JPH08336336A - Water-controlling system for rice paddies on inclined land - Google Patents

Abstract

PURPOSE: To enable easy irrigation at a certain water level in each rice plant paddy on the inclined land. CONSTITUTION: A water-level regulator 30 is installed at the levee 12 on the upper side in each rice paddy 11 which is arranged stepwise along an inclined land. To the uppermost water level regulator 30, water is supplied from the reservoir 16 until the water reaches a prescribed level in the uppermost paddy 11. This level regulator 30 is linked to the pipe 14 buried in the ground of the uppermost paddy 11 and discharge the excessive water to the buried pipe 14, after the water attains the prescribed level. Another water level regulator 30 is also connected to the downstream end of the buried pipe 14 and the water fed to the buried pipe 14 is supplied to the subjacent rice paddy 11 until the subjacent paddy 11 is filled with water at a certain level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water management system capable of supplying water to a certain water level for each paddy field provided in a staircase on a slope and maintaining the water at the water level.

[0002]

2. Description of the Related Art Paddy fields formed on sloping land are horizontally formed and arranged in a staircase so as to secure water. Each paddy field on such a sloping land is normally irrigated by "Tagoe irrigation", which supplies the water from the reservoir to the uppermost paddy field and sequentially supplies it to each downstream paddy field. There is.

[0003]

In such an irrigation method, since the upstream paddy fields are irrigated in order, fertilizers, pesticides, etc. in the upstream paddy fields are used together with irrigation water in the downstream side. There is a problem that it may be supplied to paddy fields, and fertilization and pesticide management of downstream paddy fields are not easy.

Further, since the water is supplied from the upstream side to the downstream side in sequence, it is not easy to control the water level in each paddy field, which requires a lot of work time. There's a problem. Moreover, even if it takes a lot of work time, it is not easy to make the water level equal in each paddy field.

Further, since the water is supplied successively from the upstream paddy to the downstream paddy, the temperature of the water may change greatly during the supply due to the influence of the temperature and the like. As a result, the temperature of the irrigation water fluctuates greatly depending on the season and the like, and abnormally high-temperature water or abnormally-low temperature water is supplied to the paddy fields, which may lead to poor growth of rice.

Japanese Unexamined Patent Publication No. 5-30869 discloses a method of automatically supplying water to a plurality of paddy fields. In this water supply method, a water supply weir is provided between each of the plurality of paddy fields on the horizontal ground and the irrigation canal, and a downstream weir is provided on the downstream side of the irrigation canal with respect to each of the water supply weirs. Is automatically opened and closed. Such a water supply method has a problem that a water supply weir and a downstream weir must be installed for each paddy field, and construction for the installation is not easy.

Further, Japanese Patent Laid-Open No. 63-3734 discloses a water management system in which water intake means is provided between a water channel and each paddy field, and each water intake means is controlled by a control means. Even with such a management system,
There is a problem that construction work is not easy because it is necessary to install a complex and large-scale water intake means for each paddy field.
Further, there is a problem that it is not easy to control each water intake means.

Japanese Patent Publication No. 4-48126 discloses a device for supplying water from an aquarium to a buried pipe provided in a paddy field and supplying the water from the buried pipe to the paddy field to a constant water level. There is. The device disclosed in this publication has a complicated structure, and there is a problem that it is not easy to install the device having such a complicated structure in each paddy field provided on the sloping land.

The present invention solves such a problem, and an object thereof is to provide a water management system capable of irrigating each paddy field in a sloping land to a constant water level by a simple operation. .

Another object of the present invention is to manage water in a sloping paddy field in which the lower paddy field is not affected by pesticides in the upper paddy field and is not affected by the temperature change of the water due to climate. To provide a system.

