JP2012120510A - Device for adjusting water storage amount for paddy field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for adjusting a water storage amount for a paddy field which automatically stores a prescribed amount of water by making the paddy field function as "a paddy field dam" so as to prevent rainwater from flowing into the river during heavy rain.SOLUTION: The device for adjusting a water storage amount for a paddy field is structured as follows: a doorway for inserting an earth-retaining plate is formed at a position facing a pair of side walls; a doorway for inserting a water storage amount-adjusting plate is formed at a position almost intermediate between the doorway for inserting the earth-retaining plate and the vertical walls; the earth-retaining plate having a height almost the same as that of soil surface and a farming water level-adjusting plate having a height defined as a farming water level when placed on the earth-retaining plate, are vertically inserted into the doorway for inserting the earth-retaining plate; and the water storage amount-adjusting plate the upper end of which is formed so as to have a height almost the same as the water storage level defined as any height according to the growth condition of paddy and at the lower part of which a drainage amount-adjusting hole is bored, is vertically inserted into the doorway for inserting the water storage amount-adjusting plate. When the amount of rainfall is normal, the rainwater is discharged to a discharge path via a discharging pipe to keep the paddy field have the farming water level. When having heavy rainfall, the rainwater is stored up to the highest water storage level defined as a height equivalent to an amount obtained by adding an overflow height to the water storage amount-adjusting height.

Description

  The present invention relates to a water storage amount adjusting device for paddy fields for a “paddy dam” that prevents a flood by storing a certain amount of rainwater in a paddy field during heavy rain.

  In recent years, due to the effects of global warming, guerrilla-like torrential rains have increased, and flood damage due to rain that falls intensively in this short time has occurred frequently. However, conventional flood control measures such as dams, river repairs, and reservoirs as flood countermeasures are very expensive, and it is difficult to respond to local heavy rains.

  As a countermeasure against such heavy rain, a “paddy dam” using paddy fields has been proposed. This is intended to mitigate inundation damage to residential areas and fields in the downstream area by temporarily storing rainwater in paddy fields during heavy rains and controlling the outflow of rainwater into rivers.

  The adjustment of the water level of the paddy drainage so far has been done by changing the height of the water level adjustment plate. In the case of such drainage so far, the rain that has fallen passes through the water level adjusting plate 22 (see FIG. 5) and is drained from the drain pipe to the drainage channel, and the water level is kept constant. Due to this structure, when it rains, the rain immediately flows into the drainage channel, and in the case of torrential rain, the rain falls from the drainage channel to the river in a short time, resulting in flooding. is doing. (See Figure 5)

  The conventional technology improved to prevent the occurrence of such floods is that paddy water is introduced from the upper drainage port of the drainage pipe and drained from the lower drainage port to the paddy field drainage unit of the paddy field. And a water level setting device for paddy fields that sets the water level of the paddy field by setting the height of the upper drainage port, and the main body cylinder is connected to a mounting pipe that is connected to the paddy drainage. The main body cylinder part has a movable pipe that can be raised and lowered relative to the attachment pipe, and a limit drain port part is provided on the upper part of the main body cylinder part. A peripheral drainage port smaller than the limit drainage port is provided on the lower peripheral surface, and this peripheral drainage port or the limit drainage port is provided as the upper drainage port, so that the water of the paddy field that is increased by rainwater is supplied. Drain from the peripheral drainage port to maintain the water level of the paddy field. However, if the amount of increase in the paddy field due to this rainwater exceeds the amount of drainage from the peripheral drainage port, the water level of the paddy field rises and the amount of water increase until reaching the water level drained from the limit drainage port is stored in the paddy field. A paddy field water level setting device configured as described above has been proposed (see Patent Document 1).

JP 2010-22324 A

  (1) In conventional drainage dredges, rainwater exceeding the farming water level immediately flows from the drainage channel into the river. As a result of heavy rain, the river level rises in a short time and flooding occurs. For this reason, it is necessary to replace the water level adjustment plate in order to store rainwater in a paddy field to a certain level, to suppress the inflow of rainwater into the river, and to avoid flood damage during heavy rain. Replacing a new water level adjusting plate is not only complicated but also dangerous. In addition, if the selection of the height of the water level adjustment plate is wrong, there is a disadvantage that the rice field rice may be flooded or the shore may be destroyed.

  (2) If the water level adjustment plate is not replaced after the rain stops, the paddy water will not return to the original farming water level. Therefore, it adversely affects the growth of rice. Another problem is that once the rain stops, it loses its water storage capacity when it rains again.

