CN113376077A - On-site actual measurement device and method for evaluating performance of biological retention facility sponge - Google Patents
On-site actual measurement device and method for evaluating performance of biological retention facility sponge Download PDFInfo
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- CN113376077A CN113376077A CN202110928051.0A CN202110928051A CN113376077A CN 113376077 A CN113376077 A CN 113376077A CN 202110928051 A CN202110928051 A CN 202110928051A CN 113376077 A CN113376077 A CN 113376077A
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- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
Abstract
The invention discloses a sponge performance evaluation device for a bioretention facility, which is actually measured on site and comprises a heightening plugging device, a simulated rainwater conveying system, a detachable overflow box and an integrated drainage collection metering device; the heightening and plugging device is used for surrounding, blocking and heightening the periphery of an overflow well in the bioretention facility; the simulated rainwater conveying system is used for carrying out quantitative water conveying on the bioretention facilities; the detachable overflow box is arranged on one side of an overflow well in the biological retention facility and is used for metering overflow flow; the integrated drainage collecting and metering device is used for extending into the overflow well to collect the drainage pipe and metering the water outlet flow; and an evaluation method is also provided, and the overflow flow and the effluent flow are actually measured on site and are calculated and evaluated. The device is simple and convenient, is simple to operate, can be popularized in a large scale, and can objectively and truly evaluate the operation processing capacity of the bioretention facility on site.
Description
Technical Field
The invention relates to the field of performance evaluation of sponge facilities, in particular to a device and a method for evaluating the performance of a bioretention facility sponge measured on site.
Background
At present, the sponge city is the urban rainfall flood management concept of new generation, and it follows ecological principle such as priority, combines together natural way and artificial measures, under the prerequisite of ensureing urban drainage flood control safety, furthest realizes that the rainwater stores up, permeates and purifies in urban area, promotes the utilization and the ecological environment protection of rainwater resource. The construction of the sponge city is not a basis for replacing the traditional drainage system, but a 'load reduction' and supplement of the traditional drainage system are realized, the self effect of the city is exerted to the maximum extent, and the water is absorbed, stored, seeped and purified when raining, and the stored water is 'released' and utilized when needed.
The biological detention facility is a facility which is arranged in a lower region of the terrain, accumulates, seeps and purifies runoff rainwater through a plant, soil and microorganism system, and is a key technology in sponge city construction. The research on the bioretention facility in China starts late, and the bioretention facility is used as a common sponge facility, can effectively purify rainwater while controlling runoff, realizes hydrological water quality improvement of a construction area, and is more and more widely applied.
When the construction of the sponge city is promoted, the performance assessment index evaluation of the bioretention facility in the actual rainfall process is carried out, a basis can be provided for the construction effect evaluation and the achievement display of the sponge city, and the method has important significance for promoting the performance improvement of the bioretention facility and the achievement of the sponge construction target. In 11 months in 2014, the Ministry of construction issued "technical guide for sponge city construction", which indicates that the method of hydrology, hydraulic calculation, model simulation and the like can be used for carrying out layer-by-layer decomposition and step-by-step analysis on the total annual runoff quantity control. However, the condition of the bioretention facilities in China is complex, most of the bioretention facilities lack effective on-site performance assessment, most of the bioretention facilities utilize simulation software such as MUSIC and the like to perform performance assessment, for example, the method disclosed in the patent with the application number 201811171065.7, the method acquires partial actual measurement data and then performs software model simulation, and has the problems of insufficient localization degree of a data model, large monitoring deviation, distorted data analysis, incapability of performing on-site real quantitative prediction and evaluation on the performance assessment of the bioretention facilities and the like. Another widely used performance evaluation method for bioretention facilities is to simulate the hydrological water quality treatment effect of actual bioretention facilities by a test device for further evaluation, for example, the device and the evaluation method disclosed in publication No. CN107402041A have the disadvantages of complicated device and complicated structure, the proportion of filler needs to be adjusted in each simulation, and the performance evaluation of bioretention facilities is still performed by simulation experiments, so that the actual conditions on site are difficult to completely reproduce, and the performance evaluation of bioretention facilities cannot be directly and intuitively performed truly.
