Farm 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 the technology of a field water storage system for storing water in a field.

Background Art

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

[0003] The automatic water management device (field water storage system) described in Patent Document 1 includes a water supply pump and a drainage pump for supplying and draining water in the field, a water level controller for controlling 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 a water level suitable 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 the field. Therefore, it is conceivable to suppress the inflow of rainwater into the river by storing rainwater in the field when heavy rain occurs, and thereby suppress the rise and flooding of the river. For this reason, a technology that can suppress the rise of the river and the like by utilizing the field is expected.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made in view of the above circumstances, and the problem to be solved is to provide a field water storage system capable of suppressing the rise and flooding of a river due to heavy rain or the like.

Means for Solving the Problems

[0007] The problem to be solved by the present invention is as described above. Next, means for solving this problem will be described.

[0008] That is, in claim 1, a field water storage system including a control unit capable of controlling a field water management device for managing water supply and drainage in a field, wherein the control unit, as a control mode for controlling the field water management device, has a first mode of adjusting the drainage height of the field according to a predetermined condition, and after setting the drainage height of the field to a first drainage height and once draining the water in the field, setting the drainage height of the field to a second drainage height higher than the first drainage height, and enabling the storage of a larger amount of water in the field than in the first mode; and a third mode of setting the drainage height of the field to a third drainage height higher than the first drainage height, once draining the water in the field, and then setting the drainage height of the field to a fourth drainage height higher than the third drainage height, and enabling the storage of a larger amount of water in the field than in the first mode.

[0009] In claim 2, the switching between the second mode and the third mode is performed based on weather information.

[0010] In claim 3, the fourth drainage height in the third mode is the same as the second drainage height in the second mode.

Effect of the Invention

[0011] As an effect of the present invention, the following effects are achieved.

[0012] In the present invention, by switching the control mode to the second mode or the third mode, a larger amount of water can be stored in the field compared to the first mode. Thereby, the field can be used as a dam to suppress the increase in water level and flooding of rivers due to heavy rain or the like. Also, by draining the water in the field once, a larger amount of water can be stored in the field.

Brief Description of the Drawings

[0013]

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Embodiments for Carrying Out the Invention

[0014] Hereinafter, a field water storage system 10 according to an embodiment of the present invention will be described.

[0015] The field water storage system 10 shown in FIG. 1 is for storing precipitation in the field H when heavy rain falls or the like to suppress the increase in water level and flooding of the river. The field water storage system 10 includes a water use management system 20 and a field water management system 30.

[0016] The water use management system 20 is for managing the water (irrigation water) supplied from the water source to the field H. The water use management system 20 includes a water intake 21, a first pump 22, a water distribution tank 23, a water distribution device 24, a second pump 25, a drainage gate 26, a user terminal 27, and a water use management server 28.

[0017] The water intake 21 is for taking water from a water source (in this embodiment, the main river R1) into an agricultural water channel.

[0018] The first pump 22 is for pumping up the water taken in from the water intake 21 and supplying it to the water distribution tank 23.

[0019] The water distribution tank 23 is for storing the water to be supplied to the field H. The water distribution tank 23 is connected to a plurality of water distribution devices 24 via a water distribution pipe 23a. The water stored in the water distribution tank 23 is sent to the water distribution device 24 via the water distribution pipe 23a.

[0020] The water distribution device 24 is for adjusting the amount of water supplied to the water supply pipe 24b for supplying water to the farmland H. The water distribution device 24 is connected to a plurality of farmlands H via the distribution pipe 24a and a plurality of water supply pipes 24b connected to the distribution pipe 24a. The water sent to the water distribution device 24 is sent to the water supply pipe 24b via the distribution pipe 24a, and is appropriately supplied to the farmland H by the farmland water management system 30 described later. Also, the water supplied to the farmland H is appropriately discharged from the farmland H by the farmland water management system 30, and is sent to the branch river (tributary river) R2 via the drainage channel 24c.

[0021] The second pump 25 is for sending the water in the branch river R2 to the main river R1 via the drainage gate 26. The second pump 25 is provided on the downstream side of the branch river R2 (the side closer to the main river R1).

[0022] The drainage gate 26 is for preventing the backflow of water from the main river R1 to the branch river 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 branch river R2.

[0023] The user terminal 27 is a terminal used by a user (a person who manages irrigation water using the farmland water storage system 10). The user terminal 27 includes an arithmetic device capable of executing arithmetic processing, a storage device storing programs and the like, an input device capable of inputting information, and an output device capable of displaying the results of arithmetic processing and the like. The user terminal 27 is configured by a personal computer, a smartphone, or the like.

[0024] The water management server 28 shown in FIGS. 1 to 3 performs various processes. The water management server 28 includes an arithmetic device capable of executing arithmetic processing, a storage device storing programs and the like, 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 and the like. Thereby, the water management server 28 can control the first pump 22 and the like.

[0025] Also, the water use management server 28 of the present embodiment is connected to the user terminal 27 and can exchange information with the user terminal 27. The user can control the first pump 22 and the like by operating the user terminal 27 to send a predetermined signal to the water use management server 28, and can arbitrarily determine the water level in the water storage tank 23, the water supply amount in the water supply pipe 24b, the timing of flowing water from the branch river R2 to the main river R1, and the like.

[0026] The farm water management system 30 is for performing water supply and drainage for each farm H. As shown in FIG. 2, the farm water management system 30 includes a water supply device 31, a water level and water temperature sensor 32, a drainage device 33, a communication relay 34, an owner terminal 35, a farm management server 36, and a data center 37.

[0027] The water supply device 31 is for managing the water supply to the farm H. The water supply device 31 is provided in each farm H. The water supply device 31 includes communication equipment for communicating with the communication relay 34 described later, and a water supply faucet provided in a water channel connecting the water supply pipe 24b and the farm H (not shown). The water supply device 31 can switch between a state where water can be supplied to the farm H and a state where water cannot be supplied by opening and closing the water supply faucet. Also, the water supply device 31 can adjust the water supply amount to the farm H according to the opening degree of the water supply faucet.

[0028] The water level and water temperature sensor 32 is for measuring the water level and water temperature of the farm H. The water level and water temperature sensor 32 is provided in each farm H. The water level and water temperature sensor 32 is connected to the water supply device 31 and can transmit the measurement results of the water level and water temperature to the water supply device 31.

[0029] The drainage device 33 is for managing the drainage of the farmland H. The drainage device 33 is provided for each farmland H. The drainage device 33 includes communication equipment (not shown) for communicating with the communication relay device 34, and a lifting body 33a (see Fig. 16) provided at the drainage outlet of the farmland H. The drainage device 33 discharges the water in the farmland H that has exceeded the lifting body 33a into the drainage channel 24c. In this way, in the farmland H, water can be stored up to the water level that is the same height as the height position (the height position of the upper surface) of the lifting body 33a. Hereinafter, the height position of such a lifting body 33a (the water level that can be stored in the farmland H) will be referred to as the "drainage height".

