rainfall as determined from meteorological information satisfies a certain condition. Alternatively, the water supply and drainage control unit 322 may determine that the state requiring water intake has been resolved when, for example, the water level of the river RV in the upstream area or downstream area, or the water level of the river RV in the relevant area, falls below a certain level.

[0091] Step S211: If it is determined in step S210 that the water intake requirement state has been resolved, the water supply and drainage control unit 322 sends a water intake stop request to the farm land management server 100. In response to receiving the water intake stop request, the farm field management server 100 controls the farm field FM to change from the previous water intake state to a water intake stop state in which water from the river RV cannot be taken into the farm field FM. Specifically, the farm field management server 100 closes the valves of the water hydrants 10 installed in the farm field FM in the relevant area. At this time, the farm field management server 100 may also control the sluice gates of the water inlet gates GTS to be closed. Alternatively, the farm field management server 100 may close the sluice gates of the water inlet gates GTS and leave the valves of the water hydrants 10 in an open state to stop the water intake.

[0092] If it is determined in step S210 that the water intake requirement state has not been resolved, or after the processing of step S211, the processing of steps S212 and S213 is executed. The processing of steps S212 to S213 may be similar to steps S108 and S109 in Fig. 6. However, after the water level exceedance prevention control is executed in step S213, the processing returns to step S208, so that a transition between the water intake requirement state and the water intake suspension state can be made depending on the situation during heavy rain.

[0093] The processes in steps S214 and S215 are the same as those in steps S110 and S111 in FIG.

[0094] In addition, when making the judgments in steps S208 and S210, the flow rate of the water supply line detected by the water supply sensor (main water supply sensor 50A, tributary water supply sensor 50B) and the flow rate of the drainage line detected by the drainage sensor (main drainage sensor 60A, tributary drainage sensors 60B, 60B) may be used.

[0095] <Modification> Modifications of this embodiment will be described below. The following modifications can be combined as appropriate.

[0096] [First Modification] This modified example corresponds to the second embodiment. In a situation where the water level of the river RV is rising due to heavy rain, the water in the river RV may become muddy. For this reason, when water is taken from the river RV into the field FM in response to heavy rain in the upstream or downstream area as in the second embodiment, muddy water may flow into the field FM. When taking water from the field FM into the river RV, it is preferable to avoid muddy water as much as possible. Therefore, in this modified example, a storage tank is provided upstream of the field FM on the route from the water inlet gate GTS through the water supply channel to the field FM to store the water flowing in from the river RV.

[0097] Fig. 8 shows an example of the overall configuration of an irrigation water management system corresponding to this modified example. In this figure, the same parts as in Fig. 1 are given the same reference numerals and their explanations will be omitted. In the figure, there is one group of fields that corresponds to the second group of fields in Figure 1. In addition, in this modified example, storage tanks 80-1 and 80-2 are provided. When there is no need to distinguish between storage tanks 80-1 and 80-2, they will be referred to as storage tank 80. The storage tank 80 may be provided by burying, for example, a large-diameter pipe (for example, RCP (fiber reinforced composite pipe)) or a rainwater infiltration tank underground.

[0098] Tributary water supply channel BSP-1, which branches off from the main water supply channel MSP, is further branched into tributary water supply channels BSP-11 and BSP-12. The storage tank 80-1 is provided with a water supply valve 81. A tributary water supply channel BSP-11 is connected to the water supply valve 81. The storage tank 80-1 is also provided with a drain valve 82. A tributary drain channel BDR-11 is connected to the drain valve 82. The storage tank 80-2 is also provided with a water supply valve 81 and a drain valve 82. The water supply valve 81 of the storage tank 80-2 is connected to a tributary water supply channel BSP-12, and the drain valve 82 of the storage tank 80-2 is connected to a tributary drain channel BDR-12. The opening degrees of the water supply valve 81 and the drain valve 82 are controlled by the irrigation channel management server 300 .

[0099] The tributary supply channels (BSP-1, BSP-11, BSP-12) that supply irrigation water to the storage tanks 80-1 and 80-2 are located upstream of the tributary supply channel BSP-2 that supplies water to the field FM in the main supply channel MSP. In other words, the storage tank 80 can take in and store water that flows in from the river RV upstream of the field FM.

[0100] The irrigation canal management server 300 of this modified example may execute control according to the same procedure as in FIG. 7 for a group of farm fields. Then, in response to the need for water intake, the irrigation canal management server 300 of this modified example also stores water taken from the river RV in the storage tank 80. At this time, the irrigation canal management server 300 controls the water supply valve 81 in the storage tank 80 to be open and the water discharge valve 82 to be closed.