Therefore, a performance evaluation method which is simple and convenient in device, simple in operation, capable of being popularized in a large scale and capable of objectively and really evaluating the operation processing capacity of the bioretention facility on site is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for evaluating the performance of the sponge of the bioretention facility, which are actually measured on site, wherein the device is simple and convenient, is simple to operate, can be popularized in a large scale, and can objectively and really evaluate the operation processing capacity of the bioretention facility on site.
In order to solve the technical problem, the invention provides a sponge performance evaluation device of a bioretention facility measured in situ, which comprises a heightening plugging device, a simulated rainwater conveying system, a detachable overflow box, an integrated drainage collection metering device and a flow recorder, wherein the heightening plugging device is connected with the simulated rainwater conveying system;
the heightening and plugging device is used for surrounding and blocking the periphery of an overflow well in the bioretention facility;
the simulated rainwater conveying system is used for carrying out quantitative water conveying on the bioretention facilities and is provided with a water inlet flow meter;
the detachable overflow box is arranged on one side of an overflow well in the bioretention facility, the height of the detachable overflow box is consistent with that of the overflow well, the detachable overflow box is connected with an overflow metering device, and the overflow metering device is used for metering overflow flow;
the integrated drainage collecting and metering device is used for extending into an overflow well to collect and meter a drainage pipe, a water outlet flow meter is arranged on the water outlet end of the integrated drainage collecting and metering device, and a water storage cavity is also arranged in the integrated drainage collecting and metering device;
the flow recorder is connected with the water inlet flowmeter and the water outlet flowmeter.
Furthermore, the blocking device comprises four water baffles, the four water baffles are bonded by glass cement to form a four-frame structure, and the height of the four-frame structure is higher than that of the overflow well.
Furthermore, the simulated rainwater conveying system comprises a rainwater conveying vehicle, a rainwater conveying main pipe and a flow controller are arranged on the rainwater conveying vehicle, a first water pump and a plurality of water conveying branch pipes are further arranged on the water conveying main pipe, the water conveying branch pipes are matched with the water inlets of the biological retention facilities in quantity, automatic control valves are arranged on the water conveying branch pipes, and the automatic control valves are adjusted by the flow controller to be opened and closed.
Further, can dismantle overflow tank bottom is provided with fixed stabilizer blade, overflow metering device includes the drinking-water pipe, drinking-water pipe one end with can dismantle the overflow tank and be connected, the other end is connected with the second water pump, the second water pump is connected with overflow flowmeter or area scale water tank.
Furthermore, the integrated drainage collection metering device comprises a collecting box, a water inlet groove is formed in one surface of the collecting box, a sealing strip is arranged on the water inlet groove and protrudes out of the surface of the collecting box, an extrusion air bag is arranged on the other surface of the collecting box corresponding to the water inlet groove, a drainage pipe is arranged at the bottom of the collecting box, the top of the drainage pipe protrudes out of the bottom of the collecting box, the drainage pipe is matched with the inner wall of the collecting box to form a water storage cavity, the drainage pipe is connected with a water outlet flow meter, and the collecting box is further connected with a lifting rope.
