JP2022157722A - Farm field water management system, farm field water management method, and program - Google Patents

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

The present invention relates to an agricultural field water management system, an agricultural field water management method, and a program.

A drainage adjustment unit was installed for the drainage pipe installed in the paddy field, and by operating the drainage adjustment unit to adjust the drainage amount when there was a lot of rainfall, the amount of drainage from the paddy field to the public drainage channel was controlled. A rice paddy dam system is known (see Patent Document 1, for example).

Japanese Patent No. 6496230

The rice paddy dam described in Patent Literature 1 adjusts the amount of drainage by manual work of operating the handle of the drainage amount adjustment unit. From the viewpoint of work efficiency, safety, etc., it is preferable that the operation of a drainage device for storing water in agricultural fields such as paddy fields is appropriately controlled according to weather conditions such as heavy rain.

SUMMARY OF THE INVENTION It is an object of the present invention to appropriately control the operation of a drainage device for storing water in agricultural fields such as paddy fields according to weather conditions. .

One aspect of the present invention for solving the above-described problems is a drainage device provided to drain water from a field, and after limiting control of the drainage device performed in response to farming, and a drainage control unit that controls the drainage device so that water can be stored.

One aspect of the present invention is an agricultural field water management method in an agricultural field water management system provided with a drainage device for discharging water from a field, wherein after limiting control of the drainage device performed corresponding to farming, and a drainage control step of controlling the drainage device so that water can be stored in the field.

According to one aspect of the present invention, a computer in an agricultural field water management system provided with a drainage device for discharging water from a field is controlled to limit control of the drainage device performed in response to farming, and water is stored in the agricultural field. It is a program for functioning as a drainage control section that controls the drainage device so as to be in a possible state.

ADVANTAGE OF THE INVENTION According to this invention, the effect that it comes to be appropriately controlled about the operation|movement of the drainage device for making agricultural fields, such as a paddy field, retain water according to a weather condition is acquired.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structural example of the water management system which concerns on 1st Embodiment. It is a figure showing an example of functional composition of an agricultural field management server concerning a 1st embodiment. It is a figure which shows an example of the agricultural field management information which concerns on 1st Embodiment. It is a figure which shows the functional structural example of the canal management server which concerns on 1st Embodiment. It is a figure which shows an example of irrigation channel information, branch water supply channel information, branch drainage channel information, and water level sensor information which concern on 1st Embodiment. 6 is a flow chart showing an example of a processing procedure executed in relation to rainwater storage by the canal management server according to the first embodiment; It is a flowchart which shows the example of a processing procedure which the canal management server which concerns on 2nd Embodiment performs in relation to rainwater storage. It is a figure showing the whole example of composition of the water management system concerning the 1st modification of this embodiment. It is a figure showing the whole example of composition of the water management system concerning the 2nd modification of this embodiment. It is a figure which shows the example of one aspect|mode of the agricultural field based on the 3rd modification of this embodiment. It is a figure which shows the example of one aspect|mode of the agricultural field based on the 4th modification of this embodiment.

Hereinafter, a water management system according to one embodiment of the present invention will be described with reference to the drawings.
<First Embodiment>
[Overall configuration example of water management system]
FIG. 1 shows an overall configuration example of a water management system in this embodiment. The irrigation water management system of the present embodiment performs 'farm field management (farming management)' and 'irrigation channel management' as 'irrigation water management'. Farm field management is management of a farm field performed by a farm owner (a farmer) for farming, and includes water supply and drainage in a farm field for farming.
Irrigation channel management is management that is higher than farm field management, and manages the flow of irrigation water in irrigation channels provided corresponding to a group of farm fields. The irrigation channel management is performed by the irrigation channel manager who operates the irrigation channel management server 300 .
In correspondence with the figure, the irrigation canals subject to irrigation management are the main water supply channel MSP, tributary water supply channel BSP (BSP-1, BSP-2), tributary drainage channel BDR (BDR-11, BDR-12, BDR- 21, BDR-22), and the Main Drainage MDR.

A field water supply and drainage system to which the water management system corresponds will be described with reference to FIG. The figure shows an example in which the water management system manages a first field group of fields FM-11 to FM-16 and a second field group of fields FM-21 to FM-26.
Fields FM-11 to FM-16 and FM-21 to FM-26 in the figure are paddy fields, for example, and irrigation and drainage (water supply and drainage) are performed so that the water level is appropriate according to the rice cultivation season.
In the following description, fields FM-11 to FM-16 and fields FM-21 to FM-26 are referred to as field FM unless otherwise distinguished. The number of farm fields FM and farm fields to be managed by the water management system of the present embodiment is not particularly limited.

The agricultural field FM is supplied with water drawn from the river RV as follows.
A water entry gate GTS is provided for the river RV. The water entry gate GTS comprises, for example, a floodgate and a pump.
A water gate ID (identifier) is assigned to the water gate GTS. The irrigation channel management server 300 controls the opening and closing of the sluice gate and the drive of the pump at the water inlet gate GTS via the network NW, thereby adjusting the amount of irrigation water flowing to the mainstream water supply channel MSP.

The service water flowing through the main water supply channel MSP is branched to the branch water supply channels BSP (BSP-1, BSP-2).
The tributary water supply channel BSP-1 is arranged so as to penetrate the first field group. Each of the fields FM in the first field group is provided with a predetermined number of water taps 10 (an example of a water supply device) corresponding to the tributary water supply channel BSP-1. The water tap 10 adjusts the amount of service water supplied from the water inlet and discharged from the outlet according to the degree of opening of a plug (valve) provided in a flow path between the water inlet and the water outlet.
The water tap 10 provided in the field FM of the first field group supplies water to the corresponding field FM by discharging the water supplied from the branch water supply channel BSP-1 to the field FM.
The water tap 10 provided in the field FM of the second field group supplies water to the corresponding field FM by discharging the water supplied from the branch water supply channel BSP-2.

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

Further, in the first field group, a tributary drainage channel BDR-11 is arranged on the opposite bank side of the tributary water supply channel BSP-1 of the fields FM-11 to FM-13. Each field FM in the first field group is provided with a predetermined number of drain plugs 20 (an example of a drainage device) corresponding to the tributary drainage channel BDR-11. The drain plug 20 adjusts the amount of water supplied from the water inlet and discharged from the outlet according to the degree of opening of a plug (valve) provided in the channel between the inlet and the outlet.
The drain plug 20 discharges the water stored in the corresponding field FM to the tributary drain BDR-11.
Further, in the first field group, a tributary drainage channel BDR-12 is arranged on the opposite bank side of the tributary water supply channel BSP-1 of the fields FM-14 to FM-16. Each of the fields FM in the second field group is provided with a predetermined number of drain plugs 20 corresponding to the tributary drainage channel BDR-12. The drain plug 20 discharges the water stored in the corresponding field FM to the tributary drain BDR-12.

Further, in the second field group, a tributary drainage channel BDR-21 is arranged on the opposite bank side of the tributary water supply channel BSP-2 of the fields FM-21 to FM-23. Each of the fields FM in the second field group is provided with a predetermined number of drain plugs 20 corresponding to the tributary drainage channel BDR-21. The drain plug 20 discharges the water stored in the corresponding field FM to the tributary drain BDR-21.
Further, in the first field group, a tributary drainage channel BDR-22 is arranged on the opposite bank side of the tributary water supply channel BSP-2 of the fields FM-24 to FM-26. Each of the fields FM in the second field group is provided with a predetermined number of drain plugs 20 corresponding to the tributary drainage channel BDR-22. The drain plug 20 discharges the water stored in the corresponding field FM to the tributary drain BDR-22.

