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

Abstract

To appropriately control an action of a drainage device which allows a farm field such as a rice paddy to store water corresponding to a weather condition.SOLUTION: A farm field water management system comprises: a drainage device which is provided so as to discharge water from a farm field; and a drainage control part which controls the drainage device so as to create a state where water can be stored in the farm field while control of the drainage device which is performed corresponding to farming is limited.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 by manually operating a handle of a discharge volume adjustment unit. From the viewpoint of work efficiency and safety, it is preferable to appropriately control the operation of the drainage device for storing water in a field such as a rice paddy depending on weather conditions such as heavy rain.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a method for appropriately controlling the operation of a drainage device for storing water in a field such as a rice paddy, depending on weather conditions. [Means for solving the problem]

[0006] One aspect of the present invention for solving the above-mentioned problems is a field water management system comprising a drainage device arranged to drain water from a field, and a drainage control unit that limits control of the drainage device performed in response to farming operations and controls the drainage device so that water can be stored in the field.

[0007] One aspect of the present invention is a field water management method in a field water management system equipped with a drainage device that drains water from a field, the field water management method including a drainage control step of limiting control of the drainage device that is performed in response to farming operations, and controlling the drainage device so that water can be stored in the field.

[0008] One aspect of the present invention is a program for causing a computer in a field water management system equipped with a drainage device that drains water from a field to function as a drainage control unit that limits the control of the drainage device that is performed in response to farming operations, and controls the drainage device so that water can be stored in the field. Effect of the Invention

[0009] According to the present invention, it is possible to obtain an effect that the operation of a drainage device for storing water in a farm field such as a rice paddy can be appropriately controlled in accordance with weather conditions. [Brief description 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; [Diagram 2] 2 is a diagram illustrating an example of a functional configuration of a farm land management server according to the first embodiment. FIG. [Diagram 3] FIG. 2 is a diagram showing an example of farm field management information according to the first embodiment. [Figure 4] 2 is a diagram illustrating an example of a functional configuration of an irrigation canal management server according to the first embodiment. FIG. [Diagram 5] 4A to 4D 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 channel management server according to the first embodiment in relation to rainwater storage. [Figure 7] 13 is a flowchart showing an example of a processing procedure executed by the irrigation channel management server according to the second embodiment in relation to rainwater storage. [Figure 8] FIG. 2 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. 11 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. 13 is a diagram showing an example of a farm field according to a third modified example of the present embodiment. [Figure 11] FIG. 13 is a diagram showing an example of a farm field according to a fourth modified example of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 (farming management)" and "irrigation canal management" as "irrigation water management." Field management is management of a field conducted by a field owner (farmer) for farming, and includes the supply and drainage of irrigation water in a field for farming. Irrigation canal management is a higher level of 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 that the irrigation management system handles will be described 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 performed to maintain appropriate water levels depending on the rice cultivation season. In the following description, when there is no particular need to distinguish between the fields FM-11 to FM-16 and the fields FM-21 to FM-26, they will be referred to as the field FM. 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] The field FM is supplied with water drawn from the river RV as follows: For river RVs, a water inlet gate GTS is provided. The water inlet gate GTS includes, for example, a water gate and a pump. The water inlet gate GTS is assigned a water inlet gate ID (identifier). The waterway management server 300 controls the opening and closing of the water gate and the driving of the pump at the water inlet gate GTS via the network NW, thereby adjusting the amount of water flowing into the main supply waterway MSP.

[0014] The irrigation 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 so as to penetrate the first group of fields. A predetermined number of water faucets 10 (an example of a water supply device) are provided in each of the fields FM in the first group of fields in correspondence with the tributary supply channels BSP-1. The water faucets 10 adjust the amount of water supplied from the water inlet and discharged from the discharge outlet according to the degree of opening of a valve (valve) 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 irrigation water to the corresponding fields FM by discharging irrigation water supplied from the tributary supply channel BSP-1 into the fields FM. The water taps 10 installed in the fields FM of the second group of fields supply water to the corresponding fields FM by discharging water supplied from the tributary water supply channel BSP-2.

[0015] As described above, each water tap 10 provided in the field FM is assigned a water tap ID. The water taps 10 adjust the amount of water supplied to the field FM by changing the opening degree according to the control by the field management server 100 via the network NW.

