KR20210098670A - Storm-water reservoir for flood control - Google Patents

Abstract

The present invention relates to a rainwater detention basin for flooding prevention. According to the present invention, a water level measurer for checking a flooding depth is installed in a frequent flooding area, and a sluice and a pump operated in interconnection with the same are used to lead rainwater into a rainwater detention basin, and, as a result, a water flowrate of a section with a lack of a cross-sectional area of flow is always kept constant to prevent flooding. The rainwater detention basin for flooding prevention includes: a water measurer installed in a water measurer installation section of a flooding area which is a section with a section of a rainwater duct with a lack of a cross-sectional area of flow; an inflow sluice installed at an inlet end of the rainwater detention basin to be opened and closed such that rainwater flows into the rainwater detention basin when the rainwater flowing in the rainwater duct is no less than a planned flood amount determined by the water measurer; a rainwater discharge sluice opened and closed to discharge the rainwater to a rainwater discharge duct of the rainwater detention basin; a rainwater pump installed to discharge the rainwater in the rainwater detention basin to the outside; and a sewage pump installed to discharge sewage. Therefore, in case of arrival at a preset flood depth, the inflow sluice is automatically or manually opened to store the rainwater in the rainwater detention basin, and, as a result, a water flowrate in a section with a lack of a cross-sectional area of flow is reduced to prevent flooding.

Description

Storm-water reservoir for flood control}

The present invention relates to a flood prevention rainwater control site, in particular, by installing a water level meter to check the depth of flooding in a habitually flooded area, and allowing rainwater to flow into and out of the stormwater control area using a sluice gate and a pump operated in connection with this, It relates to a flood prevention stormwater control site that can prevent flooding by always maintaining a constant water flow rate in the insufficient section.

Floods, usually associated with typhoons, occur as a result of short-term torrential rains or long-lasting precipitation. Floods are very destructive natural disasters that not only destroy roads and buildings, but also isolate people. In particular, in cities with various underground facilities, roads, and buildings, running rainwater does not naturally permeate into the ground and flows down, inundating parking lots or basements or turning low-lying areas into a sea of water. The low-lying areas of the city are also severely damaged by short-term heavy rains. What is most needed to prevent such flood damage is a rainwater storage facility that temporarily stores rainwater and discharges it to Cheongcheon, which is currently being implemented in many areas.

As a facility to offset the increase in rainwater runoff due to development, for example, precipitation falling on schools, parks, public parking lots, playgrounds, large distribution business facilities, etc. is stored in 'on-site' storage, There is an 'off-site' storage facility that collects rain and stores it in one place as a facility to reduce the amount of excess rainwater runoff occurring at this time.

These stormwater control areas (rainwater storage tanks) have increased rainwater runoff due to the rainy season and heavy rain. Most of the flood prevention facilities store the amount of water temporarily, adjust the flow rate, and then send it out to the sewage pipe. It is a reservoir installed to prevent the operation of the drain pump from being intercepted when the flood collection time is slow in the drainage and the inflow of the necessary water for pumping from the drainage canal connected to the drainage pumping station is not sufficient. I play a role in regulating things. A consideration in the design of the reservoir should be a natural flow drainage method, and it should be installed where the drainage capacity of the sewer pipe is insufficient, the capacity of the drainage pump in the downstream area is insufficient, and the drainage capacity of the discharge channel is insufficient. There are various types of reservoirs, such as a dam type that makes a reservoir with an earthen dam or a concrete dam, an excavation type that is made by excavating flat land, and an underground type that constructs a reservoir through an underground pipeline and storage tank.

1 is an explanatory diagram showing the installation location of a typical stormwater control pond, and FIG. 2 is an inflow/outflow hydrograph showing temporal changes in river flow due to outflow in an arbitrary cross-section (point). As the components of the hydrologic curve, it is interpreted as peak flow, peak time, lag time, arrival time, base time, inflection point, inflection point of the meiosis curve, etc. In this drawing, reference numeral 100 denotes a drainage area, 200 denotes a stormwater control area or an area where a stormwater control site is installed, 210 denotes a flooded area, 220 denotes a section lacking water flow area, Q denotes water flow, and T denotes time.

