JP7418293B2 - Field water management device - Google Patents

Description

The present invention relates to a field water management device.

Patent Document 1 discloses a water supply faucet and a drain faucet equipped with a field electric actuator that operates a displacement mechanism for controlling water supply to or drainage from a field. By using these water taps and drain plugs, it becomes possible to remotely control the water supply to and drainage from the field via the field water management device.

The field electric actuator is a control device that controls water faucets and drain valves, and includes an actuator equipped with an electric motor that operates the water faucet or drain valve, and an electronic control that controls the actuator and communicates with the field water management device. It has a control section with a circuit.

Since it is difficult to use commercial power in fields that are far away from each field's commercial power supply equipment, the system is equipped with a storage battery that supplies power to the control unit and actuators, and a solar cell for charging to avoid a drop in the state of charge of the storage battery. ing.

The field water management device needs to know the water level in each field in order to control the water taps in each field. For this purpose, for example, a water level sensor is installed near the water tap, and the water level detected by the water level sensor is monitored. The information is configured to be transmitted to the field water management device via an electronic control circuit provided in the water tap.

Japanese Patent Application Publication No. 2017-193914

However, when a field water management device remotely controls the opening and closing of water taps in each field based on the values of water level sensors installed in each field, if the water level sensor values do not represent accurate water levels, the target may not be met. There was a risk that the water level would fall below the set water level or exceed the set water level.

For example, if the field is affected by wind, a water level gradient will occur where the water level will be lower on the windward side and higher on the leeward side, even in the same field. This can be detected by the position where the water level sensor is installed. There will be a difference in the water level.

In order to avoid the influence of water level gradients, installing multiple water level sensors in one field will increase equipment costs, and if a water level sensor is installed in the center of the field, the water level sensor will be connected to the water tap installed in the corner of the field. It is necessary to extend the signal line to the drain plug, which not only complicates the installation work but also poses a risk of the signal line breaking. Furthermore, if a wireless signal function is added to the water level sensor instead of a signal line, equipment costs will increase.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a field water management device that can accurately detect water levels in each field without being affected by water level gradients.

In order to achieve the above object, the first characteristic configuration of the field water management device according to the present invention is a field water management device that manages water supply to each field in a field group consisting of a plurality of fields. , a water level calculation unit that calculates the current water level of the water supply target field; and a water supply control unit that controls the opening and closing of an automatic hydrant provided in the water supply target field so that the current water level calculated by the water level calculation unit becomes a set water level. and, the water level calculation unit includes a sensor installed in a corner of a pair of fields facing each other with a water supply pipe in between, on the upstream side of the water supply pipe and close to the water supply pipe; Each water level information detected by at least three water level sensors including a sensor installed in a corner of a pair of fields adjacent to the pair of fields with a pipe in between, on the downstream side of the water supply pipe and close to the water supply pipe. The purpose of this method is to calculate field water levels based on the above-mentioned results, while suppressing the influence of water level gradients caused by wind.

The water level calculation unit acquires water level information detected by a plurality of water level sensors installed in a group of fields, that is, a plurality of water level sensors installed in a plurality of fields, and calculates the water level caused by wind based on the water level information. The field water level that suppresses the influence of slope is calculated, and the water supply control unit automatically opens and closes the water taps so that the field water level calculated by the water level calculation unit becomes the set water level. The water level can be adjusted appropriately. Each field arranged in the same arrangement direction is affected by the same wind and has a similar water level gradient. Therefore, by changing the position of the water level sensor installed in each field, it becomes possible to detect a plurality of water levels corresponding to the water level gradient in substantially the same field. For example, an appropriate water level can be determined by arithmetic processing of the water levels detected by such a plurality of water level sensors. Examples include averaging processing of all values, averaging processing of upper and lower limit values, and processing of extracting the median value.