[0016] Furthermore, a tributary drainage channel BDR-11 is arranged on the opposite bank of the tributary 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 portion (valve) provided in the flow path between the water inlet and the drain outlet. The drain plug 20 discharges irrigation water stored in the corresponding farm field FM into the tributary drainage channel BDR-11. In addition, a tributary drainage channel BDR-12 is arranged on the opposite bank of the tributary supply channel BSP-1 of the fields FM-14 to FM-16 in the first group of fields. A predetermined number of drainage plugs 20 are provided in each of the fields FM in the second group of fields in correspondence with the tributary drainage channel BDR-12. The drainage plugs 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 arranged on the opposite bank of the tributary supply channel BSP-2 of the fields FM-21 to FM-23. A predetermined number of drainage plugs 20 are provided in each of the fields FM in the second group of fields in correspondence with the tributary drainage channel BDR-21. The drainage plugs 20 discharge irrigation water stored in the corresponding field FM into the tributary drainage channel BDR-21. Furthermore, in the first group of fields, a tributary drainage channel BDR-22 is arranged on the opposite bank of the tributary supply channel BSP-2 of the fields FM-24 to FM-26. A predetermined number of drainage plugs 20 are provided in each of the fields FM in the second group of fields in correspondence with the tributary drainage channel BDR-22. The drainage plugs 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 provided 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 according to 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. The example shows that 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. A flood gate ID is assigned to the flood gate GTD. The irrigation channel management server 300 controls the opening and closing of the water gate and the driving of the pump in 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 the 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 supply channel BSP (BSP-1, BSP-2). The tributary water supply sensor 50B detects the flow rate of the irrigation water in the corresponding tributary 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 of the tributary drainage channels 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 downstream of the tributary drainage channel BDR in the mainstream drainage channel MDR. 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] Further, each of the fields FM is provided with a water level sensor 30 for agricultural use. 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 field management server 100 via the network NW. The water level sensor 30 may transmit the detected water level to the 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 by wireless communication or wired communication.

[0025] Further, a water level sensor 40 for irrigation channel management is provided in each of the farm fields FM. The water level sensor 40 detects the water level of the corresponding farm 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 channel 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 farm land management server 100 is a server operated by a farm manager who has a contract for a farm land management service with the owner of the farm land FM. The farm land management server 100 is capable of communicating with a farm land owner terminal 200, water tap devices (water supply taps 10, drain taps 20), a farm water level sensor 30, and the like via a network NW. The farm field 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 ensuring that the water level in the farm field FM is maintained 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 remotely control the opening of the faucet device in real time 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 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 the field FM at a higher level than the field management server 100. The irrigation canal management server 300 is communicatively connected 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 via a network NW.

[0030] The irrigation canal management server 300 normally adjusts the amount of water supplied to and drained from the groups of fields (the first group of fields and the second group 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 appropriately controls the opening of the water gates at the water inlet gate GTS and the water outlet gate GTD.

[0031] The irrigation canal management server 300 acquires meteorological 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 meteorological information. Specifically, when the irrigation canal management server 300 predicts, based on weather information, for example, that a certain amount of rainfall (heavy rain) will occur after a certain time, it determines that it is necessary to store the rainwater in the field FM instead of draining it (rainwater storage) in accordance with the time period during which the heavy rain will occur. When it is determined that rainwater storage is necessary, the irrigation channel management server 300 executes control of the faucet devices for rainwater storage in priority to the control of the faucet devices for farming by the farm field management server 100. A specific example of the control of the faucet devices for rainwater storage executed by the irrigation channel management server 300 will be described later. In addition, the water manager may determine 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 outflow gate GTD, sensors installed in the irrigation canal, and the water level sensors 40 in each field FM, and present it to the water manager by display or the like, thereby prompting him or her to determine whether or not it is necessary to store rainwater.

[0032] [Example of the configuration of a field management server] 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 the figure are realized by executing a program by a CPU (Central Processing Unit) included 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 taps 10, drain taps 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 set for each period and time period determined 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 terminal 200 by the farm owner's operation on the farm owner 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 the field management information. The field management information is management information for each field FM.

[0035] Fig. 3 shows an example of the field management information stored in the field management information storage unit 131. One row (one record) in the figure is the field management information corresponding to one field. The field management information corresponding to one field includes areas for a field ID, a water supply valve ID, a drain plug ID, an agricultural water level sensor ID, field owner information, field owner terminal information, and a farming schedule. The field ID area stores the field ID assigned to the corresponding field FM. The water faucet ID field stores the water faucet ID for each water faucet 10 provided in the corresponding farm 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 agricultural water level sensor ID stores the sensor ID of the agricultural water level sensor 30 installed in the corresponding farm field FM. The field for the owner information stores information about the corresponding owner of the field (owner information). The owner information includes the owner ID given to the corresponding owner of the field. 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 given 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 level required for farming in the corresponding field FM is set in units of months, weeks, dates, etc.