[0030] The communication relay device 34 is a device capable of wireless communication. The communication relay device 34 can exchange information with the water supply device 31, the drainage device 33, and a farmland management server 36 described later by wireless communication.

[0031] The owner terminal 35 is a terminal owned by the owner of the farmland H. The owner terminal 35 includes an arithmetic device capable of executing arithmetic processing, a storage device storing programs and the like, an input device capable of inputting information, and an output device capable of displaying the results of arithmetic processing and the like. The owner terminal 35 is configured by a smartphone, a personal computer, or the like.

[0032] The farmland management server 36 is for performing processing related to the water supply and drainage of the farmland H. The farmland management server 36 is configured by a cloud server (strictly speaking, a server virtually constructed in the cloud server). The farmland management server 36 can exchange information with the water supply device 31 and the drainage device 33 via the communication relay device 34. The farmland management server 36 can acquire various information by receiving signals from the water supply device 31 and the drainage device 33. For example, the farmland management server 36 can acquire the opening degree of the water supply faucet, the measurement results of the water level and water temperature sensor 32, etc. based on the signal from the water supply device 31. Also, the farmland management server 36 can acquire the current drainage height and the like based on the signal from the drainage device 33.

[0033] In addition, the farm management server 36 can control the water supply and drainage of the farm H by transmitting signals to the water supply device 31 and the drainage device 33. For example, the farm management server 36 can open and close the water supply faucet by transmitting a signal to the water supply device 31, and can switch between a state where water can be supplied to the farm H and a state where water cannot be supplied, and can adjust the opening degree of the water supply faucet. In addition, the farm management server 36 can change the drainage height by transmitting a signal to the drainage device 33. The farm management server 36 can adjust the water level of the farm H by controlling the water supply and drainage in this way.

[0034] In addition, the farm management server 36 can exchange information with the owner terminal 35 via the Internet line or the like. The owner can operate the owner terminal 35 to receive a signal from the farm management server 36 and check the water level of the farm H and the like. In addition, the owner can operate the owner terminal 35 to transmit a signal to the farm management server 36 and remotely operate the water supply and drainage of the farm H.

[0035] The data center 37 is a facility for storing various information related to the farm H and the farm water management system 30. The data center 37 is provided with a storage device (for example, a large-capacity storage) for storing information, and the measurement results of the water level and water temperature sensor 32 and the history of changing the drainage height are stored in the storage device. In the data center 37, the information transmitted from the farm management server 36 can be stored in the storage device. In addition, in the data center 37, when a request is received from the farm management server 36, the information stored in the storage device can be transmitted to the farm management server 36.

[0036] The water management server 28 of the farm water storage system 10 configured as described above is connected to the farm management server 36 and can exchange information with the farm management server 36. The water management server 28 can acquire various information from the farm water management system 30 by receiving a signal from the farm management server 36. Specifically, the water management server 28 can acquire information such as the opening degree of the water supply faucet, the water level and water temperature of the farm H, and the current drainage height.

[0037] 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.

[0038] The normal mode is a mode for adjusting the drainage height according to predetermined conditions. The normal mode is mainly executed when the weather is stable. In the normal mode, the water supply amount to the field H and the drainage height are adjusted so that the water level (set water level) suitable for the growth of the crops in the field H is obtained. The adjustment of the water supply amount and the like in the normal mode is performed by the field management server 36. Specifically, the field management server 36 determines the water supply amount and the drainage height based on the variety and growth status of the crops, and automatically adjusts the water supply amount and the drainage height based on the determination result. Hereinafter, the drainage height in the normal mode is referred to as the "normal drainage height". The "normal drainage height" is set in advance based on the variety and growth status of the crops, and the set value is stored in the storage device of the field management server 36. In addition, the set value can be arbitrarily changed by the owner of the field H by operating the owner terminal 35.

[0039] When the water management server 28 executes the normal mode, it transmits a signal instructing the execution of the normal mode to the field management server 36. Thus, the adjustment of the water supply amount and the drainage height in the normal mode is performed by the field management server 36 or the owner.

[0040] Different from the normal mode, the dam mode is a mode that enables a larger amount of water to be stored in the field H regardless of the growth status of the crops (predetermined conditions). The dam mode is executed when the weather is expected to be unstable (such as in the case of a heavy rain forecast). In the dam mode, the water supply is stopped and the drainage height is set to a drainage height higher than the "normal drainage height". The control of the water supply and the drainage height in the dam mode is performed by the water management server 28.

[0041] Specifically, the water management server 28 transmits signals regarding the opening degree of the water supply faucet and the drainage height to the farm management server 36. The farm 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 water supply amount to the farm H and the drainage height in the dam mode. In the dam mode of this embodiment, as will be described later, after the drainage height is once lowered, it is finally set to a drainage height higher than the "normal drainage height". Hereinafter, the drainage height higher than such "normal drainage height" is referred to as "drainage height during dam storage". The "drainage height during dam storage" is set in advance, and the set value is stored in the storage device of the water management server 28.

[0042] By executing the dam mode, the water management server 28 can suppress the increase in water level and flooding of the river by using the farm H as a substitute for the dam when heavy rain occurs.

[0043] FIG. 4 is a diagram showing an example of the flow of suppressing the increase in water level and flooding of the river by the dam mode. Hereinafter, the outline of the flow shown in FIG. 4 will be described with reference to FIGS. 2 and 4.

[0044] The user determines whether to switch from the normal mode to the dam mode when heavy rain is predicted. When the user determines 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).

[0045] The water management server 28 stops the water supply to the farm H by the water supply device 31 and changes the drainage height of the drainage device 33 to a drainage height lower than the "normal drainage height" (step S20). The water management server 28 maintains this state for a predetermined time. Thereby, the water management server 28 drains the water in the farm H once and secures the capacity of the water that can be stored in the farm H before heavy rain falls.

[0046] Hereinafter, the drainage height when temporarily draining the water in the field H is referred to as the "drainage height at the time of dam preparation". Also hereinafter, the time for temporarily draining the water (the time for maintaining the "drainage height at the time of dam preparation") is referred to as the "drainage time at the time of dam mode transition". The "drainage height at the time of dam preparation" and the "drainage time at the time of dam mode transition" are set in advance, and the set values are stored in the storage device of the water use management server 28.

[0047] After temporarily draining the water in the field H, the water use management server 28 raises the drainage height (step S30). In this way, the water use management server 28 changes the drainage height to the "drainage height during dam storage".

[0048] When it rains in this state, the rain that falls on the field H and its vicinity is stored in the field H. Since the drainage height of the field H is set relatively high (to the "drainage height during dam storage"), a large amount of precipitation can be stored in the field H (step S40). In this way, by temporarily storing precipitation in the field H, it is possible to suppress a large amount of precipitation from flowing into the rivers (the main river R1 and the tributary river R2), and it is possible to suppress the rise in water level and flooding of the rivers (step S50).

[0049] The user determines whether the weather and the rise in water level of the river have recovered. When the user determines that the weather and the rise in water level of the river have recovered, the user operates the user terminal 27 (step S60) and gives an instruction to the water use management server 28 to switch from the dam mode to the normal mode (step S70). In this way, in the field H, the water supply is resumed and the drainage height of the drainage device 33 is restored to the original level (set to the "normal drainage height").

