JP2011205941A - Drainage measuring box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage measuring box enabling a user to confirm that water for use supplied to a paddy field overflows from the drainage measuring box from a distance in spite of having an inexpensive and simple structure.SOLUTION: The drainage measuring box 5 is configured to include: a drainage pipe 10 draining the water for use supplied to a paddy field 4 through a water intake opening 3 from the paddy field 4; an exchanging part 20 exchanging energy of fluid of the water for use overflowing into the drainage pipe 10 from the paddy field 4 into mechanical energy; and a notification part 30 driven by the mechanical energy exchanged in the exchanging part 20. The exchanging part 20 is provided with: an impeller 21 rotating due to the flow of the water for use overflowing into the drainage pipe 10; and a support part 23 pivotally supporting the main shaft 22 of the impeller 21. The notification part 30 is provided with: a transmission mechanism 31 into which the rotary energy of the main shaft 22 is input; and a display part 32 the state of which is displaced by the energy transmitted from the transmission mechanism 31.

Description

  The present invention relates to a drainage basin that drains water supplied to a paddy field from the paddy field and maintains the water level at a predetermined level.

  Generally, as a method of supplying water to the paddy field, a water channel that guides the water flowing through the river is installed outside the paddy field, and water is taken from this water channel through a sluice and a water intake, or a tubular water channel through which water pumped by the pump flows. There is a method of installing a water intake valve at a necessary position of the water channel and taking water through the water intake valve. Water above a certain level supplied to the paddy field overflows into the drainage basin and is discharged into the drainage channel.

  For example, as shown in FIG. 11, in the drainage basin described in Patent Document 1, an inlet 93 connected to the water supply / drainage pipe 99 from the upstream cultivation section 90 is provided at the bottom of the side wall of the bottomed cylindrical main body 92. In addition, an outlet 94 connected to the downstream water supply / drainage pipe 99 is provided oppositely, and a partition plate 95 that partitions the inside of the main body 92 into an inlet 93 side and an outlet 94 side is provided. The partition plate 95 includes a lower partition plate 96 that divides the lower half of the main body, and an upper partition plate 97 for adjusting the water level that moves up and down along the lower partition plate 96. The partition plate 95 is provided on the upper partition plate 97. The operation rod 98 is operated to adjust the water level of the paddy field.

JP-A-10-155374

  Despite supply of sufficient water in the paddy field, if water is supplied, fertilizers, chemicals, etc. will flow out together with the water that overflows into the drainage basin. It is necessary to close the sluice, intake, and intake valve.

  However, in the drainage basin described in Patent Document 1, it cannot be confirmed from the supply side of the irrigation water whether or not the irrigation water overflows from the drainage basin. The management was very troublesome.

  If water is pumped and secured in an environment where water resources are insufficient, it will be a waste of water resources to keep supplying water even if the water level exceeds the required level. Because of the cost of running, want to avoid excess drainage as much as possible.

  In particular, if the paddy field is constructed in a mountainous area or an inclined surface, it is difficult to look around whether sufficient water is supplied to the paddy field. However, it is uneconomical to introduce expensive equipment that automatically controls the water supply according to the water level of the paddy field.

  An object of the present invention is to provide a drainage basin that can confirm from a distance that the water supplied to the paddy field is overflowing the overflow weir while having an inexpensive and simple configuration.

  In order to achieve the above-mentioned object, the first characteristic configuration of the drainage basin according to the present invention is that the water supplied to the paddy field is drained from the paddy field as described in claim 1 of the claims. A drainage basin that maintains a water level, an overflow weir that the water overflows, a converter that converts the energy of the water that overflows into mechanical energy, and a mechanical that is converted by the converter It is in the point provided with the alerting | reporting part driven by energy.

  According to the above-described configuration, the conversion unit converts the energy of the water that overflows the overflow weir from the paddy field into mechanical energy, and the notification unit is driven by the mechanical energy. It is possible to confirm that the water supplied to the paddy field is overflowing from the overflow weir based on the notification state by the notification unit even when the drainage state of the water at the drainage basin far from the water is not visible it can. That is, since it can be confirmed that the water is sufficiently supplied to the paddy field while at the water inlet, the worker can immediately stop the supply of the water to the paddy field without reciprocating the water inlet and the drain. Moreover, since the notification unit does not require external power, it does not require running costs such as electricity bills.