[0036] [Example of the configuration of a waterway management server] An example of the functional configuration of the irrigation channel management server 300 will be described with reference to Fig. 4. The functions of the irrigation channel management server 300 in the figure are realized by executing a program by a CPU included in the irrigation channel management server 300. The irrigation channel 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 channel 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 waterway. That is, the water supply and drainage control unit 322 adjusts the amount of water flowing (supplied) from the river RV to the main water supply channel MSP and the amount of water flowing (discharged) 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 judges whether or not rainwater storage is necessary based on meteorological information. If the water supply and drainage control unit 322 judges that rainwater storage is necessary, it executes control of the faucet device for rainwater storage in priority to the control of the faucet device for farming by the farmland management server 100.

[0038] The storage unit 303 stores various 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 canal MSP, main drainage canal MDR, tributary supply canal BSP, tributary drainage canal 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 water faucet 10 and the tributary supply sensor 50B provided corresponding to 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 the 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 sensor 40 for managing the irrigation channel provided in the farm field FM in the corresponding region.

[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 given to the river RV that is the source and destination of water. 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 passage 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 field 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 channel information stored in the tributary supply channel information storage unit 332. One record in the figure is tributary supply channel information corresponding to one tributary supply channel BSP. The supply channel information corresponding to one tributary supply channel BSP includes areas for a tributary supply channel ID, a field ID, a water faucet ID, and a tributary water supply sensor ID. The tributary water supply channel ID field stores the tributary water supply channel ID assigned to the corresponding tributary water 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 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 supply passage 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 areas for a tributary drainage channel ID, a field ID, a drain plug ID, and a 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 into which drainage is provided by the corresponding tributary drainage channel BDR. The drain plug ID field stores the drain plug ID for each drain plug 20 that is provided to drain water from the corresponding tributary drainage channel BDR into 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] Fig. 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 the figure has a structure in which a water level sensor ID for irrigation canal management is 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 provided for each field FM.

[0047] [About rainwater storage] In the irrigation water management system of this embodiment, the irrigation water channel management server 300 in normal times controls the opening of the water gates at the water inlet gate GTS and the water outlet gate GTD according to a water allocation schedule determined for normal times, for example. This allows the irrigation water channel management server 300 to supply water to the farm field FM or stop the supply of water according to the water allocation schedule.

[0048] In addition, under normal circumstances, the farm field management server 100 controls the opening degree of the water faucet devices according to the set farming schedule and remote operation from the farm 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 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 faucet devices.

[0049] Here, when heavy rain occurs 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 area including the field FM or a certain area upstream of the river RV to which the field FM corresponds. When heavy rain occurs in the relevant 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 the rainwater flows from the field FM into the river RV in this way, the water level of the river RV further rises, and there is a possibility that the river RV will overflow.

[0050] When the floodgate GTD is closed, the rainwater in 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.

[0051] Therefore, the irrigation management system of this embodiment stores rainwater in response to heavy rain in the relevant area. That is, in response to heavy rain in the relevant area, the irrigation management system stores rainwater that has fallen on 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, the water level information of the river RV is suppressed. In addition, 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, farm field management is restricted. For this reason, the irrigation canal management server 300 takes the initiative in controlling rainwater storage, and the farm field management server 100 functions to relay the control of the faucet device by the irrigation canal management server 300.

[0052] [Example of processing procedure] An example of a process procedure executed by the irrigation channel 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 acquire weather information for the area corresponding to the group of farm fields, for example, when triggered by the passage of a certain period of time, an instruction from an irrigation canal, etc. The storage necessity determination unit 321 may acquire weather information by accessing a weather information server that provides weather information via the network NW.

[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 has become necessary, for example, when an irrigation canal manager has determined that rainwater storage is necessary and an operation to instruct the activation of forced control of faucet devices, etc. for rainwater storage is performed 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 transmits a field management restriction request to the field management server 100 that manages the field FM (group of fields) in the corresponding area. The field management server 100 that receives the field management restriction request restricts the field management that corresponds to normal times. Specifically, the farm land management server 100 forcibly stops the control of the faucet device according to the farming schedule under normal circumstances and the control of the faucet device in response to remote control from the farm land owner terminal 200. Also, instead of stopping the control of the faucet device in response to remote control from the farm land owner terminal 200, it is also possible to give priority to the control of the faucet device for rainwater storage by the irrigation canal management server 300 in S104 and S015 described below. Furthermore, as a forcible stop of farm land management, the farm land management server 100 may control the faucet device so that the opening degree of the faucet device itself cannot be adjusted manually.