The pipe diameter of general sewage pipelines in Korea is determined based on the rainfall intensity of about '75mm/hr' for 10 years for trunk lines and 5 years for branch lines. However, as the rainfall has recently fallen to around 100mm/hr and the size of the sewer pipe has been strengthened to 30 years for trunk lines and 10 years for branch lines, there have been many sections that lack the passage area of existing sewage pipes, causing flooding in the upstream area. In order to prevent this, the large-scale construction cost and the occurrence of accidents such as flooding during construction are sufficiently expected when the sewage pipe with insufficient flow area is expanded.

In order to prevent flood damage, when a sewage conduit with insufficient flow area is expanded, construction costs are expected to increase, safety accidents occur during construction, and increase in civil complaints are expected. When it rains more than the above, rainwater is temporarily stored and the flow rate is appropriately adjusted to prevent flood damage.

Urban areas are densely populated with people and buildings, and the potential risk for human life and property damage in the event of a flood is very high. The degree of flood damage in urban areas largely depends on the depth of flooding. When the depth of flooding is shallow, it flows into basements and empty spaces and causes damage. As the depth of flooding increases, damage to electrical facilities, electronic products, kitchen facilities, furniture, personal items, etc. as well as structural damage increases significantly. Therefore, in order to prevent and mitigate flood damage, it is necessary to analyze how much inundation occurs in which area.

For example, in a representative city in Korea, as urbanization progresses, the amount of runoff during rainfall increases, shortening the time to reach the flood, and the incidence of concentrated rainfall due to extreme weather is increasing, increasing the risk of flood damage. Flooding damage occurred frequently around riversides and lowlands due to major floods in the past 20 years, and the main cause of flooding was sudden concentrated rainfall exceeding the stormwater exclusion maintenance level. If rainwater runoff increased due to concentrated rainfall, rainwater could not be smoothly excluded at the bottleneck point of the sewage pipe in the low-lying area, and it was delayed, causing flood damage to nearby areas.

Increasing the capacity of stormwater drainage facilities to reduce flood damage is the most active and reliable method as long as the water passing capacity of the discharging stream is sufficient. It is highly likely to become uneconomical, and the flow of the river cannot be secured because the area around the river is developed with high density.

On the other hand, the installation of rainwater storage facilities in the city can be applied appropriately to urban watersheds that have already been developed, as it allows to cope with rainfall that exceeds the exclusion capacity of the region while maintaining the existing rainwater drainage facilities. can

As another problem, most of the rainwater penetrated into the ground before urbanization, but the current surface is paved with an impervious surface such as asphalt. There is a problem of inflow and causing flood damage. The impervious area ratio out of the total area of 605.5 km ² of this metropolis was only 7.8% in 1962, but increased to 47.1% in 2001. Forest occupies 25.4% of the city's area, and most of them are located in outlying areas, so the urbanized area is virtually impervious to water. is a demand

Recently, when the hourly rainfall (rainfall that falls for one hour; usually 75 mm/hr) falls more than the original conduit design standard amount of 75 mm/hr, such as guerrilla heavy rain, the conduit scale is insufficient and the water flow capacity is insufficient. ), causing flooding. In this case, in consideration of the fact that the section with insufficient conduit water flow is a city section or a road with a large amount of traffic, and a lot of complaints occur, a storm water control pond (reservoir) is installed upstream of the section lacking conduit. If we look at the damage caused by rainfall in Korea recently, a few years ago, the amount of rainfall that fell once in Yeoncheon district, Gyeonggi-do was about 500 mm, which caused enormous property damage. Heavy rains caused about 7 trillion won in damage.

The amount of water flowing in from the conduit to the stormwater control area must be sent quantitatively and temporally, but artificially judged and flowed into the reservoir through sluice manipulation, etc. do. This may cause artificial flooding damage due to the inflow of rainwater after flooding.

The pipe diameter to be determined when installing a general sewage pipe is based on rainfall intensity (rainfall) of 75mm/hr, 10 years for trunk lines, and 5 years for branch lines. Recently, the rainfall is around 100mm/hr, so the flow capacity of the rainwater pipe diameter is insufficient.

This is a phenomenon that occurs because the size of the sewer pipe to drain it is greatly insufficient because it falls more than the original conduit design standard amount of about 75mm/hr, that is, the discharge capacity of the waterway at a given slope. As a measure to indicate, the larger the channel cross-section and the smaller the roughness coefficient, the larger the value).

