JP3593889B2 - Water level adjustment device between two communicating reservoirs - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a water level adjusting device between two communicating reservoirs in a terraced reservoir.
[0002]
[Prior art]
As a water storage method in a location with a slope, there is a terraced-type reservoir in which several levels of dams are built and flooded.
[0003]
Conventionally, as shown in FIG. 2, this terraced-type reservoir is formed stepwise by partitioning into a high-water reservoir 3 and a low-water reservoir 4 by a weir 2 erected on an inclined surface 1. The water level in each reservoir is adjusted by an overflow type that regulates the amount of overflow from the upper part of the weir 2 or a tunnel type that regulates the amount of outflow from a tunnel passing through the weir 2. It depends on the method.
[0004]
[Problems to be solved by the invention]
However, with the conventional spillway system, it is not possible to finely adjust the water level of each reservoir by taking water from downstream, and it is necessary to drain water evenly from all the rice terraces or to store water evenly in all the rice terraces. There was a drawback that could not be done.
[0005]
Therefore, an object of the present invention is to solve the above-mentioned problems, to adjust the water level of each reservoir with respect to water intake from downstream, to drain water evenly from all the rice terraces, or to all the rice terraces. It is an object of the present invention to provide a water level adjusting device between two communicating reservoirs, which can store water in the reservoir.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the water level adjusting device between the two communicating reservoirs according to the present invention, the high water reservoir and the low water reservoir are connected to each other in the vicinity of the bottom by a communication pipe, and the low water level is reduced. In the side reservoir, a lower end is connected to the communication pipe, and an upper end is supported by the float, and a water level adjusting pipe is provided which can move up and down in response to the water level, and the upper end opening of the water level adjusting pipe is predetermined from the water surface. It is configured to protrude above the height and positioned.
[0007]
The water in the low-water reservoir is discharged or supplied to the high-water reservoir, so the relative height difference between the two reservoirs increases, and the water level in the low-water reservoir is adjusted. When the height of the upper opening of the pipe is lower than the water level of the high water reservoir, water flows from the high water reservoir to the low water reservoir through the communication pipe and the water level adjustment pipe. Then, when the water level of the high-water-side reservoir falls and the water level of the low-water-side reservoir rises, and the height of the upper-end opening of the water-level adjustment pipe and the water level of the high-water-side reservoir become equal, the flow of water at that point in time Stops. That is, the water level of the high water reservoir and the water surface of the low water reservoir are raised and lowered so as to always maintain a constant difference in relative height. Therefore, it is possible to uniformly drain water from the reservoirs of all the rice terraces, or to evenly store the water in the reservoirs of all the rice terraces.
[0008]
The opening of the pipe, which is made to protrude above the water surface by the float, may be provided at the tip of the pipe, or may be provided in the middle of the part of the pipe which is exposed on the water surface.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiments.
[0010]
The upper and lower reservoirs shown in FIG. 1 are formed by partitioning a high-water reservoir 3 and a low-water reservoir 4 by a weir 2 erected on an inclined surface 1.
[0011]
A communication pipe 5 is provided below the weir 2 partitioning the high water reservoir 3 and the low water reservoir 4 so as to penetrate the weir 2 and communicate near the bottoms of the two reservoirs 3, 4. In the low-water-side reservoir 4, a lower-end portion is connected to a communicating pipe 5 facing the lower-reservoir 4, and a water-level adjusting pipe 6 is provided. The water level adjusting pipe 6 is made of a flexible hose made of synthetic resin or the like, or a telescopic pipe whose upper end is vertically expandable and contractable. A float 7 is attached to the upper end. Then, the upper end opening 6a of the water level adjusting pipe 6 is always protruded upward by a predetermined height (constant difference) h from the water surface of the low water level reservoir 4. The lowermost end of the communication pipe 5 is closed or opened and closed by an on-off valve 8.
[0012]