[0050] In this way, by switching between the normal mode and the dam mode, the water use management server 28 can adjust the water level in the field H to a level suitable for the crops during normal times when the weather is stable, and can temporarily store precipitation in the field H during heavy rain to suppress the rise in water level and flooding of the rivers.

[0051] The water use 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, as shown in FIG. 5, the water use 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.

[0052] First, the overview of various screens (such as the map screen 110) will be described. The various screens are dynamic web pages by a CGI (Common Gateway Interface) program or the like. The various screens can be displayed on the browser of the user terminal 27.

[0053] The various screens (such as the map screen 110) are vertically divided into three parts 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 parts for switching the various screens. The first frame 101 and the second frame 102 are arranged at the upper part of the screen. Strings indicating the various screens are displayed on the first frame 101 and the second frame 102. The third frame 103 is a part for displaying information corresponding to the various screens. The user can change the content displayed in the third frame 103 by selecting the information displayed on the first frame 101 and the second frame 102. In this way, the user can switch the various screens.

[0054] 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.

[0055] The map screen 110 shown in FIG. 6 is a screen for displaying the map of the farmland H and the rainfall (precipitation amount). The map screen 110 is displayed by selecting the string "Overall Map" in the first frame 101. The map screen 110 (the third frame 103) includes a map display section 111 and a rainfall display section 112.

[0056] The map display unit 111 is a part that displays a map of the farm field H. The water management server 28 acquires map information from a predetermined server and displays the map information on the map display unit 111. A mark 111a and a weather information button 111b are arranged on the map display unit 111.

[0057] The mark 111a is a landmark indicating a predetermined point. The weather information button 111b is a button for displaying weather information of a predetermined area (for example, an area within a predetermined range including the point indicated by the mark 111a, or other areas displayed on the map display unit 111, etc.). When the weather information button 111b is pressed, the water management server 28 displays the long-term predicted rainfall amount (for example, the predicted rainfall amount up to 72 hours ahead) of the predetermined area.

[0058] The rainfall display unit 112 is a part that displays the maximum rainfall prediction in a graph 112a for an area within a range of 50 km (a 100 km square) in each of the four directions of east, west, south, and north centered on the point indicated by the mark 111a. Specifically, the water management server 28 divides the range into 1 km-sided meshes, and acquires the rainfall prediction for each mesh from a predetermined server. Then, based on the acquired rainfall prediction, the water management server 28 extracts the mesh that is expected to receive the most rain within a predetermined period in the future (for example, within 1 hour or 24 hours), and creates and displays a graph 112a of the rainfall prediction in the mesh. The graph 112a is a bar graph showing the rainfall amount every hour. Note that the graph 112a in this embodiment shows the maximum rainfall prediction in a range of 50 km (a 100 km square) in each of the four directions of east, west, south, and north, but the range is not particularly limited and can be arbitrarily changed.

[0059] As shown in FIG. 7, when the graph 112a is selected, a weather information display screen 113 is displayed. The weather information display screen 113 is a screen for enlarging and displaying the graph 112a. On the weather information display screen 113, the vertical bars of the graph 112a are color-coded according to the rainfall amount.

[0060] Specifically, the storage device of the water management server 28 stores, as rainfall thresholds, the rainfall amount at the warning level (e.g., 20 mm / h or more) and the rainfall amount at the alarm level (e.g., 30 mm / h or more). The water management server 28 compares the rainfall amount per hour with the threshold value and displays the graph 112a with color coding.

[0061] In addition, on the weather information display screen 113, the amount of rain that has fallen so far (the "record" shown in FIG. 7) and the detailed predicted precipitation within the next hour ("5-minute prediction") are also displayed. Also, on the weather information display screen 113, the user can download the weather information to the user terminal 27 (download button) and check the past weather information (past record display button).

[0062] By displaying the map screen 110 configured as described above, the user can grasp the future weather and the like, making it easier to determine whether to switch between the normal mode and the dam mode.

[0063] Note that the map screen 110 shown in FIGS. 6 and 7 is an example, and the information displayed on the map screen 110 can be arbitrarily changed. For example, on the map screen 110, it is also possible to display the water level of the main river R1 and the basin rainfall index (a numerical value obtained by calculating the amount of rain that has fallen in the area (basin) along the river and moves downstream). With such a configuration, when the water level of the main river R1 rises or when a rise in the water level of the main river R1 is expected from the basin rainfall index, the user can determine to switch to the dam mode. Also, when there is no expectation of a rise in the water level of the main river R1 from the basin rainfall index, the user can determine to maintain the normal mode (without making preparations such as draining the water in the field H once). When displaying the water level of the main river R1 and the like in this way, it is also possible to appropriately install a water level gauge for measuring the water level of the main river R1.

[0064] The weather graph setting screen 120 shown in FIG. 8 is a screen for setting the display of the rainfall display section 112 (see FIG. 6). The weather graph setting screen 120 is displayed by appropriately selecting information in the first frame 101 and the second frame 102. In the weather graph setting screen 120, it is possible to set thresholds and the like used for color-coding the graph 112a shown in FIG. 7 (such as setting warning values).

[0065] The dam management screen 130 shown in FIG. 9 is a screen for managing the farmland H. The dam management screen 130 is displayed by selecting the string "Overall Monitoring" in the first frame 101 and the string "Farmland Map" in the second frame 102. In the dam management screen 130, marks indicating the state of the farmland H are superimposed and displayed on the map information of the farmland H. Specifically, on the dam management screen 130, marks indicating the opening / closing state of the water supply tap, marks indicating whether it is in the normal mode or the dam mode, and marks indicating whether the current water level of the farmland H has reached the set water level (the target value of control (for example, the water level suitable for the growth of crops)) are displayed.

[0066] Here, the storage device of the water use management server 28 stores whether the farmland H is in the normal mode or the dam mode. Also, when displaying the dam management screen 130 as described above, the water use management server 28 acquires the opening / closing state of the water supply tap, the current water level of the farmland H, and the set water level of the farmland H from the farmland management server 36, and determines whether the set water level has been reached based on the acquisition result. The water use management server 28 appropriately displays the marks on the dam management screen 130 based on the information in these storage devices, the acquisition result of the opening / closing state, and the determination result of the set water level.

[0067] Also, as shown in FIG. 10, in the dam management screen 130, when a specific farmland H is selected, detailed information of the farmland H is displayed. Specifically, on the dam management screen 130, the name of the farmland H, the farmland group G described later, the set water level, the current water level, the opening degree of the water supply tap, the water temperature, the drainage mode (whether it is in the normal mode or the dam mode), the current drainage height, the name of the drainage device 33, the drainage height when the dam is being prepared, and the drainage height when the dam is storing water are displayed.

[0068] When the water management server 28 displays the above detailed information, among the above setting water levels, etc., it acquires the field group G, drainage mode, drainage height at the time of dam preparation, and drainage height at the time of dam storage from the storage device. Further, the water management server 28 acquires the remaining information (setting 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 acquisition result.