[0101] In this way, in this modified example, when water intake is required and water taken from the river RV is stored in the field FM, water taken from the same river RV is also stored in the storage tank 80. The storage tank 80 is located upstream of the field FM in the water supply channel. Therefore, even if the river RV becomes muddy, most of the muddy water is first stored in the storage tank 80. As a result, it is possible to reduce the turbidity of the water stored in the field FM.

[0102] After the heavy rain subsides, the irrigation canal management server 300 may also perform suppression drainage control on the water stored in the storage tank 80. In this case, the irrigation canal management server 300 may perform suppression drainage control so that the timing of draining water from the field FM and the timing of draining water from the storage tank 80 differ from each other.

[0103] In the figure, an example is shown in which the upstream side of tributary drainage channel BDR-21 is connected to tributary supply channel BSP-1. By connecting tributary drainage channel BDR-21 to tributary supply channel BSP-1 in this way, water flowing into tributary supply channel BSP-1 flows not only to storage tanks 80-1 and 80-2 but also to tributary drainage channel BDR-21. As a result, even if storage tank 80 becomes full, for example, some of the water flowing into main supply channel MSP can be diverted to main drainage channel MDR via tributary supply channel BSP-1 and tributary drainage channel BDR-21, preventing water from overflowing from main supply channel MSP.

[0104] The number of storage tanks 80 provided for one main water supply channel MSP is not particularly limited. In addition, although two storage tanks 80 are provided in parallel in the figure, they may be provided in series.

[0105] [Second Modification] This modified example is a modification of the first modified example in which a storage tank is provided upstream of the farm field FM. Fig. 9 shows an example of the overall configuration of an irrigation water management system corresponding to this modified example. In this figure, the same parts as those in Fig. 1 and Fig. 8 are given the same reference numerals and their explanations will be omitted. In the irrigation management system of FIG. 8, a storage tank 80 is provided in the tributary supply channel BSP-1 that branches off from the main supply channel MSP upstream of the tributary supply channel BSP-2 that supplies water to the farm field FM. In contrast to this, in this modified example, a storage tank 80A is provided between the upstream main supply channel MSP-U and the downstream main supply channel MSP-D, as shown in Figure 9. In other words, as in this modified example, the storage tank 80A may be provided in the main supply channel upstream of the field FM. In the example shown in the figure, water flows into the storage tank 80A from the upstream main supply channel MSP-U via a water supply valve 81. The water in the storage tank 80A can be discharged into the tributary drainage channel BDR-1 via a drainage valve 82-1, and can also be discharged into the downstream main supply channel MSP-D via a drainage valve 82-2.

[0106] In this case, the irrigation canal management server 300 controls the storage tank 80A to store water during normal times, or to supply water taken in from the river RV through the water inlet gate GTS to the storage tank 80A via a bypass route (not shown) to the downstream main supply canal MSP-D without storing the water in the storage tank 80A. This enables the farm field management server 100 to supply irrigation water for farming purposes to the field FM during normal times. In response to heavy rain, the irrigation canal management server 300 may, for example, first store water taken from the river RV in a storage tank 80A, and then, when the amount of water stored in the storage tank 80A reaches a certain level or more, appropriately discharge water from the storage tank 80A into the tributary drainage channel BDR-1 and the downstream main water supply channel MSP-D. With this configuration, if it is possible to suppress the rise in the water level of the river RV during heavy rain by storing water in the storage tank 80, it becomes unnecessary to store turbid water in the field FM. Furthermore, even if turbid water is stored in the field FM, it is possible to suppress the turbidity of the water.

[0107] [Third Modification] In each of the above embodiments, the faucet devices (water supply faucets 10, drain faucets 20) were designed to adjust the flow rate from the water inlet to the water outlet by adjusting the opening of the faucet section. Furthermore, when the irrigation canal management server 300 controlled the faucet devices to set the water level in the field FM to a certain target value, it monitored the water level detected by a water level sensor installed in the field FM.

[0108] In this modified example, a water level adjustment pipe is used instead of the drain plug 20 as a drainage device that drains water from the field FM into the drainage channel. The water level adjustment pipe is a drainage pipe that is installed so that the water level in the field FM can be adjusted by adjusting the height of its upper opening. In this modified example, the height of the upper opening of the water level adjustment pipe can be adjusted by control of the farm land management server 100.

