Field Water Storage System

Abstract

To provide a farm field water storage system capable of suppressing the rise or flooding of a river due to heavy rainfall or the like.SOLUTION: A farm field water storage system comprises a service water management server 28 capable of controlling a water supply device 31 and a drain device 33 which manage water feeding / draining of a farm field H. The service water management server 28 is equipped with: a normal mode in which a drainage height of the farm field H is adjusted corresponding to a predetermined condition; and a dam mode in which a larger amount of water than in the normal mode can be stored in the farm field H regardless of the predetermined condition by setting the drainage height of the farm field H higher than the drainage height in the normal mode, as control modes for controlling the water supply device 31 and the drain device 33.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a technique for a field water storage system that stores water in a field. [Background technology]

[0002] Conventionally, the technology of a field water storage system for storing water in a field has been publicly known.

[0003] The automatic water management device (field water storage system) described in Patent Document 1 comprises a water supply pump and a drainage pump for supplying and draining water to and from the field, a water level controller that controls the water supply pump and the drainage pump to adjust the water level in the field, and a computer connected to the water level controller. The computer estimates the water level appropriate for the growth stage of the crop, and issues an instruction to the water level controller to adjust the water level based on the estimation result. The water level controller adjusts the water level in the field based on the instruction.

[0004] As described in Patent Document 1, water can be stored in farm fields. Therefore, by storing rainwater in farm fields during heavy rainfall, it is possible to prevent the inflow of rainwater into rivers, and thus prevent the rise and overflow of rivers. For this reason, there are hopes for a technology that can utilize farm fields to prevent the rise and overflow of rivers. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-87856 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and the problem it aims to solve is to provide a field water storage system that is capable of preventing rivers from rising or overflowing due to heavy rain or the like. [Means for solving the problem]

[0007] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0008] That is, in claim 1, there is provided a field water storage system comprising a control unit capable of controlling a field water management device that manages the supply and drainage of a field, the control unit having control modes for controlling the field water management device, a first mode for adjusting the drainage height of the field in accordance with predetermined conditions, and a second mode for setting the drainage height of the field higher than the drainage height in the first mode regardless of the predetermined conditions, thereby making it possible to store a larger amount of water in the field than in the first mode, and in the second mode, after setting the drainage height of the field to a first drainage height and draining the water from the field once, setting the drainage height of the field to a second drainage height higher than the first drainage height, This is set by dividing the fields into groups in advance. A plurality of farm field groups can be set, and the control mode can be switched for each of the farm field groups. The control unit has, as switching modes for switching the control mode, an automatic mode in which the control modes of the plurality of field groups are automatically switched in a set sequence, and a manual mode in which the control modes of the plurality of field groups are switched by a manual operation of a user, and in the automatic mode, the control mode is switched according to a predetermined set time. It is something.

[0009] In claim 2, the control unit is The set time is changeable. .

[0010] In claim 3, A field water storage system including a control unit capable of controlling a field water management device that manages water supply and drainage of a field, the control unit has, as control modes for controlling the field water management device, a first mode in which a drainage height of the field is adjusted in accordance with a predetermined condition, and a second mode in which a larger amount of water can be stored in the field than in the first mode by setting the drainage height of the field higher than the drainage height in the first mode regardless of the predetermined condition, and in the second mode, after setting the drainage height of the field to a first drainage height and draining the water of the field once, the drainage height of the field is set to a second drainage height higher than the first drainage height, and a plurality of field groups are set by grouping the fields in advance, and the control mode can be switched for each of the field groups, and the control unit can change the first drainage height and / or the second drainage height in the second mode for each of the fields. It is something.

[0013] Claim 4 a field water storage system including a control unit capable of controlling a field water management device that manages the water supply and drainage of a field, the control unit having control modes for controlling the field water management device, a first mode for adjusting a drainage height of the field in accordance with predetermined conditions, and a second mode for setting the drainage height of the field higher than the drainage height in the first mode regardless of the predetermined conditions, thereby making it possible to store a larger amount of water in the field than in the first mode, and in the second mode, after setting the drainage height of the field to a first drainage height and draining the water from the field once, setting the drainage height of the field to a second drainage height higher than the first drainage height, This is set by dividing the fields into groups in advance.A plurality of field groups can be set, and the control mode can be switched for each field group. The switching modes for switching the control mode include an automatic mode in which the control modes of the plurality of field groups are automatically switched in a set order, and a manual mode in which the control modes of the plurality of field groups are switched by manual operation by a user, and in the automatic mode, the control mode is switched according to a predetermined set time. Effect of the Invention

[0015] The present invention has the following advantages.

[0016] In claim 1, by switching the control mode to the second mode, a larger amount of water can be stored in the field compared to the first mode. This makes it possible to use the field as a dam and suppress rising water levels and flooding of rivers caused by heavy rain, etc. Also, by temporarily draining the water in the field, a larger amount of water can be stored in the field. Also, Field By dividing the fields into multiple groups and switching the control mode for each field group, it is possible to simplify the management of water supply and drainage. In addition, the convenience can be improved by selectively using an automatic mode in which the control mode is automatically switched and a manual mode in which the control mode is manually switched. Also, the control mode can be appropriately switched according to a preset time.

[0017] In claim 2, By arbitrarily changing the set time, the control mode can be switched more appropriately. For example, by arbitrarily changing the set time according to the size of the river, it is possible to effectively suppress the rise and overflow of the river. It is possible.

[0018] In claim 3, By switching the control mode to the second mode, a larger amount of water can be stored in the field compared to the first mode. This allows the field to be used as a dam to prevent rivers from flooding or rising due to heavy rain. Also, by draining the water from the field once, a larger amount of water can be stored in the field. Furthermore, by dividing the field into multiple field groups and switching the control mode for each field group, it is possible to simplify the management of water supply and drainage. Also, the drainage height can be set appropriately for each field.

[0021] Claim 4 In the above, by switching the control mode to the second mode, a larger amount of water can be stored in the field compared to the first mode. This allows the field to be used as a dam to prevent rivers from rising or overflowing due to heavy rain, etc. Also, by temporarily draining the water from the field, a larger amount of water can be stored in the field. FieldBy dividing the fields into multiple field groups and switching the control mode for each field group, it is possible to simplify the management of water supply and drainage. In addition, convenience can be improved by selectively using an automatic mode in which the control mode is switched automatically and a manual mode in which the control mode is switched manually. In addition, the control mode can be switched appropriately according to a preset time. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is an explanatory diagram showing water supply and drainage paths to a field in the field water storage system according to one embodiment of the present invention. [Diagram 2] FIG. 1 is an explanatory diagram showing the configuration of a field water management system. [Diagram 3] FIG. 1 is a block diagram showing a field water storage system. [Figure 4] A diagram showing the flow of preventing river flooding and rising water levels using dam mode. [Diagram 5] FIG. 13 is a block diagram showing a screen generated by the water management server. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 13 is a diagram showing a weather graph setting screen. [Figure 9] A diagram showing the dam management screen. [Figure 10] A diagram showing detailed information of a field displayed on the dam management screen. [Figure 11] FIG. [Figure 12] FIG. 13 is a diagram showing how the manual mode is executed on the operation screen. [Figure 13] 4A and 4B are diagrams showing a time setting section and a group setting section of a setting screen. [Figure 14] FIG. 4 is a diagram showing a device setting section of a setting screen. [Figure 15] 13 is a flowchart showing an automatic damming process. [Figure 16] A diagram showing how "Control objects 1 to 3" are put into dam mode during automatic damming processing. [Figure 17](a) A diagram showing the state where "Control object 1" is at "Dam preparation drainage height". (b) A diagram showing the state where "Control object 2" is at "Dam preparation drainage height". (c) A diagram showing the state where "Control object 1" is at "Dam storage drainage height". [Figure 18] 13 is a flowchart showing an automatic return process. [Figure 19] A diagram showing how "controlled objects 1 to 3" are returned to normal mode by automatic return processing. [Figure 20] (a) A diagram showing the state where "controlled object 1" is returned to the normal mode, (b) A diagram showing the state where "controlled object 2" is returned to the normal mode, and (c) A diagram showing the state where "controlled object 3" is returned to the normal mode. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, a farm water storage system 10 according to one embodiment of the present invention will be described.

