39 results about "Cloudburst" patented technology

The invention relates to raindrop triggering type runoff automatic sampling device and a method, which can be used for carrying out regular-time automatic monitoring on storm runoffs in the environment monitoring field or the water and soil conservation field. According to the sampling device, the whole sampling device is controlled to be started through a raindrop triggering device; when rainfall reaches a set value, a PLC (Programmable Logic Controller) can start a step motor, a water pump and a peristaltic pump in sequence according to steps and time intervals which are set in advance, so as to collect runoff water samples in different periods and point locations and assign to corresponding sample bottles for storage. By being arranged near a riverway for sampling in advance, the raindrop triggering type runoff automatic sampling device can automatically collect the runoff water samples in an unattended operation during rainstorm, so that the outdoor sampling difficulty of rainstorm runoffs is greatly reduced, and the labor intensity of the sampling staff is reduced. Furthermore, the raindrop triggering type runoff automatic sampling device further has the advantages of high sampling reliability, low production cost and compact structure.

The invention relates to a method for estimating the nonpoint source pollution load of a village adjacent to a river. The method comprises the following steps: 1) basic information collection, in which average rainfalls R1, R2 and R3 of years of accumulation for light rain, moderate rain and heavy rain to rainstorm in a certain place, village area A and other basic situations are acquired; 2) field detection, in which, every runoff coefficient, runoff duration and runoff yield area of rainfall duration, rainfall capacity and rainfall runoff of an effective rainfall number are detected, and chemical oxygen demand, total nitrogen and total phosphorus of a collected water sample are detected; and 3) nonpoint source pollution load model estimation, in which, the annual pollution loads of chemical oxygen demand, total nitrogen and total phosphorus of nonpoint source pollutants of the village by the river are calculated by adopting a formula. The calculation method provided by the inventionhas more guidance significance, and is convenient to develop related control and management measures.

The invention provides a stable water flow field-based method for simulating confluence of basin surface runoff and a real-time calculation device. The method comprises the following steps: S1, establishing an N-S equation under a grid mode; S2, performing water flow mixing simulating in a runoff confluence mode; and S3, iterating a water flow field in a basin by utilizing the runoff confluence model obtained in the S2 so as to obtain a stable water flow field. The method can provide decision support to quick simulation and evaluation for rainstorm and flood disasters in a basin, and has a relatively high application value.

The invention discloses a refined-grid waterlogging forecasting method. The method comprises: S1, grid division is carried out on an urban area by using a divided pipenetwork drainage area as a unit and an underlying surface type as a basis; S2, an SCS model is established if the grid area includes a drainage basin, and an SWMM model is established if no riverway drainage basin exists in the gridarea; and S3, a runoff volume of the grid area and a runoff volume of an overflowing node under the current rainstorm weather in city are calculated respectively based on the SCS model and the SWMM model, the overflowing data as parameters are inputted into an LISFLOOD-FP model to simulate a flooding range, a water depth, and a flooding process of the city. According to the method disclosed by theinvention, the urban area is divided into a plurality of grids and calculation is carried out by selecting different models, so that the accuracy of water accumulating forecasting is improved.

The invention discloses a mini-flow or storm radial flow self-gathering system to gather and gauge random time step flow sample at direct pattern, which comprises the following parts: pumping, dividing and gathering structures, wherein the pumping structure contains pump in the dam detecting well of mini-flow outlet and floating control stroke switch; the diving structure contains motor, stroke switch, time-delay relay J, diving control disk controlled by torsion bar switch on the lower frame; the gathering structure contains dividing disk on the frame, which contains dividing groove; each opening of dividing groove connects the water gathering cup under the groove. The invention simplifies the structure and saves the power and cost, which is more fitful for field sample test and data gathering.

The invention discloses a 0.1mm and 0.5mm sense quantities combined multi-tipping bucket rainfall sensor. A cylindrical rain holder is arranged; a base is arranged at the bottom of the cylindrical rain holder; and a lower water collector, a lower large tipping bucket, a middle water collector, a middle small tipping bucket, an upper water collector, an upper small tipping bucket, a vertical board and a funnel which are all arranged on the base in the rain holder in sequence from the top down, wherein an anti-blocking device is arranged above the funnel. The 0.1mm and 0.5mm sense quantities combined multi-tipping bucket rainfall sensor is reasonable in structure, novel and initiative at home; the technical indexes exceed the rule of the national standard GB / T11832-200 tipping bucket type rainfall gauge; and the disadvantage that the traditional double-tipping bucket type rainfall sensors can not tip rapidly in heavy rain and do not tip in light rain. The 0.1mm and 0.5mm sense quantities combined multi-tipping bucket rainfall sensor is suitable for measuring the rainfall of areas with big rainfall intensity change and continuous rainstorms, and can fill the gap of the domestic rainfall sensors for the measurement of heavy rain.