  In addition to the above-mentioned first characteristic configuration, the second characteristic configuration is the impeller that is rotated by the flow of water that has overflowed the overflow weir, in addition to the first characteristic configuration described above, A support unit that pivotally supports the main shaft of the impeller, and the notification unit includes a transmission mechanism to which rotational power of the main shaft is input, and a display unit whose state is displaced by the power transmitted from the transmission mechanism. There is in point.

  According to the above-described configuration, the main shaft is supported by the support portion, and the impeller that rotates using the flow of the water that overflows the overflow weir causes the rotation of the main shaft to flow the water that has overflowed the overflow weir. Since the display unit displaces the state by the power converted into power and input to the transmission mechanism, and the power output from the transmission mechanism, no external power is required. Therefore, the notification unit can be configured easily, and the equipment cost can be kept low.

  In the third feature configuration, as described in claim 3, in addition to the second feature configuration described above, the transmission mechanism connects the main shaft and the support shaft of the display unit, and rotates the main shaft. Is converted to a reciprocating motion, and the display unit is reciprocated by the motion converting mechanism.

  According to the above configuration, the rotational motion of the main shaft is converted into the reciprocating motion of the display unit by the motion conversion mechanism. The operator can confirm that the water is sufficiently supplied to the paddy field by visually observing that the display unit reciprocates from a distance, and can stop the supply of the water to the paddy field.

  In the fourth feature configuration, as described in claim 4, in addition to the second or third feature configuration described above, sound is generated when ambient air flows into the display unit in accordance with the displacement of the state. The resonance point is provided.

  According to the above configuration, since the resonator generates sound using mechanical energy, even if it is difficult to confirm visually such as early morning, evening, or after sunset, The overflow can be confirmed without fail.

  In addition to any one of the second to fourth characteristic configurations described above, the fifth characteristic configuration includes a power generation unit that generates power by the rotational power of the main shaft, as described in claim 5, and the display unit In addition, a light emitting part or a sounding part driven by the electric power generated by the power generation part is provided.

  According to the above configuration, the power generation unit generates power using the rotational power of the main shaft, and the light emitting unit or the sound generation unit is driven by the power generated by the power generation unit, so no external power is required, early morning, evening, after sunset Even if it is, etc., overflow can be confirmed reliably by the light emission or sound generation state.

  In the sixth feature configuration, as described in claim 6, in addition to any of the second to fifth feature configurations described above, the overflow weir is configured by a drain pipe having an enlarged diameter portion, When the impeller is installed in the drain pipe via an elastic member that urges upward, and when a foreign matter is entangled with the impeller and the weight applied to the impeller increases, the urging force by the elastic member is resisted, It exists in the point comprised so that the said impeller may descend | fall to the expansion part of the said drain pipe.

  According to the above-described configuration, the conversion unit converts the energy of the water flowing from the paddy field to the drain pipe into mechanical energy, and the notification unit is driven by the mechanical energy. Even when the drainage state of the service water at the drainage basin far away cannot be directly observed, it can be confirmed whether the service water supplied to the paddy field overflows from the drainage pipe based on the notification state by the notification unit. That is, since it can be confirmed that the water is sufficiently supplied to the paddy field while at the water inlet, the worker can immediately stop the supply of the water to the paddy field without reciprocating the water inlet and the drain. Moreover, since the notification unit does not require external power, it does not require running costs such as electricity bills.

  Since the overflow weir is constituted by a drain pipe and an impeller is installed in the drain pipe, the overflowing water comes into contact with the impeller while flowing through the drain pipe. Therefore, the energy of water can be efficiently converted into mechanical energy.

  Furthermore, even if foreign matters such as foreign matters flowing out with the overflowing water get entangled with the impeller and the rotation of the impeller is obstructed or the drain pipe is clogged, the impeller is caused by the entanglement of the foreign matter. When the weight is increased, the elastic member is elastically deformed, the impeller is lowered to the enlarged diameter portion, the foreign matter is detached from the impeller, and then automatically returns to a normal state, so that maintenance work can be saved.

  In the seventh feature configuration, in addition to the sixth feature configuration described above, the drain pipe is moved up and down relative to the drain pipe in addition to the sixth feature configuration described above. A movable pipe capable of adjusting the level of the water that flows over the pipe, and the support portion is fixedly installed at a position that does not interfere with the vertical movement of the movable pipe.

