JP2021055373A - Rainwater pump control device, rainwater pump control method, computer program and rainwater wastewater treatment system - Google Patents

Abstract

To provide a rainwater pump control device that can take measures against outflow of polluted matter to public water areas due to the first flush during frequent rainfall while ensuring inundation control capability during heavy rain by controlling operation of a rainwater pump.SOLUTION: The rainwater pump control device of an embodiment comprises: pumping rainwater stored in a pump well to start the rainwater pump that discharges the rainwater to public water areas when a water level of the pump well that stores the rainwater flowing in from a sand basin exceeds a predetermined water level and a rainwater inflow amount flowing into the sand basin exceeds a first predetermined rainwater inflow amount.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to a rainwater pump control device, a rainwater pump control method, a computer program, and a rainwater wastewater treatment system.

In recent years, the frequency of localized heavy rainfall has increased due to the effects of global climate change. Rainwater drainage pipelines and rainwater pumps to prepare for the natural phenomenon of heavy rain, which has no quantitative limit, will be laid or installed by the local government after examining the required capacity. Operation of rainwater drainage pipelines and rainwater pumps
The first priority is to ensure that the drainage capacity is fully utilized and to prevent inundation and inland flooding in the area.

In addition, the sewage removal method is roughly divided into a merging type and a sewage type. The combined type is a method of collecting sewage such as domestic wastewater and rainwater derived from rainfall that cannot penetrate the ground in the same pipe, and the split type is a method of collecting sewage and rainwater in separate pipes. is there. The combined type has the problem that the amount of water to be removed during rainfall is excessive compared to the sewage treatment capacity, and although it is diluted with rainwater, some of the pollutants derived from sewage will flow out into public water areas as rainwater. .. In the split flow type, pollutants derived from sewage do not flow out into public water areas, but pollutants that flow into and accumulate in pipelines via the ground surface flow down together when there is rainfall above a certain flow rate. Sometimes. As a result, temporarily
There is concern that pollutants will be intensively discharged into public water bodies. This temporary outflow of pollutants is called the "first flush".

In the case of the diversion type, rainwater is pumped at the rainwater pump station at the end of the pipeline or the rainwater pump facility (almost the same facility except for the location) in the sewage terminal treatment plant and discharged to the public water area.

Rainwater pumping equipment, which is installed in relatively large capacity and small numbers for economic reasons, is often installed.
It has sufficient capacity for rainfall even when compared with the capacity of a single machine. In addition, as a general operation control method, a simple operation stop method under pump well water level conditions is adopted. There is no problem with this idea from the viewpoint of inundation control, but there are also points that need improvement from the viewpoint of pollutant outflow to public water areas.

As described above, there is a problem that the conventional technique cannot achieve both the inundation control ability at the time of heavy rain and the countermeasure against the outflow of pollutants into the public water area due to the first flush in the rainy weather.

JP-A-2018-111977

The problem to be solved by the present invention is to prevent the outflow of pollutants to public water areas due to the first flush during frequent rainfall, while ensuring the inundation control ability during heavy rain by controlling the operation of the rainwater pump. The purpose is to provide a rainwater pump control device.

In order to solve the above problems, in the rainwater pump control device of the embodiment, the water level of the pump well that stores the rainwater flowing from the sand pond exceeds the predetermined water level, and the amount of rainwater flowing into the sand pond is the first default. When the flow rate is exceeded, the rainwater pump that pumps the rainwater stored in the pump well and discharges it to the public water area is started.

The block diagram for showing the rainwater pump control device of 1st Embodiment. The figure which shows the start-up operation in the rainwater pump control device of 1st Embodiment. The figure which shows the start and stop operation in the rainwater pump control device of 1st Embodiment. The figure which shows the stop operation in the rainwater pump control device of 2nd Embodiment. The figure which shows the start and stop operation in the rainwater pump control device of 2nd Embodiment. The block diagram for showing the rainwater pump control device of 3rd Embodiment.

Hereinafter, embodiments for carrying out the invention will be described.