[0011]

The invention according to claim 1 is a water management system adapted to supply water to a constant water level to each paddy field provided in a stepwise manner on a sloped land. , At the bottom of each paddy field, buried pipes are buried from the upper ridge to the lower ridge, and the upper ridge of each paddy is installed, and the water supplied inside is supplied to each paddy. It is equipped with a water level adjuster that supplies up to the set predetermined water level and discharges excess water into each buried pipe buried in the bottom of the paddy field. The water is supplied to a water level adjuster installed on the upper ridge.

In the water management system for sloping paddy fields according to the second aspect of the present invention, the water level of the water supplied to each water level adjuster is higher than the predetermined water level set for the water supplied to each paddy field. Each water level sensor is provided to detect that the water level has dropped, and water is forcibly supplied to the uppermost paddy field based on the detection result of each water level sensor.

The invention according to claim 3 is a water management system adapted to supply water to a certain water level to each paddy field provided in a staircase on a sloping land, and at the bottom of each paddy field. , It is buried from the upper ridge to the lower ridge, and it is installed on the ridge between the vertically adjacent paddy fields and the buried pipes with drainage pipes that connect to each paddy field. Are connected to the downstream end of the buried pipe buried at the bottom of the upper paddy field and the upstream end of the lower paddy field, respectively, inside the buried pipe buried at the bottom of the upper paddy field. The water flowing through it is supplied to each paddy field through each drainage pipe so as to reach the predetermined water level, and the surplus water is supplied to the buried pipe buried in the bottom of the paddy field in the lower stage. Equipped with a water level adjuster designed to discharge the A buried pipe buried in part, is characterized in that the water is to be supplied.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic view showing the structure of a water management system for a plurality of paddy fields provided in a stepwise manner on a sloped land according to the present invention, and FIG. 2 is a schematic sectional view thereof. A plurality of horizontal paddy fields 11, 11, ... Are provided in a stepped manner on the sloping land. The ridges 12 are formed between the upper paddy field 11 and the lower paddy field 11, respectively. In addition, on the side of each paddy field 11, a water channel 1 through which water flows
3 is provided along the sloping land, and the topmost paddy field 11
Further above, a reservoir 16 is provided so that the water flows from the water channel 13.

A water supply pipe 15 for supplying water to the uppermost paddy field 11 is connected to the reservoir 16. The water supply pipe 15 is buried in the ground and is connected to the water level adjuster 30 provided on the upper ridge 12 of the uppermost paddy field 11. Water supply pipe 15
An opening / closing valve 22 is provided in the water tank, and the water in the reservoir 16 is supplied to the uppermost paddy field 11 via the water supply pipe 15 and the water level adjuster 30 by opening the opening / closing valve 22. It has become. The water supplied to the uppermost paddy field 11 is configured so as not to flow into the lower paddy field 11 by the ridge 12 provided between the paddy field 11 and the lower paddy field 11.

The water level adjuster 30 installed on the upper ridge 12 of the uppermost paddy 11 supplies the water supplied by the water supply pipe 15 to the uppermost paddy 11 so that the paddy 1
1 is irrigated, and when the water level of the irrigated water in the paddy field 11 reaches a predetermined level, the surplus water is discharged downward. At the bottom of the uppermost paddy field 11, a buried pipe 14 is buried from the upper ridge 12 to the lower ridge 12 in a substantially horizontal state.
A lower end portion of the water level adjuster 30 from which excess water is discharged is connected to an upstream end portion of No. 4. Water level adjuster 3
0 supplies water to the uppermost paddy field 11 up to a predetermined water level, and surplus water that is no longer needed for the paddy field 11 is
The water is supplied to a buried pipe 14 buried in the bottom of the paddy field 11.