[0025] 1 is for storing precipitation in a field H in the event of heavy rainfall, etc., to prevent rivers from rising or overflowing. The field water storage system 10 includes an irrigation water management system 20 and a field water management system 30.

[0026] The water management system 20 is for managing water (irrigation water) supplied from a water source to a farm field H. The water management system 20 includes a water intake 21, a first pump 22, a water reservoir 23, a water distribution device 24, a second pump 25, a drainage gate 26, a user terminal 27, and a water management server 28.

[0027] The water intake 21 is for taking in water from a water source (in this embodiment, a main river (main stream river) R1) into an irrigation channel.

[0028] The first pump 22 is for pumping up the water taken in through the water intake 21 and supplying it to the water distribution reservoir 23.

[0029] The distributing reservoir 23 is for storing water to be supplied to the farm field H. The distributing reservoir 23 is connected to a plurality of water distribution devices 24 via water distribution pipes 23a. The water stored in the distributing reservoir 23 is sent to the water distribution devices 24 via the water distribution pipes 23a.

[0030] The water distribution device 24 adjusts the amount of water supplied to a water supply pipe 24b for supplying water to the field H. The water distribution device 24 is connected to a plurality of fields H via a water distribution pipe 24a and water supply pipes 24b connected to the water distribution pipe 24a. The water sent to the water distribution device 24 is sent to the water supply pipe 24b via the water distribution pipe 24a, and is appropriately supplied to the field H by a field water management system 30 described below. In addition, the water supplied to the field H is appropriately discharged from the field H by the field water management system 30, and sent to a tributary (tributary river) R2 via a drainage channel 24c.

[0031] The second pump 25 is for sending water from the tributary R2 to the main river R1 through a drainage gate 26. The second pump 25 is provided on the downstream side of the tributary R2 (the side closer to the main river R1).

[0032] The drainage gate 26 is provided to prevent backflow of water from the main river R1 to the tributary R2 when the water level of the main river R1 rises. The drainage gate 26 is provided at the confluence of the main river R1 and the tributary R2.

[0033] The user terminal 27 is a terminal used by a user (a person who manages irrigation water using the field water storage system 10). The user terminal 27 includes a calculation device capable of executing calculation processing, a storage device in which programs and the like are stored, an input device into which information can be input, and an output device capable of displaying the results of calculation processing and the like. The user terminal 27 is configured by a personal computer, a smartphone, or the like.

[0034] The water management server 28 shown in Figures 1 to 3 performs various processes. The water management server 28 includes a calculation device capable of executing calculation processes, a storage device in which programs and the like are stored, and the like. The water management server 28 is connected to the first pump 22, the water distribution device 24, the second pump 25, and the drainage gate 26, and can transmit signals to the first pump 22, etc. This allows the water management server 28 to control the first pump 22, etc.

[0035] The water management server 28 of this embodiment is connected to a user terminal 27, and can exchange information with the user terminal 27. The user can operate the user terminal 27 to send a predetermined signal to the water management server 28 to control the first pump 22, etc., and can arbitrarily determine the water level of the reservoir 23, the amount of water supplied to the water supply pipe 24b, the timing of flowing water from the tributary R2 to the main river R1, etc.

[0036] The field water management system 30 serves to supply and drain water to each field H. As shown in Fig. 2, the field water management system 30 includes a water supply device 31, a water level and water temperature sensor 32, a drainage device 33, a communication repeater 34, an owner terminal 35, a field management server 36, and a data center 37.

[0037] The water supply device 31 is for managing the water supply to the field H. The water supply device 31 is provided in each field H. The water supply device 31 includes a communication device for communicating with the communication repeater 34 described below, and a water supply tap (not shown) provided in a waterway connecting the water supply pipe 24b and the field H. The water supply device 31 can switch between a state in which water can be supplied to the field H and a state in which water cannot be supplied, by opening and closing the water supply tap. The water supply device 31 can also adjust the amount of water supplied to the field H depending on the opening degree of the water supply tap.

[0038] The water level and water temperature sensor 32 is for measuring the water level and water temperature in the field H. The water level and water temperature sensor 32 is provided in each field H. The water level and water temperature sensor 32 is connected to the water supplying device 31 and can transmit the measurement results of the water level and water temperature to the water supplying device 31.

[0039] The drainage device 33 is for managing the drainage of the field H. The drainage device 33 is provided in each field H. The drainage device 33 includes a communication device (not shown) for communicating with the communication repeater 34, and a lifting body 33a (see FIG. 16) provided at the drainage outlet of the field H. The drainage device 33 discharges the water of the field H that exceeds the lifting body 33a to the drainage channel 24c. In this way, water can be stored in the field H up to a water level that is the same height as the height position (height position of the upper surface) of the lifting body 33a. Hereinafter, such a height position of the lifting body 33a (water level that can be stored in the field H) is referred to as the "drainage height."

[0040] The communication repeater 34 is a device capable of wireless communication. The communication repeater 34 can exchange information with the water supply device 31, the drainage device 33, and a farm land management server 36 (described later) via wireless communication.

[0041] The owner terminal 35 is a terminal owned by the owner of the field H. The owner terminal 35 includes a calculation device capable of executing calculation processing, a storage device in which programs and the like are stored, an input device into which information can be input, and an output device capable of displaying the results of calculation processing and the like. The owner terminal 35 is configured by a smartphone, a personal computer, or the like.

[0042] The farm field management server 36 is for carrying out processes related to water supply and drainage of the farm field H. The farm field management server 36 is configured as a cloud server (strictly speaking, a server virtually constructed within the cloud server). The farm field management server 36 can exchange information with the water supply device 31 and the drainage device 33 via the communication repeater 34. The farm field management server 36 can acquire various information by receiving signals from the water supply device 31 and the drainage device 33. For example, the farm field management server 36 can acquire the opening degree of the water supply faucet and the measurement results of the water level and water temperature sensor 32 based on the signal from the water supply device 31. The farm field management server 36 can also acquire the current drainage height based on the signal from the drainage device 33.

[0043] The farm field management server 36 can also control the water supply and drainage of the field H by sending signals to the water supply device 31 and the drainage device 33. For example, the farm field management server 36 can open and close the water tap by sending a signal to the water supply device 31, and can switch between a state in which water can be supplied to the field H and a state in which water cannot be supplied, and can adjust the opening degree of the water tap. The farm field management server 36 can also change the drainage height by sending a signal to the drainage device 33. The farm field management server 36 can adjust the water level of the field H by controlling the water supply and drainage in this way.

[0044] Furthermore, the farm field management server 36 can exchange information with the owner terminal 35 via an internet line or the like. By operating the owner terminal 35, the owner can receive signals from the farm field management server 36 and check the water level and the like of the field H. By operating the owner terminal 35, the owner can also send signals to the field management server 36 and remotely control the water supply and drainage of the field H.

[0045] The data center 37 is a facility for storing various information related to the field H and the field water management system 30. The data center 37 is provided with a storage device (e.g., large-capacity storage) for storing information, and the measurement results of the water level and temperature sensor 32 and the history of changes to the drainage height are stored in the storage device. The data center 37 can store information transmitted from the field management server 36 in the storage device. Furthermore, the data center 37 can transmit the information stored in the storage device to the field management server 36 when requested by the field management server 36.

[0046] The water management server 28 of the field water storage system 10 configured as described above is connected to the field management server 36 and can exchange information with the field management server 36. The water management server 28 can obtain various information from the field water management system 30 by receiving signals from the field management server 36. Specifically, the water management server 28 can obtain information such as the opening degree of the water supply tap, the water level and water temperature of the field H, and the current drainage height.

[0047] In addition, the water management server 28 can control the field water management system 30 (the water supply device 31 and the drainage device 33) by transmitting a signal to the field management server 36. The water management server 28 has a normal mode and a dam mode as control modes for controlling the field water management system 30.

