JP2863479B2 - Water management system for sloping paddy fields - Google Patents

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 fixed water level and maintaining the water at the water level for each of the paddy fields provided in steps on a slope.

[0002]

2. Description of the Related Art Paddy fields formed on sloping land are formed horizontally and arranged in steps so as to secure irrigation water. In each paddy field provided on such a slope, the water in the reservoir is usually supplied to the uppermost paddy field, and irrigated by `` Takoshi irrigation '', which is sequentially supplied to each downstream paddy field. I have.

[0003]

In such an irrigation method, since the irrigation is performed in order from the upstream paddy, fertilizers, pesticides and the like in the upstream paddy are removed together with the water in the downstream. There is a possibility that the fertilizer may be supplied to the paddy fields, and there is a problem that it is not easy to apply fertilizer and pesticides to the downstream paddy fields.

[0004] Further, since the water is supplied sequentially from the upstream side to the downstream side, it is not easy to control the water level in each paddy field, which requires a great amount of work time. There's a problem. Moreover, it is not easy to equalize the water level in each paddy field even if much time is spent.

[0005] Further, since the water is supplied sequentially from the upstream paddy to the downstream paddy, the temperature of the water may fluctuate greatly during the supply due to the influence of the temperature and the like. As a result, the temperature of the water greatly changes depending on the season and the like, and abnormally high temperature water or abnormally low temperature water is supplied to the paddy field, which may cause poor rice growth.

[0006] Japanese Patent Application Laid-Open No. Hei 5-30869 discloses a method for automatically supplying water to a plurality of paddy fields. In this water supply method, a water supply weir is provided between each of a plurality of paddy fields provided on a horizontal ground and an irrigation canal, and a downstream weir is provided downstream of each irrigation canal from each of the irrigation weirs. Are automatically opened and closed. In such a water supply method, a water supply weir and a downstream weir must be installed for each paddy field, and there is a problem that construction for the installation is not easy.

Further, Japanese Patent Application Laid-Open No. 63-7334 discloses a water management system in which water intake means are provided between a water channel and each paddy field, and each water intake means is controlled by a control means. In such a management system,
A complicated and large-scale intake system must be installed for each paddy field.
Further, there is a problem that control of each water intake means is not easy.

Japanese Patent Publication No. 4-48126 discloses an apparatus for supplying water from a water tank to a buried pipe provided in a paddy field and supplying the water from the buried pipe to the paddy field at a constant water level. I have. The device disclosed in this publication has a complicated configuration, and there is a problem that it is not easy to install a device having such a complicated configuration in each paddy field provided on a slope.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a water management system capable of irrigating each paddy field on a slope to a constant water level by a simple operation. .

[0010] Another object of the present invention is to provide a water management system for an inclined paddy field in which a lower paddy field is not likely to be affected by pesticides or the like in the upper paddy field and is not likely to be affected by a temperature change of the water used due to climate. It is to provide a system.

[0011]

According to the first aspect of the present invention, there is provided an irrigation water management system for supplying irrigation water to a fixed water level to each of paddy fields provided in a stepwise manner on a slope. At the bottom of each paddy, buried pipes are buried from the upper ridge to the lower ridge, respectively, and installed on the upper ridge of each paddy, and the water supplied inside is supplied to each paddy. A water level adjuster that supplies water to a set predetermined water level and discharges surplus water to each of the buried pipes buried at the bottom of the paddy field. Water level installed on the upper ridge
The water is supplied to the water conditioner and the water in each
However, each buried pipe is buried at the bottom of each paddy field.
To be supplied to the water level adjusters provided on the levee
It is characterized by having become .

According to a second aspect of the present invention, in each of the water level adjusters, the water level supplied to each of the water level adjusters is higher than a predetermined water level set for the water supplied to each of the paddy fields. Water level sensors for detecting that the water level has become low are provided, and water is forcibly supplied to the uppermost paddy field based on the detection result of each water level sensor.