  (3) In the conventional technique improved to solve such a problem, there is a problem that the apparatus is complicated and is made of metal, so that it becomes expensive. In addition, the prevention of flood damage using the function of “paddy dam” cannot be expected even if implemented in a few paddy fields, and it is necessary to install it in many paddy fields to make “paddy dam” a large area. For this reason, there is a problem that it is difficult to install an expensive apparatus in many paddy fields.

  In view of the above problems, the present invention retains the set amount of water in a paddy field during light rain, and automatically stores a certain amount of water by using the “paddy dam” function in a paddy field, and the rainwater flows into the river. The present invention relates to a water storage amount adjusting device for paddy fields.

Among the means for solving the above-mentioned problems, the main configuration (claim 1) in the water storage volume adjusting device for paddy fields of the present invention is
The front side to be arranged on the paddy field side is opened, and a vertical wall having drain holes at the lower end is arranged on the back side of the rectangular bottom plate, and a pair of side walls are arranged on both sides of the bottom plate to form a U shape. A water storage amount adjusting device for paddy fields, wherein one end of a drain pipe is attached to the drain hole of a paddy drainage basin installed near the shore of the paddy field, and the other end of the drain pipe is connected to a drainage channel,
At the opposite position of the pair of side walls, a retaining plate insertion door is provided, and a water storage amount adjustment plate insertion door is provided at a substantially intermediate position between the retaining plate insertion door and the vertical wall. Insert the retaining plate of the same height as the vertical, and insert the farming water level adjusting plate of the height that will be the farming water level when it is placed on the retaining plate, The height is configured to be almost the same as the stored water level, which is an arbitrary height that matches the growing state of rice, and a storage amount adjustment plate with a drainage adjustment hole formed in the lower part is inserted vertically,
In the case of normal rainfall, rainwater that enters the space between the farm water level adjustment plate and the storage amount adjustment plate drains from the drainage amount adjustment hole of the storage amount adjustment plate through the drain pipe attached to the drain hole. Drain to the road to maintain the farming water level of the paddy field. In case of heavy rain, the rainwater that enters the space beyond the farming water level adjustment plate exceeds the discharge from the drainage adjustment hole, and the water level in the space gradually rises. Over time, the rainwater overflows beyond the reservoir water level set at the upper end height of the reservoir adjustment plate, and the rainwater is stored up to the maximum reservoir water level that is the sum of the reservoir adjustment height and the overflow height, It is characterized by preventing flooding of paddy rice and damage to the shore.

The invention of claim 2 of the present invention is the water storage volume adjustment device for paddy according to claim 1,
The height of the water storage amount adjusting plate is characterized by being formed to a height that does not adversely affect the growth of rice.

The invention of claim 3 of the present invention is the water storage volume adjusting device for paddy field according to claim 1,
In the case of normal rainfall, the drainage amount adjustment hole of the water storage amount adjustment plate is characterized by having a size adjusted to a drainage amount that does not exceed the set water level.

Since the present invention has the above-described configuration, the following effects are obtained.
(1) Prevention of flood damage using the function of “paddy dam” cannot be expected even if it is implemented in a few paddy fields, and it is necessary to implement it in many paddy fields to make “paddy dam” a large area. When an expensive device is installed to form a “rice field dam”, the cost becomes enormous and difficult to implement. However, the present invention is a paddy field storage volume adjustment device with a simple structure, so the equipment cost is low. It can be installed in a wide range of paddy fields and can function as a “rice field dam” to prevent flooding.

 (2) According to the present invention, the rainwater can be stored in the paddy field by using the function of “rice field dam” during heavy rain, and the amount of drainage can be suppressed. As a result, rainwater is not discharged into the river at a stretch in a short time, so that it is possible to prevent flood damage. In addition, even if it continues to rain, the maximum reservoir water level will not be exceeded, so it is possible to prevent bank breakage and rice flooding.

(3) When storing water in paddy fields, not only storing water in paddy fields, but also draining the amount of water that does not cause flooding, so that it is possible to earn a long time to reach the stored water level. ing. In addition, when rain stops temporarily or light rain, the water level is lowered by this drainage, the water storage function can be automatically recovered, and water can be stored even when heavy rain hits again.

(4) In the case of normal rainfall, the farming water level is maintained because the water is drained from the drainage adjustment hole. In addition, rainwater stored during heavy rains automatically returns to the farming water level after the rain stops, so it does not adversely affect rice growth.

(5) Since the water storage amount adjustment work can be automatically performed according to the rainfall, it is possible to avoid the water storage amount adjustment operation which is dangerous during heavy rain.