The invention turns a hurricane / tropical cyclone into a tropical rainstorm by spraying a super coolant such as liquid oxygen, or liquid hydrogen, or liquid nitrogen, or other super cold liquid gas around the top of the eye wall and additionally if needed, into the front of the eye wall using aircraft with pre-measured amounts of super coolant. Based on actual results, a real time computer system will be developed to enable communications between aircraft and control the amount of super coolant dispersed. The result of the invention will reduce / eliminate the damage to life and property due to high winds and storm surge as well as the staggering costs for rebuilding.

The invention relates to a dual-core dual-drive flood forecast method. The dual-core dual-drive flood forecast method includes hydrological mode selection; runoff producing parameter calibration; confluence parameter calibration; rainfall uniformity determination; zone dividing; runoff producing calculation; confluence calculation; superposition; and forecast result issue. The dual-core dual-drive flood forecast method for non-uniform rainfall divides a drainage basin into a rainstorm core zone and a non-rainstorm core zone according to spatial distribution of non-uniform rainfall centers on the basis of rainstorm food features of semi-humid semi-arid regions and arid regions, establishes hydrological modes to perform runoff producing calculation and confluence calculation, fully utilizes rainfall distribution information of each rainfall site in the drainage basin during rainstorm, considers differences of the soil water content in drainage basins at the beginning of rainfall, is simple, and is easy to operate.

The invention discloses a method of advanced flood early-warning and forecasting. According to a rainstorm similarity comprehensive-measurement method based on a total-quantity similarity index, a process similarity index, an earth-mover distance index and a rainstorm distribution similarity index, a similar rainstorm and a typical flood process corresponding thereto are found in historical rainstorms, then the typical flood process is scaled according to a rainstorm quantity ratio, and thus advanced flood early-warning and forecasting are realized. According to the method of the invention, aflood process forecasted period by period can be continuously updated with increasing of rainstorm flood process information, forecast precision shows gradual rising, thus a longer forecast period isobtained, and decision support can be provided for reservoir dispatching.

The invention discloses an urban rainstorm waterlogging catchment area analysis method. The method comprises the steps of adopting an SMS surface water simulation system to conduct gridgeneration on any selected area to obtain a calculation area; obtaining DEM data of a to-be-studied area, assigning the roughness and the DEM data to a calculation area, and calculating the elevation of each grid; adding rainfall data into the calculation area, and calculating rainfall yield confluence of each grid by adopting a pre-loss and post-loss method; according to the rainfall yield confluence of each grid, calculating the water depth and the water flow speed of each grid by adopting a surface two-dimensional hydraulic model; calculating the side flow of the grid with the water depth data according to the water flow speed of the grid with the water depth data and the side length of the side of the grid through which the water flow speed passes; and selecting a grid with the water depth greater than a set threshold value as an analysis grid, and judging whether the analysis grid is a catchment area or not according to the water depth of the analysis grid, the water depth of the grid adjacent to the analysis grid and the side flow rate and direction of each grid edge.

The present invention discloses a four-prevention method for responding to city rainstorm waterlogging. The method concretely comprises four steps, and comprises: rainstorm waterlogging estimation, rainstorm waterlogging predication, rainstorm waterlogging early warning and rainstorm waterlogging response plan. The four-prevention method for responding to city rainstorm waterlogging realizes the medium and long term estimation, the short-term prediction, the near-real time early warning and the real-time plan service of the city rainstorm waterlogging and provides a set of non-engineering measures capable of actual operation for the city rainstorm waterlogging response.