Most of the inflow facilities in Korea are the weir method (water overflow facility), which is a natural distribution of inflow, and the sluice method, which is an artificial distribution of inflow. The weir method is installed in a conduit with a free water surface, and since water flow must be considered when designing the sewer pipe, it is difficult to design the weir such as length and height. This is narrow and difficult.

Although the sluice method is a quantitative method rather than the weir method, if the time of opening and closing the sluice gate is artificially performed when the sluice gate is installed, rainwater fills the stormwater control pond first. In some cases, anthropogenic accidents occur due to water retention after flooding. For example, in areas such as Cheongju, the cause of flooding in the area where the storm water control area is installed is considered to be caused by insufficient storage tank capacity because the time of opening and closing of the sluice gate is too early. A common problem with these two methods is that the distribution of inflows is poor.

3 is an explanatory diagram for explaining a situation in which sediment is generated in the rainwater control area. Rainwater introduced into the rainwater control area 200 should be excluded as soon as possible. Since rainfall frequently comes during the monsoon season (during the rainy season), it is necessary to prepare for continuous rainfall by emptying the rainwater control area 200 . However, the current water exclusion of the stormwater control area 200 usually implements water exclusion after the end of the rain, so there are many problems in the case of continuous rainfall, in which the rainfall is not received and flooding occurs. As time passes, the concentration of the sediment 240 increases and is excluded together with the sediment 240, and also serves as a problem that civil complaints occur due to turbidity of water due to suspended substances in water. Unexplained reference numeral 250 denotes a rainwater pump for draining water in the rainwater conditioning pond 200, and 260 denotes a rainwater drainage pipe connected to the rainwater pump 250 and a general sewage pipe.

As described above, the present invention proposes the following solutions for efficient installation in consideration of the problems of the rainwater control area.

In order to prevent flooding, a stormwater control pond connected to a stormwater pipe (joint type sewage pipe) to temporarily store rainwater, an inflow connection pipe for introducing rainwater from the stormwater pipe to the stormwater control area, and discharge rainwater stored in the stormwater control area In a typical stormwater management site comprising a stormwater discharge pipe for

When it is determined that rainwater flows beyond the pre-set submersion depth by the water level meter installed in the installation section of the water level meter in the flooded area, which is the section where the passage area of the storm water pipe is insufficient, and the water level meter in the storm water pipe, the storm water control area An inflow sluice installed at the inlet end of the stormwater control pond to open and shield the stormwater treatment area, a stormwater discharge sluice gate that opens and shields to discharge rainwater into the stormwater discharge pipe of the stormwater management area, and It is made with a rainwater pump installed to discharge to the outside and a sewage pump installed to discharge sewage water.

In addition to this configuration, it is recommended that the water level gauge install a water level gauge in the case of a free water conduit and a pressure gauge in the case of a pressure conduit to check the water level in the rainwater pipe, and the inlet sluice gate and stormwater pump are located in the submerged area. It is preferable that communication is controlled according to the judgment value of the installed water level meter, or the sewage pump and the sewage discharge sluice gate are controlled by communication according to the control of a central management system of the sewage treatment plant.

In addition, the water level meter continues to measure the water level while rainwater flows into the stormwater control area, and when the water level falls below the submersion depth, the rainwater pump is operated and the stormwater discharge sluice gate is opened to exclude rainwater; Preferably, the sewage pump and the sewage discharge sluice gate are controlled by communication by the control of a central management system of the sewage treatment plant when there is a surplus in the treatment capacity of the sewage treatment plant.

The flood prevention excellent control paper of the present invention has the following effects.

1. Since a water level gauge that can predict flooding is installed in the conduit in the area where the water flow area of the rainwater pipe is insufficient, which is a section with insufficient flow area, automatically or manually open the inflow sluice gate when the pre-set flooding depth is reached. Because rainwater is stored in the control area, it prevents flooding by reducing the amount of water flow in the section where the passage area is insufficient.

2. Install a water level gauge or a water pressure gauge in the conduit to predict flooding in the area where flooding is expected, which is a section where the passage area of the storm water pipe is insufficient. Since the sewage discharge sluice gate is opened, the storm water control field is emptied so that the capacity of the storm water control field can be secured quickly in order to prepare for another rainfall. prevent.

3. Since the sewage pump and the sewage discharge sluice gate are installed in the stormwater treatment area, sediment and fresh water in the stormwater treatment area are discharged in connection with the sewage treatment plant, thereby greatly reducing the pollution of the discharged river.