The Example figure in the case of the normal rainfall of this invention. The Example figure in the case of heavy rain of this invention. The Example figure when the rain of this invention stops. The perspective view of the drainage basin for paddy fields of this invention. The Example figure of the drainage basin for paddy until now.

The present invention will be described with reference to FIGS.
1 to 4, a water storage volume adjusting device 1 for paddy fields according to the present invention is a vertical wall in which a front side disposed on the paddy field 16 side is opened and a drain hole 4 is provided at the lower end on the back side of the rectangular bottom plate 6. 3, a pair of side walls 5 are arranged on both sides of the bottom slab 6, and are formed in a U shape. The paddy drainage basin 2 is installed near the shore 20 of the paddy field 16, and the paddy drainage basin 2 One end of a drain pipe 14 is attached to the drain hole 4, and the other end of the drain pipe 14 is connected to a drain path 15.

  Further, a retaining plate insertion door 7 is provided at a position opposite to the pair of side walls 5 of the paddy drain 2, and a storage amount adjusting plate insertion door 8 is provided at a substantially intermediate position between the retaining plate insertion door 7 and the vertical wall 3. Is provided.

  The earth retaining plate 10 having the same height as the soil surface 17 is vertically inserted into the earth retaining plate insertion door 7 to prevent the soil 17 of the paddy field 16 from entering the paddy drain 2.

  Further, when placed on the retaining plate 10, a farming water level adjusting plate 11 having a height that becomes the farming water level S is inserted vertically, and the upper end height is set to the water storage amount adjusting plate insertion door 8 in the state of growing rice. The water storage amount adjustment plate 13 that is formed to be approximately the same height as the storage water level S1 that is approximately 10 cm higher than the farming water level S and that has a drainage adjustment hole 12 in the lower part is inserted vertically. It is configured.

  The height of the water storage amount adjusting plate 13 is formed to be a height obtained by subtracting the overflow height h2 assumed in the case of heavy rain that causes flood damage from the maximum water storage height S2 at which the rice plant 18 is not flooded. However, it does not cause breach of the shore or flood, so that it does not adversely affect the growth of rice.

  In addition, the drainage adjustment hole 12 of the water storage adjustment plate 13 is sized so that rainwater can be discharged without hindrance in the case of normal rainfall, and it has a bad influence on the growth of rice without causing breakage of the shore or flooding. It is formed not to give.

  In the case of the normal rainfall shown in FIG. 1, water 21 is stored in the paddy field 16 up to the height of the farming water level adjusting plate 11 (hereinafter referred to as farming water level). Then, rainwater that has entered the space 9 between the water level adjustment plate 11 and the water storage amount adjustment plate 13 is attached to the drainage hole 4 from the drainage amount adjustment hole 12 drilled in the lower part of the water storage amount adjustment plate 13. The farming water level S of the paddy field 16 is maintained by draining to the drainage channel 15 through the drainage pipe 14.

  On the other hand, in the case of heavy rain shown in FIG. 2, the amount of water 21 flowing into the space 9 beyond the farm water level adjusting plate 11 increases. When the amount of water flowing into the space portion 9 becomes larger than the amount of drainage from the drainage amount adjustment hole 12 provided in the stored water amount adjustment plate 13, the water level of the rice field is determined based on the amount of inflow into the space portion 9 per unit time and the amount of drainage adjustment hole 12. It rises by the difference in the amount of drainage from

  Even in the case of heavy rain, until the stored water level S1 is exceeded, the amount of water flowing into the drainage channel 15 is only discharged from the drainage adjustment hole 12, so that it remains constant regardless of the amount of rainfall. Prevents rainwater from flowing in a short time.

  Moreover, since the amount of water adjusted to such an extent that does not cause water damage is drained rather than simply storing the rain that has fallen, the time required to reach the maximum stored water level S2 can be increased.

  Furthermore, when it continues to rain, the rainwater does not exceed the maximum water storage level S2 because a large amount of water is drained from the drain pipe 14 through the water storage amount adjusting plate 13 as the water level rises. For this reason, it is possible to prevent the rice 18 from being flooded or the shore 20 from being destroyed.