By installing water level sensors at different corners of the four corners of each field, and based on the water level information obtained by each water level sensor, the water levels at the three different corners of the same field can be obtained, and the water level calculation section can be used to calculate the The water level in one corner can also be estimated through arithmetic processing, and the water level in the field can be appropriately determined. Then, the water level obtained by the calculation becomes the water level of each field.

In many cases, a plurality of fields are arranged so as to sandwich the water supply pipe along the direction in which the water supply pipe extends. In such fields, at least one sensor is installed in a corner close to the water supply pipe on the upstream side of a pair of fields facing each other with the water supply pipe in between; It is preferable to include one sensor installed in a corner of a pair of fields adjacent to the field on the downstream side of the water supply pipe and close to the water supply pipe.

In addition to the first characteristic configuration described above, the second characteristic configuration is such that the water level calculation unit detects the water level using a plurality of water level sensors provided in a plurality of fields arranged in the same arrangement direction among the field group. The purpose of this method is to calculate field water levels that suppress the influence of water level gradients caused by wind, based on each piece of water level information obtained.

Each field arranged in the same arrangement direction is affected by the same wind, resulting in a similar water level gradient. Therefore, by changing the position of the water level sensor installed in each field, it becomes possible to detect a plurality of water levels corresponding to the water level gradient in substantially the same field. For example, an appropriate water level can be determined by arithmetic processing of the water levels detected by such a plurality of water level sensors. Examples include averaging processing of all values, averaging processing of upper and lower limit values, and processing of extracting the median value.

The third characteristic configuration is that, in addition to the first or second characteristic configuration described above, the plurality of water level sensors include at least a first water level sensor that detects a windward water level and a second water level sensor that detects a leeward water level. The point is that it includes a sensor.

In order to detect a plurality of water levels corresponding to the water level gradient, it is preferable to include at least a first water level sensor that detects the windward water level and a second water level sensor that detects the leeward water level. The first water level sensor and the second water level sensor may be installed in the same field, or may be installed in different fields.

The fourth characteristic configuration is that, in addition to any one of the first to third characteristic configurations described above, at least one of the plurality of water level sensors is a water level sensor installed in a field other than the water supply target field. It is in.

The water level of a field to be watered can now be calculated based on the value of a water level sensor installed in a field different from the field to be watered, and there is no need to increase the number of water level sensors installed in each field.

The fifth characteristic configuration is that, in addition to any one of the first to fourth characteristic configurations described above, the water level calculation unit calculates the field water level when the wind speed acquired from the meteorological data center is equal to or higher than the reference wind speed. , the water level measured by one preset water level sensor when the wind speed is less than the reference wind speed is employed as the field water level.

It is preferable that when the wind speed obtained from the meteorological data center is equal to or higher than the standard wind speed, it is determined that a non-negligible water level gradient has occurred in the field, and the water level calculation unit calculates the field water level, and when the wind speed is less than the standard wind speed, the water level gradient is determined to be present in the field. It is preferable to use the measured water level of one water level sensor, which has been determined in advance and determined not to be a problem, as the field water level.

As explained above, according to the present invention, it has become possible to provide a field water management device that can accurately detect the water level in each field without being affected by wind.

Illustration of irrigation water equipment Explanatory diagram of the field Diagram of field water management system (a) and (b) are explanatory diagrams showing the arrangement of water level sensors installed in the field. An explanatory diagram showing another embodiment and showing the arrangement of water level sensors installed in a field

Below, a field water management device according to the present invention will be explained based on the drawings. The term "field" used in the following explanation refers to both rice paddies and fields, and a field group refers to a plurality of fields that are supplied with irrigation water from a common water distribution system that is divided from a water source by a diversion works or the like. Furthermore, a large-scale field group is composed of a plurality of block field groups, and the necessity of water supply is managed for each block field group. Normally, irrigation water taken from a common water source is supplied to different groups of fields through multiple water distribution systems separated by diversion works or the like. In the following embodiments, a field for growing rice will be described, but the same applies to a field for cultivation.