1 is an explanatory view showing the installation position of a normal rainwater adjustment ground;
2 is an inflow/outflow hydrologic curve showing the temporal change of river flow due to outflow in an arbitrary cross-section (point);
3 is an explanatory diagram for explaining the situation in which sediment is generated in the flood prevention stormwater control site;
4 is an explanatory view for explaining the installation section of the water level meter, which is the main means of the flood prevention rainwater control area of the present invention;
5 is a cross-sectional explanatory view showing the installation state of the water level gauge when the storm water pipe of the flood prevention storm water control area of the present invention is a free water conduit;
6 is a cross-sectional explanatory view showing the installation state of the pressure gauge when the rainwater pipe of the flood prevention rainwater control area of the present invention is a pressure pipe;
7 is a plan explanatory view for explaining the setting of the flooding depth and the inflow sluice gate opening and closing time of the flood prevention rainwater control area according to the present invention;
8 is a system diagram showing the main facilities of the flood prevention rainwater control area of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described in detail with respect to the flooding prevention rainwater regulating ground of the present invention of the present invention. 4 is an explanatory view for explaining the installation section of the water level meter, which is the main means of the flood prevention rainwater control area of the present invention. The key to the present invention is to install a water level meter in the rainwater passage that is flooded the fastest in order to quickly recognize that the habitually flooded area is flooded. 5 is a cross-sectional explanatory view showing the installation state of the water level gauge in the case of a free-water conduit, and FIG. 6 is a cross-sectional explanatory diagram illustrating the installation state of the pressure gauge in the case of a pressure conduit.

As shown in these drawings, in the rainwater pipe (sewage pipe; 10), a water level gauge 12 or a pressure gauge 14 is installed in the water level meter installation section (C) of the submerged area (A) section. The water level measuring device 11 is installed in the pipeline in the section (flooded area; A) where flooding occurs due to insufficient area of passage to allow inflow into the flood prevention rainwater control area 20 before flooding occurs. Pipeline Flow (管水路, Pipeline Flow) is a flow that flows by pressure (difference) because the pipe is filled with fluid. There is no free water surface because it always flows in a full water state, and it is called a pressure type or pump pressure feeding type. On the other hand, a flow in which a part of the fluid interface has a free surface such as natural rivers, sewage, and rainwater conduits and the flow characteristics in contact with the atmosphere are governed by gravity is called an open channel flow. A flow with a free surface is defined as an open channel flow, even if it is a flow in a conduit-shaped channel, such as a flow in a sewer pipe or a culvert. Such a water level meter detects the water level by installing a water level gauge 12 in the case of a free water conduit and installing a pressure gauge 14 in the case of a pressure conduit. Unexplained symbol h indicates the height between the ground line and the water level (HWL).

5 and 6 are plan views for explaining the setting of the submersion depth of the flood prevention rainwater control area according to the present invention. In general, between sidewalks and roads of different heights, a gutter is installed at the end of the road or at the boundary between the sidewalk and the road to drain the road surface, and the water collected through this gutter is collected in a water collecting tank and flows into the sewer pipe.

Here, the general immersion depth (h) is set as follows.

h = loss head of the connecting pipe + head inflow of the sump + other factors (α) ≒ 50cm or more.

7 is a plan explanatory view for explaining the setting of the flooding depth and the inflow sluice gate opening and closing time of the flood prevention rainwater control area according to the present invention. Symbol L(t) is the distance between the installation point of the water level meter (11: 12, 14) on the storm water pipe 10, which is a sewage pipe, and the inflow point near the inflow sluice gate 22 of the storm water control area 20, t is the arrival of storm water indicates time. Therefore, the submersion depth is set in consideration of the distance between the installation point of the water level meter and the inflow point of the stormwater control area 20 and referring to the arrival time of rainwater.

8 is a facility schematic diagram showing the main facilities of the flood prevention storm water control area of the present invention. In the normal rainwater pipe 10, there is a section (B) that lacks the passage area, and a flooded area (A) occurs here. A water level gauge 12 or a pressure gauge 14 is installed in any one section of the submerged area (A) to determine the amount of water flow. That is, the water level gauge 12 is installed in the rainwater pipe 10 of the flow maintaining the free water surface, and the pressure gauge 14 (or a water pressure gauge is also possible) is installed in the rainwater pipe 10 in the flow of the pressure pipe.