[0048] The normal mode is a mode in which the drainage height is adjusted according to a predetermined condition. The normal mode is mainly executed when the weather is stable. In the normal mode, the amount of water supplied to the field H and the drainage height are adjusted so that the water level (set water level) is suitable for the growth of the crops in the field H. The adjustment of the amount of water supplied, etc. in the normal mode is performed by the field management server 36. Specifically, the field management server 36 determines the amount of water supplied and the drainage height based on the variety and growth condition of the crop, and automatically adjusts the amount of water supplied and the drainage height based on the result of the determination. In the following, the drainage height in the normal mode is referred to as the "normal drainage height". The "normal drainage height" is preset based on the variety and growth condition of the crop, and the set value is stored in the storage device of the field management server 36. The set value can be changed at will by the owner of the field H by operating the owner terminal 35.

[0049] When the normal mode is to be executed, the water management server 28 transmits a signal instructing execution of the normal mode to the farm land management server 36. Thus, the water supply amount and the drainage height in the normal mode are adjusted by the farm land management server 36 or the owner.

[0050] Unlike the normal mode, the dam mode is a mode that allows a larger amount of water to be stored in the field H than in the normal mode, regardless of the crop growth conditions, etc. (predetermined conditions). The dam mode is executed when unstable weather is expected (such as when heavy rain is forecast). In the dam mode, water supply is stopped and the drainage height is set to a drainage height higher than the "normal drainage height". The water supply and drainage height in the dam mode are controlled by the water management server 28.

[0051] Specifically, the water management server 28 transmits signals related to the opening degree of the water supply valve and the drainage height to the field management server 36. The field management server 36 controls the water supply device 31 and the drainage device 33 based on the signals. In this way, the water management server 28 adjusts the amount of water supplied to the field H and the drainage height in the dam mode. In the dam mode in this embodiment, as described later, the drainage height is once lowered and then finally set to a drainage height higher than the "normal drainage height". Hereinafter, such a drainage height higher than the "normal drainage height" is referred to as the "dam storage drainage height". The "dam storage drainage height" is set in advance, and the set value is stored in the storage device of the water management server 28.

[0052] By executing the dam mode, the water management server 28 can use the field H as a dam to prevent the rise and flooding of rivers when heavy rain falls.

[0053] Fig. 4 is a diagram showing an example of a flow in which rising water and flooding of a river are suppressed by the dam mode. Below, an overview of the flow shown in Fig. 4 will be explained using Figs. 2 and 4.

[0054] When heavy rain is predicted, the user decides whether or not to switch from the normal mode to the dam mode. When the user decides to switch to the dam mode, the user operates the user terminal 27 and issues an instruction to the water management server 28 to switch to the dam mode (step S10).

[0055] The water management server 28 stops the water supply to the field H by the water supply device 31, and changes the drainage height of the drainage device 33 to a lower drainage height than the "normal drainage height" (step S20). The water management server 28 maintains this state for a predetermined time. This causes the water management server 28 to temporarily drain the water from the field H, and ensures the capacity of water that can be stored in the field H before heavy rain falls.

[0056] In the following, the drainage height when the water of the field H is drained once is referred to as the "dam preparation drainage height." In addition, in the following, the time for which the water is drained once (the time for which the "dam preparation drainage height" is maintained) is referred to as the "dam mode transition drainage time." The "dam preparation drainage height" and the "dam mode transition drainage time" are set in advance, and the set values ​​are stored in the storage device of the water management server 28.

[0057] The irrigation water management server 28 raises the drainage height (step S30) after once draining the water from the field H. In this way, the irrigation water management server 28 changes the drainage height to the "drainage height during dam storage".

[0058] When rain falls in this state, the rain that falls on field H or its vicinity is stored in field H. Because the drainage height of field H is set relatively high (at "drainage height during dam storage"), a large amount of precipitation can be stored in field H (step S40). In this way, by temporarily storing precipitation in field H, it is possible to prevent a large amount of precipitation from flowing into the river (main river R1 or tributary R2), and thus to prevent the river from rising and overflowing (step S50).

[0059] The user judges whether the weather and the flooding of the river have improved. If the user judges that the weather and the flooding of the river have improved, the user operates the user terminal 27 (step S60) and issues an instruction to the water management server 28 to switch from the dam mode to the normal mode (step S70). Thus, in the field H, water supply is resumed and the drainage height of the drainage device 33 is returned to the original level (set to the "normal drainage height").

[0060] In this way, by switching between normal mode and dam mode, the water management server 28 can adjust the water level in the field H to a water level suitable for crops during normal times when the weather is stable, and can temporarily store precipitation in the field H during heavy rain to prevent rivers from rising and flooding.

[0061] The water management server 28 of this embodiment can generate a plurality of screens related to the normal mode and the dam mode as described above. Specifically, the water management server 28 can generate a map screen 110, a weather graph setting screen 120, a dam management screen 130, an operation screen 140, and a mode setting screen 150, as shown in FIG.

[0062] First, an overview of the various screens (such as the map screen 110) will be described. The various screens are dynamic Web pages generated by a CGI (Common Gateway Interface) program, etc. The various screens can be displayed on the browser of the user terminal 27.

[0063] Various screens (such as the map screen 110) are divided vertically into three by a first frame 101, a second frame 102, and a third frame 103 (see Figs. 6 to 14). The first frame 101 and the second frame 102 are sections for switching between various screens. The first frame 101 and the second frame 102 are located at the top of the screen. Character strings indicating various screens are displayed in the first frame 101 and the second frame 102. The third frame 103 is a section for displaying information corresponding to various screens. The user can change the content displayed in the third frame 103 by selecting information displayed in the first frame 101 and the second frame 102. In this way, the user can switch between various screens.

[0064] Next, the map screen 110, the weather graph setting screen 120, the dam management screen 130, the operation screen 140, and the mode setting screen 150 will be described in detail.

[0065] 6 is a screen that displays a map and rainfall (precipitation) of the field H. The map screen 110 is displayed by selecting the character string "Overall Map" in the first frame 101. The map screen 110 (third frame 103) includes a map display section 111 and a rainfall display section 112.

[0066] The map display section 111 is a section that displays a map of the field H. The irrigation water management server 28 acquires map information from a predetermined server, and displays the map information on the map display section 111. On the map display section 111, a mark 111a and a weather information button 111b are arranged.

[0067] Mark 111a is a mark indicating a predetermined point. Weather information button 111b is a button for displaying weather information for a predetermined area (for example, an area within a predetermined range including the point indicated by mark 111a, or other areas displayed on map display section 111). When weather information button 111b is pressed, water management server 28 displays the long-term predicted precipitation amount (for example, predicted precipitation amount for the next 72 hours) for the predetermined area.

[0068] The rainfall display section 112 is a section that displays, in a graph 112a, the maximum rainfall forecast for an area within a range of 50 km (100 km square) on each side of the east, west, north, and south centered on the point indicated by the mark 111a. Specifically, the water management server 28 divides the area into meshes with sides of 1 km, and acquires the rainfall forecast for each mesh from a specified server. Then, based on the acquired rainfall forecast, the water management server 28 extracts a mesh that is expected to have the most rainfall within a specified period of time (for example, within one hour or 24 hours), and creates and displays a graph 112a of the rainfall forecast for that mesh. The graph 112a is a bar graph showing the rainfall for each hour. Note that the graph 112a in this embodiment shows the maximum rainfall forecast for an area of ​​50 km (100 km square) on each side of the east, west, north, and south, but the range is not particularly limited and can be changed arbitrarily.

[0069] 7, when graph 112a is selected, weather information display screen 113 is displayed. Weather information display screen 113 is a screen for enlarging and displaying graph 112a. On weather information display screen 113, the vertical bars of graph 112a are displayed in different colors according to the amount of rainfall.

[0070] Specifically, the storage device of the water supply management server 28 stores, as thresholds related to rainfall, rainfall at an advisory level (e.g., 20 mm / h or more) and rainfall at an alarm level (e.g., 30 mm / h or more). The water supply management server 28 compares the hourly rainfall with the thresholds to display the graph 112a in different colors.

[0071] The weather information display screen 113 also displays the amount of rain that has fallen so far ("Actual" shown in FIG. 7) and a detailed forecast of the amount of precipitation within the next hour ("5-minute forecast"). The weather information display screen 113 also allows the user to download weather information to the user terminal 27 (download button) and check past weather information (display past actual button).