[Configuration of irrigation water equipment]
As shown in FIG. 1, the irrigation water equipment includes a main water pipe 120, a branch water pipe 121, and a water pipe 121, which is a main water pipe, and a water pipe 121 that is a branch pipe. This is equipment for sending water to each field 1 via a water supply pipe 100 connected to a water pipe 121.

In this embodiment, for convenience, the delivery of irrigation water managed by the irrigation water management device is referred to as water distribution, and the delivery of irrigation water to the field managed by the field water management device is referred to as water supply.

Irrigation water taken at the pumping station 131 is directly pumped to the drain pipe 120 via the pressure pump 131P, or via the pump 131P to the distribution reservoir 122 (indicated by a broken line in FIG. 1) which is a regulating tank. ), the water is then conveyed from the water distribution reservoir 122 to the water distribution pipes 120 by gravity. In either case, the pump 131P is basically configured with a single or a plurality of two pumps that are operated alternately, and when the amount of water to be fed increases, both pumps are operated simultaneously.

The main water distribution pipe 120 is branched toward each field group 10, and a water diversion device 140 is provided that functions as a water diversion facility for adjusting the amount of water distributed to each branched water distribution pipe 121. That is, the irrigation water pumped from the pump station 131 is sent to each field group 10 via the water supply pipe 100 after the water distribution amount is adjusted by the water distribution device 140.

Each field 1 arranged along the water supply pipe 100 is provided with a water supply device 2 equipped with a water tap connected to the water supply pipe 100 so that water can be supplied thereto. Furthermore, each field 1 is provided with a drainage device 4 equipped with a drain plug, and is configured such that water discharged from each field 1 via the drainage device 4 is discharged into the river via a drainage channel 9. .

[Composition of field equipment]
As shown in FIG. 2, a field 1 includes a water supply device 2 equipped with a water tap that guides irrigation water flowing into a water supply pipe 100 to the field 1 via a water conduit 3, and a water supply system 2 that discharges water from the field 1. A drainage device 4 equipped with a drain plug for discharging water into a drainage channel 9 via a waterway 5, a water level sensor 6 for measuring the water level in the field 1, and the like are provided.

The water supply device 12 and the drainage device 16 include a power storage device equipped with a solar panel SP, an electric motor that drives a water tap or a drain tap, a control circuit that controls the electric motor, a communication circuit that performs wireless communication via a wireless repeater 7, and the like. A motor for driving a water tap and a drain tap, a communication circuit, etc. are configured to operate using the electric power of a condenser in which electric power generated by the solar panel SP is stored.

A wireless repeater 7 that can be connected to a communication network such as the Internet is installed near the field 1, and the communication circuits provided in the water supply device 2 and the drainage device 4 function as a field water management device via the wireless repeater 7. It is configured to be able to communicate with the field water management server 21. The status of the hydrant or drain valve and the water level in each field 1 detected by the water level sensor 6 are transmitted to the field water management server 21, and the field water management server 21 determines the amount of water supplied and/or drained through the hydrant. The drainage water level through the tap can be adjusted by remote control.

[Configuration of water supply and distribution management system]
Returning to FIG. 1, the pressure pump 131P provided at the pumping station 131 is provided with a control circuit and a communication circuit, and is configured to be able to communicate with the irrigation water management server 31 functioning as an irrigation water management device via the communication circuit. There is. Each water diversion device 140 provided in the water distribution pipes 120, 121 connecting the pumping station 131 and each field group 10 is provided with a flow rate adjustment valve for water diversion, a control circuit and a communication circuit for controlling the flow rate adjustment valve, It is configured to be able to communicate with the irrigation water management server 31 via a communication circuit. The irrigation water management server 31 remotely controls the pressure pump 131P provided at the pump station and the flow rate adjustment valve provided in the water diversion device 140.