According to a third aspect of the present invention, there is provided a water management system for supplying water to a fixed water level to each of the paddy fields provided in a step-like manner on the slope, wherein the water is supplied to the bottom of each paddy field. , Which are buried from the upper ridge to the lower ridge, respectively, and are installed on the ridge between the vertically buried pipes with drainage pipes that communicate with each paddy, and the paddies vertically adjacent to each other. Are connected to the downstream end of the buried pipe buried in the bottom of the upper paddy field and the upstream end of the lower paddy field, respectively, in the buried pipe buried in the bottom of the upper paddy field. Supply water through each drainage pipe section so as to reach a predetermined water level set in each paddy field, and excess water is supplied to a buried pipe buried at the bottom of the lower paddy field. And a water level adjuster for discharging the water, A buried pipe buried in part, is characterized in that the water is to be supplied.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing a configuration of a water management system for a plurality of paddy fields provided in a stepwise manner on a slope 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 sloped land. A ridge 12 is formed between the upper rice field 11 and the lower rice field 11. In addition, on the side of each paddy field 11, there is a water channel 1 through which irrigation water flows.
3 are provided along the sloping land, and paddy fields 11 on the uppermost side
Further above, is provided a reservoir 16 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 underground and is connected to a water level adjuster 30 provided on the upper ridge 12 of the uppermost paddy field 11. Water supply pipe 15
Is provided with an opening / closing valve 22, 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 regulator 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 ridges 12 provided between the uppermost paddy field 11 and the lower paddy field 11.

The water level adjuster 30 installed on the ridge 12 above the uppermost paddy field 11 supplies the water supplied by the water supply pipe 15 to the uppermost paddy field 11, and supplies the water to the uppermost paddy field 11.
1 is irrigated, and when the level of irrigation water irrigated in the paddy field 11 reaches a predetermined level, excess irrigation 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.
The lower end of the water level adjuster 30 from which surplus water is discharged is connected to an upstream end of the water level adjuster 30. Water level adjuster 3
0 supplies irrigation water to the uppermost paddy field 11 to a predetermined water level, and supplies unnecessary irrigation water to the paddy field 11
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 paddy field 11 on the uppermost side and reaches the bottom of the ridge 12 between the paddy field 11 and the lower paddy field 11 adjacent to the paddy field 11, and is installed on the ridge 12. Connected to the water level adjuster 30. This water level adjuster 30 also has the same configuration as the water level adjuster 30 arranged on the ridge 12 above the paddy field 11 on the uppermost side.
The water supplied from 4 is supplied to the lower paddy field 11,
The paddy field 11 is irrigated to a predetermined water level. Then, when the lower rice field 11 is irrigated to a predetermined water level,
Excess water supplied to the water level regulator 30 is supplied to the buried pipe 14. This buried pipe 14 is also buried in the bottom of the irrigated lower rice paddy 11 from the upper ridge 12 to the lower ridge 12 in a substantially horizontal state.

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

The lower ridge 12 of the lowermost paddy field 11
Also, a 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 channel 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 a controller 23. The controller 23 allows the open / close valve 22 provided in a water supply pipe 15 for supplying water in the water channel 13 to the uppermost paddy field 11. Is controlled.

FIG. 3 is a partially cutaway side view showing a specific structure of the water level adjuster 30. As shown in FIG. The water level adjuster 30 has a vertical cylindrical outer cylinder 31. In the middle of the upper part of the outer cylinder 31, there is provided a receiving portion 31 a extending horizontally in a horizontal state, and in the receiving portion 31 a, a water supply pipe 15 or a buried pipe 14 arranged on the upstream side is provided. Are connected at the downstream end. 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 drainage portion 31b facing the receiving portion 31a and projecting horizontally in a concentric manner with the receiving portion 31a. The water level adjuster 30 is located in the paddy field 11 to which the drainage part 31b is to be supplied with irrigation water, and the lower part of the drainage part 31b is lower than the water level of the irrigation water in the paddy field 11. The outer cylinder 31 is installed in a vertical state on the ridge 12 on the upper side. The drain 31b does not need to be concentric with the receiving port 31a, and a flow controller may be connected to the drain 31b as appropriate.