[0072] By displaying the map screen 110 configured as described above, the user can grasp upcoming weather conditions, etc., and can easily decide whether to switch between the normal mode and the dam mode.

[0073] The map screen 110 shown in Figs. 6 and 7 is an example, and the information displayed on the map screen 110 can be changed arbitrarily. For example, the map screen 110 can also display the water level of the main river R1 and the basin rainfall index (a calculated amount of rainfall that falls in an area (basin) along a river and moves downstream, quantified). With this configuration, the user can decide to switch to the dam mode when the water level of the main river R1 rises or when the basin rainfall index predicts a rise in the water level of the main river R1. The user can also decide to maintain the normal mode (not to prepare to drain the water from the field H, etc.) when the basin rainfall index predicts no rise in the water level of the main river R1. When displaying the water level of the main river R1 in this way, a water level gauge for measuring the water level can be appropriately installed in the main river R1.

[0074] The weather graph setting screen 120 shown in Fig. 8 is a screen for making settings related to the display of the rainfall display section 112 (see Fig. 6). The weather graph setting screen 120 is displayed by selecting appropriate information in the first frame 101 and the second frame 102. In the weather graph setting screen 120, thresholds and the like used for color-coding the graph 112a shown in Fig. 7 can be set (setting of warning values, etc.).

[0075] The dam management screen 130 shown in Fig. 9 is a screen for managing the field H. The dam management screen 130 is displayed by selecting the character string "Overall monitoring" in the first frame 101 and the character string "Field map" in the second frame 102. On the dam management screen 130, a mark indicating the state of the field H is displayed superimposed on the map information of the field H. Specifically, on the dam management screen 130, a mark indicating the open / closed state of the water faucet, a mark indicating whether the mode is normal or dam mode, and a mark indicating whether the current water level of the field H has reached the set water level (a target value for control (e.g., a water level suitable for crop growth)) are displayed.

[0076] Here, the storage device of the water management server 28 stores whether the field H is in normal mode or dam mode. When the water management server 28 displays the dam management screen 130 as described above, it acquires the open / closed state of the water faucet, the current water level of the field H, and the set water level of the field H from the field management server 36, and determines whether the set water level has been reached based on the acquired results. The water management server 28 appropriately displays a mark on the dam management screen 130 based on the information in the storage device, the acquired results of the open / closed state, and the determined set water level.

[0077] 10, when a specific field H is selected on the dam management screen 130, detailed information about the field H is displayed. Specifically, the dam management screen 130 displays the name of the field H, the field group G described below, the set water level, the current water level, the water supply valve opening degree, the water temperature, the drainage mode (whether it is normal mode or dam mode), the current drainage height, the name of the drainage device 33, the drainage height at the time of dam preparation, and the drainage height at the time of dam storage.

[0078] When displaying the detailed information, the water management server 28 acquires from the storage device, among the set water level etc., the field group G, drainage mode, dam preparation drainage level, and dam storage drainage level. The water management server 28 also acquires the remaining information (set water level, current water level, etc.) from the field management server 36. The water management server 28 displays the detailed information on the dam management screen 130 based on the acquired results.

[0079] By displaying the dam management screen 130 configured as described above, the user can grasp the state of the field H and easily decide whether to switch between the normal mode and the dam mode.

[0080] 9 and 10 is an example, and the information displayed on the dam management screen 130 can be changed as desired. For example, the water levels of the drainage channel 24c, the main river R1, and the tributary R2 can also be displayed on the dam management screen 130. When displaying the water levels of the main river R1 and the tributary R2 in this way, it is also possible to display the preparation water level (for example, the water level at which a flood defense unit is dispatched), the danger water level, and the flood danger water level together.

[0081] The dam management screen 130 can also display the storage volume of field H (the value obtained by multiplying the current water level of field H by the area of ​​field H) along with the current water level of field H. The dam management screen 130 can also display the storage volume by block (such as a group of fields connected to the same water distribution device 24) or by the entire river basin.

[0082] The dam management screen 130 can also display a storage ratio that indicates how much water is stored in the field H that has been switched to dam mode. The storage ratio can be calculated, for example, by dividing the current water level of the field H by the "drainage height during storage in dam." The storage ratio can also be aggregated and displayed for the entire block or watershed. The dam management screen 130 can also display the storage ratio in different colors depending on the size of the storage ratio. Specifically, the dam management screen 130 can display a storage ratio in yellow if it exceeds "50%" and in red if it exceeds "75%."

[0083] Furthermore, the dam management screen 130 may display the water supply status under normal circumstances (when the weather is stable). For example, the dam management screen 130 may display the reduced water depth (how much the water level decreases per unit time) in addition to the set water level and current water level described above, and may display the water demand calculated from the set water level. The dam management screen 130 may also display the demand in a predetermined unit (for example, for each field H, block, and watershed (irrigation water, head works, dam, pumping station, main line (distribution pipe 23a), branch line (distribution pipe 24a))).

[0084] The operation screen 140 shown in FIG. 11 is a screen for switching between normal mode and dam mode. The operation screen 140 is displayed by selecting the character string "Overall monitoring" in the first frame 101 and the character string "Rice field dam operation" in the second frame 102. On the operation screen 140, it is possible to switch between normal mode and dam mode for each field group G (see FIG. 17). Note that a field group G is a collection of fields H. A field group G includes at least one field H. A plurality of field groups G are set and stored in the storage device of the water management server 28. The operation screen 140 includes a mode selection section 141 and a status display section 142.

[0085] The mode selection unit 141 is a part that selects a switching mode for switching between a normal mode and a dumb mode. The switching modes include an automatic mode and a manual mode.

[0086] The automatic mode is a mode in which normal mode and dam mode are automatically switched in a set order. In the automatic mode, the modes of the field groups G are switched in sequence at regular time intervals (with a time difference). The manual mode is a mode in which the modes of multiple field groups G are switched by manual operation by the user. The mode selection unit 141 is provided with an automatic button 141a, a dam mode button 141b, a normal mode button 141c, and a manual button 141d as buttons for operating in such automatic mode and manual mode.

[0087] The automatic button 141a, the dam mode button 141b, and the normal mode button 141c are buttons for switching between the normal mode and the dam mode in the automatic mode. When the automatic button 141a is pressed, the dam mode button 141b and the normal mode button 141c become pressable (see FIG. 11). By pressing the dam mode button 141b, the user can automatically switch the field group G to the dam mode. Also, by pressing the normal mode button 141c, the user can automatically switch the field group G to the normal mode. The flow of mode switching in the automatic mode will be described later.

[0088] The manual button 141d is a button for switching whether or not an operation can be performed on the status display section 142, which will be described later. The user can perform an operation on the status display section 142 by pressing the manual button 141d.

[0089] Furthermore, the user can temporarily stop the mode switching process in the automatic mode (the automatic damming process and the automatic return process described below) by pressing the manual button 141d during the process. After temporarily stopping the process, the user can resume the switching to the dam mode, etc., in the automatic mode by pressing the dam mode button 141b or the normal mode button 141c. On the other hand, after temporarily stopping the process, the user can also arbitrarily switch the state (mode) of the field group G by manual operation. In this way, for example, when the user accidentally presses the dam mode button 141b, etc., the user can emergency stop the mode switching process, and then arbitrarily switch to a desired mode.

[0090] Furthermore, the mode selection unit 141 is provided with lamps 141e corresponding to the various buttons (such as the automatic button 141a). The lamps 141e indicate which mode is currently selected. The lamps 141e are provided above the various buttons, and operate in response to the operation of the various buttons. Specifically, as shown in Figs. 11 and 12, the lamps 141e are turned on when the corresponding button (below the lamps 141e) is pressed, and are turned off when the non-corresponding button is pressed.

[0091] The status display unit 142 displays the current status of each field group G. Furthermore, in manual mode, the status display unit 142 is used to manually switch between normal mode and dam mode. The status display unit 142 displays a list of "control order," "group name," "status," and "manual operation" for each field group G.

[0092] The "control order" indicates the order of the field groups G that are switched in the automatic mode. The "group name" is a character string that indicates the name of the field group G.