Taking paddy rice cultivation as an example, a sufficient amount of water is supplied to the field and puddling is performed, deep water management is continued for a while after rice planting to protect the rice, and once the rice has stabilized to a certain extent, shallow water management is followed by intermittent watering. It is necessary to adjust the water level in the field as the rice grows, such as restarting intermittent watering after drying the rice for a period of time to encourage root growth and suppress the growth of stems, and draining water at harvest time.

When the water supply periods for each field overlap, such as during the puddling season, and it is necessary to supply a large amount of water at the same time, a rotation system is used to ensure that a certain amount of irrigation water secured at the water source is distributed fairly to each field. It is necessary to plan and manage water supply schedules for each field group.

In constant irrigation modes such as deep water management and shallow water management, where the water level in each field is maintained at the set water level, it is also necessary to replenish the amount of water that has dropped from the set water level on a daily basis due to the effects of reduced water depth such as evaporation, transpiration, and infiltration. be.

However, depending on the water pressure of the water supply pipes, it may not be possible to supply a sufficient amount of water even to fields in the same field group, and if the water tap continues to be opened even after the specified amount of water has been supplied, water will not be supplied to other fields. Sometimes the quantity is insufficient.

Furthermore, even in rice cultivation, water supply times may vary depending on the variety of rice, making it extremely difficult to plan and manage the supply of water in the right amount at the right time, depending on the unique conditions of each field.

In order to deal with such problems flexibly, the water supply and distribution management system is managed by farmers by linking the above-mentioned irrigation water management server 31 and field water management server 21 via communication media such as the Internet. This system makes it possible to supply irrigation water appropriately according to the conditions of individual fields.

For example, when the required water supply amount for each field group 10 is sent from the field water management server 21 to the irrigation water management server 31, the irrigation water management server 31 determines the number of operating pressure pumps 131P and the flow rate adjustment valve installed in the water diversion device 140. By controlling water, water can be managed to be distributed appropriately.

[Configuration of field water management system]
FIG. 3 shows the configuration of the field water management system 20.
The field water management system 20 includes a field water management server 21 which is a field management device, a terminal device 8 owned by a farmer, etc., a water supply device 2, a drainage device 4, a water level sensor 6, etc. provided in each field 1. It is composed of The terminal device 8 includes a portable terminal device such as a smartphone or a tablet computer, and a stationary terminal device such as a desktop computer.

The field water management server 21 includes a field management section 21A that manages the status of each field 1, and the field management section 21A includes functional blocks such as a water level management section 21B, a water level calculation section 21C, and a water supply control section 21D. We are prepared.

The field water management server 21 is equipped with a CPU board, a memory board, a communication board, a storage device, etc., and the application program stored in the memory provided on the memory board is executed by the CPU mounted on the CPU board. , each of the above-mentioned functional blocks is implemented.

The field management unit 21A is a functional block that manages the state of each field 1, and manages identification information that uniquely identifies each field 1, operation information, and water supply information. The identification information includes a management number, location information indicating the position of the field, field area, owner information, and the like. Operation information is information that identifies whether cultivation is in progress or fallow, and if cultivation is in progress, the cultivar, cultivation stage such as puddling, deep water management, shallow water management, mid-drying, intermittent watering, falling water, etc., and information on each cultivation stage. Contains information for managing target schedules, etc. In addition, if the water temperature is higher than the above or abnormally low, irregular management information such as running water is also included.

The water supply information is information indicating the water supply status of each field 1, and includes a set water level that is an appropriate target according to each growth stage, the current water level, the opening degree of the water tap, and the like. The set water level is input from the farmer's terminal device 8 and refers to the drainage water level at which the drain plug provided in the drainage device 4 is adjusted. Management information including identification information, operation information, and water supply information is managed in memory, and is input from the initial input and subsequent update input from the terminal device 8 owned by the farmer, as well as input from the water level calculation unit 21C and the water supply control unit 21D. managed based on

The water level calculation unit 21C is a functional block that receives water level information from the water level sensor 6 provided in each field 1 and calculates the water level of each field 1. This is a functional block that remotely controls the opening and closing of the built-in automatic water faucet to adjust the current water level calculated by the water level calculation unit 21C to the set water level, which is the target water level.The water level management unit 21B controls the water level of each field 1. This is a functional block that remotely controls the water distribution device 4 provided in each field 1 to adjust the height of water distribution by the drain valve to the target water level.