As described above, a drain plug ID is assigned to the drain plug 20 provided in the field FM. The drain plug 20 adjusts the amount of irrigation water discharged from the farm field FM by changing the degree of opening according to the control of the farm field management server 100 via the network NW.

The water discharged to the tributary drainage channels BDR-11, BDR-12, BDR-21 and BDR-22 flows into the main drainage channel MDR. The water that has flowed into the main drainage channel MDR is discharged from the outflow gate GTD into the river RV. In this example, the outflow gate GTD is provided on the downstream side of the inflow gate GTS.
The water gate GTD comprises, for example, a water gate and a pump. A water gate ID is assigned to the water gate GTD. The irrigation channel management server 300 can adjust the amount of irrigation water to be discharged to the river RV by controlling the opening and closing of the water gate and the driving of the pump at the water discharge gate GTD via the network NW.

A mainstream water supply sensor 50A is provided upstream of the branch water supply paths BSP-1 and BSP-2 in the mainstream water supply path MSP. The mainstream water supply sensor 50A detects the flow rate of service water in the mainstream water supply path MSP. A sensor ID is given to the mainstream water supply sensor 50A. The mainstream water supply sensor 50A transmits the detected flow rate to the irrigation channel management server 300 via the network NW.

In addition, the tributary water supply paths BSP (BSP-1, BSP-2) are each provided with a tributary water supply sensor 50B. The tributary water supply sensor 50B detects the flow rate of service water in the corresponding tributary water supply path 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.

Further, each of the tributary drainage channels BDR (BDR-11, BDR-12, BDR-21, BDR-22) is provided with a tributary drainage sensor 60B. The tributary drainage sensor 60B detects the flow rate of 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 canal management server 300 via the network NW.

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 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.

In addition, each field FM is provided with a water level sensor 30 for farming. 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 agricultural field management server 100 via the network NW. In addition, the water level sensor 30 may transmit the detected water level to the agricultural field management server 100 using the communication function of the water tap 10 or the drain tap 20 . In this case, the water level sensor 30 transmits the detected water level to the water tap 10 or the drain cock 20 by wireless communication or wired communication.

In addition, each field FM is provided with a water level sensor 40 for irrigation channel 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 canal management server 300 via the network NW.

The irrigation channel management server 300 may acquire the water level detected by the water level sensor 30 for farming via the agricultural field management server 100 . In this case, the water level sensor 40 for irrigation channel management may be saved.

The farm field management server 100 is a server operated by a farm manager who has contracted a farm field management service with the farm owner of the farm field FM. The agricultural field management server 100 can communicate with the agricultural field main terminal 200, the faucet device (water faucet 10, drain faucet 20), the water level sensor 30 for farming, and the like via the network NW.
The farm field management server 100 controls the opening and closing of the faucet device according to the farming schedule set by the farmer, thereby maintaining the water level in the farming field FM according to the farming schedule.
The farming schedule can be set by, for example, operating a farming schedule setting screen displayed when the farmer makes the farmer's terminal 200 access the farmer's management server 100 .
In addition, the field owner can operate the field master terminal 200, for example, specify the faucet device and specify the degree of opening, thereby remotely controlling the opening degree of the faucet device in real time. can. Moreover, the farm field owner can also adjust the degree of opening of the faucet device by going to the farm field FM and operating the faucet device itself.

The agricultural field main terminal 200 may be, for example, a personal computer, a tablet terminal, a smart phone, or the like. These information processing devices as the farm field main terminal 200 can access the farm field management server 100 using a web browser or a farm field management application.

The irrigation channel management server 300 is a server operated by a irrigation channel manager, and manages supply and drainage of irrigation water to the farm field FM at a higher level than the farm field management server 100 . The irrigation channel management server 300 includes an inflow gate GTS, an outflow gate GTD, sensors provided in the irrigation channel (main stream water supply sensor 50A, tributary water supply sensor 50B, tributary drainage sensor 60B, mainstream drainage sensor 60A), water level sensor 40 of each field FM), and They are communicably connected via the network NW.

In normal times, the irrigation channel management server 300 adjusts the amount of water to be supplied and drained in the field groups (the first field group and the second field group) according to, for example, a predetermined rule. The irrigation channel management server 300 performs control to appropriately change the opening degrees of the irrigation gate GTS and the irrigation gate GTD when adjusting the amount of water supplied and discharged in the field group.

The irrigation channel management server 300 acquires weather information via the network NW, and determines whether or not it is necessary to temporarily store rainwater (rainwater storage) in the field FM based on the acquired weather information. .
Specifically, the irrigation channel management server 300, based on the weather information, for example, when it is predicted that the rainfall amount (heavy rain) will be greater than or equal to a predetermined amount after a predetermined period of time, the irrigation channel management server 300, corresponding to the time zone of heavy rain, It is determined that it is necessary to store rainwater in the FM without discharging it (rainwater storage).
When it is determined that rainwater storage is necessary, the irrigation channel management server 300 controls the water faucet device for storing rainwater prior to the control of the water faucet device for farming by the agricultural field management server 100 . A specific example of the control of the faucet device for rainwater storage executed by the irrigation channel management server 300 will be described later.
Whether or not it is necessary to store rainwater may be determined by the water manager based on various information. Information from the sensors provided in the irrigation canals, the water level sensors 40 of each field FM, etc. may be integrated and presented to the irrigation manager through a display or the like to prompt him/her to determine whether or not it is necessary to store rainwater.

[Configuration example of field management server]
A functional configuration example of the agricultural field management server 100 will be described with reference to FIG. The functions of the agricultural field management server 100 shown in the figure are realized by executing a program by a CPU (Central Processing Unit) included in the agricultural field management server 100 . The agricultural field management server 100 includes a communication section 101 , a control section 102 and a storage section 103 .
A communication unit 101 performs communication via a network.

The control unit 102 executes control in the agricultural field management server 100 . The control unit 102 controls the operation of the faucet device (the water faucet 10 and the drain faucet 20) corresponding to farming. For example, the control unit 102 can control the opening and closing of the water faucet device via the network NW so that the water level becomes the water level for each period or time period determined in the farming schedule set by the farm owner. In addition, the control unit 102 can control operations such as opening and closing of the faucet device according to commands transmitted from the agricultural field main terminal 200 by the operation of the agricultural field main terminal 200 by the agricultural field owner.
In addition, the control unit 102 can perform various notifications to the agricultural field main terminal 200 .

The storage unit 103 stores various information related to the agricultural field management server 100 . The storage unit 103 in the figure includes a field management information storage unit 131 .
The agricultural field management information storage unit 131 stores agricultural field management information. The farm field management information is management information for each farm field FM.

FIG. 3 shows an example of agricultural field management information stored in the agricultural field management information storage unit 131. As shown in FIG. One row (one record) in the figure is farm field management information corresponding to one farm field.
The farm field management information corresponding to one farm field includes a farm field ID, hydrant ID, drain plug ID, farming water level sensor ID, farm land master information, farm land master terminal information, and a farming schedule area.
The field ID field stores the field ID assigned to the corresponding field FM.
The water tap ID area stores the water tap ID for each water tap 10 provided in the corresponding field FM.
The drain plug ID area stores the water plug ID for each drain plug 20 provided in the corresponding field FM.
The farming water level sensor ID stores the sensor ID of the farming water level sensor 30 provided in the corresponding farm field FM.
The field owner information area stores information (field owner information) about the corresponding farm owner. The farm land owner information includes a farm land owner ID assigned to the corresponding farm land owner.
The field master terminal information area stores information (field master terminal information) on the farm field master terminal 200 owned by the corresponding farm field master. The farm field main terminal information includes the farm field main terminal ID assigned to the corresponding farm field main terminal 200 .
The farming schedule field stores the farming schedule set for the corresponding farm field FM. The farm management schedule can be set by the farm owner operating the farm farm terminal 200 . In the farming schedule, the water level required for farming in the corresponding field FM is set in units of month, week, day, or the like.