[0093] "Status" indicates the state of the field group G. The states of the field group G include "Normal", which indicates that it is in normal mode, "Dam preparation (draining)", which indicates that it has switched to dam mode and is temporarily draining (the drainage height is the "drainage height during dam preparation"), and "Dam", which indicates that the drainage height has risen in dam mode (the drainage height is the "drainage height during dam storage").

[0094] The above-mentioned “control order”, “group name”, and “status” are stored in the storage device of the water management server 28.

[0095] "Manual operation" allows the user to switch between normal mode and dam mode. "Manual operation" includes the drain button 142a, the storage button 142b, and the normal button 142c. When the drain button 142a etc. is pressed, the water management server 28 transmits information identifying the drainage device 33 of the field group G corresponding to that button (in the same row), information for changing the drainage height, etc. to the field management server 36. This allows the water management server 28 to switch between normal mode and drainage mode in response to the user's operation. The functions of the various buttons will be explained in detail below.

[0096] The drain button 142a is a button for performing temporary drainage in the dam mode. When the drain button 142a is pressed, the drainage height of the field group G is changed to the "dam preparation drainage height". This allows temporary drainage of the field H. When the drain button 142a is pressed, water supply by the water supply device 31 is stopped. As shown in FIG. 12, the drain button 142a can be pressed when the field group G is in the normal mode (the "status" is "normal").

[0097] The storage button 142b is a button for increasing the drainage height. When the storage button 142b is pressed, the drainage height of the field group G is changed to the "drainage height during dam storage". This allows a large amount of water to be stored in the field H. The storage button 142b can be pressed when the field group G is temporarily draining (the "status" is "Dam preparation (draining)").

[0098] The normal button 142c is a button for switching to normal mode. When the normal button 142c is pressed, the drainage height of the field group G is changed to the "normal drainage height." Furthermore, when the normal button 142c is pressed, water supply by the water supply device 31 is resumed. The normal button 142c can be pressed when the field group G is in dam mode (when the "status" is "preparing to dam (draining)" or "dam").

[0099] The user can manually switch between the normal mode and the dam mode by pressing the drain button 142a etc. as described above at an appropriate timing. For example, when it becomes necessary to urgently store precipitation in the field H due to sudden rainfall or rising river levels, the user can switch from the normal mode to the dam mode without performing pre-drainage by pressing the drain button 142a and the storage button 142b in succession (pressing the drain button 142a and then the storage button 142b immediately after pressing the drain button 142a). In this way, the water management server 28 can essentially skip the process of temporarily draining the water of the field H in the manual mode. With this configuration, the user can quickly store precipitation in the field H as needed.

[0100] 11 and 12 are merely examples, and the configuration of the operation screen 140 can be changed as desired. For example, the storage button 142b is set to be pressable when the field group G is undergoing temporary drainage (when the "status" is "Dam preparation (draining)") (see FIG. 12), but it is also possible to set the button to be pressable when the field group G is in normal mode (when the "status" is "normal") in addition to during temporary drainage. With this configuration, when switching from normal mode to dam mode, the user can skip the process of temporarily draining the water of the field H by pressing the storage button 142b without pressing the drain button 142a.

[0101] The mode setting screen 150 shown in Fig. 13 is a screen for changing various settings related to switching between normal mode and dam mode. The mode setting screen 150 is displayed by selecting the character string "Overall monitoring" in the first frame 101 and the character string "Rice field dam setting" in the second frame 102. The mode setting screen 150 includes a control setting section 151, a group setting section 152, and a device setting section 153 (see Fig. 14).

[0102] The control setting unit 151 is a section for setting time. As described above, in the automatic mode, the modes of the field groups G are switched in sequence at regular time intervals. The control setting unit 151 can set such time intervals. Specifically, the time interval for switching to the dam mode can be set using the "drainage interval at transition to dam mode". In addition, the time interval for switching to the normal mode can be set using the "drainage interval at transition to normal mode". The set "drainage interval at transition to dam mode" and "drainage interval at transition to normal mode" are stored in the storage device of the water management server 28.

[0103] As described above, in the dam mode, the water in the field H is drained once. The control setting unit 151 can set the time for this temporary drainage. Specifically, the time for temporary drainage can be set in the "drainage time at transition to dam mode." As described above, the "drainage time at transition to dam mode" (set value) is stored in the storage device of the water management server 28.

[0104] The group setting unit 152 is a section for making settings related to the control of the field groups G. The group setting unit 152 displays a list of information related to the control of the field groups G. Specifically, the group setting unit 152 displays a list of "No.", "group name", "control order", and "deletion target" for each field group G.

[0105] "No." is a number indicating the row number. "Group name" and "Control order" are the same as those on the operation screen 140. In the group setting section 152, the values ​​of "Group name" and "Control order" can be set. "Delete target" sets whether or not to delete a field group G. Also, in the group setting section 152, a new field group G can be created by pressing the "Add row" button.

[0106] 14 is a section for setting the field water management system 30. The device setting section 153 displays a list of information related to the field water management system 30. Specifically, the device setting section 153 displays, for each field H, a list of "No.", "Area code", "Field code", "Field name", "Drainage height at dam preparation", "Drainage height at dam storage", "Drainage device name", "Drainage height", "Dam control group", "Area", and "Remarks".

[0107] "No." is a number indicating the row number. "District code" is a number used to identify the district to which field H belongs. "Field code" is a number used to identify field H. "Field name" is a string indicating the name of field H. "Drainage device name" is a string indicating the name of drainage device 33. Note that if multiple drainage devices 33 are installed in one field H, the name of one of the drainage devices 33 is displayed. "Drainage height" indicates the current drainage height. The water management server 28 can display the above-mentioned "district code" and "field code", etc., by obtaining information from the field management server 36.

[0108] "Dam control group" indicates which field group G the field H belongs to. "Area" indicates the area of ​​the field H. In the device setting unit 153, "Drainage height at dam preparation", "Drainage height at dam storage", "Dam control group", "Area", and "Notes" can be set.

[0109] By displaying the mode setting screen 150 configured as described above, the user can set the "drainage height during dam preparation" and the like to appropriate values. For example, the user can set the "drainage height during dam storage" to an appropriate value taking into consideration the height and strength of the levee. Specifically, if the levee strength is low or the levee maintenance state is poor, the "drainage height during dam storage" can be set to a value somewhat lower than the height of the levee, effectively preventing the levee from collapsing when switching to dam mode. The user can also set the "drainage height during dam preparation" and the "drainage height during dam storage" taking into consideration the growth stage of the crop (for example, the process of rice cultivation).

[0110] Specifically, the maximum drainage height (maximum drainage height) of field H suitable for growing crops is predefined for each variety and growth schedule. For example, it is known that during the young panicle formation stage, the drainage height is preferably 30 cm or less. Therefore, the user can set the "drainage height during dam storage" based on the maximum drainage height. In this case, the user can also set the "drainage height during dam storage" based on the maximum drainage height only when the crops in field H are in a growth stage that requires attention.

[0111] In addition, while the herbicide is being fixed, it is desirable not to lower the water level in the field H too much. Therefore, the user can set the "Drainage height during dam preparation" of the field H during the herbicide fixation to a relatively high value.

[0112] In addition, the water management server 28 can automatically set the “drainage level during dam preparation” and the “drainage level during dam storage” based on the crop growth stage as described above, in accordance with the growth schedule stored in the field management server 36.

[0113] Even if the "Drainage height during dam storage" is set, if heavy rainfall that could cause a severe disaster is predicted, flood control can be prioritized and rainwater can be stored up to the maximum water storage capacity of field H regardless of the value set by the user (Drainage height during dam storage). For example, it is also possible to configure the setting value of the "Drainage height during dam storage" to be automatically overwritten. It is also possible to configure the setting value of the "Drainage height during dam storage" to be overwritten by instructions from related organizations such as the local government.

[0114] It should be noted that the mode setting screen 150 shown in FIG. 13 and FIG. 14 is merely an example, and the configuration of the mode setting screen 150 can be changed arbitrarily.

[0115] The following describes the process of switching between the normal mode and the dam mode using the automatic mode of the above-mentioned operation screen 140. First, the automatic damming process for switching from the normal mode to the dam mode will be described. Note that in the following, it is assumed that the state of all field groups G is the normal mode at the start of the automatic damming process.