[0056] By executing step S103, the farm land management server 100 will no longer control the faucet devices corresponding to farming, and the irrigation canal management server 300 will be able to control the faucet devices for rainwater storage. From then on, the farm land 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 transmits a water supply stop request to the farm land 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 water supply. In response to the transmission of the water supply stop request, the farm land management server 100 performs control to forcibly close all of the water taps 10 in the corresponding area, 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 inlet gate GTS to close, thereby stopping the inflow of water from the river RV into the water supply channel.

[0058] Step S105: The water supply and drainage control unit 322 also sends a drainage request to the farm management server 100 together with the water supply stop request sent in step S104. 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 farm management server 100 controls all drain plugs 20 in the relevant area to be forcibly opened.

[0059] By the control of steps S104 and S105, water is drained without being supplied in the field FM in the corresponding region, so the water level drops. In other words, by the control of steps S104 and S105, the water supply and drainage control unit 322 forcibly lowers the water level in the field FM in the corresponding region before heavy rain occurs. 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 tap 10 or a drain tap 20 that is not in use may result in an unexpected accident, water supply taps 10 and drain taps 20 that are to be compulsorily controlled may be excluded from compulsory control if there is no recent farming schedule registered, if the obtained current location information is not the location of a specified field that has been registered in advance, or if the taps have stopped due to an abnormality. For example, water supply taps 10 and drain plugs 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 taps 10 and drain plugs 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 provided 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 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 (drainage stop control). 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 the current stage. If it is determined that the drainage stop control has not been completed for all of the farm fields FM, the process returns to step S106.

[0061] At the stage where the processing up to step S107 is completed, all fields FM in the corresponding region are set to the lower limit water level and all water supply valves 10 and drain valves 20 are closed. As a result, the field FM is in a state where it can store an amount of rainwater according to the size of the field FM without receiving irrigation water from the water supply channel. 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 drain plugs 20 may be forcibly closed even for fields FM for which drainage stop control has not yet been completed.

[0062] In addition, instead of the processing of 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 drain plug 20 of each field FM to be closed upon the elapse of the predetermined time.

[0063] Step S108: After the rainwater is stored 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 processes of steps S106 and S107, and determines the weather at that time based on the acquired meteorological information. 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 by, for example, determining whether a state in which the amount of rainfall based on the meteorological information is below a certain level has continued 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 from 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 the 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 excess prevention control. The water level excess 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 to be higher than an upper limit water level determined in response to farming (farming-compatible upper limit water level) and lower than the height of the ridge. The storage compatible upper water level may be set by the farm owner or farm manager.

[0065] As 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 of each field FM, and judges whether there is a field FM in which the monitored water level is equal to or higher than the threshold value set in correspondence with the upper limit water level for storage. When it is judged that there is a field FM in which the water level is equal to or higher than the threshold value, the water supply and drainage control unit 322 executes control to open the drain plug 20 in the field FM in which the water level is equal to or higher than the threshold value. That is, in this case, the water supply and drainage control unit 322 transmits a drainage request to the field management server 100, requesting that the drain plug 20 provided in the field FM in which the water level is equal to or higher than the threshold value be opened. As a result, the drain plug 20 in the field FM in which the water level is equal to or higher than the threshold value is opened, water is drained from the field FM, and the water level of the field FM drops. In this case, the opening degree of the plug portion of the drain plug 20 instructed may be fully open, or may be a predetermined opening degree smaller than fully open. In addition, the water supply and drainage control unit 322 controls the drain plug 20 to a closed state when the water level monitored for the field FM where water is being drained through the drain plug 20 in the manner described above falls below a predetermined level.

[0066] By carrying out the above-described control, when heavy rain is occurring, rainwater can be stored in the field FM while the water level can be adjusted so that it does not flow over the ridges. In this case, the water supply and drainage control unit 322 may open the water gate of the outflow gate GTD. Alternatively, the water supply and drainage control unit 322 may close the water gate of the outflow gate GTD if there is a sufficient amount of 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 suppression drainage control. The suppression drainage control is a control in which the rainwater stored in the field FM is gradually discharged 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, the amount of water flowing from the field FM through the drainage channel into the river RV is suppressed (limited) to a predetermined level or lower, thereby preventing the water level and amount of water in the river RV from increasing excessively.