[Configuration example of irrigation canal management server]
A functional configuration example of the irrigation channel management server 300 will be described with reference to FIG. The functions of the irrigation channel management server 300 shown in FIG. The canal management server 300 includes a communication section 301 , a control section 302 and a storage section 303 .
A communication unit 301 performs communication via a network.

The control unit 302 executes control in the canal management server 300 . The controller 302 includes a water supply/drainage controller 322 .
The water supply/drainage controller 322 adjusts the flow of water in the water channel. That is, the water supply/drainage control unit 322 controls the opening degrees of the water inlet gate GTS and the water outlet gate GTD, thereby controlling the amount of water to be flowed (supplied) from the river RV to the mainstream water supply channel MSP and the amount of water to be supplied from the river RV to the river RV. Adjust the amount of water to be discharged (drained) to the
Also, the water supply/drainage control unit 322 determines whether or not rainwater storage is necessary based on the weather information. When determining that rainwater storage is necessary, the water supply/drainage control unit 322 controls the water faucet device for storing rainwater, prior to the control of the water faucet device for farming by the agricultural field management server 100 .

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

The irrigation channel information storage unit 331 stores irrigation channel information. The irrigation channel information is information for managing irrigation channels in units of channels (main stream water channel MSP, mainstream drainage channel MDR, tributary water channel BSP, tributary drainage channel BDR).

The tributary water supply channel information storage unit 332 stores tributary water supply channel information. The tributary water supply channel information is information for managing the water tap 10 and the tributary water supply sensor 50B provided corresponding to each tributary water supply channel BSP.

The tributary drainage channel information storage unit 333 stores tributary drainage channel information. The tributary drainage channel information is information for managing the drain plug 20 and the tributary drainage sensor 60B provided corresponding to each tributary drainage channel BDR.

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 irrigation channel management provided in the field FM of the corresponding area.

FIG. 5A shows an example of irrigation channel information stored in the irrigation channel information storage unit 331 . The irrigation channel information in the figure corresponds to the irrigation channel arranged corresponding to the area including the first field group and the second field group in FIG.
The irrigation channel information in the figure includes areas of river ID, area information, main water supply channel ID, main water supply sensor ID, main drainage channel ID, main drainage sensor ID, tributary water supply channel ID, and tributary drainage channel ID.
The river ID area stores the river ID assigned to the river RV that serves as the supply source and discharge destination of water.
The area information area stores information (area information) about the corresponding area. The area information includes information (for example, latitude/longitude, address, etc.) indicating where the corresponding area exists.
The main water supply channel ID field stores the main water supply channel ID assigned to the main water supply channel MSP in the corresponding area.
The mainstream water supply sensor ID field stores the mainstream water supply sensor ID indicating the mainstream water supply sensor 50A arranged in the mainstream water supply path MSP.
The mainstream drainage channel ID field stores the mainstream drainage channel ID given to the mainstream drainage channel MDR in the corresponding area.
The field of 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 water supply channel ID field stores a tributary water supply channel ID assigned to each tributary water supply channel BSP provided corresponding to the corresponding main water 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 corresponding to the corresponding main water supply channel MSP and main drainage channel MDR.

FIG. 5B is an example of tributary water supply channel information stored in the tributary water supply channel information storage unit 332 . One record in the figure is branch water supply channel information corresponding to one branch water supply channel BSP. The water supply channel information corresponding to one tributary water supply channel BSP includes areas of a tributary water channel ID, a field ID, a hydrant 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 channel BSP.
The water tap ID area stores the water tap ID for each water tap 10 provided 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 path BSP.

FIG. 5C is an example of tributary drainage channel information stored in the tributary drainage channel information storage unit 333 . One record in the figure is branch drainage channel information corresponding to one branch drainage channel BDR. Drainage channel information corresponding to one tributary drainage channel BDR includes areas of 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 given 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 area stores the drain plug ID for each drain plug 20 provided to drain water from the corresponding tributary drain BDR to the field FM.
The field of the tributary drainage sensor ID stores the sensor ID of the tributary drainage sensor 60B provided in the corresponding tributary drainage channel BDR.

FIG. 5D shows an example of water level sensor information stored in the water level sensor information storage unit 334. As shown in FIG. The water level sensor information in the figure has a structure in which a water level sensor ID for irrigation channel management is stored in association with each field ID. That is, the water level sensor information is information indicating the water level sensor 40 for irrigation channel management provided for each field FM.

[About rainwater storage]
In the water management system of this embodiment, the waterway management server 300 in normal times controls the opening of the water gates GTS and GTD according to a water allocation schedule determined for normal times, for example. As a result, the irrigation channel management server 300 supplies irrigation water to the field FM according to the irrigation water allocation schedule, or stops the supply of irrigation water.

In addition, the agricultural field management server 100 in normal times controls the opening of the faucet device in accordance with the set farming schedule and the remote operation from the agricultural field main terminal 200, so that the water supply and drainage in the agricultural field FM for farming are controlled. let it happen.
In addition, the irrigation channel management server 300 in normal times prioritizes the control of the faucet device for farming by the agricultural field management server 100 . In this case, the irrigation channel management server 300 does not particularly control the faucet device.

Here, when heavy rainfall occurs in the area corresponding to the location of the farm field FM, the water level of the river RV rises. The relevant area here may be either a certain area including the farm field FM or a certain area upstream of the river RV to which the farm field FM corresponds.
In a situation where heavy rain has occurred in the relevant area, if the rain that has fallen on the farm field FM is being drained by the drain plug 20, the rainwater drained from the farm field FM will flow from the tributary drainage channel BDR to the main drainage channel. It flows into the river RV from the outflow gate GTD via the MDR. When rainwater flows into the river RV from the farm field FM in this way, the water level of the river RV rises further, and there is a possibility that the river RV will overflow.

Note that when the water gate GTD is closed, the rainwater in the field FM does not flow into the river RV. However, in this case, there is also a problem that the rainwater discharged from the farm field FM by the drain plug 20 accumulates in the drainage channel (tributary drainage channel BDR, main drainage channel MDR) and overflows.

Therefore, the water management system of the present embodiment stores rainwater in response to heavy rainfall in the area. In other words, the water management system stores rainwater in the field FM instead of draining it when it rains heavily in the area. By storing rainwater in the field FM in response to heavy rain in this way, the water level information of the river RV is suppressed. In addition, it is possible to prevent rainwater from overflowing from the drainage channel.
In the water management system of this embodiment, rainwater storage is performed under the authority of the waterway manager. Field management is limited when rainwater harvesting is used. Therefore, the control of rainwater storage is led by the irrigation channel management server 300, and the agricultural field management server 100 functions to relay the control of the faucet device by the irrigation channel management server 300. FIG.

[Example of processing procedure]
An example of a processing procedure executed by the irrigation channel management server 300 in relation to rainwater storage will be described with reference to the flowchart of FIG. 6 .