The invention discloses a mountain flood disaster forming time determination method, belongs to the technical field of mountain flood disaster early warning, and aims to provide the mountain flood disaster forming time determination method which solves the problem in reasonable determination of maximum rainfall in a period corresponding to disaster forming flood during operations of determining an early warning index by utilizing a statistical method and performing testing and rechecking on the early warning index. According to the method, an average value of a disaster forming time initial value and disaster forming flow occurrence time is taken as disaster forming time, wherein the disaster forming time initial value t(initial) is determined according to a critical curve of rainstorm and an ''accumulated individual rainfall-first 1h rainfall-time'' curve; the disaster forming time initial value t(initial) refers to time corresponding to a first intersection point of the two curves; and the disaster forming flow occurrence time t(flow) is equal to tm-delta t, delta t is a time difference between the disaster forming time initial value and the disaster forming flow occurrence time, and tm is peak occurrence time. The method can be used for determining, testing and re-checking the early warning index of a mountain flood disaster.

The invention discloses a refined diagnosis method for urban agglomeration area flood risk zoning. The method comprises the following steps of using a GIS spatial data analysis function to carry out data rasterization and standardization processing on each index; constructing a judgment matrix corresponding to the index system; calculating the relative weight of each index and the flood risk degree of different grid units so that establishment of an urban agglomeration area flood risk degree evaluation model based on a fuzzy analytic hierarchy process and drawing of a flood risk map are realized. From the perspectives of rainstorm distribution characteristics, historical flood distribution characteristics, rainstorm ponding risk distribution characteristics of all cities and the like, theflood risk distribution characteristics of urban agglomeration areas are systematically diagnosed in an omnibearing and multi-angle mode. The flood risk degrees and risk levels of different dangerousareas are accurately calculated, a multi-index problem is scientifically and objectively synthesized into a single-index form, a single index capable of effectively measuring the flood risk degree isconstructed, and a reliable technical support means is provided for flood dangerous area division.

A glass grit blasting technology for increasing the stress corrosion resistance of the welded seam between stainless steels includes such steps as cleaning the surface of the welded seam, blasting the glass grits onto the welded seam by a blasting gun driven by compressed air and with an inclination by 70-100 deg.C, cleaning the surface of welded workpiece, and detecting the residual stress by X-ray diffractometer.

The invention discloses a large hydraulic extreme weather simulator which consists of three functional areas, namely a high and low temperature humidity alternating, sunlight and wind speed simulation area, a salt mist, rainstorm and etchant gas simulation area and a temperature impact simulation area. The large hydraulic extreme weather simulator is characterized in that a test simulator can be used for simulating extreme weather parameters such as high and low temperature, humidity, rainstorm, sunlight and wind speed, environmental conditions such as aging, corrosion and pressure water as well as a coupling action of the extreme weather parameters and the environmental conditions. According to the invention, parameter simulation of single mode such as high temperature, low temperature, humidity circulation, cold wave attack, long-duration heat and drought, temperature impact, salt mist, acid gas corrosion and pressure water environment and coupling of the single mode, a load and a pressure water environment are realized through the three functional areas; key test parameters are provided for research of hydraulic structure basic materials and members for safely coping with the extreme weather, and the large hydraulic extreme weather simulator has the characteristics of capability of simulating an actual service environment, wide applicability, strong operability and the like.

The invention discloses a power distribution box for preventing rainwater from entering during rainstorm. The power distribution box structurally comprises a box door, a protective cover, an indicating lamp, a top cover, a waterproof device, a box body and a door lock. According to the power distribution box for preventing rainwater from entering during rainstorm in the invention, part of rainwater can enter the interior of a water storage device when a rainstorm occurs, meanwhile, the rainwater can be concentrated by a water collecting base, the rainwater can flow into a shell of the water storage device so that the rainwater can be quickly collected, a big floating block and a small floating block are driven to float by means of the buoyancy of the water, when the small floating block floats, a proximity switch is closed, an electromagnet loses power, and the big floating block floats upwards to drive a connecting rod to move upwards. Through a structure in hinged connection with a waterproof sealing plate and the magnetism of the internal magnet of the device, the magnet is adsorbed on the box body, and a heat dissipation port is closed, so that the rainwater is prevented from entering to damage components.

