JPH0358246B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an irrigation water intake method for extracting agricultural water (irrigation water) from a water source such as a reservoir or a river. Use a water intake management system that allows irrigation water to be taken from two or more water sources: a non-powered water intake source that allows water to be taken in without power using a device, etc., and a powered water intake water source that allows water to be taken in using a powered pump. This relates to the method of taking in irrigation water.

(Prior technology) Irrigation method in which rice fields in the same area are irrigated from multiple water sources (so-called integrated water use)
Conventionally, for example, as shown in FIG. 4, a non-powered water intake water source 101 (for example, a reservoir) and a powered pump ( When the water level in the non-powered water intake source 101 is high (for example, the water level indicated by symbol B), the non-powered water intake source 101 The water from the non-powered intake water source 102 is taken in without power through the siphon-type water intake device 110, and when the water level in the non-powered intake water source 101 becomes low (for example, the water level indicated by symbol C), the water from the non-powered intake water source 102 is taken in by a powered pump. 104, the water in the non-powered water intake water source 101 is pumped into the non-powered water intake water source 101 using the water intake pipe 111 of the siphon-type water intake device or through the water supply pipe 112 of a separate system.
10 was used to supply water to each rice field.

However, when the water level in the non-powered water intake source 101 decreases as described above, the water from the powered water intake source 102 is pumped to the non-powered water intake source 101 by the power pump 104.
In the irrigation method in which water is supplied to each paddy field using the siphon-type water intake device 110 while pumping water into the rice field, a large-capacity pump is required to pump water from the powered intake water source 102 to the non-powered intake water source 101. There was a problem that equipment costs and running costs became high.

In addition, in FIG. 4, a series of water intake pipes 111
A valve 113 is provided in the middle of the water intake pipe 111, and when the water level on the non-powered water intake water source 101 side is relatively low, the valve 113 is closed and the upstream side 111a of the valve installation position in the water intake pipe 111 is connected to the non-powered water intake water source 101 side. Water is supplied from the power pump 104 to the downstream side 111b of the valve installation position from the power water intake water source 102 side, thereby reducing the amount of water taken from the non-power water intake water source 101 side. However, if this is done, the amount of natural water increase may be greater than the amount of water taken per unit time at the non-powered intake water source 101, and surplus water may be created in the non-powered intake water source 101. Even if surplus water is generated in the non-powered water intake water source 101, unless the valve 113 is manually released, the surplus water on the non-powered water intake water source 101 side cannot be supplied to the downstream side from the valve installation position, and the surplus water cannot be supplied to the downstream side from the valve installation position. cannot be used effectively. In this way, while the valve 113 is in the closed state, water must be supplied to the rice fields downstream from the valve installation position from the powered intake water source 102 by the powered pump 104, and surplus water that can be supplied without power is removed. Despite this, water must be supplied by power, which is uneconomical.

(Object of the Invention) In view of the above-mentioned problems of conventional irrigation, the present invention provides an irrigation system that allows water to be taken from both a non-powered water intake source and a powered water intake source, and the present invention provides an irrigation method that allows water to be taken from both a non-powered water intake source and a powered water intake source. Irrigation water is designed to minimize power consumption by drawing water, and to automatically replenish makeup water from the powered water intake source when water intake from the non-powered water intake source is insufficient. The purpose is to provide a water intake method.

(Means for Achieving the Object) The present invention takes water from a non-power intake water source that can be taken without power using a siphon-type water intake device or the like, and water from a power intake water source that can be taken by a power pump. Lead it into the head tank through the pipe,
The water in the head tank is supplied to the rice fields through the water supply pipe, and the water level in the head tank is increased from a predetermined set water level to the water intake port of the water intake pipe on the side of the non-powered water intake water source. An automatic opening/closing valve is provided which closes the water intake port when the water level decreases and opens the water intake port when the water level decreases. Detects this and turns on the power to the power pump.
A high water level detection device that turns off the water level and a low water level detection device that detects when the water level reaches a predetermined height lower than the set water level and turns on the power to the power pump from OFF to ON are provided, respectively. A water intake management system is used in which the high water level detection device and the low water level detection device are selected and controlled by a switching device, and when the water level in the non-powered water intake water source is higher than a predetermined water level, the switching device is The switching device is set to the low water level detection device side, and when the water level in the non-powered water intake water source is lower than the predetermined water level, the switching device is set to the high water level detection device side to manage water intake.