Step S101: In the irrigation canal management server 300, the retention necessity determination unit 321 acquires weather information of the area corresponding to the farm field group at a predetermined timing. It should be noted that the weather information does not necessarily have to be acquired, and instead, the water level of the farm field FM may be acquired from the farm field management server 100 in order to grasp the actual state of the water level of the farm field.
The storage necessity determination unit 321 may be configured to acquire weather information of the corresponding area corresponding to the field group, for example, triggered by the passage of a certain period of time or the instruction by the irrigation channel. The storage necessity determination unit 321 may acquire weather information by accessing a weather information server that provides weather information via the network NW.

Step S102: Based on the weather information acquired in step S101, the storage necessity determination unit 321 determines whether or not it is predicted that heavy rain will occur in the area after a predetermined period of time. Determination of whether or not the occurrence of heavy rain is predicted in step S102 corresponds to determination of whether or not it is necessary to store water in the field FM (rainwater storage) in response to the occurrence of heavy rain.
If it is not predicted that heavy rain will occur, the process in the figure may be terminated.
Note that the storage necessity determination unit 321 determines that, for example, when the irrigation channel manager has broken the irrigation channel because rainwater storage is required, the operation of instructing the activation of forced control of a faucet device for rainwater storage, etc. It may be determined that rainwater storage is necessary according to an input interface connected to the management server 300 or a terminal communicably connected to the canal management server 300 .

Step S103: When it is predicted in step S102 that heavy rain will occur after a predetermined period of time, the water supply/drainage control unit 322 instructs the farm management server 100, which manages the farm field FM (field group) in the relevant area, to limit farm management. Submit your request. The farm management server 100 that has received the farm management restriction request limits the farm management corresponding to the normal time.
Specifically, the farm field management server 100 forcibly executes control of the faucet device according to the farming schedule and control of the faucet device according to remote control from the farm field main terminal 200, which is performed in normal times. Stop. Also, instead of stopping control of the faucet device according to remote control from the field main terminal 200, control of the faucet device for storing rainwater by the irrigation channel management server 300 in S104 and S015, which will be described later, is preferentially executed. It's okay. Furthermore, the agricultural field management server 100 may control the faucet device such that the adjustment of the opening degree by manual operation of the faucet device itself is also impossible as a forced stop of the agricultural field management.

By executing step S103, control of the faucet device corresponding to farming by the agricultural field management server 100 is no longer performed, and control of the faucet device for storing rainwater by the irrigation channel management server 300 becomes possible. From then on, the agricultural field management server 100 relays communication for controlling the faucet device for rainwater storage by the irrigation channel management server 300 .

Step S<b>104 : As a rainwater storage procedure, the water supply/drainage control unit 322 first transmits a water supply stop request to the agricultural field 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 agricultural field management server 100 forcibly closes all the water taps 10 in the area. As a result, the water supply to the field FM is stopped.
The water supply/drainage control unit 322 transmits the closing request in step S104, and also performs control to close the water inlet gate GTS to stop the inflow of water from the river RV to the water supply channel. good.

Step S105: In addition, the water supply/drainage control unit 322 transmits a water supply stop request in step S104 as well as a drainage request to the agricultural field management server 100 . The drain request is a command requesting that all the drain plugs 20 in the area are forcibly fully opened and drained. In response to the transmission of the drainage request, the agricultural field management server 100 controls all of the drainage plugs 20 in the corresponding area to be fully opened.

Due to the control in steps S104 and S105, in the farm field FM of the relevant area, water is drained without being supplied with water, so the water level is lowered. In other words, the water supply/drainage control unit 322 forcibly lowers the water level in the farm field FM in the area before the heavy rain hits by the control in steps S104 and S105. This makes it possible to increase the amount of rainwater that can be stored in the farm field FM when it rains heavily.
If the water tap 10 or the drain tap 20 that is not in use is stopped, an unexpected accident may occur. Those that are not registered, those whose current position information is not the position of a pre-registered predetermined field, and those that are abnormally stopped may be excluded from forced control.
For example, if the water tap 10 or the drain tap 20 that is not in use has been moved to a certain place, it will be out of the communication range of the gateway provided in the field so as to intervene in the communication path with the irrigation canal management server 300. It may be off. In this way, the faucet 10 and the drain faucet 20 that are out of the communication range of the gateway may be excluded from forced control.

Step S106: After the processing of steps S104 and S105, the water supply/drainage control unit 322 acquires the water level detected by the water level sensor 40 provided in the farm field FM in the relevant area through communication with the water level sensor 40. The water supply/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 the predetermined lower limit water level.
Step S107: When the water supply/drainage control unit 322 performs the drainage stop control for a certain field FM in the relevant area in step S106, whether or not the drainage stop control for all the farm fields FM in the relevant area is completed at this stage. determine whether or not
If it is determined that the drainage stop control for all fields FM has not been completed, the process returns to step S106.

At the stage where the processing up to step S107 is finished, all the farm fields FM in the relevant area are set to the lower water level and all the water taps 10 and the drain taps 20 are closed. As a result, the farm field FM is in a state in which it is possible to store rainwater in an amount corresponding to the scale of the farm field FM without inflow of water from the water supply channel.
It should be noted that heavy rain may occur before the drainage stop control for all fields FM is completed. In this case, at the timing when the water supply/drainage control unit 322 determines that it is in a state of heavy rain, even in the field FM for which the drainage stop control has not yet been completed, the drain plug 20 is forcibly closed. You can

It should be noted that instead of the processing of steps S106 and S107, the water supply/drainage control unit 322 waits until a predetermined time elapses after a drainage request is transmitted in step S105 to start drainage in each field FM, and waits for a predetermined time. Depending on the lapse of time, the drain plug 20 of each field FM may be controlled to be closed.

Step S108: After the rainwater can be stored as described above, rainwater will be stored in the farm field FM when heavy rainfall occurs for a certain period of time. Therefore, the storage necessity determination unit 321 acquires weather information at regular time intervals after the processing of steps S106 and S107, for example, and determines the weather at that time based on the acquired weather information. After that, the storage necessity determination unit 321 determines whether or not the heavy rain has subsided after determining that the heavy rain has occurred. The storage necessity determination unit 321 determines whether or not the heavy rain has subsided, for example, by determining whether or not the rainfall amount based on the weather information has remained below a certain level for a certain period of time. good.
Determining whether the heavy rain has subsided corresponds to determining whether rainwater storage is no longer necessary.

Step S109: When the amount of rainwater stored in the field FM becomes excessive, rainwater flows out from the field FM over the ridge. For example, considering the conservation of ridges, it is preferable to avoid the situation in which rainwater flows 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/drainage control unit 322 executes excessive water level suppression control. The excessive water level deterrence control is to control the water level of the field FM so as not to exceed the upper limit water level (upper limit water level for storage) set in response to heavy rain. The upper limit water level for storage may be set to be higher than the upper limit water level determined for farming (upper limit water level for farming) and lower than the height of the ridge.
The upper limit water level corresponding to storage may be set by the farm owner or the farm manager.

As excess water level suppression control, the water supply/drainage control unit 322 monitors the water level detected by the water level sensor 40 for each field FM, and the monitored water level becomes equal to or higher than the threshold value set corresponding to the upper limit water level for storage. It is determined whether or not there is an agricultural field FM. When it is determined that there is a field FM whose water level is equal to or higher than the threshold, the water supply/drainage control unit 322 executes control to open the drain plug 20 in the field FM whose water level is equal to or higher than the threshold. In other words, the water supply/drainage control unit 322 in this case transmits to the farm field management server 100 a drainage request to specify and open the drain plug 20 provided in the field FM where the water level is equal to or higher than the threshold. As a result, the drain plug 20 in the field FM whose water level has reached the threshold value or more is opened, water is drained from the field FM, and the water level in the field FM is lowered. The degree of opening of the plug portion of the drain plug 20 indicated in this case may be fully open or may be a predetermined degree of opening smaller than full opening.
In addition, the water supply/drainage control unit 322 closes the drain plug 20 in response to the water level being monitored for the farm field FM, which drains the drain plug 20 as described above, falling below a predetermined level. control to

By performing the control as described above, it is possible to store rainwater in the farm field FM and adjust the water level so that it does not flow over the ridge under the condition of heavy rain.
In this case, the water supply/drainage controller 322 may open the water gate GTD. Alternatively, the water supply/drainage control unit 322 may close the water gate GTD if there is a sufficient amount of water in the drainage channel.