The invention provides a mountainous area small watershed mountain torrent disaster divisional early warning method. The method includes the following steps that: mountainous area small watersheds requiring mountain torrent disaster early warning are selected as target river sections, and river sections of which the banks require life and property protection are selected from the target river sections so as to be adopted as river sections to be subjected to early warning; 2, field investigation is conducted for past mountain flood disasters in the river sections to be subjected to early warning, disaster stricken regions where mountain torrent disasters are mainly manifested as washing-out, burying and submersion are marked as washing-out, burying and submersion disaster stricken regions;3, torrent disaster early warning indexes are established for the washing-out, burying and submersion disaster stricken regions respectively; and 4, the gradients of the bed of the river section of the burying disaster stricken region and the bed of the river section of an upstream river section connected with the burying disaster stricken region are measured before months in which rainstorms appear frequently, and early warnings of different levels are emitted according to the ratio of the gradients of the beds of the two river sections, and when there is a rainstorm in the target river section, the early warning indexes of the washing-out disaster stricken region and submersion disaster stricken region are monitored, and an early warning is emitted when the indexes of the washing-out disaster stricken region and submersion disaster stricken region reach the early warning indexes.

The invention provides a water level early-warning method based on the small-watershed rainstorm torrential flood level rising changes in a mountainous area. The method comprises: step one, selectinga small-watershed channel segment needing rainstorm torrential flood warning as a target channel segment and determining a flood water level of the target channel segment based on an object with highflood vulnerability; step two, under the condition of rainstorm occurrence at the upstream of the target channel segment, monitoring a flood water level rising rate of the control fracture surface ofthe target channel segment till flood subsidence; and step three, determining whether to carry out early warning of migration preparation based on the changing information of the flood water level rising rate; if so, determining whether the flood reaches a flood water level sudden rising stage based on the real-time flood water level rising rate changing information; and if so, estimating estimated time of reaching the disaster water level by the flood water level and an estimated time of reaching the disaster water level by the flood water level; and carrying out migration warning immediatelyas soon as possible before the estimated time of reaching the disaster water level by the flood water level.

The invention belongs to the technical field of sea water desalination and particularly relates to a method of using deep sea simulated water to cultivate deep sea marine organisms, comprising: usingshallow sea water, sub-sea water or costal deep well water having low salinity of 5%. To 20%. as original water to perform pretreatment, decreasing turbidity of the original water to 1 ppm and below,nano-filtering the pretreated original water to obtain nano-filtered water, and subjecting the nano-filtered water to reverse osmosis treatment to obtain concentrated water, similar to deep sea water,having the salinity of 28%. To 36%.; using the concentrated water to cultivate marine organisms in deep sea environments. The method provided herein has the advantages that influence of natural disasters such as storm, red tide and typhoons can be greatly avoided so that dependence on weather avoided; in addition, the method may provide fewer limits so that popularizing sea water cultivation to the inland is made possible.

The application discloses a method for predicting typhoons and heavy rains in southern China based on low frequency flow field map for predicting the typhoons and heavy rains in southern China 10-30 days in advance. The predicting method comprises the following steps of: determining critical areas related to typhoons and heavy rains in southern China on the low frequency flow field map; analyzinglow frequency system characteristics related to typhoons and heavy rains of the southern China in the critical areas; and establishing a prediction model based on the characteristics of the low frequency system. The application can predict the typhoons and heavy rains in southern China 30 days in advance.

The invention provides a gully bed water level early-warning method suitable for different types of disasters caused by rainstorms and torrential flood. The gully bed water level early-warning method comprises the following steps that (1) the section of a gully bed for preventing and treating rainstorm and torrential flood disasters is selected, and an early-warning water level is determined; (2) it is assumed that the gully bed is submerged by the rainstorms and the torrential flood, the gully bed bottom pressure stress when the gully bed is submerged by the rainstorms and the torrential flood with different depths is calculated, and a gully bed bottom pressure stress and water level change relationship graph is drawn; and (3) during the rainstorms and the torrential flood, the change of the gully bed bottom pressure stress and the gully bed section water level is monitored in real time and is recorded as mark points (Fp<s>, Z<s>), the mark points are marked in the relationship graph, the types of the current rainstorms and the current torrential flood are judged according to the positions wherein the mark points are located, the early-warning range of the gully bed bottom pressure stress of the different types of the rainstorms and the torrential flood is determined through the early-warning water level according to the relationship graph, and when the real-timely monitored gully bed pressure stress reaches the early-warning range of the gully bed bottom pressure stress of the corresponding type of the rainstorms and the torrential flood, real-time early-warning of different types of rainstorms and the torrential flood is issued.