[0109] 10(A) shows an example of a farm field FM in which a water level adjusting pipe 70 is used as a drainage device. In this figure, the same parts as those in FIG. 1 etc. are given the same reference numerals and explanations thereof will be omitted as appropriate. The water level adjustment pipe 70 is arranged in the farm field FM so that the extension direction of the pipe section is along the vertical direction as shown in the figure. The water level adjustment pipe 70 can be operated by the drive unit 20A so that it can move up and down within a predetermined movable range. The drive unit 20A can drive the water level adjustment pipe 70 in response to manual operation, for example. Furthermore, the drive unit 20A can communicate with the irrigation canal management server 300, and can therefore drive the water level adjustment pipe 70 in response to the control of the irrigation canal management server 300. The lower side of the water level adjustment pipe 70 is connected to one end of a drainage pipe 71. The drainage pipe 71 is buried under the ridge RD, and the other end is provided to discharge water into the tributary drainage channel BDR. The figure also shows an example in which a water level sensor 30 for farming and a water level sensor 40 for irrigation canal management are installed in the field FM. In this modified example, the water level sensor 30 for farming is capable of detecting (measuring) water levels up to an upper limit determined according to the farming operation. Furthermore, the water supply tap 10 in the figure adjusts the amount of water taken in from the tributary water supply channel BSP and supplied to the farm field FM, as in the previous embodiment.

[0110] In the case of a farm field FM equipped with a water level adjustment pipe 70 as described above, the target water level during farming is set corresponding to the height of the upper opening of the water level adjustment pipe 70. Figure 10(A) shows a state in which the height of the upper opening of the water level adjustment pipe 70 is set to the same as the upper limit water level during farming, so that the water level in the farm field FM is the upper limit water level during farming.

[0111] Furthermore, Figure 10(B) shows that the height of the upper opening of the water level adjustment pipe 70 is set lower than in Figure 10(A), and therefore the water level in the field FM is lower than the upper limit water level during farming operations.

[0112] In this modified example, the irrigation canal management server 300 controls the height of the upper water inlet of the water level adjustment pipe 70 to achieve a target water level when forcibly controlling faucet devices (such as discharging irrigation water from the field FM before heavy rain, storing rainwater during heavy rain and preventing water level excesses during heavy rain, and suppressing drainage control after the heavy rain has subsided). For this purpose, the irrigation canal management server 300 controls the drive device 20A so that the upper opening of the water level adjustment pipe 70 is at a height corresponding to the target water level. Control in this case may be performed via the field management server 100. Furthermore, when forcibly controlling the faucet devices, it is necessary to monitor and adjust the water level, including the range of water levels higher than the upper limit that can be detected by the agricultural water level sensor 30. Therefore, when forcibly controlling the faucet devices, the irrigation canal management server 300 uses the water level detected by the irrigation canal management sensor 40.

[0113] [Fourth Modification] In the third modified example, the upper limit of the water level adjustment range of the water level adjustment pipe 70 that adjusts the water level may be lower than the height of the ridge. However, during heavy rain, there may be cases where it is desired to store rainwater in the field FM with the height of the ridge as the upper limit. In this case, in the field FM equipped with the water level adjustment pipe 70, rainwater can only be stored up to the upper limit of the water level adjustment range of the water level adjustment pipe 70, which is lower than the height of the ridge. Therefore, in this modified example, as will be explained below, even in a farm field FM equipped with a water level adjustment pipe 70, it is possible to store rainwater in the farm field FM with the height of the ridges as an upper limit.

[0114] Figure 11(A) shows an example of a farm field FM corresponding to this modified example. In this figure, the same parts as in Figures 10(A) and 10(B) are given the same reference numerals, and explanations thereof will be omitted as appropriate. In the farm field FM shown in the figure, an enclosure box BX is provided so as to cover the water level adjusting pipe 70. The enclosure box BX is provided so that the height of the upper surface thereof is the same as the height h of the ridge RD. The enclosure BX has an open top and an opening OP on the side, which is opened and closed by the gate G as the driving device 20B drives the gate G to move up and down.

[0115] FIG. 11(A) shows a state in which the opening OP is open as a result of the gate G being pulled up. When the opening OP is open, water from the field FM enters through the side of the enclosing box BX through the opening OP. In this case, the upper limit of the water level in the field FM is determined by the height of the upper opening of the water level adjustment pipe 70. That is, in this case, the water level in the field FM is adjusted by adjusting the height of the upper opening of the water level adjustment pipe 70. During farming, the water level in the field FM is adjusted by opening the opening OP of the enclosing box BX in this way and then adjusting the height of the water level adjustment pipe 70.

