KR102304830B1 - Water gauge system - Google Patents

Abstract

The present invention relates to a water level measuring system which comprises: a water level measuring unit which is placed in a manhole or a filtering-type treatment facility pre-treatment chamber for measuring the water level of the used water discharged to the outside after being introduced into the manhole or the filtering-type treatment facility pre-treatment chamber, and which allows a pressure gauge to detect changes in an air pressure in a chamber installed with an end unit inserted into the water and to measure the water level; and an inspection unit which includes a user terminal which receives the information on the water level measured by the water level measuring unit by an Internet-of-Things (IoT) method, and which determines the normal or abnormal operation of the manhole or the filtering-type treatment facility pre-treatment chamber and the facilities connected to them. The present invention is able to allow a user to check the normal or abnormal operation of a manhole or a filtering-type treatment facility pre-treatment chamber and facilities connected to them, to perform an efficient management, increasing the filtering efficiency at the same time, and increasing the life of the purifying apparatus.

Description

Water level measurement system {WATER GAUGE SYSTEM}

The present invention relates to a water level measurement system, and more particularly, to a water level measurement system that enables efficient management by confirming whether a manhole or a filtration type treatment facility pretreatment tank and the facilities connected thereto are operating normally. .

Rainwater catchment is a facility for collecting and discharging rainwater formed on the upper surface of roads and bridges during rainfall. In order to reduce the inflow of pollutants into sewage pipes and rivers, a predetermined initial rainwater treatment facility is sometimes provided.

However, there is a problem in that it is difficult to continuously monitor and manage the entire facility with only a small number of personnel as the conventional initial rainwater treatment facilities are mostly buried underground, and are installed in multiple branches.

In other words, since there is no measuring equipment such as a water level gauge that can determine whether the conventional initial rainwater treatment facilities installed underground in a number of branches are operating properly and whether maintenance such as replacement of a separate filter media or repair of the facility is necessary. There is a problem in that monitoring is more difficult.

The present invention has been devised in order to solve the above problems, and it is possible to check whether the pre-treatment tank of a manhole or a filtration type treatment facility and the facilities connected thereto are operating normally so that efficient management can be made and at the same time, the efficient management of the purification apparatus The purpose is to provide a water level measurement system that can increase the filtration efficiency through management and increase the lifespan of the purifier.

The water level measurement system for achieving the object of the present invention as described above is the inside of the manhole or filtration type treatment facility pretreatment tank to measure the water level of the used water flowing out after flowing into the manhole or the filtration type treatment facility pretreatment tank a water level measuring unit provided in the water level measurement unit to measure the water level by sensing a change in air pressure inside the chamber installed in the form of an end inserted into the water; A monitoring unit composed of a user terminal that receives information about the water level measured by the water level measurement unit by the IoT method and determines whether the manhole or filtration type treatment facility pretreatment tank and facilities connected to them operate normally. characterized by including.

Here, the water level measuring part forms an exterior and includes a housing having an accommodation space for accommodating parts, the chamber having one end connected to the housing and the other end being inserted into the water; The pressure gauge disposed at one end of the chamber to measure a change in air pressure inside the chamber, a circuit unit for converting the change in air pressure measured by the pressure gauge into water level data, and an antenna for transmitting the data converted by the circuit unit to the user terminal and a battery for supplying power to the pressure gauge, the circuit unit, and the antenna.

In addition, a fixed bar formed to have a 'L'-shaped longitudinal cross-section and having a constant length is installed on the inner upper wall of the pretreatment tank of the manhole or filtration type treatment facility so as to install the water level measuring unit, and the outer surface of the fixed bar is ' A hook member having a B'-shaped longitudinal cross-section and having a hook ring hooked on the upper surface of the fixing bar is attached to the outer surface of the fixing bar in close contact, and the housing may be fixed to the outer surface of the hook member.

In addition, the hook member is movably installed along the longitudinal direction of the fixing bar, and may be fixed to the fixing bar by a separate fixing screw.

In addition, to prevent the flow of the chamber, one end is fixed to the inner wall of the pretreatment tank of the manhole or filtration type treatment facility, and the other end is a chamber fixing means provided with a ring-shaped ring member inserted to surround the outer surface of the chamber. can be provided.