The invention provides a progressive decision-making method for forecasting a rainstorm in a mountainous region. The progressive decision-making method comprises a multi-mode nested mountainous regionrainstorm progressive forecasting method, a forecasting mode nested node control method and a mountainous region rainstorm target evaluation and feedback method. According to the progressive decision-making method, a rainfall forecasting mode comprising a numerical weather forecasting product, comprehensive forecasting information based on high-altitude and ground atmospheric sounding data, radarand satellite prediction information and the like is adopted, and rainfall forecasting is gradually carried out according to spatial scales from large to small and time scales from long to short forthe differences of spatial-temporal scales and effects in various modes of forecasting, and a method of continuously evaluating a forecasting target, circulating frequency of a decision-making mode and forecasting results is adopted.

The invention discloses an outdoor power box facility accidental water inlet monitoring device which structurally comprises an observation window, an external adjusting button, a right protection boxdoor, a box switch, a water inlet detection device, a supporting base, a left protection box door, an inspection repair window, heat dissipation ventilation devices, a case protection shell and lifting grooves, and the four lifting grooves are arranged at the left end and the right end of the upper end of the case protection shell, and the heat dissipation ventilation devices are arranged at the left end and the right end of the case protection shell. The monitoring device has the beneficial effects that the water inlet detection device is additionally arranged on the device, in daily use of the device, under the condition that the rainstorm is suddenly reduced or the water volume is large, and the water is accumulated in the device, the warning and reminding can be carried out in time, sothat workers can check and repair in time, the workload of workers is reduced, and the service life of the device is greatly prolonged.

The invention discloses a method for planting fraxinus velutina in saline-alkali soil. The method includes the first step of digging a tree hole according to the size of a root ball of fraxinus velutina, wherein the depth of the tree hole is higher than the height of the root ball by 50-60 cm, and the diameter of the tree hole is larger than that of the root ball by 10-20 cm; the second step of laying a salt barrier layer in the tree hole, wherein the thickness of the salt barrier layer is 40-50 cm; the third step of placing a sapling at the center in the tree hole, filling the tree hole, performing compaction, and using much water for thorough watering. The salt barrier layer can effectively reduce the change amplitude of soil moisture, the content of the soil moisture fluctuates in a relatively small range, and plants can be protected from excessive hydropenia during the dry season and can be protected from death caused by excessive flood during the rainstorm season. The salt barrierlayer can block water rising channels such as a soil capillary, inhibit the increase of soil salinity, effectively alleviate the strong change of salt and reduce the variation range of EC; therefore,the salt barrier layer is beneficial to the survival of the fraxinus velutina in the saline-alkali soil and smooth growth, and also has a long-lasting saline-alkali soil improvement effect.

The invention relates to a method for estimating the nonpoint source pollution load of a village adjacent to a river. The method comprises the following steps: 1) basic information collection, in which average rainfalls R1, R2 and R3 of years of accumulation for light rain, moderate rain and heavy rain to rainstorm in a certain place, village area A and other basic situations are acquired; 2) field detection, in which, every runoff coefficient, runoff duration and runoff yield area of rainfall duration, rainfall capacity and rainfall runoff of an effective rainfall number are detected, and chemical oxygen demand, total nitrogen and total phosphorus of a collected water sample are detected; and 3) nonpoint source pollution load model estimation, in which, the annual pollution loads of chemical oxygen demand, total nitrogen and total phosphorus of nonpoint source pollutants of the village by the river are calculated by adopting a formula. The calculation method provided by the invention has more guidance significance, and is convenient to develop related control and management measures.

The invention relates to the technical field of prediction of weather states, and especially relates to a modeling evaluation method for urban heavy rain inundation. The method includes the following steps: (1), establishing a to-be-evaluated area into a digital elevation model, and dividing the model into grids; (2), generating a river network, establishing a river network on the digital elevation model, and determining the current direction and speed of a basin; (3) determining inundated areas, the grids the river flows across being river grids and other grids being ground grids, determining initial river grids and inundation conditions, and successively determining, from the initial river grids, whether the ground grids adjacent the river grids meet inundation conditions, wherein the ground grids are inundated grids if the conditions are satisfied, otherwise, the ground grids are not inundated grids; (4) determining the inundation critical rainfall; (5) determining inundation calamity risks; and (6) evaluating inundation risks. Through adoption of the method, the inundation coverage, the inundation depth, the inundation risks and losses or the like can be predicated before heavy rain, early warning is carried out timely, property losses are minimized, and personal safety is guaranteed.