[0068] Specifically, the water supply and drainage control unit 322 may, as suppressed drainage control, control the drain plug 20 so that drainage is performed sequentially into the drainage channel for each group of one or more fields FM divided into the field group. 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 drainage, and subsequently, or after waiting for a predetermined time, control the corresponding drain plug 20 so that drainage is performed in the next predetermined one or more fields FM. The lower threshold may be set in consideration of the transition to farming 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 degree of the drain plugs 20 as suppressed drainage control.

[0069] Step S111: When the suppression drainage control in step S110 ends, the water supply and drainage control unit 322 transmits 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 transmitted in step S103. In response to receiving the restriction lift request, the farm land management server 100 lifts the restriction on farm land management for normal times. After that, the farm land management server 100 controls the water faucet devices for farm land management for normal times.

[0070] In addition, when making a decision to control the water tap under the water level excess suppression control in step S109 or the suppression 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 level from exceeding 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) for reducing the amount of stored water in the field FM to a certain level or less before the heavy rain in steps S105 to S107 may be omitted. For example, if it is detected that the water level in the field FM is already at or below a 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 transmitted in step S104 to close the drain plug 20.

[0073] [Notification to farm owners] In this embodiment, when the control of the faucet devices for farming by the farmland management server 100 is restricted in response to the occurrence of heavy rain as described above and the irrigation channel management server 300 forcibly controls the faucet devices for rainwater storage, a notification is given to the farm owner. The manner in which the notification is given 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 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 devices 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, include a content notifying the owner of the field that heavy rain is predicted to occur within a predetermined time and therefore control of the faucet device for farming is no longer possible. Also, it may include a content notifying that, as a result of the prediction of heavy rain, the irrigation channel management server 300 (i.e., the irrigation manager) has first performed control to forcibly drain the irrigation water of the field FM as control of the faucet device for rainwater storage. When the control to forcibly drain the irrigation water of the field FM is completed over time, a notification to that effect may also be provided. The heavy rain warning may also include information such as the area in which heavy rain is expected to occur, the time period, and the amount of rainfall.

[0075] The farm land management server 100 may provide a pre-heavy rain warning with the above-mentioned contents on, for example, a top page of the farm land management system for farming that 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 contents to the farm land owner terminal 200 as a pre-heavy rain warning.

[0076] Furthermore, when the farm land management server 100 stops control of the farm-operated faucet device in response to the receipt of the farm land management restriction request, it may be configured to not accept a specific operation by the farm owner to the farm land management system. Specifically, it may be configured to not accept at least an operation to remotely control the faucet device in real time.

[0077] Furthermore, in response to determining that the state before the heavy rain has changed to a heavy rain state, 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 channel management server 300 or the farm owner terminal 200 based on current weather information. Alternatively, the irrigation channel management server 300 or the farm owner terminal 200 may make the determination based on the measurement results of the water volume of the river RV. Alternatively, the irrigation channel management server 300 may determine that a heavy rain state has occurred in response to the irrigation channel manager determining that heavy rain has occurred and performing an operation to confirm the occurrence of heavy rain in the irrigation channel management server 300.

[0078] The heavy rain notification may, for example, notify the farm owner that heavy rain is occurring, so control of the faucet devices for farming cannot continue until the heavy rain subsides, and that the faucet devices for rainwater storage are being controlled by the irrigation channel management server 300. The pre-heavy rain notification may also include information such as the current area of ​​heavy rain, the expected end time of the heavy rain, and the current amount of rainfall.

[0079] The farm land management server 100 may provide a heavy rain notification with the above-mentioned contents following the above-mentioned pre-heavy rain notification on the top page of the farm land management system. Alternatively, the farm land management server 100 may send an email containing the above-mentioned notification contents to the farm land owner terminal 200 as a heavy rain notification.

[0080] Furthermore, the farm land management server 100 may continue to disable acceptance of certain operations by the farm owner on the farm land 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 farm field 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 were previously 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 regarding the end of the heavy rain (heavy rain end notification).

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

[0083] The farm land management server 100 may issue the heavy rain end notification as described above on the top page of the farm land management system following the heavy rain notification described above. Alternatively, the farm land management server 100 may send the heavy rain end notification as an email containing the notification content as described above to the farm land owner terminal 200.

[0084] <Second embodiment> [overview] In the first embodiment described above, in the event of heavy rain in the area (relevant area) in which 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, when heavy rain occurs in an area (upstream or downstream area) corresponding to the basin of the river RV, the water level of the river RV will also rise in the corresponding area, but the amount of rainfall in the corresponding area is small. Therefore, even if the field FM in the corresponding area stores only rainwater without drawing water from the river RV, the rise in the water level of the river RV cannot be effectively suppressed. Therefore, in response to heavy rainfall occurring in the upstream or downstream area, the irrigation canal management server 300 of this embodiment proactively takes in water from the river RV and stores it in the field FM of the corresponding 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 corresponding area can be effectively suppressed.