In addition, the chamber fixing means is installed to be slidably movable along the longitudinal direction of the chamber and may be fixed to the wall of the manhole or the pretreatment tank of the filtration type treatment facility at a desired position.

In addition, the end of the chamber fixing means may be slidably installed in the sliding groove of the support bar having a sliding groove incised on one side and fixed to the wall of the manhole or the pretreatment tank of the filtration type treatment facility.

In addition, when the water level of the manhole or the pretreatment tank of the filtration type treatment facility is low, an auxiliary tube made of a flexible material that is installed in communication with the chamber and is bent to be submerged in water may be installed at the end of the chamber.

In addition, a foreign material inflow prevention member in the form of a mesh for preventing foreign substances in the water from entering the inside of the chamber may be installed at the end of the chamber inserted into the water.

In addition, a floating flexible mat having a flat lower surface and floating in water may be inserted into the outer surface of the chamber to prevent water level deviation when a wave is generated due to turbulence.

In addition, a floating material inflow blocking wall may be provided on the circumferential surface of the flexible mat to prevent the inflow of the floating material by extending a certain length downward along the thickness direction of the flexible mat.

In addition, the chamber may be formed to have a streamlined longitudinal cross-section to minimize the resistance to the flow of water inside the manhole or the pretreatment tank of the filtration type treatment facility.

In addition, when the water level measuring unit is installed in a place where the intensity of radio waves is lowered, the antenna is disposed inside the protective cover installed on the road sign bottle or manhole cover provided on the upper part of the pretreatment tank of the manhole or filtration type treatment facility, and is exposed to the ground can be

In addition, a see-through window is installed on the side of the protective cover to increase the transmission/reception rate of radio waves, and a separate solar cell panel is provided on the upper surface to charge the battery.

In addition, the user terminal may be provided with an alarm unit having an alarm function to determine the abnormal situation when a sudden change in water level occurs inside the manhole or the pretreatment tank of the filtration type treatment facility and notify the user.

As described above, the water level measurement system according to the present invention enables efficient management by checking whether the pre-treatment tank of a manhole or filtration type treatment facility and the facilities connected thereto are normally operated, and at the same time, efficient management of the purification device. This has the effect of increasing the filtration efficiency and extending the life of the purifier.

1 is a plan view showing the overall structure of a water level measurement system according to an embodiment of the present invention,
2 is a perspective view showing the structure of the water level measuring unit of the present invention,
3 is a longitudinal cross-sectional view showing the structure of the water level measuring part of the present invention,
4 is a longitudinal cross-sectional view showing a structure in which the water level measuring part of the present invention is installed in the manhole and connected to the manhole cover;
5 is a longitudinal sectional view showing a structure in which the water level measuring unit of the present invention is installed in a manhole or a pretreatment tank of a filtration type treatment facility and connected to a road sign;
6 is a plan view showing a structure in which an auxiliary tube is connected to the end of the water level measuring unit of the present invention;
7 is a schematic diagram schematically illustrating a connection structure of the water level measurement system of FIG. 1 .

Hereinafter, a water level measurement system according to an embodiment of the present invention will be described in detail based on the accompanying drawings.

Figure 1 is a plan view showing the overall structure of the water level measuring system according to an embodiment of the present invention, Figure 2 is a perspective view showing the structure of the water level measuring unit of the present invention, Figure 3 is the structure of the water level measuring unit of the present invention 4 is a longitudinal sectional view showing a structure in which the water level measuring unit of the present invention is installed in a manhole and connected to the manhole cover, and FIG. It is a longitudinal cross-sectional view showing a structure connected to a road sign, FIG. 6 is a plan view showing a structure in which an auxiliary tube is connected to the end of the water level measuring unit of the present invention, and FIG. 7 is a schematic view of the connection structure of the water level measuring system of FIG. It is a schematic diagram shown.

As shown in these drawings, the water level measurement system according to the present invention measures the water level of the used water flowing out after flowing into the manhole 100 or the pre-treatment tank 200 of the filtration type treatment facility. (100) or a water level measuring part ( 310) and; Information on the water level measured by the water level measurement unit 310 is received by the IoT method, stored and analyzed, and It is configured to include a monitoring unit 300 made of a user terminal 320 to determine whether the normal operation.