(First Embodiment)
The rainwater pump control device of the first embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an outline of a rainwater pump control device according to an embodiment and a rainwater pump station including a process to be controlled. The rainwater pump station 10 shown in FIG. 1 includes an inflow culvert 1, a sand basin 2, a pump well 3, and a rainwater pump 4.
, Pump well water level gauge 5, and rainwater pump control device 100. Rainwater flows in due to rainfall 1
It flows into the sand basin 2 through the sand basin 2. In the sand basin 2, pollutants such as sand contained in rainwater settle, and the supernatant flows into the pump well 3. In the pump well 3, rainwater is pumped by the rainwater pump 4 and discharged to a river, which is a public water area. A rainwater pump control device 100 is used to control the rainwater pump 4.

The inflow culvert 1 is a drainage pipe connected to the sand basin 2, and rainwater flows into the sand basin 2. The sand basin 2 has a pool-like structure, and is treated to settle and remove pollutants in rainwater. The pump well 3 is installed on the most downstream side of the rainwater pump station 10, and stores rainwater from which pollutants such as sand have been removed in the sand basin 2. The rainwater pump 4 discharges the rainwater from the pump well 3 to a river, which is a public water area. The pump well water level gauge 5 is installed in the pump well 3 and measures the water level of the pump well 3. Then, the rainwater pump control device 100 acquires the signal of the pump well water level gauge 5, and controls the rainwater pump 4 based on the signal acquired by the method described later.

Next, the configuration of the rainwater pump control device 100 will be described. The rainwater pump control device 100 includes a rainwater inflow amount acquisition unit 101, a pump well water level acquisition unit 102, a flow rate determination unit 103, and a water level determination unit 104.
, The pump start / stop control unit 105 is provided. The rainwater inflow acquisition unit 101 acquires the signal of the pump well water level gauge 5, and acquires the inflow amount from the inflow culvert 1 to the sand basin 2 based on the rising speed of the water level of the pump well and the operating state of the rainwater pump 4. .. That is, the area of the sand basin 2 and the pump well 3
The amount of rainwater flowing into the sand basin 2 is obtained from the area of the pump well 3, the rate of rise of the water level of the pump well 3, and the pumping capacity of the rainwater pump 4. The pump well water level acquisition unit 102 acquires the water level of the pump well 3 from the signal of the pump well water level meter 5. The flow rate determination unit 103 is a means for determining whether or not the rainwater inflow amount exceeds the predetermined flow rate based on the signal of the rainwater inflow amount acquisition unit 101. The water level determination unit 104
This is a means for determining whether the water level of the pump well exceeds the predetermined water level based on the signal of the pump well water level acquisition unit 102. The pump start / stop control unit includes the flow rate determination unit 103 and the water level determination unit 104.
It is a means for starting and stopping the rainwater pump 4 and controlling the pumping capacity based on the signal of.

Next, the operation will be described.

With reference to FIG. 2, the control for starting the rainwater pump 4 when it rains while the rainwater pump 4 is stopped will be described.

In S201, first, the pump well water level acquisition unit 102 of the rainwater pump control device 100 acquires the water level of the pump well 3 from the pump well water level meter 5.

Next, in S202, the rainwater inflow acquisition unit 101 acquires the rainwater inflow from the inflow culvert 1 to the sand basin 2.

The amount of rainwater inflow is acquired based on the area of the sand basin, the water level of the pump well and the rising speed of the water level acquired by the pump well water level meter 5, and the pumping capacity of the rainwater pump 4 when it is operating. Also. The rising speed of the pump well water level may be obtained from the amount of change in the pump well water level in a predetermined time by time-differentiating the measured value of the pump well water level meter 5. Further, the area of the sand basin 2 and the area of the pump well 3 may not be fixed values, but may be derived and acquired as a function of the pump well water level.

Next, in S203, it is determined whether or not the water level of the pump well 3 exceeds the predetermined water level. This default water level is the lowest water level at which the rainwater pump 4 can be operated and the operation is started.