[Details of water level calculation]
Usually, in a field arranged along the water supply pipe 100, the water supply device 4 is arranged at one corner near the water supply pipe 100, and the water level sensor 6 is arranged near the corner. The system is configured to perform water supply control for each farm field 1 as necessary so that the water level in the farm field, which has decreased due to the influence of the water reduction depth, is restored to the set water level.

However, when the field is affected by wind, a water level gradient occurs in which the water level is lower on the windward side and higher on the leeward side even in the same field 1. Therefore, if there is a difference in the water level detected depending on the position where the water level sensor 6 is installed, it may become difficult to adjust the water level in the field 1 to the set water level.

Therefore, the water level calculation unit 21C is configured to calculate a field water level that suppresses the influence of the water level gradient caused by wind, based on the water level information detected by the plurality of water level sensors 6 provided in the field group 10. ing.

An example of the field group 10 is shown in FIG. 4(a). Irrigation water taken from a water source 130 is distributed to two field groups 10A, 10B via water distribution pipes 120, 122 and water supply pipe 100 by two pressure pumps 131P. Each field group 10A, 10B is composed of 12 fields 1, and each field 1 is equipped with a water supply device 2 incorporating an automatic water supply tap and a drainage device 4 incorporating an automatic drain tap. . A water level sensor 6 is installed near the water supply device 2.

In both of the field groups 10A and 10B, the fields 1 are arranged on both sides along the water supply pipe 100 from the upstream side to the downstream side, and the drainage channel 9 is provided on the opposite side of the bank from the bank in contact with the water supply pipe 100. ing. In each field 1, a water supply device 2 is installed in a corner close to the ridge in contact with the water supply pipe 100, and a drainage device 4 is installed in a corner close to the ridge in contact with the drainage channel 9.

Both of the two farm fields 10A and 10B shown in FIG. 4(a) face each other in the north and south with the water supply pipe 100 in between, and the farm fields 1 are arranged so as to be aligned in the east and west directions. In other words, a plurality of fields are arranged in the same arrangement direction. Focusing on the four fields 1 adjacent to each other in the north, south, east, and west, in the northwest field 1, the water level sensor 6a is placed in the southwest corner, in the northeast field 1, the water level sensor 6b is placed in the southeast corner, and in the southwest field 1, the water level sensor 6b is placed in the southwest corner. A water level sensor 6c is arranged at the corner, and in the southeastern field 1, a water level sensor 6d is arranged at the northeast corner.

If there is no large difference in the set water level and water reduction depth of these four fields 1 adjacent to each other in the north, south, east, and west, the water levels detected by each water level sensor 6a, 6b, 6c, and 6d are shown in FIG. 4(b). Thus, the water level can be considered to be the same as the water level when the water level sensors 6a, 6b, 6c, and 6d are installed at the four corners of the same field 1.

The water level calculation unit 21C inputs the values of the water level sensors 6a, 6b, 6c, and 6d and sets the average value thereof as the water level of each field 1, thereby suppressing the influence of the water level gradient caused by the wind. The field water level can be obtained, and even if only one water level sensor 6 is installed in each field 1, substantially the same effect as four water level sensors 6 can be obtained.

The water supply control unit 21D performs water supply control based on the water level calculated by the water level calculation unit 21C in this way, so that each field 1 can be supplied with water up to the set water level.

In this example, the water level sensors 6a, 6b, 6c, and 6d are installed at each corner of the field 1, and the average value calculated by the water level calculation unit 21C is treated as the water level 1 of each field. 6a, 6b, 6c, and 6d may be installed at relatively different positions in the field 1, and do not need to be installed at the corners. Further, although it is preferable that the water level sensors 6a, 6b, 6c, and 6d be installed near the water supply device 2, they do not need to be near the water supply device 2.