(Function) According to the irrigation water intake method of the present invention, by using the above-mentioned water intake management system, the automatic opening/closing valve, depending on the height of the water level in the head tank,
The high water level detection device or the low water level detection device automatically operates to automatically control the water supply from the non-powered intake water source side and the water supply from the powered intake water source side, and furthermore, the water level within the non-powered intake water source. When the water level is higher than the predetermined water level, by setting the switching device to the low water level detection device, when the water level in the head tank decreases, the automatic opening/closing valve opens before the low water level detection device detects the predetermined low water level, resulting in no power. Water supply from the intake water source to the head tank is started, and water from the non-powered intake water source is supplied preferentially, and if the water level in the non-powered intake water source is lower than the predetermined water level, the switching device is switched to the high water level detection device side. By setting it to , the power pump operates and water from the power intake water source is supplied to the head tank until the water level in the head tank reaches a predetermined height higher than the water level at which the automatic on-off valve is opened. Water is not taken from the non-powered water intake water source, and with the switching device set to the high water level detection device side, the amount of water supplied to the head tank by the power pump is less than the amount of water used, so water is only supplied by the power pump. In this case, when the water level in the head tank gradually decreases, when the water level in the head tank falls to the operating height of the automatic on-off valve, the automatic on-off valve opens and the amount of water equals the difference between the amount of water supplied by the power pump and the amount of water used. Water will be automatically supplied into the head tank from the non-powered intake water source. When the water supply to the non-powered water intake source is stopped or reduced in this way, the water level in the non-powered water intake source gradually increases due to natural water increase, and when the water level reaches a predetermined level, the switching device is switched off. What is necessary is to switch to the low water level detection device side and preferentially use the water from the non-powered water intake water source side again.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIGS. 1 to 3 show the first to third embodiments of the present invention, respectively.

The irrigation water intake method of the first embodiment is carried out using the water intake management system shown in FIG.
First, to explain the water intake management system shown in FIG. The water from the power intake water source 2 is led into the head tank 3 through the water intake pipes 11 and 21, respectively, and the water stored in the head tank 3 is passed through the water supply pipe 41 using the water head to the respective end hydrants 42 and 42. It is constructed so that water can be supplied to each rice field from...

The non-powered water intake source 1 is located at a considerably higher location than the installation position of the head tank 3. As the non-powered water intake source 1, a water source such as a reservoir that can store a relatively large amount of water is adopted. Incidentally, rainwater or groundwater flows into the non-powered water intake source 1 from the highlands, and the water naturally increases.

The siphon-type water intake device 10 is installed so that the siphon pipe detours above the water surface in the non-powered water intake water source 1. In this embodiment, irrigation water can be supplied to the rice fields in the flat area and the rice fields in the higher altitude area, but the head tank 3 is installed in the flat area so that it cannot take up too much water head. Since this is not possible, water is directly supplied from the water intake pipe 11 on the side of the non-powered water intake water source 1 to the terminal water tap 42A for supplying water to the rice fields in the highland area. In addition, even if these terminal water supply valves 42A, 42A, etc. for highland water supply are opened as many times as the designed number of simultaneous openings (or maximum water intake amount per hour),
A sufficient water head difference is ensured for supplying water from the non-powered water intake water source 1 side to the head tank 3 side.

The tip (water outlet) 12 of the water intake pipe 11 on the side of the non-powered water intake water source 1 is opened near the bottom of the head tank 3 . The water outlet 12 is configured to close the water outlet 12 when the water level in the head tank 3 increases beyond a predetermined set water level M, and to open the water outlet 12 when the water level decreases. An automatically operated on-off valve 13 is provided.
In this embodiment, a float valve is employed as the automatic opening/closing valve 13, but in other embodiments, the automatic opening/closing valve 13 is operated by a signal from a water level detection device that detects a predetermined set water level M in the head tank 3. It is also possible to employ a solenoid valve or the like.

As the power water intake water source 2 taken in by the power pump 4, for example, a well dam that dams a river is employed. When the power pump 4 operates, the water in the power intake water source 2 is continuously supplied into the head tank 3. In addition, this power pump 4 is
As will be described later, the total water intake amount per hour of the water intake amount by the power pump 4 and the water intake amount from the non-powered water intake water source 1 side (total water supply amount in the head tank 3) is:
It is preferable to have a pump capacity that is greater than the maximum amount of water taken per hour from each end hydrant 42, 42....