Depending on the situation, the default water level may be set by the operator or the administrator himself, or may be designed to be variable depending on the rainfall situation. Further, the default water level may be controlled to be automatically changed depending on the rainfall situation.

If the water level of the pump well 3 is lower than the predetermined water level, the rainwater pump 4 will not start.

If the water level of the pump well 3 exceeds the predetermined water level, the process proceeds to the next step S204.

Next, in S204, it is determined whether or not the inflow of rainwater exceeds the first predetermined flow rate.

The first predetermined flow rate is a phenomenon in which particles of pollutants do not settle in the sand basin 2 when the inflow of rainwater becomes large to some extent, and this is a condition for starting the occurrence of the phenomenon. Details of the first default flow rate will be described later.

When the particles of pollutants are precipitated and recovered in the sand basin 2, it is required to satisfy the following conditions.

Here, the amount of water flowing out of the sand basin is the amount of water flowing out from the sand basin 2 to the pump well 3.

The underlined items are the conditions specified at the time of design and construction, and the particle settling velocity is based on the assumed particle size. The predetermined flow rate determined at the time of design and construction on the right side of equation (3) is hereinafter referred to as "construction flow rate". If the construction flow derived from these exceeds the amount of sedimentation basin runoff, the sand basin will be fully capable. However, if the construction flow rate is less than or equal to the amount of sand basin runoff, the sand basin will not be fully capable.

The amount of rainwater inflow can be derived as follows.

When the rainwater pump 4 is stopped, the amount of pumped water from the rainwater pump is ignored.

The relationship between the amount of sand basin runoff and the amount of rainwater inflow is as follows.

Here, the volume of the sand basin and the pump well is not strictly determined by the area x the depth, but here it is assumed that the influence is small.

Further, the influence of the accompanying device such as a screen installed between the sand basin 2 and the pump well 3 of the rainwater pump station 10 on the water level difference between the sand basin and the pump well is omitted as it is negligible. ..

When the rainwater pump 4 is stopped, the amount of sand basin runoff is determined by the conditions specified at the time of design and construction and the pump well water level rise rate.

Therefore, the amount of runoff from the sand basin can be obtained by acquiring the pump well water level rise rate.

When the rainwater pump 4 is in operation, the amount of sand basin runoff is determined by the conditions specified at the time of design and construction, the pump well water level rise rate, and the amount of pumped water from the rainwater pump 4.

Therefore, if the pumping amount of the rainwater pump 4 in operation and the pump well water level rising speed are acquired, the amount of runoff of the sand basin can be obtained.

Based on these conditions, the pump well water level rise rate when the amount of sand basin runoff exceeds the construction flow rate is set as the first predetermined speed. That is, the first predetermined speed is the speed at which the pump well water level rises when the phenomenon that the pollutant particles do not settle in the sand basin 2 occurs. As shown in equation (4), the rainwater inflow and the pump well water level rise rate are related so that if one is known, the other can be derived. That is, the pump well water level rising speed and the first predetermined speed in the above description can be replaced with the rainwater inflow amount and the corresponding first default flow rate, respectively.

Comparing the pump well water level rise speed acquired in S202 with the first predetermined speed, if the pump well water level rise speed exceeds the first default speed, the sand basin 2 has sufficient capacity to settle and recover pollutant particles. Judging that it does not work, the rainwater pump 4 is started.

If the pump well water level rise speed acquired in S202 is less than or equal to the first default speed, the next step S2
Proceed to 05.

In S205, it is determined whether or not the pump well water level rising speed is lower than the second predetermined speed.

The second predetermined speed is the pump well water level rising speed, which is a reference for whether or not a first flush occurs. As shown in equation (4), the rainwater inflow and the pump well water level rise rate are related so that if one is known, the other can be derived. That is, the pump well water level rising speed and the second predetermined speed in the above description can be replaced with the rainwater inflow amount and the corresponding second default flow rate, respectively.