[0085] [Example of processing procedure] An example of a process procedure executed by the irrigation channel 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 similar to 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 or downstream area within a predetermined time based on the meteorological 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 similar to steps S103 to S107 in Fig. 6. By the processing of steps S203 to S207, the water level of each farm field FM in the relevant region is reduced to a certain level or lower before the 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, heavy rain falls in the upstream or downstream area at a certain time due to a change in the weather. In this case, the water supply and drainage control unit 322 judges whether the state has changed from a state where water intake is not required to a state where water intake is required. The water intake 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 beyond an allowable limit. The water supply and drainage control unit 322 may determine that the field FM has transitioned to a water intake state when, for example, the degree of increase in rainfall as understood 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 a water intake state when, for example, the water level of the river RV in an upstream region or downstream region, or the water level of the river RV in the relevant region, reaches a certain level or higher.

[0089] Step S209: If it is determined in step S208 that the state has transitioned to one requiring water intake, the water supply and drainage control unit 322 transmits a water intake request to the farmland management server 100 in the corresponding area. In response to receiving the water intake request, the farm field management server 100 controls the farm field FM to enter a water intake state in which water from the river RV can be taken in. Specifically, when entering the water intake state, the farm field management server 100 controls the water gate of the water inlet gate GTS to be in an open state, and opens the faucet of the water supply tap 10 provided in the farm field FM in the corresponding 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 faucet 10 in the water intake state may be fully open or may be a predetermined opening degree 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 faucet 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 changed to one requiring water intake, or after the process 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 the amount of rainfall grasped 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 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 state requiring water intake has been resolved, the water supply and drainage control unit 322 transmits a water intake stop request to the farm land management server 100. In response to receiving the water intake stop request, the field management server 100 controls the 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 field FM. Specifically, the field management server 100 closes the tap of the water supply faucet 10 installed in the field FM in the relevant area. At this time, the field management server 100 may also control the water gate of the water inlet gate GTS to be closed. Alternatively, the field management server 100 may close the water gate of the water inlet gate GTS and open the tap of the water supply faucet 10 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 process of step S211, the processes of steps S212 and S213 are executed. The processes 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 process returns to step S208, so that a transition between the water intake requirement state and the water intake stop state can be made depending on the situation during the heavy rain.

[0093] The processes in steps S214 and S215 are similar to 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 drain line detected by the drain sensor (main drain sensor 60A, tributary drain 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 of the river RV may become muddy. For this reason, when water is taken from the river RV into the field FM in response to a case where the upstream or downstream area is in a state of heavy rain as in the second embodiment, muddy water may flow into the field FM. When taking water from the field FM into the river RV, there is an aspect that 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 those in Fig. 1 are given the same reference numerals and the description thereof 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 water 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 degree of the water supply valve 81 and the drain valve 82 is 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 flowing 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 a procedure similar to that shown in FIG. 7 for a group of farm fields. Then, when the water intake is required, the irrigation channel management server 300 of this modified example stores the water taken from the river RV in the storage tank 80. At this time, the irrigation channel 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 manner, 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 suppress the turbidity of the water stored in the field FM.

[0102] After the heavy rain subsides, the irrigation channel management server 300 may also perform restraint and drainage control on the water stored in the storage tank 80. In this case, the irrigation channel management server 300 may perform restraint and 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 addition, in the figure, an example is shown in which the upstream side of the tributary drainage channel BDR-21 is connected to the tributary supply channel BSP-1. By connecting the tributary drainage channel BDR-21 to the tributary supply channel BSP-1 in this way, the water flowing into the tributary supply channel BSP-1 flows not only to the storage tanks 80-1 and 80-2 but also to the tributary drainage channel BDR-21. As a result, even if the water in the storage tank 80 becomes full, for example, a part of the water flowing into the main supply channel MSP can be flowed into the main drainage channel MDR via the tributary supply channel BSP-1 and the tributary drainage channel BDR-21, so that water overflowing from the main supply channel MSP can be prevented.