The buried pipe 14 passes through the bottom of the uppermost paddy 11 and reaches the bottom of the ridge 12 between the lower paddy 11 adjacent to the paddy 11 and is installed on the ridge 12. It is connected to the water level adjuster 30. This water level adjuster 30 also has the same structure as the water level adjuster 30 arranged on the upper ridge 12 of the uppermost paddy 11, and the buried pipe 1
The water supplied from No. 4 is supplied to the paddy field 11 in the lower stage,
The paddy field 11 is irrigated to a predetermined water level. When the lower paddy field 11 is irrigated to a predetermined water level,
The surplus water supplied to the water level adjuster 30 is supplied to the buried pipe 14. The buried pipe 14 is also buried in the bottom of the irrigated lower paddy field 11 from the upper ridge 12 to the lower ridge 12 in a substantially horizontal state.

In the same manner, the paddy field 11 is provided at the downstream end of each buried pipe 14 buried at the bottom of each paddy field 11.
And a water level adjuster 30 installed on the ridge 12 between the paddy field 11 on the lower tier adjacent to the paddy field 11 and the water level adjuster 30 is a buried pipe buried at the bottom of the paddy field 11 on the lower tier. The upstream end of 14 is connected.

Lower ridge 12 in the lowermost paddy 11
Also, the water level adjuster 30 is installed. This water level adjuster 3
A drain pipe 17 is connected to 0, and the water supplied to the water level adjuster 30 is returned to the water passage 13 through the drain pipe 17.

As shown in FIG. 2, inside each water level adjuster 30, a water level sensor 39 for detecting that the water supplied to each water level adjuster 30 has fallen below a predetermined level is provided. . The detection result of each water level sensor 39 is output to the controller 23, and by this controller 23, the opening / closing valve 22 provided in the water supply pipe 15 that supplies the water in the waterway 13 to the uppermost paddy field 11 is supplied. The opening and closing of is controlled.

FIG. 3 is a partially cutaway side view showing a specific structure of the water level adjuster 30. The water level adjuster 30 has a cylindrical outer cylinder 31 in a vertical state. A receiving portion 31a extending laterally in a horizontal state is provided in the middle of the upper portion of the outer cylinder 31, and in the receiving portion 31a, the water supply pipe 15 or the buried pipe 14 arranged on the upstream side. The downstream end of is connected. Therefore, the water flowing through the water supply pipe 15 or the buried pipe 14 is supplied into the outer cylinder 31.

The outer cylinder 31 is provided with a drain portion 31b facing the receiving portion 31a and protruding horizontally in a concentric state with the receiving portion 31a. The water level adjuster 30 is located in the paddy field 11 where the drainage part 31b should supply the water, and the lower part of the drainage part 31b is lower than the water level of the irrigation water of the paddy field 11. An outer cylinder 31 is vertically installed on the ridge 12 on the upper side of the. The drainage section 31b does not have to be concentric with the receiving port section 31a, and a flow rate controller may be appropriately connected to the drainage section 31b.

In the upper part of the outer cylinder 31, a guide cylinder 38 in a vertical state is concentrically connected. The upper part of the guide cylinder 38 is cut out in a semi-cylindrical shape, and its inner peripheral surface is exposed so that it can be seen from the outside.

A joint 32 is integrally connected to the lower end of the outer cylinder 31 with the outer cylinder 31. The joint portion 32 has a truncated cone shape whose diameter is gradually reduced toward the lower side, and the lower end portion of the support cylinder 33 is concentrically supported in the lower end portion thereof. The support cylinder 33 is inserted through the joint 32 over the entire length, and the upper end thereof is in a state of being inserted into the lower end of the outer cylinder 31. The connecting pipe portion 34 is supported in the support cylinder 33 in a concentric state. Connection pipe part 34
The lower end portion of the elbow 35 extends downward from the support cylinder 33, and one vertical end portion of the elbow 35 is fitted to the lower end portion thereof. The other end of the elbow 35 is horizontal, and one end of the buried pipe 14 is connected to the other end. The buried pipe 14 is buried in a substantially horizontal state from the upper ridge 12 to the lower ridge 12 at the bottom of the paddy field 11 to which water is supplied.