A performance evaluation method for a bioretention facility sponge measured on site adopts any one of the evaluation devices, and comprises the following steps:
step 1) selecting conditions such as corresponding rainstorm reappearing period, rainfall duration catchment area and the like according to a local rainstorm intensity formula, measuring the area of the catchment area and the area of bioretention facilities on site, and determining rainfall intensity and total rainfall amount of simulated rainfall;
step 2) raising, plugging and retaining the original overflow well of the bioretention facility through a raising and plugging device, and preventing simulated rainwater from entering the overflow well during actual measurement;
step 3), the detachable overflow box is arranged on one side of the bioretention facility, is inserted and fixed on the surface of the bioretention facility through a fixed support leg arranged at the bottom, and reads the overflow metering device connected with the detachable overflow box, wherein the reading of the overflow metering device at the moment is recorded as Q3;
step 4) extending the integrated drainage collection metering device into the position of a drainage pipe in the overflow well through a lifting rope, enabling a sealing strip of the collecting box to be opposite to the surface of one side with the drainage pipe, stopping lowering the collecting box after the collecting box is located at the position corresponding to the drainage pipe, adjusting the extrusion air bag to inflate and expand the extrusion air bag to fix the integrated drainage collection metering device, and reading a water outlet flow meter on the water outlet end of the integrated drainage collection metering device, wherein the reading at the moment is marked as Q2;
step 5) distributing matched water delivery branch pipes according to the rainfall intensity and the total rainfall amount determined in the step 1) and the quantity of water inlets of the on-site bioretention facilities, carrying out quantitative water delivery on the bioretention facilities through a simulated rainwater delivery system, and respectively reading a water inlet flow meter on the simulated rainwater delivery system before simulated rainwater delivery and after the simulated rainwater delivery is finished to obtain a pre-rainfall reading Q1 and a post-rainfall reading Q4 of the water inlet flow meter;
step 6) recording the readings of the water outlet flow meter and the overflow metering device again after the simulated rainfall is finished to obtain outflow flow Q5 and overflow flow Q6, calculating the total rainfall amount in the rainfall process, the total outflow amount after the rainfall and the total overflow amount after the rainfall are finished, and recording the total rainfall amount, the total outflow amount and the total overflow amount as Q7, Q8 and Q9, wherein the total rainfall amount is Q7= (Q4-Q1), the total outflow amount Q8= (Q5-Q2) and the total overflow amount Q9= (Q6-Q3);
step 7) reading a rainfall and outflow time change curve from the flow recorder, accessing a computer, and directly reading an outflow delay time t1, a flood peak delay time t2, a runoff total reduction rate = (Q7-Q8-Q9)/(Q7-Q9). times.100% and a flood peak reduction rate = (v1-v2)/v1 according to the curve, wherein v1 is the maximum flow speed in the rainfall process, and v2 is the maximum flow speed in the outflow process, so as to obtain an evaluation result.
And further, taking water from the simulated rainwater conveying system and detecting to obtain related pollutant concentration indexes in original simulated rainwater, then taking water from a water storage cavity collected by integrated drainage and detecting to obtain related pollutant concentration indexes in purified rainwater, and calculating the removal rate of each pollutant according to the related pollutant concentration in the original simulated rainwater and the related pollutant concentration in the purified rainwater.
The invention has the beneficial effects that:
1. the device is simple, the operation method is simple and convenient, the cost is low, and the device is convenient for detection personnel to understand and master.
2. The total amount of water inflow can be measured on site by simulating a rainwater conveying system; the total overflow amount can be measured on site by reconstructing a detachable simulated overflow system; the total outflow amount can be measured on site through a convenient collection system; the performance evaluation of the bioretention facilities can be objectively and truly carried out on site through the series of devices without any model software.
3. The device required by the invention can be detached, can be adjusted according to local conditions and construction conditions of different bioretention facilities, has wide application range and can be popularized and used in a large area.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the removable overflow tank of the present invention;
FIG. 3 is a schematic view of the integrated drainage collection and metering device of the present invention;
FIG. 4 is a schematic view of the integrated drainage collection and metering device of the present invention in a lowered position for use;
FIG. 5 is a schematic view of the integrated drainage collection and metering device of the present invention held tightly;