[0116] The automatic damming process is started when the dam mode button 141b shown in Fig. 11 is pressed. As shown in Fig. 15, when the automatic damming process is started, the water management server 28 proceeds to step S110.

[0117] In step S110, the water management server 28 selects a field group G to be switched to the dam mode. At this time, the water management server 28 selects one field group G with the highest priority (the smallest value of "control order" shown in FIG. 13) from among the field groups G. At this time, the water management server 28 excludes the field groups G already selected in the series of flows shown in FIG. 15, and selects the field group G with the highest priority from among the unselected field groups G. Note that if there is no unselected field group G, the water management server 28 does not select a field group G. When the processing of step S110 ends, the water management server 28 proceeds to step S120.

[0118] In step S120, the water management server 28 determines whether there is a field group G that is to be subjected to the processing in step S130 and subsequent steps described below. Specifically, the water management server 28 determines whether or not a field group G was selected in step S110. If a field group G could not be selected (step S120: No), the water management server 28 ends the automatic damming process. In this way, when all field groups G have been put into dam mode, the water management server 28 ends the automatic damming process. On the other hand, if a field group G was selected (step S120: Yes), the water management server 28 proceeds to step S130.

[0119] In step S130, the water management server 28 determines whether the "status" of the field H belonging to the field group G selected in step S110 is other than "dam." If the "status" of the field H is other than "dam" (if it is "normal" or "preparation for dam (draining)," step S130: Yes), the water management server 28 proceeds to step S140. On the other hand, if the "status" of the field H is "dam" (step S130: No), the water management server 28 proceeds to step S110. In this way, the water management server 28 does not perform the processes in and after step S140 for the field group G that has already been switched to dam mode in manual mode (the "status" is "dam"), and selects the field group G to be switched to dam mode next.

[0120] In step S140, the water management server 28 transmits a signal to the field management server 36 to close the water supply taps of the water supply devices 31 of each field H belonging to the field group G selected in step S110, and disables (disables) remote operation of the field water management system 30 by the owner terminal 35. When the processing of step S140 ends, the water management server 28 proceeds to step S150.

[0121] In step S150, the water management server 28 transmits a signal to the field management server 36 to change the drainage height of the drainage devices 33 installed in the fields H belonging to the field group G selected in step S110 to the "dam preparation drainage height". At this time, the water management server 28 changes the drainage height to the "dam preparation drainage height" set for each field H on the mode setting screen 150 (see FIG. 14). After completing the processing of step S150, the water management server 28 executes the processing of steps S160 and S170 and the processing of step S180 in parallel.

[0122] In step S160, the water management server 28 waits for the "drainage time during dam mode transition" set on the mode setting screen 150 (see FIG. 13) to elapse. After completing the process of step S160, the water management server 28 proceeds to step S170 and changes the drainage height of the drainage device 33 installed in the field H belonging to the field group G selected in step S110 to the "drainage height during dam storage." At this time, the water management server 28 changes the drainage height to the "drainage height during dam storage" set for each field H on the mode setting screen 150 (see FIG. 14).

[0123] Furthermore, in step S180, the water management server 28 waits for the “drainage interval at transition to dam mode” set on the mode setting screen 150 (see FIG. 13) to elapse. After completing the process of step S180, the water management server 28 proceeds to step S110 and switches the next field group G to the dam mode (the process of step S120 and subsequent steps).

[0124] In this manner, the water management server 28 switches to the dam mode for each field group G at different times.

[0125] A specific example of the automatic damming process will be described below with reference to Figs. 16 and 17. Note that the following description will be given by taking as an example a case where "controlled objects 1 to 3" are set to dam mode as a field group G. Also, "controlled objects 1 to 3" are assumed to be located downstream of tributary R2 in ascending order of numbers (see Fig. 17). Note that being located downstream means that the drainage channel 24c (see Fig. 1) of field H belonging to "controlled objects 1 to 3" is connected to the downstream side of tributary R2. Also, in the following description, it is assumed that the dam mode is switched to in the order of "controlled object 1," "controlled object 2," and "controlled object 3," as set in Fig. 13.

[0126] As shown in Fig. 16, "control objects 1 to 3" are switched to normal mode in the initial state before the automatic damming process is executed. When the automatic damming process is executed in this state, the water management server 28 changes the drainage height of the field H of "control object 1" which has the highest priority to the "dam preparation drainage height" as shown in Fig. 16 and Fig. 17(a) (step S110, step S120: Yes, step S130: Yes, steps S140 and S150). In this way, the water management server 28 first temporarily drains the water of the field H belonging to "control object 1".

[0127] When the "drainage interval at dam mode transition" has elapsed since drainage of "controlled object 1" began (step S180), the water management server 28 changes the drainage height of "controlled object 2," which has the second highest priority after "controlled object 1," to the "drainage height at dam preparation," as shown in Figures 16 and 17(b).

[0128] In addition, when the "drainage interval at dam mode transition" has elapsed since the start of drainage of "controlled object 2", the water management server 28 changes the drainage height of "controlled object 3" to the "drainage height at dam preparation", as shown in Figures 16 and 17(c).

[0129] When the "drainage time during dam mode transition" has elapsed since drainage of "controlled object 1" started (step S160), the water management server 28 changes the drainage height of "controlled object 1" to the "drainage height during dam storage" (step S170) as shown in Fig. 17(c). The water management server 28 also changes the drainage height of "controlled object 2" and "controlled object 3" to the "drainage height during dam storage" (not shown) in the same way as "controlled object 1".

[0130] With this configuration, the water management server 28 can shift the timing of draining water from the field H when switching to the dam mode. This makes it possible to prevent a large amount of water from flowing into the river (the main river R1 or the tributary R2) from the field H at once, thereby suppressing the flooding of the river.

[0131] In addition, by draining the water in order from the downstream side as shown in FIG. 17, the water drainage on the upstream side is less affected by the rise in water level caused by the water drainage on the downstream side, and the water drainage of the field H can be performed efficiently.

[0132] In the above explanation, an example was given in which the dam mode button 141b was pressed when all field groups G were in normal mode, but it is also conceivable that the button may be pressed while some field groups G are being automatically switched to normal mode (while the automatic return process described below is running), or when some field groups G have already been manually switched to dam mode. In this case, the water management server 28 stops any ongoing process (automatic return process), and sequentially switches to dam mode the field groups G whose drainage height is not set to the "drainage height during dam storage" through the automatic damming process.

[0133] Specifically, in the automatic damming process, if the "status" of the field group G selected in step S110 is "normal" or "preparation to dam (draining)", the water management server 28 proceeds to the process of step S140 (step S130: Yes) and changes the drainage height, etc. of the field group G (steps S140 to S180). In this way, the water management server 28 drains water from the field group G whose "status" is "preparation to dam (draining)" again until the "drainage time at transition to dam mode" has elapsed (executes step S160).

[0134] The following describes the automatic return process for switching from the dam mode to the normal mode by the automatic mode. Note that in the following, it is assumed that the state of all field groups G is the dam mode at the start of the automatic return process.

[0135] The automatic return process is started when the normal mode button 141c shown in Fig. 11 is pressed. As shown in Fig. 18, when the automatic return process is started, the water management server 28 performs steps S210 to S230, similar to steps S110 to S130 in the automatic damming process. In this way, the water management server 28 selects a field group G in the order set in the "control order" (see Fig. 13), and performs the processes from step S240 onwards if the "status" of a field H belonging to the selected field group G is other than "normal".

[0136] In step S240, the water management server 28 transmits a signal to the field management server 36 to open the water supply taps of the water supply devices 31 of each field H belonging to the field group G selected in step S210, and also enables (enables) remote operation of the field water management system 30 by the owner terminal 35. When the processing of step S240 ends, the water management server 28 proceeds to step S250.

[0137] In step S250, the water management server 28 transmits a signal to the field management server 36 to change the drainage height of the drainage devices 33 installed in the fields H belonging to the field group G selected in step S210 to the "normal drainage height." When the process of step S240 ends, the water management server 28 proceeds to step S260.