FIG. 4 is an enlarged view of part A in FIG. A cylindrical seal member 36 is provided on the upper end of the support cylinder 33.
Are fitted. The seal member 36 is provided on the support tube 33.
Is attached to the support cylinder 33 in a state in which the upper end surface of the is covered except for its axial center portion. The seal member 36 is provided with a flange portion 36a extending outward over the entire circumference, and a seal ring 36b is fitted between the flange portion 36a and the outer cylinder 31. Seal ring 36
b seals between the outer cylinder 31 and the seal member 36 in a watertight state. Connection pipe portion 34 inserted in the support cylinder 33
The upper end portion of is located near the upper end surface of the support cylinder 33, and the O-ring 34a is fitted to the outer peripheral surface thereof. The O-ring 34a seals the inner peripheral surface of the support cylinder 33 and the outer peripheral surface of the connecting pipe portion 34 in a watertight state.

An inner cylinder 37 is concentrically supported by an axial center of a seal member 36 attached to the upper end of the support cylinder 33 so as to be slidable in the vertical direction. The inner cylinder 37 is in a state where the upper end surface and the lower end surface are open, and is in a watertight state with respect to the seal member 36.

An operation rod 37a in a vertical state is attached to the inner peripheral surface of the inner cylinder 37. The operating rod 37a extends through the inner cylinder 37 over the entire length in the axial direction and extends above the inner cylinder 37. The upper part of the operation rod 37a extending upward from the inner cylinder 37 is inserted through the guide cylinder 38 connected to the upper part of the outer cylinder 31. The operation rod 37a is inserted through the upper portion of the guide cylinder 38.

FIG. 5 is an enlarged view of portion B in FIG. The semicircular upper end surface of the guide cylinder 38 is a lid 38.
is covered with a, and the upper surface of the lid 38a is
A tubular portion 38c is provided so as to project upward. The operation rod 37a is slidably inserted in the tubular portion 38c, and is slidably inserted in the axial center portion of the nut member 38b fitted in the tubular portion 38c, and extends above the lid body 38a. . A handle 37b for operation is provided at the upper end of the operation rod 37a.

An operating rod 37 which is inserted through the inside of the guide tube 38 which is cut out so as to be seen from the outside.
A pointer 37c is horizontally attached to a.
Further, a scale (not shown) for displaying the height position of the pointer 37c is provided on the upper inner peripheral surface viewed from the outside of the guide cylinder 38 along the vertical direction. Therefore, the height position of the upper end surface of the inner cylinder 37 with respect to the outer cylinder 31 is recognized based on the vertical position of the pointer 37c indicated by the scale.

At the upper end of the inner cylinder 37, for example, a float type water level sensor 39 is attached. In this water level sensor 39, the water level of the water flowing into the outer cylinder 31 is
A predetermined signal is output to the controller 23 by detecting that the level is lower than that of the upper end surface of the inner cylinder 37.

The water level sensor 39 is not limited to the float type, but may be an electrode type, a capacitance type, a photoelectric type or the like.

The water level adjuster 30 having such a configuration is provided with the water supply pipe 15 or the buried pipe 14 provided at the bottom of the upper paddy 11 connected to the receiving portion 31a of the outer cylinder 31. The paddy 11 is vertically arranged on the ridge 12 on the upper side, and the lower part thereof is buried. In this case, the outer cylinder 31
The drainage part 31b in the horizontal state is located in the paddy field 11 located under the ridge 12, and the lower inner peripheral surface thereof is
It is located above the water level of the irrigation water for the paddy field 11. The upper part of the guide cylinder 38 is exposed from the ridge 12, so that the scale provided on the inner peripheral surface and the pointer 37c of the operation rod 37a can be visually observed from the outside. Further, the inner cylinder 37 is set to have a vertical position with respect to the outer cylinder 31 so that the upper end surface of the inner cylinder 37 is located above the lower inner peripheral surface of the drainage portion 31b.