[0069] By displaying the dam management screen 130 configured as described above, the user can easily grasp the state of the field H and make a judgment on switching between the normal mode and the dam mode.

[0070] Note that the dam management screen 130 shown in FIGS. 9 and 10 is an example, and the information displayed on the dam management screen 130 can be arbitrarily changed. For example, it is also possible to display the water levels of the drainage channel 24c, the main river R1, and the tributary river R2 on the dam management screen 130. When displaying the water levels of the main river R1 and the tributary river R2 in this way, it is also possible to concurrently display the preparation water level (for example, the water level at which the flood control group is dispatched), the danger water level, and the flood danger water level.

[0071] Also, on the dam management screen 130, it is also possible to display the storage volume of the field H (the value obtained by multiplying the current water level of the field H by the area of the field H) together with the current water level of the field H. Further, on the dam management screen 130, the storage volume may be aggregated and displayed for each block (a group of fields connected to the same water diversion device 24, etc.), or it may be aggregated and displayed for the entire river basin.

[0072] In addition, on the dam management screen 130, it is also possible to display the storage ratio indicating the degree of water storage in the field H switched to the dam mode. The storage ratio can be obtained, for example, by dividing the current water level of the field H by the "drainage height during dam storage". Also, the storage ratio can be aggregated and displayed for each block or the entire basin. Further, on the dam management screen 130, it is possible to display the storage ratio with color-coding according to the magnitude of the storage ratio. Specifically, on the dam management screen 130, it is also possible to display it in yellow when the storage ratio exceeds "50%" and in red when it exceeds "75%".

[0073] In addition, on the dam management screen 130, the water supply situation may be displayed under normal conditions (when the weather is stable). For example, on the dam management screen 130, in addition to the above-described set water level and current water level, the water depth reduction (how much the water level decreases per unit time) etc. may be displayed, or the water demand obtained from these set water levels etc. may be displayed. Also, on the dam management screen 130, it is possible to display the said demand in a predetermined unit (for example, for each of the field H, block, and basin (irrigation water, headworks, dam, pumping station, main line (water distribution pipe 23a), branch line (water distribution pipe 24a))).

[0074] The operation screen 140 shown in FIG. 11 is a screen for performing the switching operation between the normal mode and the dam mode. The operation screen 140 is displayed by selecting the character string "Overall Monitoring" in the first frame 101 and the character string "Paddy Field Dam Operation" in the second frame 102. On the operation screen 140, the normal mode and the dam mode can be switched for each field group G (see FIG. 17). Note that the field group G is a collection of fields H. The 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 use management server 28. The operation screen 140 includes a mode selection section 141 and a status display section 142.

[0075] The mode selection section 141 is a section for selecting a switching mode for switching between the normal mode and the dam mode. The switching mode includes an automatic mode and a manual mode.

[0076] The automatic mode is a mode that automatically switches between the normal mode and the dam mode in the set order. In the automatic mode, the modes of the field groups G are switched in order 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 the user's manual operation. In the mode selection unit 141, there are arranged an automatic button 141a, a dam mode button 141b, a normal mode button 141c, and a manual button 141d as buttons for performing operations in such automatic and manual modes.

[0077] 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). The user can automatically switch the field group G to the dam mode by pressing the dam mode button 141b. Also, the user can automatically switch the field group G to the normal mode by pressing the normal mode button 141c. The flow of mode switching in the automatic mode will be described later.

[0078] The manual button 141d is a button for switching the availability of operations on the state display unit 142 described later. The user can perform operations on the state display unit 142 by pressing the manual button 141d.

[0079] Also, the user can temporarily stop the process of mode switching in automatic mode (the automatic damming process and the automatic return process described later) by pressing the manual button 141d during the process. After temporarily stopping the process, the user can resume switching to the dam mode or other modes in 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 manually. In this way, for example, when the user accidentally presses the dam mode button 141b or the like, the user can urgently stop the mode switching process and then arbitrarily switch to the desired mode.

[0080] In addition, the mode selection unit 141 is provided with lamps 141e corresponding to various buttons (such as the automatic button 141a). The lamp 141e indicates which mode is currently selected. The lamp 141e is arranged above the various buttons and operates according to the operations of the various buttons. Specifically, as shown in FIGS. 11 and 12, the lamp 141e lights up when the corresponding button (below the lamp 141e) is pressed and goes out when a non-corresponding button is pressed.

[0081] The state display unit 142 displays the current state of each field group G. The state display unit 142 is also used for manually switching between the normal mode and the dam mode during manual mode. In the state display unit 142, "control order", "group name", "state", and "manual operation" are displayed in a list for each field group G.

[0082] The "control order" indicates the order of the field groups G that can be switched in automatic mode. The "group name" is a character string indicating the name of the field group G.

[0083] "Status" indicates the status of the field group G. The status of the field group G includes "Normal", which indicates the normal mode, "Dam Preparation (Draining)", which indicates that the dam mode has been switched and temporary draining is in progress (the drainage height is "Drainage Height at Dam Preparation"), and "Dam", which indicates that the drainage height has increased in the dam mode (the drainage height is "Drainage Height at Dam Storage").

[0084] Note that the above "Control Sequence", "Group Name", and "Status" are stored in the storage device of the water management server 28.

[0085] "Manual Operation" is for the user to perform the switching operation between the normal mode and the dam mode. "Manual Operation" includes a drainage button 142a, a storage button 142b, and a normal button 142c. When the drainage button 142a or the like is pressed, the water management server 28 transmits information for identifying the drainage device 33 of the field group G corresponding to the button (in the same row) and information for changing the drainage height, etc. to the field management server 36. Thereby, the water management server 28 switches between the normal mode and the drainage mode according to the user's operation. Hereinafter, the functions of various buttons will be specifically described.

[0086] The drainage button 142a is a button for performing temporary drainage in the dam mode. When the drainage button 142a is pressed, the drainage height of the field group G is changed to "Drainage Height at Dam Preparation". Thereby, temporary drainage of the field H can be performed. Also, when the drainage button 142a is pressed, the water supply of the water supply device 31 is stopped. As shown in FIG. 12, the drainage button 142a can be pressed when the field group G is in the normal mode ("Status" is "Normal").

[0087] 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 "Drainage Height at Dam Storage". Thereby, a large amount of water can be stored in the field H. The storage button 142b can be pressed when the field group G is in the middle of temporary drainage ("Status" is "Dam Preparation (Draining)").

[0088] Normally, button 142c is a button for switching to the normal mode. When the normal button 142c is pressed, the drainage height of the field group G is changed to the "normal drainage height". Also, when the normal button 142c is pressed, the water supply of the water supply device 31 is restarted. The normal button 142c can be pressed when the field group G is in the dam mode (the "status" is 'dam preparation (draining)' or 'dam').