Whether or not the first flush occurs is related to the bed load in the rainwater pipeline (the force that winds up the sediment and causes it to flow down), so it occurs when there is a certain amount of rainfall in the early stages of rainfall.

Therefore, from the amount of rainwater inflow, that is, the pump well water level rise speed and the operating condition of the rainwater pump,
It is possible to determine whether or not a first flush occurs.

As for this criterion, the operator or the administrator can set an appropriate criterion from the past occurrence history.

Comparing the pump well water level rise speed acquired in S202 with the second default speed, if the pump well water level rise speed is lower than the second default speed, it is judged that the first flush has not occurred and the rainwater pump 4 is started. To do.

When the pump well water level rising speed acquired in S202 is equal to or higher than the second predetermined speed, it is determined that the first flush has occurred, and the rainwater pump 4 is not started.

According to the present embodiment, even if the water level of the pump well 3 exceeds the predetermined water level, the rainwater pump 4 is not started when the pump well water level rising speed is equal to or less than the first predetermined speed and is equal to or higher than the second predetermined speed. When the pump well water level rise speed is higher than the second predetermined speed, a first flush occurs and rainwater containing pollutants flows into the sand basin 2, but the rainwater retention time in the sand basin 2 is not started by starting the rainwater pump 4. It is possible to secure and promote the sedimentation of pollutants, capture and collect them in a sand basin, and prevent them from being discharged into public water areas.

Fig. 3 summarizes the relationship between the amount of rainwater inflow, the water level of the pump well, and the start of the rainwater pump explained in the above operation. ON in FIG. 3 indicates the start of the rainwater pump. As shown in FIG. 3, when the water level of the pump well exceeds the predetermined water level and the rising speed of the pump well water level is equal to or lower than the first predetermined speed and equal to or higher than the second predetermined speed, the operation of the rainwater pump 4 is waited for. By waiting for the operation of the rainwater pump 4, it is possible to improve the recovery efficiency of pollutants in the sand basin 2 and achieve inundation control while preventing the pollutants from flowing out to the river.

(Second embodiment)
The operation of the second embodiment is shown in FIG. The second embodiment is an operation when the rainwater pump 4 in the operating state is stopped or the pumping capacity is suppressed after the rainwater pump 4 is started by the first embodiment.
The control of the rainwater pump 4 in the operating state will be described with reference to FIG.

Since S300 to S302 are the same as S200 to S202 of the first embodiment, the description thereof will be omitted.

Next, in S303, it is determined whether or not the water level of the pump well 3 exceeds the predetermined water level. This default water level is the lowest water level at which the rainwater pump 4 can be operated and the operation is started as in the first embodiment. Depending on the situation, the default water level may be set by the operator or the administrator himself, or may be designed to be variable depending on the rainfall situation. Further, the default water level may be controlled to be automatically changed depending on the rainfall situation.

When the water level of the pump well 3 is lower than the predetermined water level, the rainwater pump 4 is stopped or the output is suppressed.

If the water level of the pump well 3 exceeds the predetermined water level, the process proceeds to the next step S304.

Next, in S304, it is determined whether or not the pump well water level rising speed exceeds the third predetermined speed.

The third predetermined speed corresponds to the speed obtained by subtracting the ascending speed corresponding to the pumping capacity of the rainwater pump from the first predetermined speed in the first embodiment. The pumping capacity of rainwater pumps is often sufficiently large, and if the water level rise is a positive speed, the third default speed is generally a negative speed. Equation (4
), The rainwater inflow and the pump well water level rise rate are in a relationship that, if one is known, the other can be derived. That is, the pump well water level rising speed and the third in the above description.
The default speed can also be replaced with the rainwater inflow and the corresponding third default flow rate, respectively.

Comparing the pump well water level rise speed acquired in S302 with the third predetermined speed, if the pump well water level rise speed exceeds the third default speed, it is judged that the sand basin 2 does not exhibit sufficient capacity, and the rainwater pump Maintain the operating state of 4.