If the shape of the field 1 and the installation position of the water level sensor 6 are known in advance, the water level gradient can be calculated from the water level detected by each water level sensor 6 and its location, so the average water level of the field 1 can be calculated from these values. can be calculated. In this way, when calculating the water level gradient occurring in the field 1, it is sufficient that the values of at least three water level sensors 6 can be detected. The water level sensors 6 may be installed at relatively different positions in each field 1.

That is, the three water level sensors 6 are at least one sensor 6 installed in a corner close to the water supply pipe 100 on the upstream side of the water supply pipe 100 in a pair of fields 1 arranged to face each other with the water supply pipe 100 in between. and one sensor installed in a corner of the pair of fields 1 adjacent to the pair of fields 1 with the water supply pipe 100 in between, on the downstream side of the water supply pipe and close to the water supply pipe.

The 12 fields 1 constituting the two field groups 10A and 10B face north and south across the water supply pipe 100, and the fields 1 are arranged so as to be aligned east to west, so the set water level and water reduction depth can be adjusted. If there is no large difference between the water level sensors 6a, 6b, 6c, and 6d for each of the 12 fields, for example, the water level sensors 6a are installed only in one set of three fields 1 adjacent to each other in the north, south, east, and west. , 6b, 6c, and the water level calculated by the water level calculation unit 21C can be used as the water level of the 12 fields 1.

In other words, among these 12 fields 1, the water level sensors 6 may be provided at relatively different positions for the fields 1 where there is no large difference in the set water level and the water reduction depth.

As long as the fields belong to the same field group, non-adjacent fields may be included. In the example shown in FIG. 4(a), three fields 1 adjacent in the east and west on the north side of the water pipe 100 in the field group 10A are set as a set, and the water level sensors 6 are installed at different positions relative to each field 1. May be installed.

Further, the fields 1 do not have to be adjacent to each other with the water supply pipe 100 in between. That is, the plurality of water level sensors 6 are three water level sensors installed in each of at least three fields 1 located so as to face two mutually intersecting sides and/or corners of one field 1, It is only necessary to include water level sensors installed at different corners of each field 1 or at relatively different positions.

In order to detect a plurality of water levels corresponding to the water level gradient, it is sufficient to include at least a first water level sensor that detects the windward water level and a second water level sensor that detects the leeward water level.

The first water level sensor and the second water level sensor may be installed in the same field, or may be installed in different fields. For example, instead of installing the water level sensor 6 in each of the four fields 1 adjacent to each other in the north, south, east, and west as shown in FIG. This includes a mode in which four water level sensors 6 are installed, and no water level sensors 6 are installed in the other three fields 1. One field where the water level sensor 6 is installed can be positioned as a field representative of the other three fields 1.

At least one of the plurality of water level sensors 6 may be a water level sensor installed in a field other than the water supply target field. It is now possible to calculate the water level of a field to be watered based on the value of a water level sensor installed in a field different from the field to be watered, and there is no need to increase the number of water level sensors installed in each field.

FIG. 5 shows three field groups 10A, 10B, and 10C arranged in the same arrangement direction. The arrangement directions of the fields 1 constituting the field groups 10A and 10B are the same, but the arrangement directions of the fields 1 constituting the field group 10C are different from those of the field groups 10A and 10B.

In such a case, the water level calculation unit 21C calculates the water level based on the detected water level of the plurality of water level sensors 6 installed at different relative positions in the plurality of fields 1 for each group of fields having the same arrangement direction. The field water level may be calculated in such a way that the influence of the water level gradient caused by the wind is suppressed.

In this example, a plurality of fields 1A belonging to a field group 10A, a plurality of fields 1B belonging to a field group 10B, and a plurality of fields 1C belonging to a field group 10C have different relative positions, and a plurality of water levels are set. The sensor 6 may be installed. For example, a combination of a field 1B belonging to the field group 10B and a field 1C belonging to the field group 10C is excluded because the water level gradient appears differently.