[0116] On the other hand, when forced control of the faucet device is performed in response to the occurrence of heavy rain (such as draining irrigation water from the field FM before the heavy rain, storing rainwater and preventing water level from exceeding during the heavy rain, and suppressing drainage control after the heavy rain has subsided), the irrigation canal management server 300 controls the drive unit 20B so that the opening OP of the enclosure box BX is closed by the gate G. At this time, the water level adjustment pipe 70 does not need to be controlled to a specific height. In addition, in this case, the control of the drive unit 20B by the irrigation canal management server 300 may be performed via the field management server 100. In this modified example, during heavy rain, because the opening OP of the enclosing box BX is closed as described above, the water in the field FM is stored without flowing into the opening OP, causing the water level to rise. Then, when the water level reaches the top of the enclosing box BX, the water stored in the field FM will flow into the enclosing box BX from the top. Therefore, the water level in the field FM in this case is maintained at the height of the ridge RD corresponding to the top of the enclosing box BX. In this way, in this modified example, even if the maximum water level to be stored in the field FM in response to heavy rain (maximum water level for storage) is higher than the range that can be adjusted by the water level adjustment pipe 70, by providing the enclosure box BX, it is possible to maintain the field FM at the maximum water level for storage when heavy rain occurs.

[0117] In the third and fourth modified examples, a drain plug may be further provided in the field FM to assist in draining water from the field FM before heavy rain occurs. This makes it possible to drain water from the field FM before heavy rain occurs in a shorter time.

[0118] [Fifth Modification] In each of the above embodiments, in addition to the water supply tap 10, a water supply tap compatible with irrigation canal management that cannot be controlled by the farm field management server 100 but can be controlled by the irrigation canal management server 300 may be provided in the field FM. Similarly, in addition to the drain plug 20, a water supply tap compatible with irrigation canal management that cannot be controlled by the farm field management server 100 but can be controlled by the irrigation canal management server 300 may be provided in the field FM. In this case, in response to the prediction of heavy rain, the irrigation canal management server 300 restricts the control by the field management server 100 of all water supply valves 10 and drain valves 20, and then controls the water supply valves and drain valves compatible with irrigation canal management when forcibly controlling the water valve devices (discharge of irrigation water from the field FM before heavy rain, control to prevent water levels from exceeding the limit during heavy rain, control to suppress drainage after the heavy rain has subsided, etc.).

[0119] [Sixth Modification] The irrigation canal management server 300 and the farmland management server 100 may be integrated into a single server. Alternatively, the functions of the irrigation canal management server 300 may be distributed among multiple servers. Furthermore, the functions of the farmland management server 100 may be distributed among multiple servers.

[0120] Note that programs for implementing the functions of the above-described water tap devices (water taps 10, drain taps 20), farmland management server 100, irrigation canal management server 300, farmland owner terminal 200, etc. may be recorded on a computer-readable recording medium, and the programs may be loaded into a computer system and executed to perform the processing of the above-described water tap devices (water taps 10, drain taps 20), farmland management server 100, irrigation canal management server 300, farmland owner terminal 200, etc. Here, "loading a program recorded on a recording medium into a computer system and executing it" includes installing the program into a computer system. The term "computer system" here includes hardware such as an operating system and peripheral devices. The term "computer system" may also include multiple computer devices connected via a network, including communication lines such as the Internet, a wide area network (WAN), a local area network (LAN), and a dedicated line. The term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into a computer system. In this way, the recording medium storing the program may be a non-transitory recording medium such as a CD-ROM. The recording medium also includes internal or external recording media accessible from a distribution server for distributing the program. The program code stored on the distribution server's recording medium may be different from the program code in a format executable by a terminal device. In other words, the format in which the program is stored on the distribution server is not important as long as it can be downloaded from the distribution server and installed in a format executable by a terminal device. The program may be divided into multiple parts, downloaded at different times, and then combined on a terminal device, or each of the divided programs may be distributed by a different distribution server. Furthermore, the term "computer-readable recording medium" also includes a medium that retains a program for a certain period of time, such as volatile memory (RAM) within a computer system that serves as a server or client when a program is transmitted over a network. The program may also be for implementing part of the above-mentioned functions.Furthermore, the above-mentioned functions may be realized in combination with a program already recorded in the computer system, that is, a so-called differential file (differential program). [Explanation of symbols]