  According to the above-described configuration, the movable pipe can be moved up and down with respect to the drain pipe without the support portion interfering when adjusting the water level of the overflowing water.

  As described above, according to the present invention, it is possible to provide a drainage basin capable of confirming from a distance that the water supplied to the paddy field is overflowing the overflow weir while having an inexpensive and simple configuration. I can do it now.

Schematic of the paddy field where the drainage basin of the present invention is installed Illustration of drainage Schematic of drainage dredge when set water level of paddy field is minimum water level Illustration of the display Illustration of a drainage basin equipped with a power generation unit It is explanatory drawing of the drainage basin provided with the enlarged diameter part in the drain pipe, (a) is explanatory drawing of the drainage basin at normal time, (b) is explanatory drawing when an impeller descends It is explanatory drawing of the drainage basin by another embodiment, Comprising: (a) is the schematic of a motion conversion mechanism and a display part, (b) is an AA arrow directional view. (A) is an explanatory diagram of movement of the motion conversion mechanism and the display unit, (b) is an explanatory diagram of movement of the motion conversion mechanism and the display unit, (c) is an explanatory diagram of movements of the motion conversion mechanism and the display unit, and (d) ) Is an explanatory diagram of the movement conversion mechanism and the movement of the display (A) is explanatory drawing of the drainage basin by another embodiment, (b) is explanatory drawing of the drainage basin by another embodiment. It is explanatory drawing of the drainage basin by another embodiment, Comprising: (a) is explanatory drawing of the drainage basin when the water does not overflow, (b) is explanatory drawing when the irrigation water overflows Illustration of conventional drainage

  Hereinafter, preferred embodiments of the drainage basin according to the present invention will be described.

  As shown in FIG. 1, the water flowing through the river 1 is guided to the irrigation channel 2 and supplied from the intake 3 to the paddy field 4 as irrigation water. A drainage basin 5 is installed on the opposite side of the water intake 3 of the paddy field 4, and the water overflowed to the drainage basin 5 is discharged into the drainage channel 6 and returned to the river 1. The water supply may be directly supplied from the river 1 to the paddy field 4 by a pump without providing the water intake 3. Moreover, the discharge destination of the water that overflowed to the drainage basin 5 can be arbitrarily set according to the paddy field, and may be directly returned to the river 1 without providing the drainage channel 6.

  The intake 3 is provided with a weir 7, and when the worker opens the weir 7, the water is supplied from the water channel 2 to the paddy field 4, and the supply to the paddy field 4 is stopped when it is closed.

  As shown in FIG. 2, the drainage basin 5 includes a drainage pipe 10 as an overflow dam through which the water supplied from the intake port 3 to the paddy field 4 overflows, and the water that overflows from the paddy field 4 to the drainage pipe 10. A conversion unit 20 that converts the energy of the fluid into mechanical energy and a notification unit 30 that is driven by the mechanical energy converted by the conversion unit 20 are provided.

  The drain pipe 10 is formed of, for example, a plastic pipe such as a polyvinyl chloride pipe, and includes a vertical pipe 11 having an inflow portion 11a for water, a horizontal pipe 13 having an outflow portion 13a to the drain passage 6, and a vertical pipe. 11 and the curved pipe 12 which connects the horizontal pipe 13, and the horizontal pipe 13 is penetratingly installed in the side surface at the side of the drainage channel 6 of the drainage pipe 5 formed with concrete. In addition, the drain pipe 10 is, for example, a vertical pipe 11 supported in the drain 5 by a support portion (not shown). A mesh member (not shown) may be provided in the inflow portion 11a so that impurities do not easily overflow into the drain pipe 10.

  The inflow portion 11a of the vertical pipe 11 is provided with a movable pipe 14 that can slide in a watertight state via a rubber seal packing or the like. By moving the movable tube 14 up and down with respect to the vertical tube 11, the water level overflowing the vertical tube 11 can be adjusted. By sliding the movable pipe 14 to an appropriate height, only the excess water that has flowed over the upper end of the movable pipe 14 is discharged from the drain pipe 10 to the drainage channel 6, and the water level on the paddy surface is kept constant. In the following description, the vertical pipe 11, the curved pipe 12, the horizontal pipe 13, and the movable pipe 14 are also simply referred to as the drain pipe 10 without being particularly distinguished.