Step S110: When it is determined in step S108 that the torrential rain has subsided, the water supply/drainage control unit 322 executes suppression/drainage control.
Suppression drainage control is, for example, control for gradually discharging rainwater stored in the field FM to the river RV at predetermined time intervals or while monitoring the water level. Even after the heavy rain itself subsides, a considerable amount of water continues to flow in the river RV for a certain amount of time. The amount of water flowing into the river RV from the field FM through the drainage canal is suppressed (restricted) to a predetermined level or less by discharging the rainwater stored in the field FM into the river RV step by step instead of discharging it all at once. , the water level of the river RV, and an excessive increase in the amount of water is avoided.

Specifically, the water supply/drainage control unit 322 may control the drain plugs 20 so as to sequentially drain water into the drainage channel for each group of one or more farm field FMs divided in the farm field group as the suppression drainage control. . In this case, the water supply/drainage control unit 322 stops the drainage when it is determined that the water level of the farm field FM in which the water is being drained has fallen to a predetermined lower limit threshold, and continues or after waiting for a predetermined time. A corresponding drain plug 20 may be controlled so that drainage is performed in one or more next predetermined farm fields FM. Also, the above lower limit threshold may be set in consideration of the subsequent shift to farming.
Further, the water supply/drainage control unit 322 may limit the amount of water to be drained from all the farm fields FM in the farm field group by adjusting the opening degree of the plug portion of the drain plug 20 as the suppression drainage control.

Step S<b>111 : When the suppression drainage control in step S<b>110 ends, the water supply/drainage control unit 322 transmits a restriction release request to the canal management server 300 . The restriction release request is a command for requesting release of the restriction on farm management for normal times set by the farm management server 100 in response to the farm management restriction request transmitted in step S103.
The agricultural field management server 100 cancels the restriction of the agricultural field management corresponding to the normal time in response to receiving the restriction cancellation request. Thereafter, the agricultural field management server 100 controls the faucet device for agricultural field management corresponding to normal farming.

It should be noted that, in the judgment for controlling the water tap under the excessive water level suppression control in step S109 and the suppression drainage control in step S110, the water discharge sensor (main stream water discharge sensor 60A, tributary water discharge sensor 60B, 60B) detects Drain flow rate may be used.

Note that the irrigation channel management server 300 performs forced control of the faucet device after the occurrence of heavy rain is predicted in step S102 (discharge of irrigation water from the field FM before heavy rain, control to prevent excess water level during heavy rain, The storage unit 103 may be caused to store a history of subsequent water suppression control, etc.).

Note that the control (preliminary drainage control) for reducing the amount of water stored in the field FM in advance to a certain level or less in the stage before the heavy rain by steps S105 to S107 may be omitted. For example, when it is detected that the water level of the field FM is already the lower limit water level or a predetermined water level close to the lower limit water level or lower, the pre-drainage control may not be performed. In this case, the drain plug 20 may also be closed by transmitting the drain stop control in step S104.

[Notification to farm owner]
In the present embodiment, in response to the occurrence of heavy rain as described above, control of the faucet device for farming by the agricultural field management server 100 is limited, and the irrigation channel management server 300 is forced to store the faucet device for rainwater storage. When the control of is performed, the farm owner is notified. Below, the mode of notification to the owner of the field will be described.

First, as shown in steps S102 and S103 of FIG. 6, the irrigation channel management server 300 transmits a farm field management restriction request to the farm field management server 100 when it predicts that heavy rain will occur after a predetermined time.
In response to receiving the farm field management restriction request, the farm field management server 100 stops the control of the faucet device for farm management, and notifies the farm field main terminal 200 of the notification corresponding to the occurrence of heavy rain (pre-heavy rain notification). and to do so.
For example, the pre-heavy rain notification has a content of informing the owner of the farm that it is impossible to control the faucet device for farming because it is predicted that heavy rain will occur after a predetermined time. In addition, since it is predicted that heavy rain will occur, the control of the faucet device for storing rainwater by the irrigation channel management server 300 (that is, the irrigation water manager) first includes control for forcibly discharging the irrigation water of the field FM. May have content announcing what has been done. When the control for forcibly discharging the water in the field FM is completed according to the lapse of time, the effect may also be notified.
Also, the pre-heavy rain warning may include information such as the area range, the time zone, and the amount of rainfall in which heavy rain is expected to occur.

The farm field management server 100 may perform the above-described pre-heavy rain notification on the top page of the farm management system displayed when the farm field main terminal 200 accesses the farm field management server 100, for example. Alternatively, the farm field management server 100 may transmit an e-mail in which the body of the above-described notification content is described to the farm field main terminal 200 as the pre-heavy rain notification.

In addition, when the farm management server 100 stops controlling the faucet device for farm management in response to the reception of the farm management restriction request, the farm farm management server 100 disables reception of a predetermined operation of the farm management system for farm management by the farm owner. you can Specifically, at least an operation for remotely controlling the water faucet device in real time may not be accepted.

In addition, the agricultural field management server 100 performs notification corresponding to heavy rain (notification during heavy rain) at the agricultural field main terminal 200 in response to determination that the state before the heavy rain has changed to the state during heavy rain. make it
For example, the irrigation channel management server 300 or the agricultural field main terminal 200 may determine that the state is in a state of heavy rain based on current weather information. Alternatively, the irrigation channel management server 300 or the agricultural field main terminal 200 may make the determination based on the measurement result of the water volume of the river RV. Alternatively, when the waterway manager determines that heavy rain has occurred and performs an operation to confirm the occurrence of heavy rain on the waterway management server 300, the waterway management server 300 determines that the waterway management server 300 is in a state of heavy rain. you can

As a notification during heavy rain, for example, since heavy rain is occurring toward the farm owner, it is impossible to continue to control the faucet device for farming until the heavy rain subsides, and rainwater storage by the irrigation channel management server 300 It has content to notify that the faucet device for the purpose is being controlled. In addition, the pre-heavy rain warning may include information such as the current area range of heavy rain, the expected end time of heavy rain, and the current amount of rainfall.

The agricultural field management server 100 may perform the above-described heavy rain notification on the top page of the agricultural field management system, following the above-described pre-heavy rain notification. Alternatively, the farm field management server 100 may transmit an e-mail in which the body of the above-described notification content is described to the farm field main terminal 200 as the heavy rain notification.

In addition, the farm field management server 100 may continue to disable acceptance of a predetermined operation by the farm owner for the farm management system for farming even during heavy rain.

When the irrigation channel management server 300 determines that the heavy rain has subsided in step S108 of FIG. In response to the reception of the restriction release request, the irrigation channel management server 300 restores the control of the faucet device for farming, which has been stopped until now, as described above.
Moreover, the agricultural field management server 100 can determine that the heavy rain has subsided due to the reception of the restriction release request. Therefore, the agricultural field management server 100 causes the agricultural field main terminal 200 to issue a notification regarding the end of the heavy rain (heavy rain ending notification) in response to the reception of the restriction release request.