In the head tank 3, when the water level in the head tank 3 reaches a water level H that is a predetermined height higher than the predetermined set water level M at which the automatic opening/closing valve 13 operates, the height of the water level is detected. A high water level detection device 31 operates the power supply to the power pump 4 from ON to OFF, and detects when the water level L reaches a predetermined height lower than a predetermined set water level M at which the automatic opening/closing valve 13 operates. A low water level detection device 32 is provided for turning on the power to the power pump 4 from OFF to ON. In addition, the low water level detection device 32
The water level detected by the head tank 3 (low water level L) is
Even when all the end water taps 42, 42... that are supplied with water from the
The height is such that the dynamic water head T for supplying water to 2... is secured.

The above high water level detection device 31 and low water level detection device 32
In this first embodiment, the manual switching device 33
It can be selected and controlled by That is, when the switching device 33 is manually set to the high water level detecting device 31 side, only the signal from the high water level detecting device 31 is transmitted to the power pump 4, and conversely, the switching device 33 is set to the low water level detecting device 32 side. When set to the side, only the signal from the low water level detection device 32 side is transmitted to the power pump 4.

This water intake management system is configured as described above. Next, we will explain how to take irrigation water using this water intake management system. If the water level is higher than 1/2 water level), the switching device 3
3 is manually set to the low water level detection device 32 side, and conversely, when the water level in the non-powered intake water source 1 is lower than the predetermined water level A, the switching device 33 is set to the high water level detection device 31 side. Let's do it. Before supplying water to the fields, water from the non-powered water intake water source 1 is placed in the head tank 3 in advance at a set water level M at which the automatic on-off valve 13 closes without power using the siphon-type water intake device 10.
Install it until.

When the switching device 33 is set to the low water level detection device 32 side (when the water level in the non-powered intake water source 1 is higher than the predetermined water level A), the power pump 4 is activated by the signal from the low water level detection device 32. For example, when the water level in the head tank 3 is higher than the low water level L at which the stopped water level detection device 32 operates, the power pump 4 is stopped. Also, when each terminal water tap 42, 42... is opened, the water in the head tank 3 is supplied to each field through the water supply pipe 41, and when the water level in the head tank 3 decreases and falls below the set water level M. The automatic opening/closing valve 13 is opened, and water from the non-powered water intake water source 1 is supplied into the head tank 3 without power.
At that time, if the amount of water taken per hour from each terminal water tap 42, 42... is less than the amount of water supplied into the head tank 3 from the non-powered water intake water source 1 side, the water level in the head tank 3 will rise and the above will occur. Automatic opening/closing valve 13 when the water level reaches the set water level M
is closed, and the water supply from the non-powered water intake water source 1 side to the head tank 3 is interrupted.
is opened and closed, and the water level in the head tank 3 is maintained near the height of symbol M by only supplying water from the non-powered water intake water source 1 side. On the other hand, if the amount of water taken from each end hydrant 42, 42... is larger than the amount of water supplied into the head tank 3 from the non-powered water intake water source 1 side, the water level in the head tank 3 will gradually decrease. Low water level L at which the low water level detection device 32 operates
When the water level reaches the water level, the power pump 4 is activated by a signal from the low water level detection device 32, and the power pump 4 starts to supply water from the power intake water source 2 side to the head tank 3 through the water intake pipe 21.
The amount of water that is the difference between the amount of water taken from each terminal water tap 42, 42, . In addition, the pumping capacity of the power pump 4 is calculated from the difference between the maximum amount of water taken per hour from each terminal water tap 42, 42... and the amount of water supplied per hour into the head tank 3 from the non-powered water intake water source 1 side. If you make it larger, each end hydrant 42, 42...
Even when taking water at the maximum water intake per hour from ..., the water level in the head tank 3 is marked L (low water level).
It will now be maintained nearby. In this case, the power pump 4 operates when the water level in the head tank 3 is low.
It will start and stop intermittently in the vicinity.