[0089] The user can manually switch between the normal mode and the dam mode by pressing the drainage button 142a or the like at an appropriate timing as described above. For example, when it becomes necessary to urgently store precipitation in the field H due to sudden rainfall or a rise in the river level, the user can continuously press the drainage button 142a and the storage button 142b (press the storage button 142b immediately after pressing the drainage button 142a) to switch from the normal mode to the dam mode without performing pre-drainage. In this way, the water management server 28 can substantially skip the process of draining the water in the field H in the manual mode. With such a configuration, the user can promptly store precipitation in the field H as needed.

[0090] Note that the operation screens 140 shown in FIGS. 11 and 12 are examples, and the configuration of the operation screen 140 can be arbitrarily changed. For example, the storage button 142b is configured to be pressable when the field group G is in temporary drainage (when the "status" is 'dam preparation (draining)') (see FIG. 12). However, in addition to temporary drainage, it is also possible to make the storage button 142b pressable when the field group G is in the normal mode (the "status" is 'normal'). With such a configuration, when the user switches from the normal mode to the dam mode, the user can skip the process of draining the water in the field H by pressing the storage button 142b without pressing the drainage button 142a.

[0091] The mode setting screen 150 shown in FIG. 13 is a screen for changing various settings related to switching between the normal mode and the 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 "Paddy 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).

[0092] The control setting section 151 is a part for setting time-related settings. As described above, in the automatic mode, the modes of the field groups G are switched in order at regular time intervals. The control setting section 151 can set such time intervals. Specifically, the time interval for switching to the dam mode can be set with "Drainage Interval at Dam Mode Transition". Also, the time interval for switching to the normal mode can be set with "Drainage Interval at Normal Mode Transition". Note that the set "Drainage Interval at Dam Mode Transition" and "Drainage Interval at Normal Mode Transition" are stored in the storage device of the water management server 28.

[0093] Also, as described above, in the dam mode, the water in the field H is drained once. The control setting section 151 can set this once-draining time. Specifically, the once-draining time can be set with "Drainage Time at Dam Mode Transition". As described above, the "Drainage Time at Dam Mode Transition" (set value) is stored in the storage device of the water management server 28.

[0094] The group setting section 152 is a part for setting the control-related settings of the field group G. Information related to the control of the field group G is displayed in a list in the group setting section 152. Specifically, in the group setting section 152, "No.", "Group Name", "Control Order", and "Deletion Target" are displayed in a list for each field group G.

[0095] "No." is a number indicating the line number. "Group Name" and "Control Order" are the same as those on the operation screen 140. In the group setting unit 152, the values of "Group Name" and "Control Order" can be set. "Deletion Target" is used to set whether to delete the field group G. Also, in the group setting unit 152, by pressing the "Row Addition" button, a new field group G can be created.

[0096] The device setting unit 153 shown in FIG. 14 is a part for setting the field water management system 30. Information regarding the field water management system 30 is displayed in a list on the device setting unit 153. Specifically, on the device setting unit 153, "No.", "Area Code", "Field Code", "Field Name", "Dam Drainage Height at Preparation", "Dam Drainage Height at Storage", "Drainage Device Name", "Drainage Height", "Dam Control Group", "Area", and "Remarks" are displayed in a list for each field H.

[0097] "No." is a number indicating the line number. "Area Code" is a number for identifying the area to which the field H belongs. "Field Code" is a number for identifying the field H. "Field Name" is a character string indicating the name of the field H. "Drainage Device Name" is a character string indicating the name of the drainage device 33. When multiple drainage devices 33 are installed in one field H, the name of any one of the drainage devices 33 is displayed. "Drainage Height" indicates the current drainage height. The water use management server 28 can display the above "Area Code" and "Field Code", etc. by acquiring information from the field management server 36.

[0098] "Dam Control Group" indicates to which field group G the field H belongs. "Area" indicates the area of the field H. In the device setting unit 153, "Dam Drainage Height at Preparation", "Dam Drainage Height at Storage", "Dam Control Group", "Area", and "Remarks" can be set.

[0099] By displaying the mode setting screen 150 configured as described above, the user can set appropriate values for "drainage height during dam preparation" and the like. For example, the user can set the "drainage height during dam storage" to an appropriate value considering the height and strength of the bank. Specifically, if the strength of the bank is low or the maintenance condition of the bank is poor, the "drainage height during dam storage" can be set to be somewhat lower than the height of the bank, effectively preventing the bank from collapsing when switching to the dam mode. Also, the user can set the "drainage height during dam preparation" and the "drainage height during dam storage" considering the growth stage of the crop (for example, the rice cultivation process).

[0100] Specifically, the maximum value of the drainage height of the field H suitable for growing the crop (the highest drainage height) is predefined for each variety and growth schedule. For example, it is known that during the panicle initiation stage, it is preferable to set the drainage height to 30 cm or less. Therefore, the user can set the "drainage height during dam storage" based on the highest drainage height. At this time, the user can also set the "drainage height during dam storage" based on the highest drainage height only when the crop in the field H is in a growth stage that requires attention.

[0101] Also, during the fixation of the herbicide, it is desirable not to lower the water level of the field H too much. Therefore, the user can also set the "drainage height during dam preparation" of the field H during the fixation of the herbicide to a relatively high setting value.

[0102] In addition, the water management server 28 can also automatically perform the setting of the "drainage height during dam preparation" and the "drainage height during dam storage" based on the growth stage of the crop as described above in accordance with the growth schedule stored in the field management server 36.

[0103] Even when the "Dam Storage Drainage Level" is set, if heavy rain that could cause extremely severe disasters is predicted, flood control shall be prioritized, and regardless of the value set by the user (Dam Storage Drainage Level), it is possible to store rainwater up to the maximum water storage capacity of Field H. For example, it is also possible to configure such that the set value of the "Dam Storage Drainage Level" is automatically overwritten. Additionally, it is also possible to configure such that the set value of the "Dam Storage Drainage Level" is overwritten based on instructions from relevant organizations such as local governments.

[0104] Note that the mode setting screen 150 shown in FIGS. 13 and 14 is an example, and the configuration of the mode setting screen 150 can be arbitrarily changed.

[0105] Hereinafter, the process of switching between the normal mode and the dam mode by the automatic mode of the operation screen 140 described above will be explained. First, the automatic dam conversion process of switching from the normal mode to the dam mode will be explained. Note that hereinafter, it is assumed that the states of all field groups G are in the normal mode at the start point of the automatic dam conversion process.

[0106] The automatic dam conversion process is started when the dam mode button 141b shown in FIG. 11 is pressed. As shown in FIG. 15, when the automatic dam conversion process is started, the water use management server 28 proceeds to step S110.

[0107] In step S110, the water use management server 28 selects a field group G to switch to the dam mode. At this time, the water use management server 28 selects one field group G with the highest priority (the value of "Control Order" shown in FIG. 13 is the smallest) among the field groups G. At this time, the water use management server 28 excludes the field group G that has already been selected in the series of flows shown in FIG. 15, and selects the field group G with the highest priority among the unselected field groups G. Note that if there are no unselected field groups G, the water use management server 28 does not select a field group G. When the process of step S110 is completed, the water use management server 28 proceeds to step S120.