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

[0105] [Second modified example] This modified example is a modified example of the aspect in which a storage tank is provided upstream of the farm field FM, as in the first modified example. 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 the description thereof 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 Fig. 9. That is, 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 a storage tank 80A from an upstream main supply channel MSP-U via a water supply valve 81. The water in the storage tank 80A can be discharged to a tributary drainage channel BDR-1 via a drainage valve 82-1, and can also be discharged to a 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 in the storage tank 80A under normal circumstances, or to supply water taken in from the river RV through the water inlet gate GTS to the downstream main supply canal MSP-D via a bypass route (not shown) without storing the water in the storage tank 80A. This enables the farm field management server 100 to supply irrigation water for farming under normal circumstances to the field FM. 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 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. 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 water faucet devices (water supply faucet 10, drain plug 20) were designed to adjust the flow rate from the water inlet to the water outlet by adjusting the opening of the plug. In addition, when the irrigation channel management server 300 controls the water faucet devices to set the water level in the field FM to a certain target value, the water level detected by a water level sensor provided in the field FM is monitored.

[0108] In this modification, 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 modification, the height of the upper opening of the water level adjustment pipe can be adjusted by control of the farm management server 100.

[0109] 10(A) shows an example of a farm field FM in which a water level adjustment pipe 70 is used as a drainage device. In this figure, the same parts as those in FIG. 1 and the like are given the same reference numerals, and the description 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 so as to move within a predetermined movable range in the vertical direction by the driving device 20A. The driving device 20A can drive the water level adjustment pipe 70 in response to, for example, manual operation. In addition, the driving device 20A can communicate with the irrigation channel management server 300, and can drive the water level adjustment pipe 70 in response to the control of the irrigation channel 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 so as 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 channel management are provided in the field FM. In this modification, 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. Also, the water supply tap 10 in the figure, like the previous embodiment, adjusts the amount of water taken in from the tributary supply channel BSP and supplied to the field FM.

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

[0111] In addition, 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 performing forced control of the faucet device (discharge of irrigation water from the field FM before heavy rain, control of storing rainwater and preventing water level from exceeding during heavy rain, control of suppressed drainage after heavy rain has subsided, etc.). For this purpose, the irrigation canal management server 300 controls the drive unit 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 compulsorily controlling the faucet device, it is necessary to monitor and adjust the water level including the range of water levels higher than the upper limit of the water level that can be detected by the farming water level sensor 30. Therefore, the irrigation canal management server 300 is configured to use the water level detected by the irrigation canal management sensor 40 when compulsorily controlling the faucet device.

[0113] [Fourth Variation] The upper limit of the water level adjustment range of the water level adjustment pipe 70 that adjusts the water level under the third modified example 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 described 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 ridge as an upper limit.

[0114] Fig. 11(A) shows an example of a farm field FM corresponding to this modified example. In this figure, the same parts as those in Fig. 10(A) and Fig. 10(B) are given the same reference numerals and the description thereof will be omitted as appropriate. In the farm field FM in the figure, an enclosing box BX is provided so as to cover the water level adjusting pipe 70. The enclosing box BX is provided so that the height of its upper surface is the same as the height h of the ridge RD. The enclosure BX has an open top and an opening OP on a side surface. The opening OP on the side surface is opened and closed by the gate G in response to the driving device 20B driving 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 from the side of the enclosing box BX through the opening OP. In this case, the upper limit of the water level of the field FM is determined according to the height of the upper end opening of the water level adjustment pipe 70. That is, in this case, the water level of the field FM is adjusted by adjusting the height of the upper end opening of the water level adjustment pipe 70. During farming, the water level of 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 performing compulsory control of the faucet device in response to the occurrence of heavy rain (discharge of irrigation water from the field FM before the heavy rain, rainwater storage and water level exceedance prevention control during the heavy rain, suppressed drainage control after the heavy rain has subsided, etc.), the irrigation channel 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 this case, the control of the drive unit 20B by the irrigation channel 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, and the water level rises. Then, when the water level reaches the top end of the enclosing box BX, the water stored in the field FM will flow into the enclosing box BX from the top end. Therefore, the water level of the field FM in this case is maintained at the height of the ridge RD corresponding to the top end of the enclosing box BX. In this manner, in this modified example, even if the upper limit water level to be stored in the field FM in response to the occurrence of heavy rain (upper limit 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 upper limit 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 the heavy rain occurs. This makes it possible to drain water from the field FM before the 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 drain plug 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 taps 10 and drain valves 20, and then controls the water supply taps and drain valves compatible with irrigation canal management when forcibly controlling the water tap devices (discharge of irrigation water from the field FM before heavy rain, control to prevent water level exceedance during heavy rain, suppressive drainage control after the heavy rain has subsided, etc.).

[0119] [Sixth Modification] The irrigation canal management server 300 and the farm land management server 100 may be integrated into one server. Alternatively, the functions of the irrigation canal management server 300 may be distributed among multiple servers. Also, the functions of the farm land management server 100 may be distributed among multiple servers.