FIG. 6 is a schematic view of the integrated drain collection and metering device of the present invention in position relative to the drain pipe.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1 to 3, an embodiment of the device for evaluating the performance of the sponge of the bioretention facility measured on site according to the invention includes a block-up plugging device 1 for detection, a simulated rainwater conveying system 2, a detachable overflow tank 3, an integrated drainage collection metering device 4 and a flow recorder;
the heightening plugging device is used for surrounding and blocking the periphery of an overflow well 6 in a biological retention facility 5, and prevents simulated rainwater from entering the overflow well in actual measurement;
the simulated rainwater conveying system is used for quantitatively conveying water to the bioretention facilities and comprises a rainwater conveying main pipe and a flow controller, the rainwater conveying main pipe is connected with the water outlet end of a rainwater conveying vehicle 8 through a first water pump 11, a plurality of water conveying branch pipes 12 are further arranged on the rainwater conveying main pipe, the number of the water conveying branch pipes is matched with the number of water inlets 13 of the bioretention facilities, automatic control valves are arranged on the water conveying branch pipes, the automatic control valves are adjusted to be opened and closed by the flow controller, a water inlet flow meter is arranged on the rainwater conveying vehicle, and the water quantity output by the simulated rainwater conveying system is counted by the water inlet flow meter;
the detachable overflow box is arranged on one side of an overflow well in the bioretention facility and is directly inserted and fixed on surface soil of the bioretention facility through a fixed support leg 14 arranged at the bottom, wherein the height of the detachable overflow box is consistent with that of the overflow well; the detachable overflow box is connected with the overflow metering device 7, an inclined slope is arranged in the detachable overflow box, and the overflowing water is converged to one side, so that the collection and metering are facilitated; the overflow metering device is used for metering overflow flow; the overflow metering device comprises a water pumping pipe 15, one end of the water pumping pipe is connected with a detachable overflow box, the other end of the water pumping pipe is connected with a second water pump 16, the second water pump is connected with an overflow flowmeter or a water tank 17 with scales, when the water pumping pipe is connected with the overflow flowmeter, direct discharge can be selected, and when the water pumping pipe is connected with the water tank with scales, data can be obtained by directly reading the scales;
the integrated drainage collecting and metering device is used for extending into the overflow well to collect and meter the drainage pipe, a water outlet flow meter is arranged on the water outlet end of the integrated drainage collecting and metering device, and a water storage cavity is also arranged in the integrated drainage collecting and metering device and is used for detecting the concentration index of related pollutants in the purified rainwater; specifically, metering device is collected in integration drainage includes collecting box 22, and the recess of intaking has been seted up on a collecting box surface, is provided with sealing strip 18 on the recess of intaking, and sealing strip protrusion collecting box surface sets up, and the corresponding collecting box of intake chamber is provided with extrusion gasbag 19 on the other surface, and the collecting box bottom is provided with fluid-discharge tube 20, and the protrusion in collecting box bottom in fluid-discharge tube top, fluid-discharge tube and the cooperation of collecting box inner wall form the water storage chamber, and the fluid-discharge tube is connected with play water flowmeter 111, and the collecting box still is connected with lifting rope 21. When the collecting box is used, the collecting box is directly conveyed into the overflow well through the lifting rope, the sealing strip of the collecting box is opposite to the surface of one side with the drain pipe, as shown in figure 4, after the collecting box is positioned at the position corresponding to the drain pipe, the collecting box stops being put down, the extrusion air bag is inflated and expanded, finally, extrusion force is formed between the collecting box and the overflow well, and the collecting box is abutted against the surface of the overflow well on one side of the drain pipe, as shown in figure 5; referring to fig. 6, due to the arrangement of the sealing strips, after the extrusion is supported tightly, the sealing strips can form effective sealing on the left side and the right side of the drain pipe 112 and the lower portion, the water discharged from the drain pipe can directly enter the collecting box, the water firstly enters the water storage cavity, the water level is discharged from the overflow of the drain pipe after becoming high, and the water in the water storage cavity can be effectively reserved. When the extrusion air bag is inflated, the air bag can be connected with an air pump outside the overflow well through a hose to realize inflation and deflation, and can also be inflated and deflated through an automatic inflation and deflation air pump fixed on the collecting box.
The flow recorder is connected with the water inlet flowmeter and the water outlet flowmeter and is used for acquiring rainfall and outflow curves changing along with time and the like.