If the pump well water level rise speed acquired in S302 is less than or equal to the third predetermined speed, the next step S3
Proceed to 05.

In S305, it is determined whether or not the pump well water level rising speed is lower than the fourth predetermined speed.

The fourth predetermined speed corresponds to the speed obtained by subtracting the ascending speed corresponding to the pumping capacity of the rainwater pump from the second predetermined speed in the first embodiment. The pumping capacity of a rainwater pump is often sufficiently large, and if the water level rise is a positive speed, the fourth predetermined speed is generally a negative speed. Equation (4
), The rainwater inflow and the pump well water level rise rate are in a relationship that, if one is known, the other can be derived. That is, the pump well water level rising speed and the fourth in the above description.
The default speed can be replaced with the rainwater inflow and the corresponding fourth default flow rate, respectively.

Comparing the pump well water level rise speed acquired in S302 with the 4th default speed, if the pump well water level rise speed is lower than the 4th default speed, it is judged that the first flush has not occurred, and the rainwater pump 4 is operated. Maintain the state.

When the pump well water level rising speed acquired by S302 is equal to or higher than the fourth predetermined speed, it is determined that the first flush has occurred, and the rainwater pump 4 is stopped or the output is suppressed.

According to the present embodiment, when the rainwater pump 4 is operated, the water level of the pump well 3 exceeds the predetermined water level, the pump well water level rise speed is equal to or less than the third predetermined flow rate, and is equal to or higher than the fourth predetermined flow rate. Occasionally, control is performed to stop or suppress the output of the rainwater pump 4.

The rainwater pump start control of S200 to S206 of FIG. 2 is repeatedly executed at predetermined time intervals.

When the rainwater pump is started in S207 of FIG. 2, the rainwater pump stop control after S300 of FIG. 4 is executed.

The rainwater pump stop control of S300 to S307 is repeatedly executed at predetermined time intervals.

FIG. 5 summarizes the relationship between the rainwater inflow amount, the water level of the pump well, and the stop / output suppression of the rainwater pump described in the above operation. Off in FIG. 5 indicates the stop / output suppression of the rainwater pump. As shown in FIG. 5, when the water level of the pump well exceeds the predetermined water level and the pump well water level rising speed is equal to or lower than the first predetermined speed and equal to or higher than the second predetermined speed, the rainwater pump 4 is stopped. By stopping the rainwater pump 4, it is possible to improve the recovery efficiency of pollutants in the sand basin 2 and prevent the pollutants from flowing out to the river, while giving consideration to inundation control.

(Third Embodiment)
The rainwater pump control device of the third embodiment is shown in FIG. Rainwater pump station 1 shown in FIG.
0 includes an inflow culvert 1, a sand basin 2, a pump well 3, a rainwater pump 4, a pump well water level gauge 5, an inflow culvert water level gauge 6, and a rainwater pump control device 100. Since it is the same as the inflow culvert 1, the sand basin 2, the pump well 3, the rainwater pump 4, the pump well water level meter 5, and the first embodiment, the description thereof will be omitted. The inflow culvert water level meter 6 is installed in the inflow culvert 1 and measures the water level of the inflow culvert 1. Since the rainwater treatment process in FIG. 6 is the same as that of the first embodiment, the description thereof will be omitted.

The difference from the first embodiment is a means for acquiring the pump well water level upper layer velocity in the rainwater inflow acquisition unit 101. In the first embodiment, the pump well water level rising speed was derived and acquired from the pump well water level gauge 5, but in the third embodiment, instead of this, the inflow culvert water level gauge 6 installed in the inflow culvert 1 was obtained. Obtained from the inflow culvert water level rise rate. Since the pump well water level gauge is more suitable for the operation control of the rainwater pump than the inflow culvert water level gauge, it is used as an alternative means when the pump well water level gauge is abnormal, or used instead of the pump well water level rise speed in the formula (5). It is expected that it will be used to improve accuracy.

Further, the amount of rainwater inflow may be predicted by using a weather radar such as an MP radar or a rainfall observer such as a ground rain gauge.