In this state, when the water flows from the water supply pipe 15 or the buried pipe 14 into the outer cylinder 31, the outer cylinder 3
1 and the inner cylinder 37 are sealed by the seal member 36 and the seal ring 36b, the water that has flowed into the outer cylinder 31 does not flow down through the gap between the inner cylinder 37 and the inner cylinder 37. It passes through the periphery of 37 and is discharged from the drainage part 31b. The water discharged from the drainage section 31b is used in the paddy field 1
The paddy field 11 is supplied and irrigated.

When the paddy field 11 is irrigated in this way, the water level in the paddy field 11 rises and the water level adjuster 30
The drainage portion 31b is located above the lower inner peripheral surface of the drainage portion 31b, and further above the upper end surface of the inner cylinder 37. In this state, the water flowing into the outer cylinder 31 overflows from the upper end surface of the inner cylinder 37 into the inner cylinder 37. Then, the water flowing into the inner cylinder 37 is supplied to the buried pipe 14 connected to the elbow 37 through the connecting pipe portion 34 and the elbow 35.

The water flowing into the buried pipe 14 is supplied to the water level adjuster 30 provided on the ridge 12 between the irrigated paddy field 11 and the lower paddy field 11, and the water level adjuster 30 of the water level adjuster 30 is supplied. It is supplied from the drainage part 31b to the paddy field 11 in the lower stage. Thereafter, in the same manner, the paddy fields 11 are successively irrigated so as to reach a predetermined water level.

Lower ridge 12 in the lowermost paddy 11
Also, the water level adjuster 30 is installed, but the drainage portion 31b of the outer cylinder 31 in this water level adjuster 30 is in the state of being connected to the drainage pipe 17 as described above, The end of the elbow 35 provided at the lower end is closed by a cap or the like. Therefore, the water supplied into the water level adjuster 30 on the lowermost side is supplied to the drain pipe 17 from the drain portion 31b, and by the drain pipe 17,
It is returned to the water channel 13.

In this way, each paddy field 11 provided in a stepwise manner on the sloping ground is sequentially supplied with water up to a predetermined water level, and in each paddy field 11, the irrigated water is constantly fed at a constant water level. Held in. Therefore, the working time for controlling the water level of the irrigation water in each paddy field 11 during the rice growing period is significantly shortened.

In the water management system according to the present embodiment, the water management work, which conventionally takes about 30 to 40 minutes, requires 5 to
It took about 10 minutes.

In this case, since the water stored in the reservoir 16 is supplied to each paddy 11, each paddy 11
Is supplied with warm water while being stored in the reservoir 16, which can prevent cold damage and is suitable for rice cultivation.

When irrigating the stepped paddy fields 11 in order from the upper side, for example, in the water level adjuster 30 for adjusting the water level of the lowermost paddy field 11, the water is supplied to the inner cylinder 37.
Is not supplied until reaching the upper end surface of the
When it is not possible to irrigate 1 to a predetermined water level, the water level sensor 39 provided in the water level adjuster 30 operates and a predetermined signal is output to the controller 23. As a result, the opening / closing valve 22 provided in the water supply pipe 15 is opened, and the water in the reservoir 16 is
It is supplied to the uppermost paddy field 11 via the water supply pipe 15.

The uppermost paddy field 11 by the water supply pipe 15
When the water is supplied to the uppermost water 11, the uppermost water 11 is in a state of being irrigated to a predetermined water level, and excess water flows into the inner cylinder 37 from the drainage portion 31b of the water level adjuster 30. ,
It is supplied into a buried pipe 14 buried at the bottom of the uppermost paddy field 11. Then, the water is supplied to the water level adjuster 30 for adjusting the water level of the lower paddy field 11 to which the buried pipe 14 is connected. In this case as well, since the paddy field 11 irrigated by the water level adjuster 30 to which the water has been supplied has already reached a predetermined water level, the surplus water flows into the inner cylinder 37 and the buried pipe 14 is discharged. Through it, it is sequentially supplied to the water level adjuster 30 for adjusting the water level of the lower paddy field 11.