The notification of the end of heavy rain, for example, has the content of informing the owner of the farm that the control of the faucet device for farming has become possible because the heavy rain has ended and the suppression drainage control has been completed. Note that as the heavy rain convergence notification, when the water discharge suppression control is being performed in step S110 of FIG. 6, the water discharge suppression control may be performed. In this case, the state of transition of the water level in the field FM measured by the water level sensor during the execution of the water suppression control may also be notified.

The agricultural field management server 100 may perform the heavy rain ending notification with the above-described contents subsequent to the above-described heavy rain notification on the top page of the agricultural field management system. Alternatively, the farm field management server 100 may transmit an e-mail in which the body of the above notification content is described to the farm field main terminal 200 as notification of the convergence of heavy rain.

<Second embodiment>
[Overview]
In the first embodiment described above, in response to heavy rainfall in the area where the farm field FM under the management of the irrigation channel management server 300 exists (applicable area), only rainwater is supplied to the farm field without drawing water from the river RV. I was trying to store it in FM.
However, for example, when heavy rain occurs in an area (upstream area or downstream area) corresponding to the upstream or downstream of the river basin corresponding to the relevant area of the river RV, the water level of the river RV also rises in the relevant area. However, the amount of rainfall in this area is small. Therefore, even if only rainwater is stored in the field FM of the relevant area without drawing water from the river RV, the water level rise of the river RV cannot be effectively suppressed.
Therefore, the irrigation channel management server 300 of the present embodiment, in response to the occurrence of heavy rain in the upstream area or the downstream area, proactively supplies water from the river RV to the farm field FM in the area as described below. is taken in and stored. By taking in water from the river RV and storing it in the farm field FM in this way, it is expected to effectively suppress the increase in the water level of the river RV in the relevant area.

[Example of processing procedure]
An example of a processing procedure executed by the irrigation channel management server 300 in relation to rainwater storage will be described with reference to the flowchart of FIG. 7 .
The processing of step S201 may be the same as that of step S201 in FIG.

Step S202: Based on the weather information acquired in step S101, the storage necessity determination unit 321 determines whether heavy rain is predicted to occur after a predetermined time in the upstream area or the downstream area. If it is not predicted that heavy rain will occur, the processing in the figure may be ended.

The processing of steps S203 to S207 may be the same as steps S103 to S107 in FIG. By the processing of steps S203 to S207, the water level of each field FM in the corresponding area is below a certain level before the heavy rain, and preparations for storing water during the heavy rain are completed.

Step S208: After the rainwater can be stored as described above, the upstream area or the downstream area will be in a state of heavy rain at a certain time due to a change in weather. Therefore, the water supply/drainage control unit 322 determines whether or not the state has transitioned from the non-water intake required state to the water intake required state.
The water intake required state is a state in which water should flow into the farm field FM from the river RV in order to prevent the water level of the river RV from rising beyond the allowable limit. The water supply/drainage control unit 322 may determine that the state has transitioned to the water intake required state, for example, when the degree of increase in rainfall ascertained from weather information satisfies a predetermined condition. Alternatively, the water supply/drainage control unit 322 may determine that the state has transitioned to the water intake required state, for example, when the water level of the river RV in the upstream area or the downstream area, or the water level of the river RV in the relevant area exceeds a certain level.

Step S209: When it is determined in step S208 that the state has changed to the water intake required state, the water supply/drainage control unit 322 transmits a water intake request to the agricultural field management server 100 in the corresponding area.
Upon receiving the water intake request, the farm field management server 100 controls the farm field FM to enter a water intake state in which the water of the river RV can be taken. Specifically, when entering the water intake state, the farm field management server 100 controls the water inlet gate GTS to be in the open state, and the water tap 10 provided in the farm field FM in the corresponding area is in the open state. and
The degree of opening of the water inlet gate GTS and the degree of opening of the faucet 10 in the water intake state may be fully open or may be a predetermined degree of opening smaller than fully open. Alternatively, the degree of opening of the water inlet gate GTS and the degree of opening of the faucet 10 in the water intake state may be set according to the amount of rainfall, the water level of the river RV, and the like.
Also, the drain plugs 20 provided in the field FM in the relevant area may be maintained in the closed state obtained in steps S206 and S207.

Step S210: If it is determined in step S208 that the state has not changed to the water intake required state, or after the process of step S209, the water supply/drainage control unit 322 determines whether or not the previous water intake required state has been resolved. do. The water supply/drainage control unit 322 may determine that the water intake required state has been resolved, for example, when the degree of decrease in rainfall ascertained from weather information satisfies a certain condition. Alternatively, the water supply/drainage control unit 322 may determine that the water intake required state is resolved when the water level of the river RV in the upstream area or the downstream area, or the water level of the river RV in the relevant area becomes below a certain level.

Step S<b>211 : When it is determined in step S<b>210 that the water intake required state has been resolved, the water supply/drainage control unit 322 transmits a water intake stop request to the agricultural field management server 100 .
The farm field management server 100, in response to the reception of the water intake stop request, controls the water intake stop state from the previous water intake state to a water intake stop state in which the water of the river RV cannot be taken into the farm field FM. Specifically, the agricultural field management server 100 closes the plug portion of the water tap 10 provided in the agricultural field FM in the relevant area. At this time, the agricultural field management server 100 may perform control so that the floodgate of the water entry gate GTS is also closed. Alternatively, the agricultural field management server 100 may keep the water inlet gate GTS in a closed state and the water tap 10 in an open state as the water intake stop state.

When it is determined in step S210 that the water intake required state is not resolved, or after the process of step S211, the processes of steps S212 and S213 are executed. The processing of steps S212 and S213 may be the same as steps S108 and S109 in FIG. However, after the water level excess suppression control is executed in step S213, the process is returned to step S208, so that it is possible to transition between the water intake required state and the water intake stop state according to the situation during heavy rain. there is

The processing of steps S214 and S215 is the same as that of steps S110 and S111 in FIG.

It should be noted that in the determination of step S208 and step S210, the flow rate of the water supply channel detected by the water supply sensor (main stream water supply sensor 50A, tributary water supply sensor 50B) and the drainage sensor (main stream water supply sensor 60A, tributary water supply sensor 60B, 60B) The drain flow rate detected at may be used.

<Modification>
Modifications of this embodiment will be described below. The following modified examples can be combined as appropriate.

[First modification]
This modification 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. Therefore, when water is taken into the field FM from the river RV in response to heavy rain in the upstream region or the downstream region as in the second embodiment, muddy water may flow into the field FM. . There is an aspect that it is preferable to avoid turbid water as much as possible when taking water from the field FM into the river RV.
Therefore, in this modification, a reservoir for storing water flowing from the river RV is provided upstream of the field FM on the route from the water inlet gate GTS to the field FM through the water supply channel. to be made.

FIG. 8 shows an overall configuration example of a water management system corresponding to this modified example. In the figure, the same parts as those in FIG.
In the figure, there is one field group corresponding to the second field group in FIG. In addition, storage tanks 80-1 and 80-2 are provided in this modified example. The storage tanks 80-1 and 80-2 are referred to as the storage tank 80 when they are not particularly distinguished.
The storage tank 80 may be provided, for example, by burying a large-diameter pipe (for example, RCP (fiber reinforced composite pipe)) or a rainwater permeation tank in the ground.