The manhole 100 is a space made for a worker to enter and exit to check, connect, repair, or clean an underground water pipe, sewage pipe, wiring, underground communication cable, pavement, and the like.

And, the pre-treatment tank 200 of the filtration type treatment facility is a space formed to filter and purify the imported used water and then discharge it back to the outside, and may be installed to be connected to a facility such as the manhole 100 or installed alone. It can also be used for filtration.

The water level measuring unit 310 constituting the water level measurement system according to the present invention is installed in the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility, and the water level inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility It is a device for effectively maintaining and managing the facility by measuring the change so that it can be checked whether there is an abnormality in the facility connected to the front or rear end of the facility.

That is, when a sudden change in water level is detected inside the manhole 100 or the pretreatment tank 200 of the filtration treatment facility, the facility connected to the rear end of the manhole 100 or the pretreatment tank 200 of the filtering treatment facility does not operate normally. It is judged that the drainage is not performed properly, so by inspecting these facilities, the normal drainage operation is made, so that effective maintenance and management is possible.

The monitoring unit 300 serves to prevent the filtration efficiency from being lowered by allowing the administrator to accurately recognize the cleaning or replacement timing of the filter medium 220 of the purification unit 200 due to the repeated purification operation of the purification unit 200 being performed. do

The monitoring unit 300 is located in the lower part of the manhole above the manhole 100 or the filtration-type treatment facility pre-treatment tank 200 to measure the water level that is purified after it flows into the manhole 100 or the pre-treatment tank 200 of the filtering-type treatment facility. It is provided with a water level measuring unit 310 that detects a change in air pressure inside the chamber installed with the end inserted into the water to measure the water level, and the water level measured by the water level measuring unit 310. It consists of a user terminal 320 that receives, stores and analyzes information delivered by the IoT method to determine whether to wash or replace the filter medium 220 of the purification unit 200 .

The water level measuring unit 310 forms an exterior and includes a housing 311 provided with an accommodating space for accommodating parts, and a chamber 312 having one end connected to the housing 311 and the other end inserted into the water. ), a pressure gauge 313 disposed at one end of the chamber 312 inside the housing 311 to measure a change in air pressure inside the chamber 312, and a change in air pressure measured by the pressure gauge 313 into water level data A circuit unit 314 for transmitting power, an antenna 315 for transmitting the data converted by the circuit unit 314 to the user terminal 320, a pressure gauge 313, a circuit unit 314, and an antenna 315 for supplying power It is configured to include a battery (316).

The housing 311 is a rectangular member having an accommodating space shielded from the outside, and the accommodating space can accommodate various components such as the chamber 312 , the pressure gauge 313 , and the circuit unit 314 .

The chamber 312 is a tubular member having a certain length, and the chamber 312 has a streamlined longitudinal section to minimize the resistance to the flow of water inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility. It is preferably formed to have.

One end of the chamber 312 communicates with one side of the lower surface of the housing 311, and the other end is installed to be inserted into the water existing in the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility, the manhole 100. However, it serves to enable the pressure gauge 313 disposed on the upper side of the chamber 312 to detect a change in pressure according to a change in the water level inside the pretreatment tank 200 of the filtration type treatment facility.

And, the chamber 312 is a ring-shaped one end is fixed to the wall of the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility to prevent flow, and the other end is inserted to surround the outer surface of the chamber 312 The ring member 361 is fixedly installed by the chamber fixing means 360 provided.

The chamber fixing means 360 is installed to be slidably movable along the longitudinal direction of the chamber 312 so that it is disposed at a desired position is effective in improving the degree of freedom of design.

In addition, the chamber fixing means 360 is a manhole 100 or a filtration type treatment facility pretreatment tank so that the housing 311 can continuously support the chamber 312 even when it moves along the longitudinal direction of the fixing bar 330 to be described later. It is preferable that the end is assembled to a separate support bar 362 that is fixed to one side wall of the 200 and installed.