The rainwater conditioning pond 20 is connected to the stormwater pipe 10 through an inflow connecting pipe 24 having an inflow sluice gate 22 at the inlet end of the stormwater conditioning basin 20 . In the stormwater conditioning pond 20, a stormwater pump 23 for discharging stored rainwater to the stormwater pipe 10 through the stormwater discharge pipe 16 and the stormwater discharge sluice gate 18, and the sewage discharge pipe 26 ) and a sewage pump 25 for discharging the sewage to the sewage pipe 30 side through the sewage discharge sluice gate 28 are installed. A conventional sewage treatment plant 40 is disposed at the end of the sewage pipe 30 .

The inflow connection pipe 24 is a pipe connecting the storm water pipe 10 and the storm water control area 20. When flooding is expected in the downstream area, when rainwater is introduced from the storm water pipe 10 to the storm water control area 20 used An inflow sluice gate 22 is installed at the end of this inlet connection pipe 24, that is, the inlet of the stormwater control pond 20, and is turned on and off depending on whether the downstream area is flooded and receives rainwater toward the stormwater control area 20. or block

As described above, the rainwater control site 20 is a facility that partially stores rainwater in order to prevent flooding due to insufficient flow area of the conduit facilities in the downstream area, and temporarily stores and discharges rainwater greater than the planned flood amount. A rainwater pump 23 for discharging rainwater to the outside after completing the function of temporarily storing rainwater to prevent flooding in the case of intense rain is installed in the rainwater control area 20 . A sewage pump 25 for discharging to the sewage treatment plant 40 is installed in order to prevent the deterioration of the river water quality due to sediment contamination or floor cleaning of the rainwater tank 20 tank. The rainwater discharge pipe 16 is used to discharge rainwater to the rainwater pipe 10 side, and the sewage discharge pipe 26 is a pipe used to transport sewage generated in the treatment area to the sewage treatment plant 40 and is classified In the case of a type sewage pipe, it means a sewage pipe, and in the case of a combined sewage pipe, it means a collecting pipe.

In FIG. 8, reference numeral 17 denotes a communication line, which opens or blocks the inflow sluice gate 22 or stormwater discharge sluice gate 18 according to the judgment value obtained from the water level gauge 12 or the pressure gauge 14, and completes the flood prevention function. Then, when the rainwater is discharged, the rainwater pump 23 is operated to discharge the rainwater in the rainwater control pond 20 . Also, as a communication line 44, the sewage discharge sluice gate 28 or the sewage pump 25 is operated under the control of the central management system 42 of the sewage treatment plant 40 to discharge sewage through the sewage discharge pipe 26. It is sent to the treatment plant (40).

Next, the measurement of the submersion depth of the flood prevention rainwater control paper of the present invention will be described. As described above, the depth of submersion is measured in real time by using a water level meter such as a water level gauge 12 or a pressure gauge 14 installed in the section (B) with insufficient passage area of the typical storm water pipe 10 . For example, when the water level rises above the preset submersion depth, the inflow sluice gate 22 is opened and rainwater is stored in the rainwater control pond 20 to maintain the preset submersion depth and habitual occurrence of the short passage area section (B). Prevent flooding in the flooded area (A).

The water level measurement continues while rainwater flows into the stormwater control area 20, and when the water level falls below the submersion depth, the rainwater pump 23 is operated and the stormwater discharge sluice gate 18 is opened to exclude rainwater. . The reason for quickly excluding the rainwater from the stormwater control area 20 is to prepare for the next rainfall because the recent rainfall shows the form of continuous rainfall. This is because the recent rainwater control pond 20 cannot be excluded, and there is no additional storage space, so it becomes a form that causes flooding.

On the other hand, the rainwater stored in the rainwater control pond 20 accumulates on the floor as sludge due to sedimentation over time. Since the polluted water generated while removing the sediment of the stormwater treatment plant 20 must be treated and discharged at the sewage treatment plant, it can be discharged when there is room in the treatment capacity of the sewage treatment plant. Accordingly, when there is room in the treatment capacity of the sewage treatment plant, the sewage pump 25 is operated, the sewage discharge sluice gate 28 is opened, and the sewage water is discharged to the sewage treatment plant 40 through the sewage pipe 30 .