[0138] In step S260, the water management server 28 waits for the “drainage interval at transition to normal mode” set on the mode setting screen 150 (see FIG. 13) to elapse. After completing the process of step S260, the water management server 28 proceeds to step S210 and switches the next field group G to the normal mode (the process from step S220 onwards).

[0139] In this way, the water management server 28 switches to the normal mode for each field group G at different times.

[0140] A specific example of the automatic return process will be described below with reference to Figs. 19 and 20. Note that the following will be described as an example in which "controlled objects 1 to 3" are set to normal mode as field group G. Also, it is assumed that "controlled objects 1 to 3" are located downstream of tributary R2 in ascending order of numbers (see Fig. 20). It is assumed that "controlled object 1," "controlled object 2," and "controlled object 3" are set to normal mode in this order, as set in Fig. 13.

[0141] As shown in Fig. 19, "controlled objects 1 to 3" are switched to the dam mode in the initial state before the automatic return process is executed. When the automatic return process is executed in this state, the water management server 28 changes the drainage height of the field H of "controlled object 1" with the highest priority to the "normal drainage height" as shown in Figs. 19 and 20(a) (step S210, step S220: Yes, step S230: Yes, steps S240 and S250). In this way, the water management server 28 first returns "controlled object 1" to the normal mode. This allows the water management server 28 to drain water from the fields H of the field group G belonging to "controlled object 1" among the fields H whose water level has risen due to heavy rain.

[0142] When the "drainage interval at transition to normal mode" has elapsed since "controlled object 1" was returned to normal mode (step S260), the water management server 28 changes the drainage height of "controlled object 2," which has the second highest priority after "controlled object 1," to the "normal drainage height," as shown in Figures 19 and 20(b).

[0143] In addition, when the "drainage interval at transition to normal mode" has elapsed since "controlled object 2" was returned to normal mode, the water management server 28 changes the drainage height of "controlled object 3" to the "normal drainage height" as shown in Figures 19 and 20(c).

[0144] With this configuration, it is possible to shift the timing of draining water from the field H when switching to the normal mode. This makes it possible to prevent a large amount of water from flowing into the river (main river R1 or tributary R2) from the field H all at once, thereby suppressing the flooding of the river.

[0145] In addition, by draining the water in order from the downstream side as shown in FIG. 20, the water drainage on the upstream side is less affected by the rise in water level caused by the water drainage on the downstream side, and the water drainage of the field H can be performed efficiently.

[0146] In the above explanation, an example was given in which the normal mode button 141c was pressed when all field groups G were in the dam mode, but it is also conceivable that the button may be pressed while some field groups G are being automatically switched to the dam mode (while the automatic damming process is being executed), or when some field groups G have already been switched to the normal mode by manual operation. In this case, the water management server 28 stops any ongoing process (automatic damming process) and sequentially switches the field groups G that have not been returned to the normal mode by the automatic return process to the normal mode.

[0147] Specifically, in the automatic return process, if the "status" of the field group G selected in step S210 is "Dam preparation (draining)" or "Dam", the water management server 28 proceeds to processing of step S240 (step S230: Yes) and changes the drainage height, etc. of the field group G (steps S240 to S260).

[0148] As described above, the field water storage system 10 of this embodiment is a field water storage system 10 equipped with a water management server 28 (control unit) capable of controlling the water supply device 31 and the drainage device 33 (field water management devices) that manage the water supply and drainage of the field H, and the water management server 28 has, as control modes for controlling the water supply device 31 and the drainage device 33, a normal mode (first mode) that adjusts the drainage height of the field H in accordance with predetermined conditions (in this embodiment, crop growth), and a dam mode (second mode) that sets the drainage height of the field H higher than the drainage height in the normal mode ("normal drainage height") regardless of the predetermined conditions, thereby making it possible to store a larger amount of water in the field H than in the normal mode.

[0149] With this configuration, by switching the control mode to the dam mode, a larger amount of water can be stored in the field H compared to the normal mode. This makes it possible to use the field H as a dam and suppress rising water levels and flooding of rivers due to heavy rain, etc.

[0150] In addition, in the dam mode, the water management server 28 sets the drainage height of the field H to a first drainage height ("drainage height during dam preparation") and drains the water from the field H, and then sets the drainage height of the field H to a second drainage height ("drainage height during dam storage") that is higher than the first drainage height (see Figure 16).

[0151] In this way, by temporarily draining the water in the field H, a larger amount of water can be stored in the field H.

[0152] The water management server 28 is capable of setting a plurality of field groups G, each including at least one field H (see FIG. 14), and is also capable of switching the control mode for each field group G (see FIGS. 17 and 20).

[0153] In this way, management of water supply and drainage can be simplified by dividing a plurality of fields H into a plurality of field groups G and switching the control mode for each field group G. For example, the control mode of a plurality of fields H with similar environments (such as a plurality of fields H connected to the same water distribution device 24) can be switched collectively to facilitate management of water supply and drainage.

[0154] In addition, the water management server 28 has switching modes for switching the control modes, including an automatic mode in which the control modes of the multiple field groups G are automatically switched in a set order, and a manual mode in which the control modes of the multiple field groups G are switched by manual operation by the user (see Figures 11 and 12).

[0155] With this configuration, convenience can be improved by selectively using an automatic mode in which the control mode is automatically switched and a manual mode in which the control mode is manually switched.

[0156] Moreover, in the automatic mode, the water management server 28 switches the control mode in accordance with a predetermined set time (see FIG. 16). In addition, the set times in this embodiment include a "drainage time at dam mode transition" that specifies the time for draining the water from field H, a "drainage interval at dam mode transition" that specifies the time difference between field groups G for switching to dam mode, and a "drainage interval at normal mode transition" that specifies the time difference between field groups G for switching to normal mode.

[0157] With this configuration, the control mode can be appropriately switched in accordance with a preset set time.

[0158] Moreover, the water management server 28 is capable of changing the set time (see FIG. 13).

[0159] By configuring in this way, it is possible to more appropriately switch the control mode. For example, by arbitrarily changing the set time according to the size of the river, it is possible to effectively suppress the rise and flooding of the river.

[0160] In addition, the water management server 28 is capable of changing the first drainage height in the dam mode ("drainage height during dam preparation") and / or the second drainage height ("drainage height during dam storage") for each field H (see Figure 14).

[0161] By configuring in this manner, an appropriate drainage height can be set according to the field H.

[0162] The water supply device 31 and the drainage device 33 according to this embodiment are one embodiment of the field water management device according to the present invention. The water management server 28 according to this embodiment is an embodiment of a control unit according to the present invention.

[0163] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0164] For example, the water management server 28 is not particularly limited in its configuration (cloud server, on-premise server, etc.) as long as it can control the water supply device 31 and the drainage device 33. Also, the farm land management server 36 is a cloud server, but is not limited to this and may be an on-premise server.

[0165] In addition, in the present embodiment, an example has been shown in which the field water storage system 10 itself includes the field water management system 30 that supplies and drains water to and from each field H, but the present invention is not limited to this. For example, the field water storage system 10 can also cooperate with a field water management system 30 provided separately outside to utilize the field H as a dam. The field water storage system 10 may also be one that starts up the normal mode and the dam mode through API cooperation with a monitoring system (a system different from the irrigation water management system 20) that manages a drainage pumping station, drainage gates, etc.

[0166] In addition, the control of the drainage device 33 in the dam mode (the process of setting the drainage height to the "drainage height during dam preparation" and the "drainage height during dam storage") is performed by the water management server 28, but the device that controls the drainage device 33 is not particularly limited. The control of the drainage device 33 may be performed by the monitoring system through API linkage, for example.

[0167] In addition, the set values ​​of "Dam preparation drainage height" and "Dam storage drainage height" are changed by the water management server 28 (mode setting screen 150 shown in FIG. 14), but the device that changes the set values ​​is not particularly limited. The set values ​​may be changed by the monitoring system through API linkage, for example.

[0168] In addition, in the normal mode, the drainage height is adjusted taking into account the growth of the crops, but the indicator used as the basis for adjusting the drainage height in the normal mode is not limited to the growth of the crops and can be changed as desired.

[0169] In addition, in this embodiment, the normal mode and the dam mode are switched for each field group G, but the unit for switching between the normal mode and the dam mode is not limited to the field group G and can be changed arbitrarily. For example, the normal mode and the dam mode may be switched for each field H.