A sliding groove 362a is cut in one side of the support bar 362 so that the end of the chamber fixing means 360 can be slidably moved in a state assembled to the support bar 362 , and the end of the chamber fixing means 360 . It is effective to further improve the degree of freedom in design and to improve installation workability by being slidably assembled in the sliding groove 362a.

And, when the water level inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility is low, it is installed in communication with the chamber 312 at the end of the chamber 312 and is a flexible material that is bent to be submerged in water. By installing the tube 317, it is preferable that the pressure gauge 313 detects even a minute change in pressure according to a change in the water level.

In addition, at the end of the chamber 312 inserted into the water, a mesh-shaped foreign matter inflow prevention member 318 is installed to prevent foreign substances in the water from flowing into the chamber, and on the outer surface of the chamber 312 is turbulent flow. It is effective to insert and install the floating flexible mat 319 having a flat lower surface and floating in water to prevent the water level deviation when the wave is generated.

The flexible mat 319 may be formed of any material as long as it can float in water, and on the circumferential surface of the flexible mat 319, a floating material extending downward by a certain length along the thickness direction of the flexible mat 319 is formed. It is preferable that an inflow blocking wall 319a is provided.

The pressure gauge 313 is disposed above the area in which the housing 311 communicates with the chamber 312 in the housing 311 and serves to sense a change in air pressure inside the chamber 312 according to a change in water level.

The circuit unit 314 is electrically connected to the pressure gauge 313 to convert the change in air pressure measured by the pressure gauge 313 into water level data so that the facility manager can visually determine the change in water level.

The antenna 315 serves to transmit the data converted by the circuit unit 314 to the user terminal 320, and the battery 316 includes the antenna 315, the pressure gauge 313, the circuit unit 314 and the antenna ( 315) to supply power.

If the water level measuring unit 310 is installed in a place where the intensity of radio waves is lowered, the antenna 315 is a road sign bottle or a manhole cover provided on the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility. It is effective to increase the transmission/reception rate of radio waves by being disposed inside the protective cover 370 installed on the surface and exposed to the ground.

In addition, a see-through window 371 is installed on the side of the protective cover 370 to further increase the transmission/reception rate of radio waves, and a separate solar cell panel 372 is provided on the upper surface so that the battery 316 is charged. It is preferable to do

On the other hand, the upper wall of the manhole 100 or the filtration type treatment facility pretreatment tank 200 so that the water level measuring unit 310 can be installed inside the manhole 100 or the filtration type treatment facility pretreatment tank 200 is 'L' shaped A fixing bar 330 formed to have a vertical cross-section of the shape and having a constant length is installed, and the outer surface of the fixing bar 330 has a 'L'-shaped vertical cross-section and a hook ring caught on the upper surface of the fixing bar 330 . The hook member 340 provided with the 341 is attached to the outer surface of the fixing bar 330 in close contact, and the housing 311 is fixed to the outer surface of the hook member 340 .

By the configuration of the fixing bar 330 and the hook member 340 , the hook member 340 is installed movably along the longitudinal direction of the fixing bar 330 , and the fixing bar ( 340 ) is installed by a separate fixing screw ( 350 ). 330) to be fixed.

The user terminal 320 receives information about the water level inside the manhole 100 or the pre-treatment tank 200 of the filtration type treatment facility measured by the water level measuring unit 310 by the IoT communication method to store and analyze the information. plays a role

In addition, the user terminal 320 determines that it is an abnormal situation when a sudden change in water level occurs inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility, and an alarm unit 400 having an alarm function to notify the user. ) is effective.

The monitoring method of the water level measurement system according to the present invention having such a configuration is as follows.

First, the water level inside the manhole 100 or the filtration type treatment facility pretreatment tank 200, which is changed during the initial inflow of rainwater, is measured by the water level measuring unit 310, and the water level measured by the water level measuring unit 310 is The step of transmitting the information to the user terminal 320 side by the IoT communication method proceeds.

The water level measuring unit 310 allows the pressure gauge 313 to detect the change in air pressure inside the chamber 312 according to the water level change in the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility, and the pressure gauge 313. Converts the change in air pressure sensed by the circuit unit 314 into water level change data so that the facility manager can check the change in water level.

And, this water level change data is transmitted to the user terminal 320 side through the antenna 315, and the user terminal 320 receives information about the measured water level and stores and analyzes the information. do.