[0108] In step S120, the water management server 28 determines whether there is a field group G that is the target of the processing after step S130 described later. Specifically, the water management server 28 determines whether the field group G could be selected in step S110. If the water management server 28 cannot select the field group G (step S120: No), it ends the automatic damming process. In this way, when the water management server 28 has set all the field groups G to the dam mode, it ends the automatic damming process. On the other hand, if the water management server 28 can select the field group G (step S120: Yes), it proceeds to step S130.

[0109] 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" (when it is "normal" or "dam preparation (draining)", step S130: Yes), the process proceeds to step S140. On the other hand, if the "status" of the field H is "dam" (step S130: No), the process proceeds to step S110. In this way, the water management server 28 does not perform the processing after step S140 for the field group G that has already been switched to the dam mode (the "status" is "dam") in the manual mode, and selects the next field group G to be switched to the dam mode.

[0110] In step S140, the water management server 28 sends 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 the remote operation of the field water management system 30 by the owner terminal 35. When the processing of step S140 is completed, the water management server 28 proceeds to step S150.

[0111] In step S150, the water management server 28 transmits a signal to the farm management server 36 to change the drainage height of the drainage device 33 installed in the farm H belonging to the farm group G selected in step S110 to the "drainage height at dam preparation time". At this time, the water management server 28 changes it to the "drainage height at dam preparation time" set for each farm H on the mode setting screen 150 (see FIG. 14). When the process of step S150 ends, the water management server 28 executes the processes of steps S160 and S170 and the process of step S180 in parallel.

[0112] In step S160, the water management server 28 waits for the elapse of the "drainage time at dam mode transition" set on the mode setting screen 150 (see FIG. 13). When the process of step S160 ends, the water management server 28 proceeds to step S170 and changes the drainage height of the drainage device 33 installed in the farm H belonging to the farm group G selected in step S110 to the "drainage height during dam storage". At this time, the water management server 28 changes it to the "drainage height during dam storage" set for each farm H on the mode setting screen 150 (see FIG. 14).

[0113] Also, in step S180, the water management server 28 waits for the elapse of the "drainage interval at dam mode transition" set on the mode setting screen 150 (see FIG. 13). When the process of step S180 ends, the water management server 28 proceeds to step S110 and switches to the dam mode (processes after step S120) for the next farm group G.

[0114] The water management server 28 switches to the dam mode with a time difference for each farm group G in this way.

[0115] Hereinafter, with reference to FIGS. 16 and 17, a specific example of the automatic damming process will be described. In the following, as an example of the farm group G, the case where "Control Targets 1 to 3" are set to the dam mode will be described. Also, "Control Targets 1 to 3" are assumed to be located on the downstream side of the branch river R2 in order from the smallest number (see FIG. 17). Note that being located on the downstream side means that the drainage channel 24c (see FIG. 1) of the farmland H belonging to "Control Targets 1 to 3" is connected to the downstream side of the branch river R2. Also, hereinafter, as set in FIG. 13, the dam mode is switched in the order of "Control Target 1", "Control Target 2", and "Control Target 3".

[0116] As shown in FIG. 16, "Control Targets 1 to 3" are switched to the normal mode in the initial state before the execution of the automatic damming process. When the automatic damming process is executed in this state, the water use management server 28 changes the drainage height of the farmland H of "Control Target 1" with the highest priority to the "drainage height at dam preparation" as shown in FIGS. 16 and 17(a) (Steps S110, Step S120: Yes, Step S130: Yes, Steps S140·S150). In this way, the water use management server 28 first temporarily drains the water of the farmland H belonging to "Control Target 1".

[0117] When the "drainage interval at dam mode transition" elapses after the start of drainage of "Control Target 1" (Step S180), the water use management server 28 changes the drainage height of "Control Target 2" with the next highest priority after "Control Target 1" to the "drainage height at dam preparation" as shown in FIGS. 16 and 17(b).

[0118] Also, when the "drainage interval at dam mode transition" elapses after the start of drainage of "Control Target 2", the water use management server 28 changes the drainage height of "Control Target 3" to the "drainage height at dam preparation" as shown in FIGS. 16 and 17(c).

[0119] Also, when the drainage time during dam mode transition has elapsed since the start of drainage of "Control Target 1" (step S160), as shown in FIG. 17(c), the water management server 28 changes the drainage height of "Control Target 1" to the "drainage height during dam storage" (step S170). Also, for "Control Target 2" and "Control Target 3" as well as for "Control Target 1", the water management server 28 changes the drainage height to the "drainage height during dam storage" (not shown).

[0120] With such a configuration, the water management server 28 can shift the timing of draining water from the farmland H when switching to the dam mode. As a result, it is possible to prevent a large amount of water from flowing into the river (main river R1 and tributary R2) from the farmland H all at once, and suppress the rise in water level of the river.

[0121] Also, by draining water in order from the downstream side as shown in FIG. 17, the drainage on the upstream side is less likely to be affected by the rise in water level due to the drainage on the downstream side, and the drainage of the farmland H can be efficiently performed.

[0122] In the above description, an example was shown in which the dam mode button 141b was pressed when the states of all the farmland groups G were in the normal mode. However, for example, it is also assumed that it may be pressed while some of the farmland groups G are being automatically switched to the normal mode (during the execution of the automatic return process described later), or while some of the farmland groups G are already in the state of being switched to the dam mode by manual operation. In this case, if there is a process (automatic return process) being executed, the water management server 28 stops that process, and by the automatic dam formation process, sequentially switches to the dam mode the farmland groups G for which the drainage height is not set to the "drainage height during dam storage".

[0123] Specifically, in the automatic damming process, when the "status" of the field group G selected in step S110 is "Normal" or "Dam Preparation (During Drainage)", 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 the field group G with the "status" of "Dam Preparation (During Drainage)" until the "Drainage Time at Dam Mode Transition" elapses again (executes step S160).

[0124] Hereinafter, the automatic return process of switching from the dam mode to the normal mode by the automatic mode will be described. It is assumed that at the start point of the automatic return process, the status of all field groups G is in the dam mode.

[0125] 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 in the same manner as steps S110 to S130 in the automatic damming process. In this way, the water management server 28 selects the field groups G in the order set in the "Control Order" (see FIG. 13), and when the "status" of the fields H belonging to the selected field group G is other than "Normal", the processes after step S240 are executed.

[0126] In step S240, the water management server 28 sends a signal to the field management server 36, opens 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 enables the remote operation of the field water management system 30 by the owner terminal 35. When the process of step S240 is completed, the water management server 28 proceeds to step S250.

[0127] 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 device 33 installed in the field 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.

[0128] In step S260, the water management server 28 waits for the lapse of the "normal mode transition drainage interval" set on the mode setting screen 150 (see FIG. 13). When the process of step S260 ends, the water management server 28 proceeds to step S210 and performs the switching to the normal mode (the processes after step S220) for the next field group G.

[0129] In this way, the water management server 28 switches to the normal mode with a time difference for each field group G.