[0120] In addition, a program for implementing the functions of the above-mentioned water tap device (water supply tap 10, drain tap 20), the farm management server 100, the irrigation channel management server 300, the farm owner terminal 200, etc. may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed to perform processing as the above-mentioned water tap device (water supply tap 10, drain tap 20), the farm management server 100, the irrigation channel management server 300, the farm owner terminal 200, etc. Here, "reading a program recorded on a recording medium into a computer system and executing it" includes installing the program into a computer system. The "computer system" here includes hardware such as an OS and peripheral devices. In addition, the "computer system" may include multiple computer devices connected via a network including communication lines such as the Internet, WAN, LAN, and dedicated lines. In addition, the "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into a computer system. In this way, the recording medium storing the program may be a non-transient recording medium such as a CD-ROM. The recording medium also includes a recording medium provided inside or outside the distribution server that can be accessed in order to distribute the program. The code of the program stored in the recording medium of the distribution server may be different from the code of the program in a format executable by the terminal device. In other words, the format in which the program is stored in the distribution server does not matter as long as it can be downloaded from the distribution server and installed in a format executable by the terminal device. Note that the program may be divided into multiple parts, downloaded at different times, and then combined in the terminal device, or each of the divided programs may be distributed by a different distribution server. Furthermore, the "computer-readable recording medium" includes a memory that holds the program for a certain period of time, such as a volatile memory (RAM) in a computer system that becomes a server or a client when the program is transmitted via a network. The above program may also be for realizing 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 tap, 20 drain plug, 30 water level sensor, 40 water level sensor, 50A main water supply sensor, 50B tributary water supply sensor, 60A main drain sensor, 60B tributary drain sensor, 80 (80-1, 80-2, 80A) storage tank, 100 farm field management server, 101 communication unit, 102 control unit, 103 memory unit, 131 farm field management information memory unit, 200 farm field 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 drainage device provided to drain water from the field; an irrigation channel management device that has a water supply and drainage control unit that performs heavy rain response control to control the opening and closing of the drainage device so that rainwater can be stored in the field in response to heavy rain, after instructing a farm field management device that performs farming response control to limit farming response control including at least one of control of opening and closing of the drainage device according to a farming schedule and control of opening and closing of the drainage device in response to remote control from a farm owner terminal, and that manages the flow of irrigation water flowing in an irrigation channel connected to the drainage device; A field water management system comprising:

2. a storage necessity determination unit that determines whether or not it is necessary to store water in the field, The storage necessity determination unit determines whether or not it is necessary to store water in the field based on meteorological information. The field water management system according to claim 1.

3. The water supply and drainage control unit, in response to a determination made by the storage necessity determination unit that it is no longer necessary to store water in the field after the determination that it is necessary to store water in the field, controls the discharge of water by the drainage device so that an amount of water discharged into a drainage channel is limited to a predetermined level or less when the water stored in the field is brought to a predetermined water level. The field water management system according to claim 2.

4. The water supply and drainage control unit is In the heavy rain response control, a control is performed in which the drainage device is opened to drain water until the water level in the field becomes equal to or lower than a predetermined level so that water can be stored in the field, and a control is performed in which the drainage device is closed after the control in which the water is drained. The field water management system according to any one of claims 1 to 3.

5. A field water management method in a field water management system including a drainage device that drains water from a field and an irrigation channel management device that manages the flow of irrigation water flowing in an irrigation channel connected to the drainage device, comprising: A drainage control step in which a water supply and drainage control unit in the irrigation channel management device instructs a farm management device that performs farming response control to limit farming response control including at least one of control of opening and closing of the drainage device according to a farming schedule and control of opening and closing of the drainage device in response to remote control from a farm owner terminal, and then performs heavy rain response control to control opening and closing of the drainage device so that rainwater can be stored in the field in response to the occurrence of heavy rain. A field water management method comprising the steps of:

6. A farm field water management system includes a drainage device that drains water from a farm field and an irrigation channel management device that manages the flow of irrigation water flowing in an irrigation channel connected to the drainage device, the irrigation channel management device being a computer, A water supply and drainage control unit that performs heavy rain response control by instructing a farm management device that performs farming response control to limit farming response control including at least one of control of opening and closing of the drainage device according to a farming schedule and control of opening and closing of the drainage device in response to remote control from a farm owner terminal, and then controlling the opening and closing of the drainage device so that rainwater can be stored in the farm field in response to the occurrence of heavy rain. A program to function as a

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