In the upper part of the outer cylinder 31, a vertically oriented guide cylinder 38 is concentrically connected. The upper part of the guide cylinder 38 is cut out in a semi-cylindrical shape, and the inner peripheral surface thereof is exposed so as to be viewed from the outside.

A joint 32 is connected to the lower end of the outer cylinder 31 integrally with the outer cylinder 31. The joint portion 32 has a truncated conical shape whose diameter is gradually reduced toward the lower side, and the lower end portion of the support cylinder 33 is supported concentrically within the lower end portion. The support tube 33 extends through the joint portion 32 over its entire length, and its upper end is inserted into the lower end of the outer tube 31. In the support cylinder 33, a connecting pipe portion 34 is supported concentrically. Connecting pipe section 34
Is extended downward from the support cylinder 33, and one vertical end of the elbow 35 is fitted to the lower end. The other end of the elbow 35 is horizontal, and one end of the buried pipe 14 is connected to that 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 a portion A in FIG. At the upper end of the support cylinder 33, a cylindrical seal member 36 is provided.
Are fitted. The sealing member 36 is
Is mounted on the support cylinder 33 in a state where 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 the space between the outer cylinder 31 and the seal member 36 in a watertight state. Connecting tube portion 34 inserted into support tube 33
Is located near the upper end surface of the support cylinder 33, and an O-ring 34a is fitted on the outer peripheral surface thereof. The O-ring 34a seals the space between 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 supported concentrically and slidably in the vertical direction at the axial center of a seal member 36 attached to the upper end of the support cylinder 33. The inner cylinder 37 has an upper end surface and a lower end surface opened, and is in a watertight state with respect to the seal member 36.

A vertical operating rod 37a is attached to the inner peripheral surface of the inner cylinder 37. The operation 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 37 a extending upward from the inner cylinder 37 passes through a guide cylinder 38 connected to the upper part of the outer cylinder 31. The operation rod 37a passes through the upper part of the guide cylinder 38.

FIG. 5 is an enlarged view of a portion B in FIG. The semicircular upper end surface of the guide cylinder 38 is a lid 38.
a, and on the upper surface of the lid 38a,
A cylindrical portion 38c provided to protrude upward is provided. The operation rod 37a is slidably inserted through the cylindrical portion 38c, and slidably inserted through the axial center of the nut member 38b fitted into the cylindrical portion 38c, and extends above the lid 38a. . An operating handle 37b is provided at the upper end of the operating rod 37a.

An operating rod 37 inserted through an upper part of the guide cylinder 38 which is cut out so as to be viewed from the outside.
A pointer 37c is attached to a in a horizontal state.
In addition, a scale (not shown) for displaying the height position of the pointer 37c is provided along the up-down direction on the upper inner peripheral surface viewed from the outside of the guide cylinder 38. 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. The water level sensor 39 detects that the level of the water flowing into the outer cylinder 31 is
It detects that the level is lower than the upper end surface of the inner cylinder 37 and outputs a predetermined signal to the controller 23.

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 the above-described structure is configured such that the water supply pipe 15 or the buried pipe 14 provided at the bottom of the upper paddy field 11 is connected to the receiving port 31 a of the outer cylinder 31. It is arranged vertically on the ridge 12 above the paddy field 11, and the lower part is buried. In this case, the outer cylinder 31
The horizontal drainage part 31b is located in the paddy field 11 located below the ridge 12, and its lower inner peripheral surface is
It is located above the level of 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 recognized from the outside. Further, the vertical position of the inner cylinder 37 with respect to the outer cylinder 31 is set such that the upper end surface thereof is located above the lower inner peripheral surface of the drainage portion 31b.