[0130] Hereinafter, with reference to FIGS. 19 and 20, a specific example of the automatic return process will be described. In the following, as an example of the field group G, the case where "control targets 1 to 3" are set to the normal mode will be described. Also, it is assumed that "control targets 1 to 3" are located on the downstream side of the branch river R2 in order from the smallest number (see FIG. 20). Also, hereinafter, as set in FIG. 13, "control target 1", "control target 2", and "control target 3" are set to the normal mode in this order.

[0131] As shown in FIG. 19, "control targets 1 to 3" are switched to the dam mode in the initial state before the execution of the automatic return process. When the automatic return process is executed in this state, the water management server 28 changes the drainage height of the field H of "control target 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, step S240·S250). In this way, the water management server 28 first returns "control target 1" to the normal mode. As a result, the water management server 28 can discharge water from the field H of the field group G belonging to "control target 1" among the fields H where the water level has increased due to heavy rain.

[0132] After returning "Control Target 1" to the normal mode and the "Drainage Interval at Normal Mode Transition" has elapsed (step S260), as shown in FIGS. 19 and 20(b), the water management server 28 changes the drainage height of "Control Target 2" with the next highest priority after "Control Target 1" to the "Normal Drainage Height".

[0133] Also, after returning "Control Target 2" to the normal mode and the "Drainage Interval at Normal Mode Transition" has elapsed, as shown in FIGS. 19 and 20(c), the water management server 28 changes the drainage height of "Control Target 3" to the "Normal Drainage Height".

[0134] With such a configuration, it is possible to shift the timing of draining water from the farmland H when switching to the normal mode. As a result, it is possible to prevent a large amount of water from flowing into the river (main river R1 and tributary R2) from the farmland H all at once, and suppress the increase in water level of the river.

[0135] Also, by draining water in order from the downstream side as shown in FIG. 20, the drainage on the upstream side is less likely to be affected by the water level rise due to the drainage on the downstream side, and the drainage of the farmland H can be performed efficiently.

[0136] In the above description, an example is shown where the normal mode button 141c is pressed when the states of all the farmland groups G are in the dam mode. However, for example, it is also assumed that it is pressed during the process of some of the farmland groups G being automatically switched to the dam mode (during the execution of the above automatic damming process), or when it is pressed in a state where some of the farmland groups G have already been switched to the normal mode by manual operation. In this case, if there is a process being executed (automatic damming process), the water management server 28 stops that process, and by the automatic return process, sequentially switches the farmland groups G that have not been returned to the normal mode to the normal mode.

[0137] Specifically, in the automatic return process, when the "status" of the field group G selected in step S210 is "dam preparation (draining)" or "dam", the water management server 28 proceeds to the process of step S240 (step S230: Yes), and changes the drainage height and the like of the field group G (steps S240 to S260).

[0138] As described above, the field water storage system 10 according to the present embodiment is a field water storage system 10 including a water management server 28 (control unit) capable of controlling a water supply device 31 and a drainage device 33 (field water management device) that manage the water supply and drainage of the field H. The water management server 28 includes, as a control mode for controlling the water supply device 31 and the drainage device 33, a normal mode (first mode) for adjusting the drainage height of the field H according to a predetermined condition (crop growth in the present embodiment), and a dam mode (second mode) for making it possible to store a larger amount of water in the field H than in the normal mode by setting the drainage height of the field H higher than the drainage height ("normal drainage height") in the normal mode regardless of the predetermined condition.

[0139] By configuring in this way, 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. Thus, the field H can be used as a dam to suppress the increase in water level and flooding of rivers due to heavy rain or the like.

[0140] Further, in the dam mode, the water management server 28 sets the drainage height of the field H to a first drainage height ("drainage height at dam preparation"), once drains the water in the field H, and then sets the drainage height of the field H to a second drainage height ("drainage height at dam storage") higher than the first drainage height (see FIG. 16).

[0141] In this way, by once draining the water in the field H, a larger amount of water can be stored in the field H.

[0142] In addition, the water management server 28 can set a plurality of field groups G each including at least one field H (see FIG. 14), and can switch the control mode for each of the field groups G (see FIGS. 17 and 20).

[0143] In this way, by dividing a plurality of fields H into a plurality of field groups G and switching the control mode for each field group G, it is possible to facilitate the management of water supply and drainage. For example, the control modes 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 make it easier to manage water supply and drainage.

[0144] In addition, the water management server 28 includes an automatic mode in which the control modes of the plurality of field groups G are automatically switched in the set order as a switching mode for switching the control mode, and a manual mode in which the control modes of the plurality of field groups G are switched by a user's manual operation (see FIGS. 11 and 12).

[0145] By configuring in this way, the convenience can be improved by arbitrarily using the automatic mode for automatically switching the control mode and the manual mode for manual operation.

[0146] In addition, in the automatic mode, the water management server 28 switches the control mode according to a predetermined set time (see FIG. 16). The set time in this embodiment includes a "drainage time at the time of dam mode transition" that defines the time for once draining the water in the field H, a "drainage interval at the time of dam mode transition" that defines the time difference of the field group G to be switched to the dam mode, and a "drainage interval at the time of normal mode transition" that defines the time difference of the field group G to be switched to the normal mode.

[0147] By configuring in this way, the control mode can be appropriately switched according to a preset set time.

[0148] In addition, the water management server 28 can change the set time (see FIG. 13).

[0149] By configuring in this way, the control mode can be switched more appropriately. For example, by arbitrarily changing the set time according to the size of the river, etc., the increase in water level and flooding of the river can be effectively suppressed.

[0150] In addition, the water management server 28 can change the first drainage height ( "drainage height when preparing the dam") and / or the second drainage height ( "drainage height when storing water in the dam") in the dam mode for each field H (see FIG. 14).

[0151] By configuring in this way, an appropriate drainage height can be set according to the field H.

[0152] Note that the water supply device 31 and the drainage device 33 according to the present embodiment are one embodiment of the field water management device according to the present invention. In addition, the water management server 28 according to the present embodiment is one embodiment of the control unit according to the present invention.

[0153] Although the embodiments of the present invention have 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.

[0154] For example, as long as the water management server 28 can control the water supply device 31 and the drainage device 33, its configuration (cloud server, on-premises server, etc.) is not particularly limited. In addition, although the field management server 36 is assumed to be a cloud server, it is not limited to this, and it may be an on-premises server.

[0155] In addition, in this embodiment, an example in which the field water storage system 10 itself includes a field water management system 30 that performs water supply and drainage for each field H has been shown. However, the present invention is not limited to this. For example, the field water storage system 10 can also be used in cooperation with a separately provided external field water management system 30 to utilize the field H as a dam. Further, the field water storage system 10 may be activated in the normal mode and the dam mode by API cooperation from a monitoring system (a system different from the water use management system 20) that manages drainage airports, drainage gates, etc.

[0156] Also, regarding the control of the drainage device 33 in the dam mode (the process of setting the drainage height to the "drainage height at dam preparation" and the "drainage height during dam storage"), it was assumed that the water use management server 28 performs it. However, 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 by API cooperation, for example.