When explaining the method of analyzing the information in more detail, the water level inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility measured by the water level measuring unit 310 is the difference in the degree of change in the water level according to the degree of rainfall. , and when the relationship between the water level change with respect to the rainfall is converted into a graph and displayed, the slope of the water level change function with respect to the rainfall is displayed.

If this slope is within the standard range indicating the same value as the slope value calculated in advance during normal operation of the water level measurement system of the present invention, it is determined that it is operating normally, and the value of this slope is calculated in advance during normal operation. If it is greater than the slope value, it is determined as an abnormal situation because it is out of the standard range because the water level changes according to the rainfall amount.

When it is determined that this is an abnormal situation, by notifying the monitor through the alarm unit 400 of the user terminal 320, the monitor operates the manhole 100 or the facility connected to the rear end of the pretreatment tank 200 of the filtration type treatment facility normally. By performing a check to ensure that the water level measurement system of the present invention operates normally.

And, even though rain continues, if the slope value is smaller than the slope value calculated in advance during normal operation, the rainwater introduced into the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility is not purified. Since it is a situation in which it is leaked to the outside, it is determined that the water level measurement system of the present invention is broken, and the entire system including the space forming unit 100 and the purification unit 200 of the water level measurement system is checked.

By the monitoring method of the water level measurement system according to the present invention as described above, it is possible to accurately determine when to wash the filter media provided in the purification unit of the non-point pollution reduction facility, so that the purification device can be efficiently managed. Efficient management of the purifier can increase the filtration efficiency and increase the life of the purifier.

Since the above has only been described with respect to a part of a preferred embodiment that can be implemented by the present invention, the scope of the present invention as noted should not be construed as being limited to the above one embodiment, and the It will be said that the technical idea of the invention and the technical idea having its roots are all included in the scope of the present invention.

100: manhole 200: filtration type treatment facility pre-treatment tank
300: monitoring unit 310: water level measuring unit
311: housing 312: chamber
313: pressure gauge 314: circuit part
315: antenna 316: battery
317: auxiliary tube 318: foreign matter inflow prevention member
319: floating flexible mat 320: user terminal
330: fixing bar 340: hook member
341: hook hook 350: fixing screw
360: chamber fixing means 361: ring member
370: protective cover 400: notification unit

Claims (15)