In such a state, when water flows into the outer cylinder 31 from the water supply pipe 15 or the buried pipe 14, the outer cylinder 3
Since the space between the inner cylinder 1 and the inner cylinder 37 is sealed by the seal member 36 and the seal ring 36b, the water flowing into the outer cylinder 31 does not flow down through the gap between the inner cylinder 37 and the inner cylinder 37. The water is discharged from the drainage portion 31b through the periphery of 37. The water discharged from the drain 31b is the paddy 1
1 and the paddy field 11 is 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
Is located above the lower inner peripheral surface of the drainage portion 31b, and further elevated above the upper end surface of the inner cylinder 37. In such a state, the water flowing into the outer cylinder 31 overflows from the upper end surface of the inner cylinder 37 to the inside. Then, the water that has flowed into the inner cylinder 37 passes through the connecting pipe portion 34 and the elbow 35 and is supplied to the buried pipe 14 connected to the elbow 37.

The water that has flowed into the buried pipe 14 is supplied to a water level adjuster 30 provided on the ridge 12 between the irrigated paddy field 11 and the lower paddy field 11. From the drainage part 31b, it is supplied to the lower paddy field 11. Hereinafter, similarly, the paddy field 11 is sequentially irrigated so as to have a predetermined water level.

The lower ridge 12 in the lowermost paddy field 11
Also, the water level adjuster 30 is installed. The drain portion 31b of the outer cylinder 31 of the water level adjuster 30 is connected to the drain pipe 17 as described above, and 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 lowermost water level adjuster 30 is supplied from the drain part 31 b to the drain pipe 17, and
The water is returned to the water channel 13.

As described above, the water is supplied to each of the paddy fields 11 provided on the sloped land in a stepwise manner up to a predetermined water level. In each of the paddy fields 11, the irrigated water is constantly supplied at a constant water level. Is held. Therefore, during the growing period of the rice, the work time performed for controlling the water level of the irrigation water in each paddy field 11 is significantly reduced.

In the water management system according to the present embodiment, the water management work which conventionally required about 30 to 40 minutes is reduced to 5 to 5.
About 10 minutes was fine.

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 the stepped paddy fields 11 are irrigated in order from the upper side, for example, the water is supplied to the inner cylinder 37 by the water level adjuster 30 for adjusting the water level of the lowermost paddy field 11.
Rice is not supplied until it reaches the upper end of
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. Thereby, the open / close valve 22 provided in the water supply pipe 15 is opened, and the water in the reservoir 16 is
The water is supplied to the uppermost paddy field 11 through the water supply pipe 15.

The uppermost paddy field 11 is supplied by the water supply pipe 15.
When the water is supplied to the water, the uppermost water 11 is in a state of being irrigated to a predetermined water level, and surplus water flows into the inner cylinder 37 from the drainage part 31b of the water level adjuster 30. ,
The water is supplied into a buried pipe 14 buried in 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. Also in this case, since the paddy field 11 irrigated by the water level regulator 30 to which the water has been supplied has already reached the predetermined water level, surplus water flows into the inner cylinder 37 and the buried pipe 14 is Then, the water is supplied to the water level adjuster 30 for adjusting the water level of the lower paddy field 11 sequentially.

In the same manner, water is supplied to the water level adjuster 30 for adjusting the water level of the lowermost paddy field 11, and the lowermost paddy field 11 is irrigated. And the lowest paddy field 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 on-off valve 22 provided on the water supply pipe 15. .

When it is detected that the water level in any one of the paddy fields 11 is lowered, not only in the lowermost 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, and the water level of the lowered paddy field 11 is raised.

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

FIG. 6 is a schematic diagram showing the configuration of another embodiment of a 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, buried pipes 14 are buried in the ground in a substantially horizontal state from the upper ridge 12 to the lower ridge 12 at the bottom of each paddy field 11, 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 field 11, and the water supply pipe 15 is connected to the water channel 13 so that the water of the water channel 13 flows in. ing. The water supply pipe 15 is provided with an opening / closing valve 22, and the water flowing into the water supply pipe 15 passes through the water supply pipe 15 when the opening / closing valve 22 is opened, and the uppermost paddy field 1
The water is supplied to a water level adjuster 30 arranged on the upper side of 1. Then, the water supplied to the water level adjuster 30 is supplied into the buried pipe 14 buried at the bottom of the paddy field 11 on the uppermost side.