Thereafter, similarly, water is supplied to the water level adjuster 30 for adjusting the water level of the lowermost paddy 11, and the lowermost paddy 11 is irrigated. And the bottom paddy 1
When 1 is irrigated to a predetermined water level, the water level sensor 39 of the water level adjuster 30 for the paddy field 11 detects the state, and the controller 23 closes the opening / closing valve 22 provided in the water supply pipe 15. .

When it is detected that the water level in any of the paddy fields 11 is not limited to the lowest paddy field 11, the open / close valve 22 provided in the water supply pipe 15 is opened, Water is supplied to the uppermost paddy field 11. Then, the water supplied to the uppermost paddy field 11 is sequentially supplied to the lower paddy field 11 to raise the water level of the paddy field 11 whose water level has decreased.

Further, if a solar cell is attached to the controller 23 for controlling the opening / closing of the opening / closing valve 22 provided in the water supply pipe 15 and the opening / closing valve 22 is controlled by the electric power of the solar cell, it is economical. Is.

FIG. 6 is a schematic view showing the configuration of another embodiment of the water management system for a sloping paddy field according to the present invention, and FIG. 7 is a schematic sectional view thereof. In the present embodiment, at the bottom of each paddy field 11, buried pipes 14 are buried in the ground in a substantially horizontal state from the upper ridge 12 to the lower ridge 12, respectively. The ends are connected to water level adjusters 30 arranged on the upper and lower ridges 12, respectively. A water supply pipe 15 is connected to a water level adjuster 30 provided on the upper ridge 12 of the uppermost paddy 11, and the water supply pipe 15 is connected to the water passage 13 so that the water in the water passage 13 flows in. ing. The water supply pipe 15 is provided with an opening / closing valve 22, and the water that has flowed into the water supply pipe 15 passes through the water supply pipe 15 when the opening / closing valve 22 is open and the topmost paddy field 1
1 is supplied to the water level adjuster 30 arranged above. Then, the water supplied to the water level adjuster 30 is supplied into the buried pipe 14 buried in the bottom of the uppermost paddy field 11.

The buried pipe 14 has a drain pipe portion 1 extending vertically upward so as to communicate with the paddy field 11.
4a is provided.

The buried pipe 14 provided horizontally at the bottom of the uppermost paddy 11 has a water level adjuster 30 installed on the ridge 12 provided between the paddy 11 and the lower paddy 11.
It is connected to the. And this water level adjuster 30 is also a buried pipe 14 which is buried horizontally in the bottom of the lower paddy field 11.
It is connected to the. Each of the buried pipes 14 provided at the bottom of each paddy field 11 is also provided with a drainage pipe part 14a vertically extending upward so as to communicate with the inside of the paddy field 11.

A drainage pipe 17 is connected to the water level adjuster 30 arranged on the lower ridge 12 of the paddy field 11 on the lowermost side, and the water discharged from the water level adjuster 30 is drainage pipe. It is supplied to drainage channel 25 through 17 and drainage channel 2
The water is returned from 5 to the waterway 13.

FIG. 8 is a partially cutaway side view showing the water level adjuster 30 used in the water management system of this embodiment. This water level adjuster 30 differs from the water level adjuster 30 used in the water management system of the above-described embodiment in that the outer cylinder 31 is not provided with the drainage portion 31b, and the inner cylinder 3
7 has the same configuration except that the water level sensor 39 is not provided on the upper end surface thereof.

In the water level adjuster 30 having such a configuration, the buried pipe 14 provided at the bottom of the upper paddy 11 or the water supply pipe 15 is connected to the receiving portion 31a of the outer cylinder 31 so that the upper paddy 11 and the ridge 12 provided between the lower paddy 11 or the ridge 1 above the uppermost paddy 11
2, vertically arranged and the lower part thereof is buried in the ridge 12. In this case, the upper portion of the guide cylinder 38 is exposed from the ridge 12, and the scale provided on the inner peripheral surface and the pointer 37c of the operation rod 37a are visible from the outside.