Further, the water level may be acquired from a sensor such as a water level gauge installed in the sewer pipe to predict the inflow amount of rainwater flowing into the sand basin 2. A known method may be used for predicting the inflow of rainwater into the sand basin 2.

Based on these predicted or measured rainwater inflows, the pump well water level rise rate can be derived from Eq. (4).

The difference between the third embodiment and the first and second embodiments is that instead of deriving the ascending velocity from the pump well water level, the ascending velocity is derived from the inflow culvert water level, or from the rainwater inflow amount directly measured or predicted. It is at the point of guiding the pump well water level rise rate. Regarding the operation, the first and second
Since it is the same as that of the embodiment, the description thereof will be omitted.

As shown in equation (4), the rainwater inflow and the pump well water level rise rate are related so that if one is known, the other can be derived. That is, the expressions of the pump well water level rising speed and each predetermined speed in the above description can be replaced with the rainwater inflow amount and the corresponding predetermined flow rate, respectively.

The claims use the representation of the default flow rate, but do not constrain the use of the default velocity.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 Inflow culvert 2 Settling basin 3 Pump well 4 Rainwater pump 5 Pump well water level gauge 6 Inflow culvert water level gauge 100 Rainwater pump control device

Claims (20)

The water level of the pump well that stores the rainwater flowing in from the sand basin exceeds the specified water level,
And when the amount of rainwater flowing into the sand basin exceeds the first predetermined flow rate,
A rainwater pump control device that pumps the rainwater stored in the pump well and activates a rainwater pump that discharges the rainwater to a public water area. The water level of the pump well that stores the rainwater flowing in from the sand basin exceeds the specified water level,
And when the amount of rainwater flowing into the sand basin falls below the second predetermined flow rate,
A rainwater pump control device that pumps the rainwater stored in the pump well and activates a rainwater pump that discharges the rainwater to a public water area. The rainwater pump control device is
When the water level of the pump well exceeds the predetermined water level and the rainwater inflow exceeds the first predetermined flow rate, and when the rainwater inflow falls below the second predetermined flow rate.
The rainwater pump control device according to claim 2, wherein the rainwater pump is started. The water level of the pump well that stores the rainwater flowing in from the sand basin exceeds the specified water level,
And when the amount of rainwater flowing into the sand basin is less than or equal to the third predetermined flow rate,
A rainwater pump control device that pumps the rainwater stored in the pump well and stops or suppresses the output of the rainwater pump that discharges it to a public water area. The water level of the pump well that stores the rainwater flowing in from the sand basin exceeds the specified water level,
And when the amount of rainwater flowing into the sand basin is equal to or greater than the fourth predetermined flow rate,
A rainwater pump control device that pumps the rainwater stored in the pump well and stops or suppresses the output of the rainwater pump that discharges it to a public water area. The rainwater pump control device is
When the water level of the pump well exceeds the predetermined water level and the inflow of rainwater is equal to or less than the third predetermined flow rate, and when the inflow of rainwater is equal to or greater than the fourth predetermined flow rate.
The rainwater pump control device according to claim 5, wherein the rainwater pump is stopped or the output is suppressed. The first predetermined flow rate is a flow rate at which a phenomenon occurs in which particles of pollutants do not settle in the sand basin.
The rainwater pump control device according to claim 1 or 3. The second predetermined flow rate is a flow rate that serves as a reference for whether or not a first flush occurs.
The rainwater pump control device according to claim 2 or 3. The third predetermined flow rate is a speed obtained by subtracting the ascending speed corresponding to the pumping capacity of the rainwater pump from the first predetermined flow rate.
The rainwater pump control device according to claim 4 or 6. The fourth predetermined flow rate is a speed obtained by subtracting the ascending speed corresponding to the pumping capacity of the rainwater pump from the second predetermined flow rate.