The buried pipe 14 has a drain pipe 1 vertically extending 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 field 11 is provided with a water level adjuster 30 provided on the ridge 12 provided between the paddy field 11 and the lower paddy field 11.
It is connected to the. The water level adjuster 30 is also provided at the bottom of the lower paddy field 11 in a buried pipe 14 which is buried in a horizontal state.
It is connected to the. Each buried pipe 14 provided at the bottom of each paddy field 11 is also provided with a drain pipe section 14a that extends vertically upward so as to communicate with the paddy field 11.

A drain pipe 17 is connected to a water level adjuster 30 disposed on the lower ridge 12 below the lowermost paddy field 11. The water discharged from the water level adjuster 30 is a drain pipe. 17 to the drain 25, and the drain 2
5 is returned to the water channel 13.

FIG. 8 is a partially cutaway side view showing a water level adjuster 30 used in the water management system of the present embodiment. This water level adjuster 30 is different 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,
7 has the same configuration except that the water level sensor 39 is not provided on the upper end surface.

In the water level adjuster 30 having such a configuration, the buried pipe 14 or the water supply pipe 15 provided at the bottom of the upper paddy field 11 is connected to the receiving port 31a of the outer cylinder 31, and Ridge 12 provided between paddy field 11 and lower paddy field 11, or ridge 1 above paddy field 11 on the uppermost side.
2, they are arranged vertically, and the lower part is buried in the ridge 12. In this case, 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 recognized from the outside.

The water flowing from the buried pipe 14 into the outer cylinder 31 is supplied between the outer cylinder 31 and the inner cylinder 37 by a seal member 36 and a seal ring 36b for sealing between the outer cylinder 31 and the inner cylinder 37. Without flowing down, the water is stored between the two, and the level of the stored water is equal to the inner cylinder 37.
When it passes over the upper end surface of the inner cylinder 37, it flows into the inner cylinder 37. Inner cylinder 37
The water that has flowed into the inside of the connecting pipe portion 34 and the elbow 3
5, and flows into a buried pipe 14 provided at the bottom of the lower paddy field 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
Is set higher than the upper position of the buried pipe 14 provided at the bottom of the paddy field 11 in the upper stage, the water flowing through the buried pipe 14 is drained by the drain pipe section 14a.
And flows into the paddy field 11. Thereby, paddy field 11
Water is supplied inside and irrigation is performed. And paddy field 11
When the water supplied to the inside reaches the same level as the upper end face of the inner cylinder 37, the water flowing into the outer cylinder 31 from the buried pipe 14 overflows into the inner cylinder 37 from the upper end face of the inner cylinder 37. And the buried pipe 1 placed at the bottom of the lower rice paddy 11
4.

Therefore, the inner cylinder 3 in each water level adjuster 30
By setting the height position of the upper end face of 7 to be equal to the required water level of irrigation water in the upper paddy field 11, the upper paddy field 11 is irrigated with water from the buried pipe 14 to the water level. You. 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 by the water level adjuster 30 into the buried pipe 14 arranged at the bottom of the lower paddy field 11. To the lower paddy field 11 from the drain pipe section 21 of the buried pipe 14.
Is supplied with water. The lower rice paddy 11 has a water level adjuster 30 provided on the ridge 12 below the lower paddy paddle 11.
Thus, the water is supplied to a predetermined level.

As described above, the water is supplied to each of the paddy fields 11 provided on the sloping land in a stepwise manner to a predetermined level, and the water level of the water is always maintained at the level. Therefore, each paddy field 11 is always in a state of being irrigated to a predetermined level, and in such a state, rice is grown in each paddy field. The time required for the water level management of the river is greatly reduced.