The water flowing from the buried pipe 14 into the outer cylinder 31 is passed between the outer cylinder 31 and the inner cylinder 37 by the seal member 36 and the seal ring 36b which seal the space between the outer cylinder 31 and the inner cylinder 37. It will be in a state of being stored between the two without flowing down, and the water level of the stored water will be
When it passes over the upper end surface of the, it flows into the inner cylinder 37. Inner cylinder 37
The water that has flowed into the connecting pipe portion 34 and the elbow 3
After passing through the inside of 5, the water flows into the buried pipe 14 provided at the bottom of the lower paddy 11.

The vertical position of the upper end surface of the inner cylinder 37 with respect to the outer cylinder 31 is appropriately set by operating the operating rod 37a in the vertical direction. And the inner cylinder 37
By setting the height position of the upper end face of the paddle pipe to be higher than the upper position of the buried pipe 14 provided at the bottom of the upper paddy field 11, the water flowing through the buried pipe 14 is drained from the drain pipe portion 14a.
Through it into the paddy field 11. As a result, paddy field 11
Water is supplied inside and irrigated. And paddy field 11
When the water supplied to the inside reaches the same level as the upper end surface of the inner cylinder 37, the water flowing into the outer cylinder 31 from the buried pipe 14 overflows from the upper end surface of the inner cylinder 37 into the inner cylinder 37. Then, the buried pipe 1 arranged at the bottom of the lower paddy 11
4 is supplied.

Therefore, the inner cylinder 3 of each water level adjuster 30
By setting the height position of the upper end surface of 7 to be equal to the required water level of the irrigation water in the upper paddy field 11, the upper paddy field 11 is irrigated with water from the buried pipe 14 to that water level. It When the water is supplied to the upper paddy field 11 to a predetermined level, the water flowing in the buried pipe 14 is supplied to the bottom of the lower paddy 11 by the water level adjuster 30. Is supplied to the paddy field 11 of the lower stage from the drainage pipe part 21 of the buried pipe 14.
Is supplied with water. In the lower paddy field 11, the water level adjuster 30 provided on the ridge 12 below the lower paddy field 11
The water is supplied up to a predetermined level.

In this way, water is supplied to each of the paddy fields 11 provided in a stepwise manner on the sloping ground to a predetermined level, and the water level of the water is always maintained so as to reach that level. Therefore, each paddy field 11 is constantly irrigated to a predetermined level, and rice is grown in each paddy field in such a state. The work hours carried out for the water level management in the area will be significantly shortened.

Also in the present embodiment, the conventional method of 30-4
The water management work that took about 0 minutes was 5 to 1
It was shortened to about 0 minutes. Moreover, since the water is supplied by utilizing the slope of the sloping ground and the water is maintained at a constant water level, no special equipment for water supply is required, which is economical.

Further, each paddy field 11 is supplied from the buried pipe 14 buried at the bottom of the paddy field 11, and the lower paddy field 11 is not supplied to the upper paddy field 11. Since the water is supplied through the buried pipe 14 at the bottom, the water supplied to the upper paddy is supplied to the lower paddy as in conventional paddy irrigation. Fertilizers and pesticides sprayed onto the paddy field are not likely to flow to the lower paddy fields, and fertilizers and pesticides can be applied to each paddy field without being affected by the upper paddy field.
In addition, since the supplied water flows in the buried pipe 14 buried in the bottom of the paddy field 11, it is possible to suppress the influence of the fluctuation of the ambient temperature due to the weather or the like,
There is no fear that abnormally low temperature water or abnormally high temperature water will be supplied to the paddy field 11, which is suitable for growing rice.