[0170] In addition, in the dam mode, the water in the field H is once drained, but this is not limited to the above. That is, in the dam mode, the water in the field H may be raised without once being drained.

[0171] In the present embodiment, the normal mode and the dam mode can be switched automatically and manually, but the present invention is not limited to this, and the farm field water storage system 10 may be configured to switch modes only automatically (equipped with only the automatic mode). The farm field water storage system 10 may be configured to switch modes only manually (equipped with only the manual mode).

[0172] In addition, in the automatic mode, the modes of the multiple field groups G are switched with a time lag; however, this is not limited to this, and the modes of the multiple field groups G may be switched simultaneously.

[0173] In addition, in this embodiment, the user can arbitrarily set information regarding the mode (such as "drainage interval at dam mode transition" and "drainage height at dam storage"), but this is not limited to this, and the information regarding the mode may be set in advance.

[0174] In addition, the automatic mode is switched to the dam mode when the dam mode button 141b on the operation screen 140 is pressed, but the timing of switching to the dam mode is not particularly limited and can be changed arbitrarily. For example, the switching to the dam mode may be automatically performed when the rainfall forecast is equal to or greater than a preset threshold. Also, when the rainfall forecast is equal to or greater than a preset threshold, it is possible to inquire of the user whether to switch to the dam mode. Specifically, the water management server 28 displays a pop-up including a confirmation message (for example, a message saying "Heavy rain of xx mm is predicted. Do you want to start the rice field dam?") and a start button. Also, when the user presses the start button, the water management server 28 switches to the dam mode.

[0175] Furthermore, before switching to the dam mode, the water management server 28 can inquire not only of the user but also of the relevant parties of the field H (for example, the head of an agricultural association). In this case, if the relevant parties agree to the execution, the water management server 28 executes the switching to the dam mode for the fields H in the area of ​​the relevant parties who agreed to the execution or for all fields H. At this time, the execution condition can include that the water levels of the drainage channel 24c and the river are below a specified water level. Furthermore, the water levels of the drainage channel 24c and the river can be displayed when inquiring of the relevant parties.

[0176] In addition, the water management server 28 switches between the normal mode and the dam mode in sequence based on the time that has elapsed since the drainage height was lowered, but the index used for switching the modes is not limited to this. For example, the water management server 28 may switch between the modes in sequence according to a predetermined water level that has been set in advance. Specifically, the water management server 28 may start switching the mode for the next field group G when the water level of the field H in a predetermined field group G drops to half (or one-third or one-fifth). The water management server 28 may also start switching the mode for the next field group G when the water level of the drainage channel 24c or the river has not risen (is below a predetermined threshold).

[0177] Here, in the dam mode of this embodiment, the water in the field H is drained once. For this reason, when returning from the dam mode to the normal mode in the event that heavy rain does not fall (the weather forecast is incorrect), it is necessary to supply a large amount of water to the field H. However, since there is a limit to the amount of water that can be supplied to the field H, the water level in the field H may not return to normal immediately even when the mode is returned to the normal mode.

[0178] In order to avoid such a situation, the water management server 28 may be configured to have an intermediate mode in addition to the dam mode and normal mode. In the intermediate mode, the amount of water in the field H that is temporarily drained is less than in the dam mode. In the intermediate mode, the water in the field H is temporarily drained to an extent that the water level in the field H can be quickly restored (for example, to an extent that can be restored in one day). The drainage height of the field H at this time is set to a value that is lower than the "normal drainage height" and higher than the "dam preparation drainage height". In the intermediate mode, after the water in the field H is temporarily drained, the drainage height is changed to the "dam storage drainage height". By executing such an intermediate mode, the water management server 28 can quickly restore the water level of the field H when there is no heavy rain.

[0179] In this embodiment, the fields H are grouped (setting which field group G a certain field H belongs to) by manual operation by the user (see FIG. 14), but the present invention is not limited to this. For example, the fields H may be grouped automatically by the irrigation water management server 28. In this case, the irrigation water management server 28 can group the fields H according to, for example, any arbitrary criterion. Such criteria include the area of ​​the field H, the position of the field H relative to the tributary R2 (upstream, downstream), and the growth status of the crops. Moreover, the irrigation water management server 28 can display the criterion on the mode setting screen 150 so that the criterion can be selected arbitrarily.

[0180] When grouping the fields H according to their areas, the water management server 28 can, for example, group the fields H in descending order of area, or group the fields H so that the total areas of the fields H belonging to each field group G are approximately equal. When grouping the fields H according to their positions relative to the tributary R2, the water management server 28 can, for example, automatically group the fields H in ascending order of areas connected to the upstream side (or downstream side) of the tributary R2. When grouping the fields H according to the growth conditions of crops, the water management server 28 can, for example, group the fields H according to areas having similar growth conditions.

[0181] In this embodiment, the "control order" (priority of mode switching in automatic mode) of the field group G is set by manual operation by the user (see FIG. 13), but the present invention is not limited to this. For example, the "control order" may be set automatically by the irrigation water management server 28 according to any judgment criterion (e.g., the position of the field H relative to the tributary R2, etc.). Specifically, the irrigation water management server 28 can set the "control order" so that the field group G connected to the downstream side of the tributary R2 has a higher priority. [Explanation of symbols]

[0182] 10. Field Water Storage System 28 Water Management Server 31 Water supply equipment 33 Drainage system H Field

Claims

1. A field water storage system including a control unit capable of controlling a field water management device that manages water supply and drainage in a field, The control unit is As a control mode for controlling the field water management device, a first mode for adjusting the drainage height of the field according to predetermined conditions; a second mode in which a drainage height of the field is set higher than the drainage height in the first mode regardless of the predetermined conditions, thereby allowing a larger amount of water to be stored in the field than in the first mode; Equipped with in the second mode, after setting a drainage height of the field to a first drainage height and draining water from the field once, setting a drainage height of the field to a second drainage height higher than the first drainage height; A plurality of field groups can be set by dividing fields into groups in advance, and the control mode can be switched for each of the field groups; The control unit is As a switching mode for switching the control mode, an automatic mode in which the control modes of the plurality of field groups are automatically switched in a set sequence; a manual mode in which the control modes of the plurality of field groups are switched by a manual operation of a user; Equipped with In the automatic mode, the control mode is switched in accordance with a predetermined set time. Field water storage systems.

2. The control unit is The set time is changeable. The field water storage system according to claim 1.

3. A field water storage system having a control unit capable of controlling a field water management device that manages water supply and drainage in a field, The control unit is As a control mode for controlling the field water management device, a first mode for adjusting the drainage height of the field according to predetermined conditions; a second mode in which a drainage height of the field is set higher than the drainage height in the first mode regardless of the predetermined conditions, thereby allowing a larger amount of water to be stored in the field than in the first mode; Equipped with in the second mode, after setting a drainage height of the field to a first drainage height and draining water from the field once, setting a drainage height of the field to a second drainage height higher than the first drainage height; A plurality of field groups can be set by dividing fields into groups in advance, and the control mode can be switched for each of the field groups; The control unit is The first drainage height and / or the second drainage height in the second mode can be changed for each field. Field water storage systems.

4. A field water storage system having a control unit capable of controlling a field water management device that manages water supply and drainage in a field, The control unit is As a control mode for controlling the field water management device, a first mode for adjusting the drainage height of the field according to predetermined conditions; a second mode in which a drainage height of the field is set higher than the drainage height in the first mode regardless of the predetermined conditions, thereby allowing a larger amount of water to be stored in the field than in the first mode; Equipped with in the second mode, after setting a drainage height of the field to a first drainage height and draining water from the field once, setting a drainage height of the field to a second drainage height higher than the first drainage height; A plurality of field groups can be set by dividing fields into groups in advance, and the control mode can be switched for each of the field groups; As a switching mode for switching the control mode, an automatic mode in which the control modes of the plurality of field groups are automatically switched in a set sequence; a manual mode in which the control modes of the plurality of field groups are switched by a manual operation of a user; Equipped with In the automatic mode, the control mode is switched in accordance with a predetermined set time. Field water storage systems.

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