In this way, the switching device 33 is connected to the low water level detection device 3.
If it is set to the 2 side, the automatic on-off valve 13 opens earlier than the power pump 4 starts operating, and water from the non-power intake water source 1 side can be used preferentially, and the water for driving the power pump 4 can be used preferentially. Power consumption can be minimized. In addition, when the water from the non-powered water intake water source 1 is taken preferentially as described above, the water storage amount (water level) in the non-powered water intake water source 1 decreases, but the water level in the non-powered water intake water source 1 decreases. If the water level drops to an extreme level (for example, to the level D), it is necessary to limit the amount of water taken per hour, and when it is necessary to supply a large amount of water in a short period of time (for example, water supply during rice planting).
become unable to respond to Therefore, non-powered intake water source 1
When the water level on the side drops to a predetermined water level A (for example, 1/2 the water level when the water is full), the switching device 33 is switched to the high water level detection device 31 side to manage water intake.

When the switching device 33 is set to the high water level detection device 31 side, the power pump 4 operates continuously until the water level in the head tank 3 reaches the high water level indicated by the symbol H, giving priority to water from the power intake water source 2 side. By taking water in a fixed manner, the amount of water taken from the non-powered water intake water source 1 side can be reduced. That is, non-powered intake water source 1
The water supply from the side is stopped when the water level in the head tank 3 reaches the set water level M, but the water supply from the powered water intake water source 2 side is maintained at the water level in the head tank 3 even after the water supply from the non-powered water intake water source 1 side is stopped. This is done continuously until the high water level H is reached, and water from the power water intake water source 2 side is used preferentially. In addition, if the total amount of water taken per hour from each terminal water tap 42, 42... is less than the amount of water supplied per hour from the power water intake water source 2 side by the power pump 4, the water level in the head tank 3 will rise. When the water level in the head tank 3 reaches the high water level H, the high water level detection device 31 is operated and the power pump 4 is stopped by the signal. The pump 4 repeatedly starts and stops to maintain the high water level H in the head tank 3. In addition, each end hydrant 42, 42...
If the total amount of water taken per hour is greater than the amount of water supplied per hour by the power pump 4, the water level in the head tank 3 will drop, but when the water level drops to the height of symbol M, the automatic on-off valve 13 will open. Then, water supply from the non-powered water intake water source 1 side is started,
The water level in the head tank 3 will rise.

In this way, if the switching device 33 is set to the high water level detection device 31 side when the water level on the non-powered water intake water source 1 side is lower than the predetermined water level A, the automatic opening/closing valve 13
The power pump 4 starts operating earlier than the opening of the power supply, and water intake from the power water intake water source 2 side takes priority.
It is possible to prevent the water level in the non-powered water intake water source 1 from dropping excessively. In addition, if the water level in the non-powered water intake water source 1 is prevented from dropping excessively in this way and the water level is always maintained at a certain level or higher in the non-powered water intake water source 1, each end hydrant 42 ，
When it is necessary to supply a large amount of water at once from . In addition, if the water intake from the non-powered water intake water source 1 side is reduced in this way, the water level will rise as water flows into the non-powered water intake water source 1 from outside such as a river or groundwater. Then, when the water level in the non-powered water intake water source 1 returns to the predetermined water level A or higher, the switching device 33 is set to the low water level detection device 32 side again to give priority to water intake from the non-powered water intake water source 1 side. Make it.

In the second embodiment shown in FIG. 2, two head tanks 3, 3 are installed at appropriate intervals, and each branch water intake pipe 11A branches water from the non-powered water intake water source 1 side from one water intake pipe 11. , 11B into the head tanks 3, 3, respectively, and
Water from the power intake water source 2 is pumped by power pumps 4 and 4, respectively.
4, the water is led through each water intake pipe 21, 21 into each head tank 3, 3. or,
Each branch water intake pipe 11A on the non-powered water intake water source 1 side,
The water intake ports 12, 12 of 11B are provided with automatic opening/closing valves (float valves) 13, 13, respectively, as in the case of the first embodiment (Fig. 1), and furthermore, each head tank 3, 3 is provided with a manual type valve, respectively. Switching device 33, 3
A high water level detection device 31 and a low water level detection device 32 are provided, which are selectively switched and controlled by 3.

In the case of this second embodiment, as in the case of FIG. , 32 side, and conversely, the water level in the non-powered intake water source 1 is set to the predetermined water level A.
If the water level is lower, each switching device 33 is switched to high water level detection 3.
Set it to the 1, 31 side to manage water intake. still,
This second embodiment also operates in the same manner as the case of FIG. 1, so its explanation will be omitted.