Also in this embodiment, the conventional 30 to 4
Water management work that required about 0 minutes of work time was 5-1
It was shortened to about 0 minutes. In addition, since the water is supplied by using the slope of the slope and is maintained at a constant water level, no special equipment for water supply is required, which is economical.

Each paddy 11 is supplied from a buried pipe 14 buried at the bottom of the paddy 11, and the lower paddy 11 is not supplied into the upper paddy 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 the conventional paddy irrigation where the water is supplied to the lower paddy. The fertilizers and pesticides sprayed on the paddy field do not flow to the lower paddy fields, and in each paddy field, fertilizers and pesticides can be applied without being affected by the upper paddy fields.
In addition, since the supplied water flows through the buried pipe 14 buried in the bottom of the paddy field 11, it is possible to suppress the influence of ambient temperature fluctuation due to weather and the like,
There is no possibility that abnormally low temperature water or abnormally high temperature water is supplied to the paddy field 11, which is suitable for growing rice.

[0058]

The water management system for sloping land according to the present invention comprises:
As described above, by the simple operation of setting the water level by each water level adjuster, each paddy field can be irrigated to a constant water level at all times, and the time required for water management work is significantly reduced. In addition, since water is supplied to each paddy field through the buried pipe, the supplied water is hardly affected by pesticides and fertilizers by the upper paddy field, and the temperature due to climate Changes are also suppressed.

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

[Brief description of the 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 broken 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.

FIG. 5 is an enlarged view of a portion B shown in FIG. 3;

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

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

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

[Description of Signs] 11 Paddy field 12 Levees 13 Waterway 14 Buried pipe 14a Drainage pipe part 15 Water supply pipe 16 Reservoir 22 Opening / closing valve 23 Controller 30 Water level adjuster 31 Outer cylinder 31a Receptacle 31b Drainage part 33 Support cylinder 34 Connecting pipe part 35 Elbow 36 Seal member 37 Inner cylinder 37a Operation rod 39 Water level sensor

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiaki Watanabe 109-2, Oshiguchi, Arai-sha, Wakabayashi-ku, Sendai-shi, Miyagi (72) Inventor Iwao Nakazawa 1-113-20, Tomizawa, Taishiro-ku, Sendai-shi, Miyagi (58) Field surveyed (Int. Cl. ⁶ , DB name) A01G 25/00 501 E02B 13/02

Claims (3)

(57) [Claims] 1. A water management system for supplying water at a constant water level to each of rice fields provided in a step-like manner on an inclined land, wherein a water level is provided at a bottom of each rice field from an upper ridge. The buried pipe is buried over the ridge on the side and the ridge on the upper side of each paddy is installed respectively.
A water level adjuster that supplies the water supplied to the inside of the paddy field until it reaches a predetermined water level, and discharges excess water to each buried pipe buried at the bottom of the paddy field; The water is supplied to the water level adjuster installed on the upper ridge of the uppermost paddy field, and the water in each buried pipe is
These buried pipes are installed on the ridge below each paddy buried at the bottom.
Water level adjuster
Water Management System slopes paddy, characterized in that that. 2. Each water level adjuster is provided with a water level sensor for detecting that the water level supplied to the inside of the water level is lower than a predetermined water level set for the water supplied to each paddy field. The water management system according to claim 1, wherein the water is forcibly supplied to the uppermost paddy field based on a detection result of each water level sensor. 3. A water management system for supplying water to a fixed water level to each of rice fields provided in a stepwise manner on an inclined land, wherein a water level is provided at a bottom of each rice field from an upper ridge. The buried pipes are buried over the ridges on the side, and drain pipes are respectively provided to communicate with each paddy field. Water connected to the downstream end of the buried pipe buried at the bottom and the upstream end of the lower paddy field, and flowing through the buried pipe buried at the bottom of the upper paddy field,
A water level that is supplied through each drainage pipe section to a predetermined water level set in each paddy field, and that excess water is discharged to a buried pipe buried at the bottom of the lower paddy field. And a regulator, wherein water is supplied to a buried pipe buried at the bottom of the uppermost paddy field.