That is, in the case of normal rainfall, rainwater that has entered the space 9 between the farm water level adjustment plate 11 and the storage amount adjustment plate 13 is attached to the drainage hole 4 from the drainage amount adjustment hole 12 of the storage amount adjustment plate 13. The drainage pipe 14 is drained to the drainage channel 15 to maintain the farming water level S of the paddy field 16.
Next, in the case of heavy rain, the rainwater that has entered the space 9 beyond the farm water level adjustment plate 11 will exceed the amount discharged from the drainage adjustment hole 12, and the water level in the space 9 will gradually rise, eventually. Rainwater will overflow beyond the stored water level S1 set at the upper end height of the storage volume adjustment plate 13, and the maximum stored water level S2 is the height obtained by adding the overflow height h2 to the stored water volume adjustment height h1. Can store rainwater up to. This overflow height h2 starts when it exceeds the discharge amount from the drainage adjustment hole 12, and fluctuates depending on the rainfall. In this way, the amount of water discharged to the drainage channel 15 is suppressed to a constant amount of water discharged from the drainage adjustment hole 12 regardless of the amount of rainfall until reaching the stored water level S1, so even in the case of heavy rain It is adjusted to prevent the rain that has just flown into the drainage channel 15 in a short period of time, so that it can function as a “rice field dam”. Since it overflows and is discharged | emitted, the raise of this highest stored water level S2 is suppressed and hold | maintained. As a result, it is possible to prevent the paddy rice from being flooded or damaging the shore.

  As shown in FIG. 3, when the rain stops, the water is drained from the drainage hole 4, and when the water level drops to the stored water level S1, it is drained from the drainage adjustment hole 12, and automatically returns to the farming water level S to recover the water storage capacity. To do. For this reason, it does not have a bad influence on the growth of rice 18, and can store water even when heavy rain hits again.

  In the above-mentioned case, the height of rice 18 around the end of June is about 40-50 cm, the height of the shore is about 30-40 cm, and the height of water storage is about 25 cm at the maximum considering the height of the shore 20 Usually, the height of water filling the paddy field 16 is about 7 to 10 cm.

DESCRIPTION OF SYMBOLS 1 Paddy field water storage amount adjustment device 2 Paddy field drainage basin 3 Vertical wall 4 Drainage hole 5 Side wall 6 Bottom plate 7 Dirt plate insertion door 8 Water level adjustment plate installation groove 9 Space part 10 Distillation plate 11 Farm water level adjustment plate 12 Drainage amount adjustment hole 13 Water storage Quantity adjustment plate 14 Drain pipe 15 Drainage channel 16 Paddy field 17 Soil 18 Rice 19 Rain 20 Shore 21 Water 22 Water level adjustment plate S Farming water level S1 Reservoir water level S2 Maximum water storage level h1 Reservoir volume adjustment height h2 Overflow height

Claims (3)

The front side to be arranged on the paddy field side is opened, and a vertical wall having drain holes at the lower end is arranged on the back side of the rectangular bottom plate, and a pair of side walls are arranged on both sides of the bottom plate to form a U shape. A water storage amount adjusting device for paddy fields, wherein one end of a drain pipe is attached to the drain hole of a paddy drainage basin installed near the shore of the paddy field, and the other end of the drain pipe is connected to a drainage channel,
At the opposite position of the pair of side walls, a retaining plate insertion door is provided, and a water storage amount adjustment plate insertion door is provided at a substantially intermediate position between the retaining plate insertion door and the vertical wall. Insert the retaining plate of the same height as the vertical, and insert the farming water level adjusting plate of the height that will be the farming water level when it is placed on the retaining plate, The height is configured to be almost the same as the stored water level, which is an arbitrary height that matches the growing state of rice, and a storage amount adjustment plate with a drainage adjustment hole formed in the lower part is inserted vertically,
In the case of normal rainfall, rainwater that enters the space between the farm water level adjustment plate and the storage amount adjustment plate drains from the drainage amount adjustment hole of the storage amount adjustment plate through the drain pipe attached to the drain hole. Drain to the road to maintain the farming water level of the paddy field. In case of heavy rain, the rainwater that enters the space beyond the farming water level adjustment plate exceeds the discharge from the drainage adjustment hole, and the water level in the space gradually rises. Over time, the rainwater overflows beyond the reservoir water level set at the upper end height of the reservoir adjustment plate, and the rainwater is stored up to the maximum reservoir water level that is the sum of the reservoir adjustment height and the overflow height, A paddy field water storage volume adjustment device characterized by preventing flooding of paddy rice and damage to the shore.   The water storage amount adjusting device for paddy fields according to claim 1, wherein the height of the water storage amount adjusting plate is formed to a height that does not adversely affect the growth of rice. The water amount adjusting device for paddy fields according to claim 1, wherein the water amount adjusting hole of the water amount adjusting plate is formed to have a size adjusted to a water amount not exceeding the farming water level in the case of normal rainfall. .

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