In the third embodiment shown in FIG. 3, the switching device 33 is automatically switched by a signal from a water level detection device 51 that detects the water level in the non-powered intake water source 1. That is, the water level detection device 51 detects whether the water level in the non-powered water intake water source 1 has reached the predetermined water level A, and if the water level in the non-powered water intake water source 1 is higher than the predetermined water level A, Based on the signal, the switching device 33 is set to the low water level detection device 32 side, and conversely, the water level in the non-powered water intake water source 1 is set to the predetermined water level A.
If the water level is lower than that, the switching device 33 is set to the high water level detection device 31 side based on the signal. If the switching of the switching device 33 is controlled by the signal from the water level detection device 51 in this way, water intake management can be automated.

(Effects of the Invention) According to the irrigation water intake method of the present invention, when the water intake management system described above is used and the water level in the non-powered water intake water source 1 is higher than the predetermined water level A, the switching device 33 is activated to detect a low water level. By setting it on the device 32 side, water from the non-powered water intake water source 1 side is preferentially supplied to the non-powered water source 1 side, and the power (electricity) consumption for supplying irrigation water can be significantly reduced. and when the water level in the non-powered water intake water source 1 is lower than the predetermined water level A, the switching device 33
By setting the water level on the high water level detection device 31 side, the water on the powered water intake water source 2 side is preferentially supplied, and the water level on the non-powered water intake water source 1 side can be prevented from dropping excessively. If the total amount of water supplied per hour to each rice field exceeds the amount of water taken from the powered water intake water source 2 side, the shortage can be replenished from the non-powered water intake water source 1 side, so a large amount of irrigation water can be supplied at once. This has the effect that even when water is required, it can be handled without interrupting the water supply or limiting the amount of water supplied.

[Brief explanation of drawings]

1 to 3 are diagrams of a water intake management system for carrying out the irrigation water intake method according to the first to third embodiments of the present invention, respectively, and FIG. 4 is a diagram of a conventional water intake management system. 1...Non-powered intake water source, 2...Power intake water source,
3...Head tank, 4...Power pump, 10...
...Saifon type water intake device, 11...Water intake pipe,
12...Water outlet, 13...Automatic opening/closing valve, 21...
...Water intake pipe, 31...High water level detection device, 32...
...Low water level detection device, 33...Switching device, 41...
water supply pipe.

Claims (1)

[Claims] 1. Water from a non-powered water intake water source 1 and a powered pump 4 that can take water without using power using a siphon-type water intake device or the like.
The water from the power water intake water source 2 is passed through the water intake pipes 11 and 21 to the head tank 3, respectively.
The water in the head tank 3 is supplied to the rice fields through the water supply pipe 41, and the water level in the head tank 3 is supplied to the water outlet 12 of the water intake pipe 11 on the side of the non-powered water intake water source 1 so that the water level in the head tank 3 reaches a predetermined level. When the water level increases beyond the set water level (M), the water outlet 12 is closed, and when the water level decreases, the water outlet 1 is closed.
An automatic opening/closing valve 13 is provided in the head tank 3 to detect when the water in the head tank 3 reaches a water level (H) higher than the set water level (M) by a predetermined height. Energizing the power pump 4
A high water level detection device 31 that operates from ON to OFF detects when the water level (L) reaches a predetermined height lower than the set water level (M) and operates the power pump 4 from OFF to ON. A water intake management system is used in which low water level detection devices 32 are provided, and the high water level detection device 31 and the low water level detection device 32 are selectively controlled by a switching device 33. When the water level in the non-powered intake water source 1 is higher than the predetermined water level (A), the switching device 33 is set to the low water level detection device 32 side, and when the water level in the non-powered water intake water source 1 is lower than the predetermined water level (A), the switching device 33 is set to the low water level detection device 32 side. An irrigation water intake method characterized in that the switching device 33 is set on the high water level detection device 31 side to manage water intake. 2. The irrigation water intake method according to claim 1, wherein switching of the switching device 33 is performed by manual operation. 3. The irrigation water intake method according to claim 1, characterized in that the switching device 33 is automatically switched by a signal from a water level detection device 51 installed in the non-powered water intake water source 1. .