In the water level adjusting device between the two reservoirs configured as described above, the height of the upper end opening 6a of the water level adjusting pipe 6 provided in the low water level reservoir 4 is higher than the water level of the high water level reservoir 3. When the water level is high, water does not flow through the communication pipe 5 and the water level adjustment pipe 6, but water is discharged from the low water level reservoir 4 or water is supplied to the high water level reservoir 3 and so on. When the relative difference between the water levels of the reservoirs 3 and 4 becomes large, and the height of the upper end opening 6a of the water level adjusting pipe 6 provided in the low water level reservoir 4 becomes lower than the water level of the high water level reservoir 3, the communication pipe is connected. Water flows from the high water reservoir 3 to the low water reservoir 4 through the water level adjustment pipe 5 and the water level adjusting pipe 6. Then, when the water level of the high-water-side reservoir 3 decreases and the water level of the low-water-side reservoir 4 rises, the height of the upper end opening 6a of the water-level adjusting pipe 6 becomes the same as the water level of the high-water-side reservoir 3. At that point, the water stops flowing and no longer flows. That is, both water levels rise and fall so that the water level of the high water reservoir 3 is always higher than the water level of the low water reservoir 4 by a constant height h.
[0013]
As described above, since the water level difference between the low water reservoir 4 and the high water reservoir 3 tends to become a predetermined constant value (constant difference h), the water levels of all the reservoirs are simultaneously adjusted by taking water from downstream. And automatically. The water level difference (constant difference h) itself can be set only by adjusting the rising height h of the pipe 6 in the float 7. By operating the open / close valve 8 provided in the communication pipe 5, the water levels of the two reservoirs 3 and 4 can be made uniform.
[0014]
The above-mentioned siphon type liquid level control device is installed in each of the reservoirs in each of the terraced rice fields. Therefore, when water is taken from the lowermost reservoir, the water levels of all the reservoirs change simultaneously. Also, when water is supplied to the reservoirs in the uppermost terraces, the water levels in all the reservoirs in the terraces rise simultaneously. Therefore, it is possible to uniformly drain water from the reservoirs of all the rice terraces, or to evenly store the water in the reservoirs of all the rice terraces.
[0015]
Further, since the water level adjusting device of the present invention has a simple configuration, water can be stored with light equipment even in a steep place. Further, the water level adjusting device of the present invention can be applied to a normal rice terrace-type reservoir, and can also be used when performing a satoyama production (environmental priority) imitating a Senmaida (Tanada) or using a rice terrace-type reservoir as a ground. It can be used in a medium tank type and deployed underground, or when a terraced reservoir is built underground in a disaster prevention function park in a city. Further, the water level adjusting device of the present invention has a characteristic that it operates so that the transpiration area of all the rice terraces is always maximized, and such a characteristic can be used for heat island measures.
[0016]
【The invention's effect】
As described above, according to the present invention, while providing a communication pipe that communicates near the bottom of the high-water reservoir and the low-water reservoir, the lower end is connected to the communication pipe in the low-water reservoir. A water level adjusting pipe is provided, and a flexible upper end is used for the water level adjusting pipe or a pipe whose upper end is vertically expandable and contractable, and a float is attached to the upper end of the water level adjusting pipe. The upper opening is always projected above the water surface by a predetermined height, so even if water is discharged from the low-water reservoir or supplied to the high-water reservoir, the high-water reservoir and the low Water flows from the high water reservoir to the low water reservoir through the communication pipe and the water level adjustment pipe so that the relative difference in water level with the water reservoir is at a predetermined height. Automatically calculates the relative difference in water level from the water level reservoir. It can be kept constant. Therefore, the water can be uniformly drained from the reservoirs of all the rice terraces, and the water can be evenly stored in the reservoirs of all the rice terraces.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a water level adjusting device between two communicating reservoirs according to the present invention.
FIG. 2 is a schematic diagram showing an overflow type water level adjusting device in a conventional rice terrace type reservoir.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Slope 2 Weir 3 High water reservoir 4 Low water reservoir 5 Communication pipe 6 Water level adjustment pipe 6a Upper end opening 7 Float

Claims (1)

The high water reservoir and the low water reservoir are connected to each other in the vicinity of the bottom by a communication pipe, and the lower end is connected to the communication pipe and the upper end is supported by the float in the low water reservoir. A water level adjusting pipe capable of ascending and descending in response to a water level is provided, and an upper end opening of the water level adjusting pipe is located so as to protrude above a water surface by a predetermined height, and is adjusted between two communicating reservoirs. apparatus.

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