  As shown in FIG. 3, the height of the inflow portion 11 a of the vertical pipe 11 is set to the same level as the paddy field, and the height of the upper end of the movable pipe 14 is set to the height of the inflow portion 11 a of the vertical pipe 11. When this happens, all the water in the paddy field 4 overflows into the drain pipe 10. In addition, when adjustment of a water level is not required, the structure which sets the height of the inflow part 11a of the drainage pipe 10 previously suitably without providing the movable pipe 14 may be sufficient. Further, in addition to the horizontal pipe 13, by providing a bypass pipe at the bottom of the drainage basin 5 for discharging the water in the drainage basin 5 to the drainage channel 6, when water supply to the paddy field 4 is not required, The inside of the drainage basin 5 can be left empty.

  The conversion unit 20 includes an impeller 21 that rotates due to the flow of water that has overflowed into the drain pipe 10, and a support unit 23 that supports the main shaft 22 of the impeller 21, and the notification unit 30 rotates the main shaft 22. A transmission mechanism 31 to which power is input and a display unit 32 whose state is displaced by the power transmitted from the transmission mechanism 31 are provided. In addition, the shape of an impeller can use an axial flow blade | wing, a diagonal flow blade | wing, a screw, etc.

  More specifically, the support portion 23 is formed of an appropriate material having corrosion resistance such as plastic, resin, stainless steel, etc., the base end portion is installed in the drainage basin 5, and the other end portion is arranged vertically above the drainage pipe 10. Has been. A bearing 24 of the main shaft 22 is fixedly installed at the other end of the support portion 23, and the bearing 24 is configured to be rotatably supported so that the main shaft 22 does not shift in the vertical direction. The support portion 23 is fixedly installed at a position that does not interfere with the vertical movement of the movable tube 14.

  An impeller 21 is disposed on the main shaft 22 at an appropriate height in the vertical pipe 11 so as to be rotated by the overflowing water.

  The upper end of the main shaft 22 is provided with a coupling that connects the main shaft 22 and the support shaft 33 of the display unit 32. The coupling connects the main shaft 22 and the support shaft 33 of the display unit 32, and as the main shaft 22 rotates. A transmission mechanism 31 for rotating the support shaft 33 is configured.

  The display unit 32 is composed of a columnar member having a support shaft 33 at the rotation axis, and a spiral pattern is provided on the surface of the columnar member so that it can be easily seen that the columnar member is rotating. 34 is arranged. Note that the display unit 32 is not limited to a cylindrical shape, and may be a polygonal shape such as a quadrangular prism.

  When the water supplied to the paddy field reaches the set water level and the water flows over the drain pipe 10, the impeller 21 rotates, and the rotation of the main shaft 22 is transmitted to the support shaft 33 connected to the transmission mechanism 31, and the display unit 32 rotates. When the worker on the intake port 3 side confirms the rotation of the display unit 32, the worker can close the weir 7 of the intake port 3 and stop the supply of water to the paddy field 4.

  It should be noted that an appropriate notch is formed as a resonance part on the outer periphery in the circumferential direction of the columnar member of the display unit 32, and when the display unit 32 rotates, the surrounding air flows and a wind noise is generated or a whistle is installed. Even if it is difficult to confirm the visual observation of the display unit 32 such as early morning, evening, or after sunset, the worker has supplied the paddy with sound. It can be confirmed that the water has reached the set water level and the water has overflowed into the drain pipe 10.

  Furthermore, as shown in FIG. 4, one end of the string 35 is fixed to the outer periphery in the circumferential direction of the columnar member of the display unit 32, and a weight 36 is tied to the other end, and the display unit 32 rotates around the display unit 32 as it rotates. It may be configured to rotate and periodically abut against the drum 37 provided in the support portion 23 to generate sound.

  As shown in FIG. 5, a power generation unit 40 that generates power by the rotational power of the main shaft 22 may be further provided.

  The power generation unit 40 includes a magnet 41 fixed to the main shaft 22 and a coil 42 disposed around the magnet 41, generates power using the rotation of the main shaft 22, and emits the light bulb 44 with the power generated by the drive circuit 43. It is configured to let you.

  The light bulb 44 may be incorporated in a columnar member as the display unit 32, or may be provided along with the columnar member, and instead of the columnar member, the light bulb itself is a display unit. Also good. Further, instead of or in addition to the light emitting unit (bulb 44), a buzzer driven by the power generated by the power generation unit 40, or a sound generation unit such as a siren or a bell may be provided. Note that the power generation unit 40 may be incorporated in the bearing 24.