Among the farm fields 10B shown in FIG. 5, the farm field 1 at the southwest corner is shaped like a scalene quadrilateral and is not rectangular like the other fields. In this way, the actual field 1 has various shapes such as a triangle and a pentagon. If the shape and area of the field 1 differ, the generated water level gradient will also differ. Therefore, in addition to the sameness in the arrangement direction, the present invention is applied to a plurality of farm fields 1 that have substantially the same shape and area, or whose shape and area are within a preset tolerance range. It is preferable to do so.

Note that even if the field has a different shape or area, it is possible to determine that the water level before the start of water supply is equivalent to the water level calculated for the field to which the present invention is applied. Thereafter, the water supply amount can be calculated from the opening degree of the water tap and the water supply time controlled by the water supply control unit 21D, so by dividing the calculated water supply amount by the field area, the water level increased by water supply can be calculated.

The water level calculation unit 21C can calculate the field water level when the wind speed acquired from the meteorological data center is equal to or higher than the reference wind speed, and when the wind speed is lower than the reference wind speed, the water level measured by one preset water level sensor can be adopted as the field water level. preferable.

It is preferable that the water level calculation unit 21C calculates the field water level by determining that a non-negligible water level gradient has occurred in the field when the wind speed obtained from the meteorological data center is equal to or higher than the reference wind speed, and when the wind speed is less than the reference wind speed, the water level gradient is calculated. The water level measured by one preset water level sensor is determined to be no problem and is used as the field water level.

The embodiment described above is only an example of the present invention, and the technical scope of the present invention is not intended to be limited by the description, and the design can be modified as appropriate within the scope of achieving the effects of the present invention. Needless to say.

1: Field 2: Water supply device 3: Headrace channel 6: Water level sensor 8: Terminal 10: Field group 20: Field water management system 21: Field water management device (field water management server)
21A: Field management section 21B: Water level management section 21C: Water level calculation section 21D: Water supply control section 100: Water supply pipe 120: Water pipe (main line)
121: Water pipe (branch line)
122: Distribution reservoir 130: Water source pond 131: Pumping station 131P: Lifting pump (pressure pump)
200: Water supply and drainage management system

Claims (5)

A field water management device that manages water supply to each field in a field group consisting of a plurality of fields,
a water level calculation unit that calculates the current water level of the field to be watered;
a water supply control unit that controls opening and closing of an automatic water faucet provided in the water supply target field so that the current water level calculated by the water level calculation unit becomes the set water level;
Equipped with
The water level calculation unit includes a sensor installed in a corner of a pair of fields facing each other with a water supply pipe in between, and a sensor installed in a corner close to the water supply pipe on the upstream side of the water supply pipe; Based on water level information detected by at least three water level sensors, including a sensor installed in a corner of a pair of fields adjacent to a pair of fields on the downstream side of the water supply pipe and close to the water supply pipe, A field water management device that calculates a field water level that suppresses the influence of water level gradient caused by the water level gradient. The water level calculation unit suppresses the influence of a water level gradient caused by wind, based on water level information detected by a plurality of water level sensors provided in a plurality of fields arranged in the same arrangement direction among the farm fields. The field water management device according to claim 1, wherein the field water management device calculates the field water level. 3. The field water management device according to claim 1, wherein the plurality of water level sensors include at least a first water level sensor that detects a windward water level and a second water level sensor that detects a leeward water level. The field water management device according to any one of claims 1 to 3, wherein at least one of the plurality of water level sensors is a water level sensor installed in a field other than the water supply target field. The water level calculation unit calculates the field water level when the wind speed obtained from the meteorological data center is equal to or higher than a reference wind speed, and when the wind speed is lower than the reference wind speed, the water level measured by one preset water level sensor is adopted as the field water level. The field water management device according to any one of claims 1 to 4 , characterized by:

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