The stormwater control pond (reservoir) of the present invention installs a water level gauge or water pressure gauge (pressure gauge) that can predict flooding in the flooded area in the conduit and, when the preset depth of submersion is reached, opens the inflow sluice gate to collect rainwater to the stormwater control area. It is stored below the submersion depth to prevent flooding.

In addition, if rainwater is stored in the stormwater control area, the stormwater control area should be emptied quickly so that the capacity of the stormwater control area can be secured quickly in order to prepare for another rainfall. After the rain starts and the rainwater is stored in the stormwater control area, the water level meter (water level gauge or water pressure gauge) installed in the conduit falls below the submersion depth and the rainfall becomes weak, close the inflow sluice gate and operate the discharge pump and discharge sluice gate to collect rainwater stored in the stormwater control area. expel quickly When the rain starts, the various devices are repeatedly operated.

After the rain ends, sediment and fresh water in the stormwater treatment plant are discharged after treatment at the sewage treatment plant in connection with the sewage treatment plant. If the additional treatment capacity of the sewage treatment plant is possible, the sewage pump and sluice gate are operated and sent to the sewage treatment plant.

As described above, the present invention has been described with reference to the drawings exemplified for the flood prevention rainwater control site according to the present invention, but the present invention is not limited by the embodiments and drawings disclosed in this specification, and within the scope of the technical idea of the present invention Of course, various modifications may be made by those skilled in the art.

10: rainwater pipe (sewage pipe) 12: water level gauge
14: pressure gauge 16: rainwater discharge pipe
17, 44: Communication line 18: Rainwater discharge sluice gate
20: rainwater control area 22: inflow sluice gate
23: storm pump 24: inlet connector
25: sewage pump 26: sewage discharge pipe
28: sewage discharge sluice gate 30: sewage pipe
40: sewage treatment plant 42: central management system
44: communication line A: flooded area
B: Section with insufficient flow area
C: Water level meter installation section

Claims (6)

In order to prevent flooding, it is connected to a rainwater pipe (sewage pipe; 10) to temporarily store rainwater, and the rainwater from the rainwater pipe (10) is connected to an inflow connection pipe (20) 24), a rainwater discharge pipe 16 for discharging the rainwater stored in the stormwater treatment area 20, and a sewage discharge pipe 26 for transferring the sewage generated in the stormwater treatment area 20 to the sewage treatment plant 40. In a conventional rainwater control area comprising:
A water level meter 11 installed in the water level meter installation section (C) of the flooded area (A), which is a section (B) where the passage area of the rainwater pipe (10) is insufficient;
When it is determined by the water level meter 11 that rainwater flows into the stormwater pipe 10 beyond the preset immersion depth, it is installed at the inlet end of the stormwater conditioning basin 20 so that the rainwater flows into the rainwater conditioning basin 20 . an inflow sluice gate 22 that opens and closes,
A rainwater discharge sluice gate 18 that opens and closes operation to discharge rainwater to the rainwater discharge pipe 16 of the rainwater control pond 20;
Flooding prevention stormwater control paper, characterized in that it comprises a rainwater pump (23) installed to discharge rainwater to the outside in the rainwater control pond (20), and a sewage pump (25) installed to discharge sewage water. The method according to claim 1, wherein the water level meter (11), a water level gauge (12) in the case of a free water conduit, and a pressure gauge (14) in the case of a pressure conduit to check the water level in the rainwater pipe (10) Flood prevention excellent control paper. The flood prevention rainwater control paper according to claim 1, wherein the inflow sluice gate (22) and the rainwater pump (23) are communication-controlled according to the judgment value of the water level meter (11) installed in the flooded area (A). [Claim 2] The flood prevention stormwater control site according to claim 1, wherein the sewage pump (25) and the sewage discharge sluice gate (28) are controlled by communication according to the control of a central management system (42) of the sewage treatment plant (40). The method according to claim 1 or claim 3, wherein the water level meter (11) continues to measure the water level while rainwater flows into the rainwater control pond (20), and when the water level falls below the submersion depth, the rainwater pump (23) ) and open the rainwater discharge sluice gate 18 to exclude rainwater. The method according to claim 1 or 4, wherein the sewage pump (25) and the sewage discharge sluice gate (28) communicate under the control of the central management system (42) of the sewage treatment plant (40) when there is a surplus in the treatment capacity of the sewage treatment plant Flood prevention rainwater control paper, characterized in that it is controlled.

Images