  Further, as shown in FIGS. 6A and 6B, when the portion where the impeller 21 is installed in the drain pipe 10 is defined as the reduced diameter portion 10a, the reduced diameter portion 10a is reduced below the reduced diameter portion 10a. An enlarged diameter portion 10b having a diameter larger than the diameter of the diameter portion 10a is connected.

  The support portion 23 supports the main shaft 22 and the bearing 24 via a spring 25 as an elastic member that biases upward, and the impeller 21 is installed in the reduced diameter portion 10 a of the drain pipe 10.

  By configuring in this way, when foreign matter 19 such as foreign matters flowing out with the overflowing water gets entangled with the impeller 21 and the weight applied to the impeller 21 increases, the upward biasing force by the spring 25 is resisted, The impeller 21 descends to the enlarged portion 10b of the drain pipe 10, and the foreign matter 19 is easily detached. Therefore, even when the rotation of the impeller 21 is hindered or the drain pipe 10 is clogged, when the weight applied to the impeller 21 increases due to the entanglement of the foreign matter 19, the spring 25 is elastically deformed and the blade The vehicle 21 is lowered to the enlarged diameter portion 10b, the foreign matter 19 is detached from the impeller 21, and then automatically returns to a normal state, so that the maintenance work can be saved.

  In the embodiment described above, the configuration in which the impeller 21 is rotated by the overflowing water and the display unit 32 is rotated has been described. However, the display unit may be configured to swing. Hereinafter, another embodiment of the drainage basin according to the present invention will be described. In addition, about the structure similar to the above-mentioned embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 7A and 7B, the transmission mechanism that transmits the power of the main shaft 22 to the notification unit 60 includes a motion conversion mechanism 50 that converts the rotational motion of the main shaft 22 into a reciprocating motion.

  The motion conversion mechanism 50 includes a bevel gear 51 that rotates integrally with the main shaft 22, a bevel gear 52 that meshes with the bevel gear 51, a first arm member 54 that rotates integrally with the rotation shaft 53 of the bevel gear 52, and one end of the first arm member 54. The second arm member 55 is rotatably supported by the first arm member 55, and a display unit 61 serving as a notification unit 60 is provided at one end of the second arm member 55. The display unit 61 is swingably attached to the second arm member 55 by a shaft 62, and the display unit 61 is surrounded by a mantle member 56 formed of transparent glass, ABS resin, polypropylene, or the like. Yes. The rotating shaft 53 of the bevel gear 52 is supported by a bearing (not shown) so as not to interfere with the rotational movement of the first arm member 54 and the second arm member 55.

  As shown in FIGS. 8A, 8 </ b> B, 8 </ b> C, and 8 </ b> D, the rotation of the main shaft 22 is transmitted to the rotation shaft 53 of the bevel gear 52 through the bevel gear 51, and is integrated with the rotation shaft 53. The arm member 56 rotates.

  Since the display portion 61 provided at one end of the second arm member 57 is restricted from moving in the vertical direction by the outer cover member 58, the display portion 61 is displayed by the movement of the second arm member 57 connected to the first arm member 56. The part 61 reciprocates up and down in the outer member 58.

  Therefore, the worker can confirm that the water supplied to the paddy field reaches the set water level and the water has overflowed into the drain pipe 10 by the vertical movement of the display unit 61.

Furthermore, another embodiment of the motion conversion mechanism will be described.
As shown in FIG. 9, the motion conversion mechanism 70 may be configured by a non-circular cam 71 fixed to the upper portion of the main shaft 22 and a rod-shaped member 72 formed of elastic plastic or the like. The rod-like member 72 includes a flag 73 as a display unit at the top, and the lower end is fixed to the support unit 23.

  The rod-like member 72 is installed within the circumference of the top portion 71a of the cam 71, and is configured to be swung by periodically contacting the top portion 71a of the cam 71 when the cam 71 is rotated by the rotation of the main shaft 22. ing.

  Therefore, the worker can confirm that the water supplied to the paddy field has reached the set water level and the water has overflowed into the drain pipe 10 by swinging the flag 73 as the display unit. Further, for example, a combination of a bevel gear and a cam may be configured to perform various movements such as the display unit swinging in the vertical direction.