The invention discloses a roof greening rainwater detention storage monitoring system and monitoring method. The system comprises a plant box, a drainage weight measuring module, a soil moisture measuring module, an environmental parameter collecting module and a control module; the drainage weight measuring module is connected with the plant box; and the control module is connected with the drainage weight measuring module, the soil moisture measuring module, and the environmental parameter collecting module. The roof greening rainwater detention storage monitoring system and monitoring method of the invention can be applied to high-density hot and humid climate regions. With the roof greening rainwater detention storage monitoring system and monitoring method adopted, the various relevant parameters of different roof greening plants under different rainfall types (light rain, moderate rain, heavy rain and storms) over a long time can be monitored; and data support can be provided forthe implementation of research on the influence of the rainwater detention storage of different roof greening plants and the matrixes thereof, the exploration of roof greening patterns suitable for high-density hot and humid climates, the alleviation of the pressure of urban pipe networks and the research on roof greening rainwater detention storage in sponge cities.

The invention discloses an artificial rainfall simulation device for debris flow testing. The pressure of a water tank can be flexibly adjusted conveniently through the device, corresponding pressurecan be set according to the underlying conditions and rainfall characteristics of an area, so as to further control the rainfall type; the concentration phenomenon of area point rainstorm can be simulated through regulating the internal pressure of sub water tanks; through closing one or more of the sub water tanks, and the rainfall process under windy weather can be simulated, and the rainstorm type can be simulated through overlapping the rainfall area; the rainfall data can be input through a computer system, the rainfall type can be accurately and rapidly controlled by controlling a pressure control valve through a controller; and the pressure control valve can be used for well filtering solid particles, phytoplankton and the like in river water, so that the energy conservation and environment protection can be achieved, and the service life of a nozzle can be prolonged.

The invention provides a risk assessment method for city waterlogging taking water level jacking influence of tidal rivers. The method comprises following steps: determining probabilities of simultaneous distribution between rainstorms-tidal river water levels, determining a hydraulic computation grid of a hydrology-drainage system for analyses of city waterlogging risks, creating a coupling model of a hydrology-drainage system to calculate a waterlogging parameter h in the grid, creating a waterlogging risk analyzing map taking water level jacking influence of tidal rivers, covering probability density of simultaneous distribution to a hydraulic grid of the hydrology-drainage system, connecting same waterlogging parmaters h to the isoline Lh; and calculating different occurrence probabilities of h0 to obtain city waterlogging parameter values in different recurrence intervals. The risk assessment method for city waterlogging taking water level jacking influence of tidal rivers has following beneficial effects: rainstorms and high water levels of tidal rivers can be imitated within the extreme value range so that low dependence is on hydrologic hydraulic historical data, thereby enhancing engineering practicability; and only by calculating the combined scene between a specific hydrology-drainage system and the hydraulic grid, coupling events of rainfall and tidal river water levels are not needed to be imitated so that assessment efficiency is greatly increased.

The invention discloses a low-lying green space flow limiting facility for relieving a small-watershed waterlogging disaster of a city. The low-lying green space flow limiting facility comprises low-lying green spaces arranged on the periphery of a road, wherein edges of the low-lying green spaces are lower than the surface of the road; the elevations of the low-lying green spaces are gradually reduced towards the middles so that a middle low-point area for storing rainwater is formed; and the middle low-point area is provided with a catch basin which is connected with a municipal drainage pipe network. By using the low-lying green space flow limiting facility, rainwater on the surface of the road is stored in the peripheral low-lying green spaces, and then is drained in the municipal drainage pipe network through the catch basin of the middle low-point area. By the design, the water logging time of the low-lying green spaces is shortened, water in soil of the green spaces is drained, the number of rainwater openings in sides of the road is reduced, the water drainage ability of the existing municipal drainage pipe network is sufficiently utilized, blockage is relieved, long-time and high-quantity rainstorm can be handled easily, heavy rain which was not encountered in the past 50 years can be effectively handled, requirements on a new city water drainage and waterlogging prevention outline can be met, the planning design on the low-lying green spaces is improved fundamentally, and the small-watershed waterlogging disaster of the city is relieved.