[0157] Also, the set values of the "drainage height at dam preparation" and the "drainage height during dam storage" were assumed to be changed by the water use management server 28 (the mode setting screen 150 shown in FIG. 14). However, the device that changes the set values is not particularly limited. The change of the set values may be performed by the monitoring system by API cooperation, for example.

[0158] Also, in the normal mode, it was assumed that the drainage height is adjusted in consideration of the growth of the crops. However, the index used as the standard for adjusting the drainage height in the normal mode is not limited to the growth of the crops and can be arbitrarily changed.

[0159] Also, in this embodiment, the normal mode and the dam mode are switched for each field group G. However, the unit for switching the normal mode and the dam mode is not limited to the field group G and can be arbitrarily changed. For example, the switching between the normal mode and the dam mode may be performed for each field H.

[0160] Also, in the dam mode, it was assumed that the water in the field H was once drained, but it is not limited to this. That is, in the dam mode, the water in the field H may be raised without being drained once, and the drainage height may be increased.

[0161] In this embodiment, the switching between the normal mode and the dam mode can be executed automatically and manually, but it is not limited to this. For example, it may be possible to switch the mode only automatically (having only the automatic mode). Also, the field water storage system 10 may be configured to be able to switch the mode only manually (having only the manual mode).

[0162] In the automatic mode, the modes of a plurality of field groups G are switched with a time difference, but it is not limited to this, and the modes of a plurality of field groups G may be switched simultaneously.

[0163] In this embodiment, information regarding the mode (such as "drainage interval at the time of dam mode transition" and "drainage height during dam storage") can be arbitrarily set by the user, but it is not limited to this, and the information regarding the mode may be preset.

[0164] The switching to the dam mode in the automatic mode is triggered by the pressing of the dam mode button 141b on the operation screen 140, but the timing of switching to the dam mode is not particularly limited and can be arbitrarily changed. For example, the switching to the dam mode may be automatically executed when the rainfall prediction exceeds a preset threshold. Also, when the rainfall prediction exceeds a preset threshold, it is possible to inquire the user about the execution of the switching to the dam mode. Specifically, the water use management server 28 displays a pop-up including a confirmation message (for example, a message such as "Heavy rain of 〇〇 mm is predicted. Do you want to activate the paddy field dam?") and an activation button. Also, when the user presses the activation button, the water use management server 28 executes the switching to the dam mode.

[0165] In addition, before switching to the dam mode, the water management server 28 can also inquire not only users but also relevant persons of the farmland H (such as the head of the agricultural cooperative, etc.). In this case, if the relevant person agrees to the execution, the switching to the dam mode is executed for the farmland H in the area of the relevant person who has agreed to the execution or all the farmland H. At this time, it can be included in the execution conditions that the water levels of the drainage channel 24c and the river are below the specified water levels. Also, the water levels of the drainage channel 24c and the river can be displayed when inquiring the relevant person.

[0166] In addition, although the water management server 28 is configured to switch between the normal mode and the dam mode in order based on the time elapsed since the drainage height was lowered, the index used for the mode switching is not limited to this. For example, the water management server 28 may be configured to switch between the modes in order according to a preset specified water level. Specifically, when the water level of the farmland H in a predetermined farmland group G drops to half (or one-third or one-fifth), the water management server 28 may start switching the mode of the next farmland group G. Also, when the water levels of the drainage channel 24c and the river are not rising (below a predetermined threshold value), the water management server 28 may start switching the mode of the next farmland group G.

[0167] Here, in the dam mode of this embodiment, the water in the farmland H is drained once. Therefore, when returning from the dam mode to the normal mode when heavy rain does not fall (the weather forecast is incorrect), it is necessary to supply a large amount of water to the farmland H. However, since there is a limit to the amount of water that can be supplied to the farmland H, there is a possibility that the water level of the farmland H will not return immediately even after returning to the normal mode.

[0168] 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 the normal mode. The intermediate mode is a mode in which the amount of water once drained from the field H is less than that in the dam mode. In the intermediate mode, the water in the field H is once drained to such an extent that the water level of the field H can be quickly restored (for example, within one day). At this time, a value lower than the "normal drainage height" and higher than the "dam preparation drainage height" is set for the drainage height of the field H. In the intermediate mode, after the water in the field H is once 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 to its original state when heavy rain does not occur.

[0169] Also, in this embodiment, it is assumed that the grouping of the fields H (setting which field group G a certain field H belongs to) is performed by the manual operation of the user (see FIG. 14), but the present invention is not limited to this. For example, the grouping of the fields H may be automatically performed by the water management server 28. At this time, the water management server 28 can perform grouping according to, for example, any judgment criteria. Such judgment criteria include the area of the field H, the position of the field H with respect to the branch river R2 (upstream, downstream), and the growth status of the crops. Further, the water management server 28 can be displayed on the mode setting screen 150 so that the judgment criteria can be arbitrarily selected.

[0170] When performing grouping according to the area of the field H, the water management server 28 can group the fields H, for example, in descending order of area, or group the fields H so that the total area of the fields H belonging to each field group G is approximately the same. Also, when the water management server 28 groups the fields H according to the position of the field H with respect to the branch river R2, for example, the fields H can be automatically grouped in order from the field H connected to the upstream side (or downstream side) of the branch river R2. Also, when the water management server 28 groups the fields H according to the growth status of the crops, for example, the fields H can be grouped for each field H with similar growth status.

[0171] Also, in this embodiment, it is assumed that the "control order" (priority order of mode switching in the automatic mode) of the field group G is set by the manual operation of the user (see FIG. 13), but the present invention is not limited to this. For example, the setting of the "control order" may be automatically performed by the water management server 28 according to an arbitrary criterion (for example, the position of the field H with respect to the branch river R2). Specifically, the water management server 28 can set the "control order" so that the field group G connected to the downstream side of the branch river R2 has a higher priority.

Explanation of Signs

[0172] 10 Field water storage system 28 Water management server 31 Water supply device 33 Drainage device H Field

Claims

1. A farm water storage system comprising a control unit capable of controlling a farm water management device for managing the water supply and drainage of a farm field, wherein the control unit, as a control mode for controlling the farm water management device, a first mode for adjusting the drainage height of the farm field according to a predetermined condition; a second mode in which the drainage height of the farm field is set to a first drainage height, the water in the farm field is drained once, and then the drainage height of the farm field is set to a second drainage height higher than the first drainage height, so that a larger amount of water can be stored in the farm field than in the first mode; a third mode in which the drainage height of the farm field is set to a third drainage height higher than the first drainage height, the water in the farm field is drained once, and then the drainage height of the farm field is set to a fourth drainage height higher than the third drainage height, so that a larger amount of water can be stored in the farm field than in the first mode; A farm water storage system comprising the above.

2. The switching between the second mode and the third mode is performed based on weather information. The farm water storage system according to Claim 1.

3. The fourth drainage height in the third mode is the same as the second drainage height in the second mode. The farm water storage system according to Claim 1 or Claim 2.

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