  In any of the above-described embodiments, the impeller 21 is installed in the vertical pipe 12 of the drain pipe 10 and the axis of the main shaft 22 is in the vertical direction. However, the impeller is disposed in the horizontal pipe 13 or It may be configured to be installed outside the outlet 13a so as to take out the power of the main shaft.

  Further, as shown in FIGS. 10A and 10B, the conversion unit has a plate-like body 81 that receives the flow of the water that has overflowed into the drain pipe 10 and a support shaft 82 of the plate-like body 81 upward. A support portion 23 supported via a spring 25 as an elastic member to be urged, and a notification portion 83 includes a flag 84 provided on the upper portion of the support shaft 82, a bee 85 installed on the support shaft 82, You may comprise with the bell 86 installed in the support part 23. FIG. The plate-like body 81 is disposed in the reduced diameter portion 10a of the drain pipe 10 when there is no overflow of water.

  When the water overflows into the drain pipe 10, the plate-like body 81 descends to the enlarged diameter portion 10b against the urging force of the spring 25 due to the overflowing water. Along with this, the flag 84 provided on the support shaft 82 descends, and the bee 85 rings the bell 86.

  Moreover, although the structure provided with the drain pipe 10 was demonstrated in the above-mentioned embodiment, a water level is provided by providing a plate-shaped overflow dam without moving the drain pipe 10, and moving the plate-shaped overflow dam up and down. It can be applied to adjustable drainage. That is, a drainage basin that drains the water supplied to the paddy field from the paddy field and maintains the water level at a predetermined level, wherein the energy of the overflow weir that overflows the water and the water that overflows is converted into mechanical energy. A drainage basin having a conversion unit for conversion and a notification unit driven by mechanical energy converted by the conversion unit is realized.

  As the conversion unit, for example, a rotating body such as a water wheel rotating with the flow of irrigation water overflowing the overflow weir may be provided, and a driving mechanism that drives the notification unit based on the rotational movement of the rotating body may be provided.

  The specific configuration of the drainage tub described above is not limited to the description of the embodiment, and it is needless to say that the design can be changed as appropriate within the scope of the effects of the present invention.

1: River 2: Irrigation channel 3: Intake port 4: Paddy field 5: Drainage trough 6: Drainage channel 7: Weir 10: Drainage pipe 10a: Reduced diameter part 10b: Expanded diameter part 11: Inflow part 14: Movable pipe 20: Conversion part 21: Impeller 22: Main shaft 23: Support unit 24: Bearing 25: Spring 30: Notification unit 31: Transmission mechanism 32: Display unit 33: Support shaft 40: Power generation unit 44: Light bulb

Claims (7)

A drainage trough that drains water supplied to a paddy field from the paddy field and maintains the water level at a predetermined level.
An overflow weir through which the water flows;
A conversion unit that converts the energy of the overflowing water into mechanical energy;
A drainage basin provided with a notifying unit driven by mechanical energy converted by the converting unit. The conversion unit includes an impeller that is rotated by a flow of irrigation water that has passed through the overflow weir, and a support unit that supports the main shaft of the impeller,
The drainage basin according to claim 1, wherein the notification unit includes a transmission mechanism to which rotational power of the main shaft is input, and a display unit whose state is displaced by the power transmitted from the transmission mechanism.   The transmission mechanism includes a motion conversion mechanism that connects the main shaft and a support shaft of the display unit, and converts a rotational motion of the main shaft into a reciprocating motion, and the display unit reciprocates by the motion conversion mechanism. 2. Drainage tank according to 2.   The drainage basin according to claim 2 or 3, wherein the display portion includes a resonance portion that generates sound when ambient air flows in with a change in state. A power generation unit that generates power by the rotational power of the main shaft;
The drainage basin according to any one of claims 2 to 4, wherein the display unit includes a light emitting unit or a sounding unit that is driven by the electric power generated by the power generation unit. The overflow weir is composed of a drain pipe having an enlarged diameter portion,
The impeller is installed in the drain pipe via an elastic member that biases upward,
The foreign object is entangled with the impeller, and when the weight applied to the impeller is increased, the impeller is configured to descend to the expansion portion of the drain pipe against the urging force of the elastic member. The drainage basin according to any one of 2 to 5. A movable pipe capable of adjusting the water level overflowing the drain pipe by moving up and down relative to the drain pipe at the inflow portion of the drain pipe,
The drainage basin according to claim 6, wherein the support portion is fixedly installed at a position that does not interfere with the vertical movement of the movable tube.

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