[0058]

The sloping water management system of the present invention is
In this way, each paddy field can be constantly irrigated to a constant water level by the simple operation of setting the water level by each water level adjuster, and the time required for the water management work is significantly shortened. Moreover, since water is supplied to each paddy field through the buried pipe, the supplied water is hardly affected by the pesticides and fertilizers from the paddy fields in the upper row, and the temperature depending on the climate. Changes are also suppressed.

Furthermore, when the water level in any of the paddy fields is not at a predetermined level, the irrigation water in each paddy field can be maintained at a predetermined water level by forcibly supplying water. Water management suitable for growth becomes possible.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an example of an embodiment of a water management system for a sloping paddy field according to the present invention.

FIG. 2 is a schematic sectional view of the water management system.

FIG. 3 is a partially cutaway side view of a water level adjuster used in the water management system.

FIG. 4 is an enlarged view of a portion A shown in FIG.

5 is an enlarged view of part B shown in FIG. 3. FIG.

FIG. 6 is a schematic perspective view showing another example of the embodiment of the water management system for sloping paddy field according to the present invention.

FIG. 7 is a schematic sectional view of the water management system.

FIG. 8 is a partially cutaway side view of a water level adjuster used in the water management system.

[Explanation of symbols]

 11 Paddy Field 12 Ridge 13 Waterway 14 Buried Pipe 14a Drainage Pipe 15 Water Supply Pipe 16 Reservoir 22 Open / close Valve 23 Controller 30 Water Level Adjuster 31 Outer Cylinder 31a Receptacle 31b Drainage 33 Support Cylinder 34 Connecting Pipe 35 Elbow 36 Sealing Member 37 Inner cylinder 37a Operation rod 39 Water level sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyochika Hoshikawa 3-403-1511, Showa-cho, Aoba-ku, Sendai-shi, Miyagi Prefecture (72) Yoshiaki Watanabe 109-2 Arai Oshiguchi, Wakabayashi-ku, Sendai-shi, Miyagi (72) ) Inventor Iwa Nakazawa 1-13-20 Tomizawa, Taishiro-ku, Sendai City, Miyagi Prefecture

Claims (3)

[Claims] 1. A water management system adapted to supply water to a certain water level for each paddy field provided in a staircase on a sloping land, wherein the bottom of each paddy field is from the upper ridge to the bottom. The buried pipes are buried along the side ridges and the upper ridges in each paddy field.
A water level adjuster that supplies the water supplied to the inside until it reaches the prescribed water level set for each paddy field, and discharges the surplus water into each buried pipe buried at the bottom of the paddy field. , Equipped with a water level adjuster installed on the upper ridge of the uppermost paddy field,
A water management system for sloping paddy fields characterized by being supplied with water. 2. Each water level adjuster is provided with a water level sensor for detecting that the water level of the water supplied inside is lower than a predetermined water level set for the water supplied to each paddy field. The water management system for a sloping paddy field according to claim 1, wherein the water is forcibly supplied to the uppermost paddy field based on the detection result of each water level sensor. 3. A water management system adapted to supply water to a certain water level for each paddy field provided in a staircase on a sloping land, the bottom of each paddy field being located at the bottom of an upper ridge. It is buried along the ridge on the side of the ridge, and is installed on the ridge between the vertically adjacent paddy fields and the buried pipe with the drainage pipe section that communicates with each paddy field. The downstream end of the buried pipe buried in the bottom and the upstream end of the lower paddy are respectively connected, and the water flowing through the buried pipe buried in the bottom of the upper paddy is supplied.
Water level is supplied to each paddy field through each drainage pipe so that the water level is set to a predetermined level, and surplus water is discharged to a buried pipe buried at the bottom of the paddy field in the lower stage. A water management system for a sloping paddy field, comprising: a regulator, wherein the water is supplied to a buried pipe buried at the bottom of the uppermost paddy field.