A tributary water supply path BSP-1 branched from the main water supply path MSP is further branched into tributary water supply paths BSP-11 and BSP-12.
A water supply valve 81 is provided in the storage tank 80-1. A branch water supply line BSP-11 is connected to the water supply valve 81 . A drain valve 82 is provided in the storage tank 80-1. A tributary drainage channel BDR-11 is connected to the drainage valve 82 .
A water supply valve 81 and a water discharge valve 82 are also provided in the storage tank 80-2. A tributary water supply line BSP-12 is connected to the water supply valve 81 of the storage tank 80-2, and a tributary drainage line BDR-12 is connected to the drain valve 82 of the storage tank 80-2.
The water supply valve 81 and the water discharge valve 82 are controlled by the irrigation channel management server 300 .

The branch water supply channels (BSP-1, BSP-11, BSP-12) that supply water to the storage tanks 80-1 and 80-2 are the branch water supply channels BSP-1 that supply water to the field FM in the main water supply channel MSP. 2 is upstream. That is, the storage tank 80 can take in and store the water flowing from the river RV upstream of the farm field FM.

The irrigation channel management server 300 of this modified example may execute control by the same procedure as in FIG. 7 for the farm field group.
In addition, the irrigation channel management server 300 of this modified example stores the water taken in from the river RV also in the storage tank 80 in response to the water intake required state. At this time, the irrigation channel management server 300 controls the water supply valve 81 in the storage tank 80 to open and the drain valve 82 to close.

In this manner, in this modification, when the water taken from the river RV is stored in the farm field FM in the water intake required state, the 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, turbidity of the water stored in the field FM can be suppressed.

In addition, the irrigation channel management server 300 may be configured to perform suppression drainage control on the water stored in the storage tank 80 after the heavy rain subsides. In this case, the irrigation channel management server 300 may perform water suppression control so that the timing of discharging water from the farm field FM and the timing of discharging water from the storage tank 80 are different.

In addition, in the same figure, an example is shown in which the upstream side of the tributary drainage channel BDR-21 is connected to the tributary water supply channel BSP-1. By connecting the tributary drainage channel BDR-21 to the tributary water supply channel BSP-1 in this way, the water flowing into the tributary water supply channel BSP-1 flows not only into the storage tanks 80-1 and 80-2 but also into the tributary drainage channel BDR. -21 is also made to flow. As a result, for example, even if the water in the storage tank 80 is full, a part of the water that has flowed into the main water supply channel MSP is transferred to the main water supply channel MDR via the branch water supply channel BSP-1 and the branch drainage channel BDR-21. Therefore, it is possible to prevent water from overflowing from the mainstream water supply channel MSP.

The number of storage tanks 80 provided corresponding to one main water supply channel MSP is not particularly limited. Also, in the figure, two storage tanks 80 are provided in parallel, but they may be provided in series.

[Second modification]
This modified example is a modified example in which a storage tank is provided upstream of the field FM as in the first modified example.
FIG. 9 shows an overall configuration example of a water management system corresponding to this modified example. 1 and 8 are denoted by the same reference numerals, and description thereof will be omitted.
In the water management system of FIG. 8, the storage tank 80 is provided in the tributary water supply channel BSP-1 branched upstream of the main water supply channel MSP from the tributary water channel BSP-2 that supplies water to the field FM. .
On the other hand, in this modification, as shown in FIG. 9, a storage tank 80A is provided between the upstream main water supply channel MSP-U and the downstream main water supply channel MSP-D. there is That is, as in this modification, the storage tank 80A may be provided in the mainstream water supply channel upstream of the field FM.
In the example shown in the figure, water flows into the storage tank 80A through the water supply valve 81 from the main water supply channel MSP-U on the upstream side. In addition, the water in the storage tank 80A can be discharged to the tributary drainage channel BDR-1 through the drain valve 82-1, and to the downstream main water supply channel MSP-D through the drain valve 82-2. can also be discharged.

In this case, the irrigation channel management server 300 normally stores water in the storage tank 80A, or causes the storage tank 80A to store water taken in from the river RV through the water inlet gate GTS in the storage tank 80A. water is supplied to the main stream water supply channel MSP-D on the downstream side via a bypass route (not shown). As a result, the farm field management server 100 can supply water for farming to the farm field FM during normal times.
In response to heavy rain, for example, the irrigation channel management server 300 causes the storage tank 80A to first store water taken in from the river RV, and when the amount of water stored in the storage tank 80A exceeds a certain level, Water may be discharged from 80A to the tributary drainage channel BDR-1 and the downstream mainstream water supply channel MSP-D as appropriate.
With such a configuration, if it is possible to store water in the storage tank 80 to suppress the increase in the water level of the river RV during heavy rain, it is not necessary to store muddy water in the field FM. Further, even when turbid water is accumulated in the farm field FM, the turbidity of the water can be suppressed.

[Third Modification]
In each of the previous embodiments, the faucet device (the water faucet 10 and the drain faucet 20) adjusts the amount of water flowing from the water inlet to the water outlet by adjusting the degree of opening of the faucet. In addition, when the irrigation channel management server 300 controls the faucet device so that the water level in the field FM reaches a certain target value, the water level detected by the water level sensor provided in the field FM is monitored. rice field.

In this modified example, a water level adjustment pipe is used instead of the drain plug 20 as a drainage device for discharging water from the farm field FM to the drainage channel. The water level adjustment pipe is a drainage pipe provided so as to be able to adjust the water level of the field FM by adjusting the height of the upper end opening. In this modified example, the height of the upper end opening of the water level adjusting pipe is made adjustable under the control of the agricultural field management server 100 .

FIG. 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 the figure, the same parts as those in FIG. 1 etc. 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 portion extends along the vertical direction as shown in the figure. The water level adjustment pipe 70 can be operated to move in a predetermined movable range in the vertical direction by the driving device 20A. The driving device 20A can drive the water level adjusting pipe 70 according to manual operation, for example. Further, the driving device 20A can drive the water level adjustment pipe 70 under the control of the canal management server 300 by being able to communicate with the canal management server 300 .
The lower side of the water level adjusting pipe 70 is connected to one end of the drain pipe 71 . The drain pipe 71 is buried under the ridge RD and the other end is provided to discharge water to the tributary drain BDR.
In addition, the figure 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 farm field FM. In this modified example, the water level sensor 30 for farming is capable of detecting (measuring) the water level up to the upper limit determined according to farming.
Further, the water 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.

In the case of the farm field FM provided with the water level adjusting pipe 70 as described above, the target water level under farming is set corresponding to the height of the upper end opening of the water level adjusting pipe 70 . In FIG. 10(A), the height of the upper end opening of the water level adjustment pipe 70 is the same as the upper limit water level during farming, so that the water level in the field FM becomes the upper limit water level during farming. is shown.

In addition, in FIG. 10B, the height of the upper end opening of the water level adjustment pipe 70 is set lower than in FIG. is shown.

In the case of this modification, the irrigation channel management server 300 performs forced control of the faucet device (discharge of irrigation water from the farm field FM before heavy rain, control of rainwater storage and excess water level prevention during heavy rain, suppression and drainage control after the end of heavy rain, etc.) In order to achieve the target water level, the height of the water inlet at the upper end of the water level adjusting pipe 70 is controlled. For this reason, the irrigation channel management server 300 controls the driving device 20A so that the upper end opening of the water level adjusting pipe 70 has a height corresponding to the target water level. Control in this case may be performed via the agricultural field management server 100 .
In addition, when the faucet device is forcibly controlled, it is necessary to monitor and adjust the water level including the water level range higher than the upper limit of the water level detectable by the water level sensor 30 for farming. Therefore, the irrigation channel management server 300 uses the water level detected by the irrigation channel management sensor 40 when forcibly controlling the faucet device.