[0121] 10 water supply valve, 20 drain valve, 30 water level sensor, 40 water level sensor, 50A main water supply sensor, 50B tributary water supply sensor, 60A main drainage sensor, 60B tributary drainage sensor, 80 (80-1, 80-2, 80A) storage tank, 100 farmland management server, 101 communication unit, 102 control unit, 103 memory unit, 131 farmland management information memory unit, 200 farmland owner terminal, 300 irrigation canal management server, 301 communication unit, 302 control unit, 303 memory unit, 321 storage necessity determination unit, 322 water supply and drainage control unit, 331 irrigation canal information memory unit, 332 tributary water supply canal information memory unit, 333 tributary drainage canal information memory unit, 334 water level sensor information memory unit

Claims

1. a water faucet device including a water supply device provided to supply water to a field and a drainage device provided to drain water from the field; an irrigation canal management server that manages irrigation water connected to the farm field; a farm management server that performs farm management control, including at least one of controlling the opening and closing of the water supply device and the drainage device according to a farming schedule and controlling the opening and closing of the water supply device and the drainage device in response to remote control from a farm owner's terminal; a water inlet gate connected to a river; the irrigation canal management server is equipped with a water supply and drainage control unit that controls water flowing from a river into a farm field, and is capable of controlling the faucet devices for rainwater storage in priority to the control of the faucet devices for farming by the farm field management server; When the water supply and drainage control unit determines that rainwater storage is necessary in response to the occurrence of heavy rain upstream or downstream of a watershed of a river that is a source of water supply to the field and that corresponds to the area in which the field is located, it sends a water intake request to the field management server in the corresponding area to execute control of the water faucet device for rainwater storage in priority to control of the water faucet device for farming by the field management server; In response to receiving the water intake request, the farm management server controls the water inlet gate to be in an open state, thereby performing heavy rain response control to control the water flow from the river into the farm field. A field water management system characterized by the above.

2. a water faucet device including a water supply device provided to supply water to a field and a drainage device provided to drain water from the field; an irrigation canal management server that manages irrigation water connected to the farm field; a farm management server that performs farm management control, including at least one of controlling the opening and closing of the water supply device and the drainage device according to a farming schedule and controlling the opening and closing of the water supply device and the drainage device in response to remote control from a farm owner's terminal; A field water management method performed by a field water management system comprising: the irrigation canal management server is equipped with a water supply and drainage control unit that controls water flowing from a river into a farm field, and is capable of controlling the faucet devices for rainwater storage in priority to the control of the faucet devices for farming by the farm field management server; When the water supply and drainage control unit determines that rainwater storage is necessary in response to the occurrence of heavy rain upstream or downstream of a watershed of a river that is a source of water supply to the field and that corresponds to the area in which the field is located, it sends a water intake request to the field management server in the corresponding area to execute control of the water faucet device for rainwater storage in priority to control of the water faucet device for farming by the field management server; In response to receiving the water intake request, the farm management server controls the water inlet gate to be in an open state, thereby performing heavy rain response control to control the water flow from the river into the farm field. A field water management method characterized by the above.

3. a water faucet device including a water supply device provided to supply water to a field and a drainage device provided to drain water from the field; an irrigation canal management server that manages irrigation water connected to the farm field; a farm management server that performs farm management control, including at least one of controlling the opening and closing of the water supply device and the drainage device according to a farming schedule and controlling the opening and closing of the water supply device and the drainage device in response to remote control from a farm owner's terminal; a water inlet gate connected to the river; the irrigation canal management server is equipped with a water supply and drainage control unit that controls water flowing from a river into a farm field, and is capable of controlling the faucet devices for rainwater storage in priority to the control of the faucet devices for farming by the farm field management server; The farm field management server controls the water inlet gate to be in an open state in response to a water intake request transmitted from the irrigation canal management server, thereby executing heavy rain response control to control water from a river to flow into the farm field. When it is determined that rainwater storage is necessary in response to the occurrence of heavy rain upstream or downstream of the basin of a river that is a source of water supply to a farm field and that corresponds to the area in which the farm field is located, a water intake request is sent to the farm field management server in the corresponding area to execute control of the water faucet device for rainwater storage, prior to control of the water faucet device for farming by the farm field management server. A program that makes it happen.

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