delete delete Provided inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility to measure the level of the used water flowing out after flowing into the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility and a water level measuring unit 310 for measuring the water level by sensing a change in air pressure inside the chamber installed in the form of an end inserted into the water;
Information on the water level measured by the water level measurement unit 310 is received by the IoT method, stored and analyzed, and and a monitoring unit 300 comprising a user terminal 320 to determine whether a normal operation is performed,
The water level measuring unit 310 forms an exterior and includes a housing 311 having an accommodating space for accommodating parts, one end connected to the housing 311 and the other end inserted into the water chamber. 312, the pressure gauge 313 disposed at one end of the chamber 312 inside the housing 311 to measure a change in air pressure inside the chamber 312, and the air pressure measured by the pressure gauge 313 A circuit unit 314 for converting a change of Δ into water level data, an antenna 315 for transmitting the data converted by the circuit unit 314 to the user terminal 320, the pressure gauge 313, and the circuit unit 314 and a battery 316 for supplying power to the antenna 315 side,
A fixed bar 330 formed to have a 'L'-shaped longitudinal section on the inner upper wall of the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility so that the water level measuring unit 310 can be installed and having a constant length. ) is installed, and the outer surface of the fixing bar 330 has a 'L'-shaped longitudinal section and the hook member 340 provided with a hook ring 341 caught on the upper surface of the fixing bar 330 is the fixing bar. The water level measuring system, characterized in that it is closely attached to the outer surface of the (330), and the housing (311) is fixed to the outer surface of the hook member (340). 4. The method of claim 3,
The hook member (340) is movably installed along the longitudinal direction of the fixing bar (330) and is fixed to the fixing bar (330) by a separate fixing screw (350). 4. The method of claim 3,
To prevent the flow of the chamber 312, one end is fixed to the wall inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility, and the other end is inserted to surround the outer surface of the chamber 312 The water level measurement system, characterized in that the chamber fixing means (360) provided with the ring-shaped ring member (361). 6. The method of claim 5,
The chamber fixing means (360) is installed to be slidably movable along the longitudinal direction of the chamber (312) and is fixed at a desired position. 7. The method of claim 6,
The end of the chamber fixing means 360 has a sliding groove 362a cut in one side and the sliding of the support bar 362 fixed to the wall of the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility. The water level measurement system, characterized in that it is slidably installed in the groove (362a). Provided inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility to measure the level of the used water flowing out after flowing into the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility and a water level measuring unit 310 for measuring the water level by sensing a change in air pressure inside the chamber installed in the form of an end inserted into the water;
Information on the water level measured by the water level measurement unit 310 is received by the IoT method, stored and analyzed, and and a monitoring unit 300 comprising a user terminal 320 to determine whether a normal operation is performed,
When the water level of the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility is low, it is installed in communication with the chamber 312 at the end of the chamber 312 and is a flexible material that is bent to be submerged in water. The water level measurement system, characterized in that the tube (317) is installed. 9. The method of claim 8,
A water level measurement system, characterized in that a mesh-type foreign material inflow prevention member (318) is installed at the end of the chamber (312) inserted into the water to prevent foreign materials in the water from flowing into the chamber. Provided inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility to measure the level of the used water flowing out after flowing into the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility and a water level measuring unit 310 for measuring the water level by sensing a change in air pressure inside the chamber installed in the form of an end inserted into the water;
Information on the water level measured by the water level measurement unit 310 is received by the IoT method, stored and analyzed, and and a monitoring unit 300 comprising a user terminal 320 to determine whether a normal operation is performed,
A water level measurement system, characterized in that a floating flexible mat 319 having a flat lower surface and floating in water is inserted into the outer surface of the chamber 312 to prevent water level deviation when a wave is generated due to turbulence. 11. The method of claim 10,
A water level measuring system, characterized in that a floating material inflow blocking wall (319a) is provided on the circumferential surface of the flexible mat (319) to prevent the inflow of floating materials by extending a certain length downward along the thickness direction of the flexible mat (319). . 11. The method of claim 10,
The chamber 312 is a water level measurement system, characterized in that it is formed to have a streamlined longitudinal section so as to minimize the resistance to the flow of water inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility. delete Provided inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility to measure the level of the used water flowing out after flowing into the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility and a water level measuring unit 310 for measuring the water level by sensing a change in air pressure inside the chamber installed in the form of an end inserted into the water;
Information on the water level measured by the water level measurement unit 310 is received by the IoT method, stored and analyzed, and and a monitoring unit 300 comprising a user terminal 320 to determine whether a normal operation is performed,
The water level measuring unit 310 forms an exterior and includes a housing 311 having an accommodating space for accommodating parts, one end connected to the housing 311 and the other end inserted into the water chamber. 312, the pressure gauge 313 disposed at one end of the chamber 312 inside the housing 311 to measure a change in air pressure inside the chamber 312, and the air pressure measured by the pressure gauge 313 A circuit unit 314 for converting a change of Δ into water level data, an antenna 315 for transmitting the data converted by the circuit unit 314 to the user terminal 320, the pressure gauge 313, and the circuit unit 314 and a battery 316 for supplying power to the antenna 315 side,
When the water level measuring unit 310 is installed in a place where the intensity of radio waves is lowered, the antenna 315 is installed on the manhole 100 or the road sign bottle or manhole cover provided on the top of the pretreatment tank 200 of the filtration type treatment facility. It is disposed inside the installed protective cover 370 and exposed to the ground,
A see-through window 371 is installed on the side of the protective cover 370 to increase the transmission/reception rate of radio waves, and a separate solar cell panel 372 is provided on the upper surface to charge the battery 316, characterized in that water level measurement system. 15. The method according to any one of claims 3 to 12, 14,
The user terminal 320 determines that it is an abnormal situation when a sudden change in water level occurs inside the manhole 100 or the pretreatment tank 200 of the filtration type treatment facility, and the alarm unit 400 has an alarm function to notify the user. Water level measurement system, characterized in that provided.

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