Firstly, selecting conditions such as a corresponding rainstorm reappearing period, a catchment area when rainfall lasts for a period of time and the like according to a local rainstorm intensity formula, measuring the area of the catchment area and the area of a biological retention facility on site, and determining the rainfall intensity and the total rainfall amount of the simulated rainfall;
then, the heightening and blocking device is used for heightening and blocking the original overflow well of the bioretention facility, so that simulated rainwater is prevented from entering the overflow well during actual measurement; meanwhile, the detachable overflow tank is arranged on one side of the bioretention facility, fixed support legs arranged at the bottom are inserted and fixed on the surface of the bioretention facility, and an overflow metering device connected with the detachable overflow tank is read to record an overflow flow Q3;
then, the integrated drainage collecting and metering device is stretched into the position of a drainage pipe in the overflow well through a lifting rope, a sealing strip of the collecting box is opposite to the surface of one side with the drainage pipe, the collecting box stops being placed after being positioned at the position corresponding to the drainage pipe, the extrusion air bag is adjusted to be inflated and expanded, the integrated drainage collecting and metering device is fixed, a water outlet flow meter on the water outlet end of the integrated drainage collecting and metering device is read, and the outflow flow Q2 is recorded;
distributing matched water delivery branch pipes according to the determined rainfall intensity and total rainfall amount and the quantity of water inlets of the on-site bioretention facilities, carrying out quantitative water delivery on the bioretention facilities through a simulated rainwater delivery system, and respectively reading a water inlet flow meter on the simulated rainwater delivery system before simulated rainwater delivery and after the simulated rainwater delivery is finished to obtain a pre-rainfall reading Q1 and a post-rainfall reading Q4 of the water inlet flow meter;
after the simulated rainfall is finished, the readings of the water outlet flow meter and the overflow metering device are recorded again to obtain outflow Q5 and overflow Q6, the total rainfall amount in the rainfall process, the total outflow amount after the rainfall and the total overflow amount after the rainfall are calculated and recorded as Q7, Q8 and Q9 respectively, the total rainfall amount Q7= (Q4-Q1), the total outflow Q8= (Q5-Q2) and the total overflow Q9= (Q6-Q3);
and finally, reading a rainfall and outflow time-varying curve from a flow recorder, accessing a computer, and directly reading the outflow delay time t1, the peak flood delay time t2, the runoff total reduction rate = (Q7-Q8-Q9)/(Q7-Q9). times.100% and the peak flood reduction rate = (v1-v2)/v1 according to the curve, wherein v1 is the maximum flow rate in the rainfall process, and v2 is the maximum flow rate in the outflow process, so as to obtain an evaluation result.
After the water in the simulated rainwater conveying system is taken and detected to obtain the related pollutant concentration indexes in original simulated rainwater, the integrated drainage collection metering device is pulled by the lifting rope, the extrusion air bag is deflated, the integrated drainage collection metering device is abutted to the overflow well in a contact manner, the integrated drainage collection metering device is pulled out of the overflow well by the lifting rope, then the water is taken from the water storage cavity of the integrated drainage collection metering device and the related pollutant concentration indexes in purified rainwater are detected, and the removal rate of each pollutant is calculated through the related pollutant concentrations in the original simulated rainwater and the related pollutant concentrations in the purified rainwater.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. A performance evaluation device for a bio-detention facility sponge measured in an actual field is characterized by comprising a heightening and blocking device, a simulated rainwater conveying system, a detachable overflow box, an integrated drainage collection and metering device and a flow recorder;
the heightening and plugging device is used for surrounding and blocking the periphery of an overflow well in the bioretention facility;
the simulated rainwater conveying system is used for carrying out quantitative water conveying on the bioretention facilities and is provided with a water inlet flow meter;
the detachable overflow box is arranged on one side of an overflow well in the bioretention facility, the height of the detachable overflow box is consistent with that of the overflow well, the detachable overflow box is connected with an overflow metering device, and the overflow metering device is used for metering overflow flow;
the integrated drainage collecting and metering device is used for extending into an overflow well to collect and meter a drainage pipe, a water outlet flow meter is arranged on the water outlet end of the integrated drainage collecting and metering device, and a water storage cavity is also arranged in the integrated drainage collecting and metering device;
the flow recorder is connected with the water inlet flowmeter and the water outlet flowmeter.
2. The device for evaluating the performance of the sponge of the bioretention facility measured on site according to claim 1, wherein the elevating and blocking device comprises four water baffles, the four water baffles are bonded by glass cement to form a four-frame structure, and the height of the four-frame structure is higher than that of the overflow well.
3. The sponge performance evaluation device for bioretention facilities actually measured on site according to claim 1, wherein the simulated rainwater conveying system comprises a rainwater conveying vehicle, a conveying main pipe and a flow controller are arranged on the rainwater conveying vehicle, a first water pump and a plurality of water conveying branch pipes are further arranged on the water conveying main pipe, the number of the water conveying branch pipes is matched with that of water inlets of the bioretention facilities, and automatic control valves are arranged on the water conveying branch pipes and are adjusted to be opened and closed by the flow controller.
4. The device for evaluating the performance of the sponge of the bioretention facility measured on site according to claim 1, wherein the bottom of the detachable overflow box is provided with a fixed support leg, the overflow metering device comprises a water pumping pipe, one end of the water pumping pipe is connected with the detachable overflow box, the other end of the water pumping pipe is connected with a second water pump, and the second water pump is connected with an overflow flowmeter or a water tank with scales.