[Fourth Modification]
The upper limit of the water level adjustment range of the water level adjustment pipe 70 that adjusts the water level under the third modification may be lower than the height of the ridge. However, during heavy rain, it may be desired to store rainwater in the farm field FM with the height of the ridge as the upper limit. In this case, in the farm field FM having the water level adjustment pipe 70, rainwater can be stored only 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, rainwater can be stored in the farm field FM with the height of the ridge as the upper limit even in the farm field FM having the water level adjusting pipe 70 .

FIG. 11(A) shows an example of a mode of farm field FM corresponding to this modified example. 10(A) and 10(B) are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
In the farm field FM shown in the figure, an enclosure BX is provided so as to cover the water level adjustment pipe 70 . The enclosing box BX is provided so that the height of the top surface is the same as the height h of the ridge RD.
The enclosing box BX has an open top and side openings OP. The side opening OP is opened and closed by the gate G in accordance with the drive device 20B driving the gate G to move it up and down.

FIG. 11A shows a state in which the opening OP is opened in response to the gate G being pulled up. When the opening OP is open, water in the farm field FM enters from the side of the enclosure 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 adjusting 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 adjusting pipe 70 . During farming, the water level of the farm field FM is adjusted by adjusting the height of the water level adjusting pipe 70 after opening the opening OP of the enclosure BX.

On the other hand, when performing forced control of the faucet device in response to the occurrence of heavy rain (discharge of irrigation water from field FM before heavy rain, control of rainwater storage and excess water level prevention control during heavy rain, control drainage control after heavy rain settles, etc.) Then, the canal management server 300 controls the driving device 20B so that the gate G closes the opening OP of the enclosure BX. At this time, the water level adjustment pipe 70 does not need to be controlled to have a specific height. Moreover, the control of the driving device 20B by the irrigation channel management server 300 in this case may be performed via the agricultural field management server 100 .
In this modified example, since the opening OP of the enclosure box BX is closed as described above, the water in the farm field FM is stored without flowing into the opening OP during heavy rain. rising. When the water level reaches the upper end of the enclosing box BX, the water stored in the farm field FM flows into the inside from the upper end of the enclosing box BX. Therefore, the water level of the field FM in this case is maintained at the height of the ridge RD corresponding to the upper end of the enclosure box BX.
Thus, in this modification, even if the upper limit water level to be stored in the field FM in response to heavy rain (upper limit water level for storage) is higher than the adjustable range by the water level adjusting pipe 70, By providing the enclosure BX, it is possible to maintain the field FM at the upper limit water level for storage when heavy rain occurs.

In addition, in the third modification and the fourth modification, a drain plug may be further provided in the field FM for assisting drainage from the field FM before heavy rain occurs. As a result, it is possible to drain the water from the farm field FM before the occurrence of heavy rain in a shorter time.

[Fifth Modification]
In each of the above-described embodiments, in addition to the water tap 10, a water tap corresponding to water channel management, which cannot be controlled by the farm field management server 100 but can be controlled by the water channel management server 300, may be provided in the farm field FM. Similarly, in addition to the drain plug 20, a drain plug for channel management that cannot be controlled by the farm field management server 100 but can be controlled by the channel management server 300 may be provided in the field FM.
In this case, the irrigation channel management server 300 restricts the control by the agricultural field management server 100 for all the water faucets 10 and the drainage faucets 20 in response to the prediction of the occurrence of heavy rain. For control (discharge of irrigation water from field FM before heavy rain, excessive water level suppression control during heavy rain, control drainage control after heavy rain subsides, etc.), the faucet and drain faucet corresponding to irrigation channel management are controlled.

[Sixth Modification]
The irrigation channel management server 300 and the agricultural field management server 100 may be integrated and configured as one server. Alternatively, the functions of the irrigation channel management server 300 may be distributed among a plurality of servers. Also, the functions of the agricultural field management server 100 may be distributed to a plurality of servers.

A program for realizing the functions of the above-described faucet device (water faucet 10, drain faucet 20), farm field management server 100, irrigation channel management server 300, farm field main terminal 200, etc. is recorded in a computer-readable recording medium. Then, by causing the computer system to read and execute the program recorded in the recording medium, the water tap device (the water tap 10, the drain tap 20), the farm field management server 100, the irrigation channel management server 300, and the farm field main terminal 200 etc. may be processed. Here, "loading and executing the program recorded on the recording medium into the computer system" includes installing the program in the computer system. The "computer system" here includes hardware such as an OS and peripheral devices. Also, the "computer system" may include a plurality of computer devices connected via a network including communication lines such as the Internet, WAN, LAN, and dedicated lines. The term "computer-readable recording medium" refers to portable media such as flexible discs, magneto-optical discs, ROMs and CD-ROMs, and storage devices such as hard discs incorporated in computer systems. Thus, the recording medium storing the program may be a non-transitory recording medium such as a CD-ROM. Recording media also include internal or external recording media accessible from the distribution server for distributing the program. The program code stored in the recording medium of the distribution server may be different from the program code in a format executable by the terminal device. That is, as long as it can be downloaded from the distribution server and installed in a form that can be executed on the terminal device, the form stored in the distribution server does not matter. It should be noted that the program may be divided into a plurality of programs, and the divided programs may be downloaded at different timings and then integrated in the terminal device, or the distribution servers that distribute the divided programs may be different. Furthermore, a "computer-readable recording medium" is a volatile memory (RAM) inside a computer system that acts as a server or client when the program is transmitted via a network, and retains the program for a certain period of time. It shall also include things. Further, the program may be for realizing part of the functions described above. Further, it may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

10 water tap, 20 drain tap, 30 water level sensor, 40 water level sensor, 50A mainstream water supply sensor, 50B tributary water supply sensor, 60A mainstream drainage sensor, 60B tributary drainage sensor, 80 (80-1, 80-2, 80A) storage tank , 100 field management server, 101 communication unit, 102 control unit, 103 storage unit, 131 field management information storage unit, 200 field main terminal, 300 irrigation channel management server, 301 communication unit, 302 control unit, 303 storage unit, 321 storage requirement No determination unit 322 water supply and drainage control unit 331 irrigation channel information storage unit 332 tributary water supply channel information storage unit 333 tributary drainage channel information storage unit 334 water level sensor information storage unit

Claims (6)

a drainage device provided to drain water from the field;
A field water management system comprising: a drainage control unit that controls the drainage device so that water can be stored in the field after limiting control of the drainage device performed in response to farming. A storage necessity determination unit that determines whether it is necessary to store water in the field,
The agricultural field water management system according to claim 1, wherein the storage necessity determination unit determines whether or not it is necessary to store water in the agricultural field based on weather information. The drainage control unit determines that it is no longer necessary to store water in the agricultural field after the storage necessity determining unit determines that it is necessary to store water in the agricultural field. The agricultural field water management according to claim 2, wherein the discharge of water by the drainage device is controlled so that the amount of water discharged into the drainage channel is limited to a predetermined level or less when the stored water is brought to a predetermined water level. system. The drainage control unit
2. The drainage device is controlled so that the water level in the field is below a predetermined level before the drainage control unit controls the drainage device so that water can be stored in the field. 4. The field water management system according to any one of 3. A field water management method in a field water management system provided with a drainage device for discharging water from a field,
A farm field water management method comprising: a drainage control step of controlling the drainage device so that water can be stored in the farm field after limiting the control of the drainage device performed in response to farming. A computer in a field water management system equipped with a drainage device for discharging water from a field,
A program for functioning as a drainage control unit that controls the drainage device so that water can be stored in the farm field after limiting the control of the drainage device that is performed in response to farming.

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