The rainwater pump control device according to claim 5 or 6. The rainwater pump control device according to any one of claims 1 to 10, wherein the rainwater inflow amount is obtained from the amount of change in the water level of the pump well over a predetermined time. The step of acquiring the water level of the pump well that stores rainwater and drains the stored rainwater with a rainwater pump,
Steps to obtain the amount of rainwater inflow into the sand basin where rainwater flows in, and
The acquired water level exceeds the default water level, and
A rainwater pump control method comprising a step of starting the rainwater pump when the acquired rainwater inflow amount exceeds the first predetermined flow rate. The step of acquiring the water level of the pump well that stores rainwater and drains the stored rainwater with a rainwater pump,
Steps to obtain the amount of rainwater inflow into the sand basin where rainwater flows in, and
The acquired water level exceeds the default water level, and
A rainwater pump control method comprising a step of starting the rainwater pump when the acquired rainwater inflow amount is less than the second predetermined flow rate. The step of acquiring the water level of the pump well that stores rainwater and drains the stored rainwater with a rainwater pump,
Steps to obtain the amount of rainwater inflow into the sand basin where rainwater flows in, and
The acquired water level exceeds the default water level, and
A rainwater pump control method comprising a step of stopping or suppressing the output of the rainwater pump when the acquired amount of the rainwater inflow is equal to or less than a third predetermined flow rate. The step of acquiring the water level of the pump well that stores rainwater and drains the stored rainwater with a rainwater pump,
Steps to obtain the amount of rainwater inflow into the sand basin where rainwater flows in, and
The acquired water level exceeds the default water level, and
A rainwater pump control method comprising a step of stopping or suppressing an output of the rainwater pump when the amount of rainwater inflow is equal to or greater than a fourth predetermined flow rate. For rainwater pump control device,
A function to acquire the water level of a pump well that stores rainwater and drains the stored rainwater with a rainwater pump,
A function to acquire the amount of rainwater inflow into the sand basin where rainwater flows in, and
The acquired water level exceeds the default water level, and
A function to start the rainwater pump when the acquired rainwater inflow exceeds the first predetermined flow rate, and
A computer program to realize. For rainwater pump control device,
A function to acquire the water level of a pump well that stores rainwater and drains the stored rainwater with a rainwater pump,
A function to acquire the amount of rainwater inflow into the sand basin where rainwater flows in, and
The acquired water level exceeds the default water level, and
The function to start the rainwater pump when the acquired rainwater inflow rate is less than the second predetermined flow rate, and
A computer program to realize. For rainwater pump control device,
A function to acquire the water level of a pump well that stores rainwater and drains the stored rainwater with a rainwater pump,
A function to acquire the amount of rainwater inflow into the sand basin where rainwater flows in, and
The acquired water level exceeds the default water level, and
A function to stop or suppress the output of the rainwater pump when the acquired inflow of rainwater is equal to or higher than the third predetermined flow rate.
A computer program to realize. For rainwater pump control device,
A function to acquire the water level of a pump well that stores rainwater and drains the stored rainwater with a rainwater pump,
A function to acquire the amount of rainwater inflow into the sand basin where rainwater flows in, and
The acquired water level exceeds the default water level, and
When the acquired rainwater inflow exceeds the fourth predetermined flow rate, the rainwater pump is stopped or the output is suppressed.
A computer program to realize. A rainwater wastewater treatment system including a sand basin, a pump well, a rainwater pump, and a rainwater pump control device.
The rainwater pump control device is
When the water level of the pump well exceeds the predetermined water level and the amount of rainwater flowing into the sand basin exceeds the first predetermined flow rate.
Alternatively, when the water level of the pump well exceeds the predetermined water level and the amount of rainwater flowing into the sand basin is lower than the second predetermined flow rate.
Start the rainwater pump and
When the water level of the pump well exceeds the predetermined water level, the amount of rainwater flowing into the sand basin is equal to or less than the third predetermined flow rate, and the amount of rainwater flowing into the sand basin is equal to or greater than the fourth predetermined flow rate.
The rainwater pump is stopped or the output is suppressed.
Rainwater wastewater treatment system.

Images