5. The sponge performance evaluation device for the in-situ measured bioretention facility of claim 1, wherein the integrated drainage collection metering device comprises a collection box, a water inlet groove is formed in one surface of the collection box, a sealing strip is arranged on the water inlet groove and protrudes out of the surface of the collection box, an extrusion air bag is arranged on the other surface of the collection box corresponding to the water inlet groove, a drainage pipe is arranged at the bottom of the collection box, the top of the drainage pipe protrudes out of the bottom of the collection box, the drainage pipe is matched with the inner wall of the collection box to form a water storage cavity, the drainage pipe is connected with a water outlet flow meter, and the collection box is further connected with a lifting rope.
6. A performance evaluation method of a bioretention facility sponge measured on site is characterized in that the evaluation device of any one of claims 1-5 is adopted, and the method comprises the following steps:
step 1) selecting conditions such as corresponding rainstorm reappearing period, rainfall duration catchment area and the like according to a local rainstorm intensity formula, measuring the area of the catchment area and the area of bioretention facilities on site, and determining rainfall intensity and total rainfall amount of simulated rainfall;
step 2) raising, plugging and retaining the original overflow well of the bioretention facility through a raising and plugging device, and preventing simulated rainwater from entering the overflow well during actual measurement;
step 3), the detachable overflow box is arranged on one side of the bioretention facility, is inserted and fixed on the surface of the bioretention facility through a fixed support leg arranged at the bottom, and reads the overflow metering device connected with the detachable overflow box, wherein the reading of the overflow metering device at the moment is recorded as Q3;
step 4) extending the integrated drainage collection metering device into the position of a drainage pipe in the overflow well through a lifting rope, enabling a sealing strip of the collecting box to be opposite to the surface of one side with the drainage pipe, stopping lowering the collecting box after the collecting box is located at the position corresponding to the drainage pipe, adjusting the extrusion air bag to inflate and expand the extrusion air bag to fix the integrated drainage collection metering device, and reading a water outlet flow meter on the water outlet end of the integrated drainage collection metering device, wherein the reading at the moment is marked as Q2;
step 5) distributing matched water delivery branch pipes according to the rainfall intensity and the total rainfall amount determined in the step 1) and the quantity of water inlets of the on-site bioretention facilities, carrying out quantitative water delivery on the bioretention facilities through a simulated rainwater delivery system, and respectively reading a water inlet flow meter on the simulated rainwater delivery system before simulated rainwater delivery and after the simulated rainwater delivery is finished to obtain a pre-rainfall reading Q1 and a post-rainfall reading Q4 of the water inlet flow meter;
step 6) recording the readings of the water outlet flow meter and the overflow metering device again after the simulated rainfall is finished to obtain outflow flow Q5 and overflow flow Q6, calculating the total rainfall amount in the rainfall process, the total outflow amount after the rainfall and the total overflow amount after the rainfall are finished, and recording the total rainfall amount, the total outflow amount and the total overflow amount as Q7, Q8 and Q9, wherein the total rainfall amount is Q7= (Q4-Q1), the total outflow amount Q8= (Q5-Q2) and the total overflow amount Q9= (Q6-Q3);
step 7) reading a rainfall and outflow time change curve from the flow recorder, accessing a computer, and directly reading an outflow delay time t1, a flood peak delay time t2, a runoff total reduction rate = (Q7-Q8-Q9)/(Q7-Q9). times.100% and a flood peak reduction rate = (v1-v2)/v1 according to the curve, wherein v1 is the maximum flow speed in the rainfall process, and v2 is the maximum flow speed in the outflow process, so as to obtain an evaluation result.
7. The method of claim 6, wherein water in the simulated rainwater delivery system is taken and detected to obtain an index of concentration of a relevant pollutant in original simulated rainwater, water is taken in a water storage chamber of the integrated drainage collection and detected to obtain an index of concentration of a relevant pollutant in purified rainwater, and the removal rate of each pollutant is calculated from the concentration of the relevant pollutant in the original simulated rainwater and the concentration of the relevant pollutant in the purified rainwater.
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