359 results about "Rainfall runoff" patented technology

The invention discloses a design method for a distributed hydrological model by using a grid as an analog unit, which is called as ESSI for short. The design method comprises the following steps of: obtainment of a distributed parameter: converting vector data into grid data; generalization of a watershed hydrological process: establishing a universal runoff generating type for the grid; design of a runoff generating process: respectively computing the water-quantity distributing condition of each part according to different prior-period soil water conditions; design of a flow collecting process: respectively designing a Muskingum-Cunge method, a delay algorithm and a riverway segmentation Muskingum method for the flow collecting process computation of the model under different conditions; and model development and integration. The invention not only can finish the watershed hydrological process simulation at an arid region and a humid region, but also can realize the short-term flood forecast and the long-term rainfall-runoff process simulation and prediction of a watershed by using modularization and integration ideas as means, thereby providing scientific reference bases for deeply learning about the physical mechanism of water circulation by people, reducing the drought and water-logging disasters and reasonably developing and utilizing water resources.

The invention relates to a hydrological model calibrating method used for small watershed individual flood forecasting, comprising the following steps: collecting and treating data of a typical rainfall flood process; selecting a hydrologic catchment model with a mixed runoff generation mechanism; determining an objective function used for small watershed individual flood simulation; optimally selecting parameters for calibrating a hydrological model; and judging the applicability of the calibrated hydrological model to individual flood simulation. Aiming at defects in calibration of the hydrological model and by combining with the rainfall runoff generation characteristics of small watersheds in the north, a concentrated hydrological model with a mixed runoff generation mechanism is selected; by taking SCE-UA algorithm as basis and comprehensively considering three flood elements including flood peak, flood volume and flood hygrograph, parameters of the hydrological model can be calibrated by constructing a comprehensive objective function with variable weight; and on the basis of evaluating the calibrating effect of the hydrological model, a three-level judgment criteria comprehensively considering rainfall characteristics, drainage area and engineering requirements is provided, so that the calibrated hydrological model can better meet the requirement of flood forecasting ofsmall watersheds in the north.

The present invention discloses a low elevation greenbelt rainwater regulation scheduling pool and a distributed rainwater regulation scheduling pool system. The distributed rainwater regulation scheduling pool system comprises a low elevation greenbelt (1), a rainwater overflow well (2) and a rainwater regulation scheduling pool (7), and water storage, drainage and supply which are integrated with a rainwater pipe network or a sewage pipe network are achieved. Compared with the prior art, rainfall runoff and flood detention can be effectively adjusted, runoff pollution can be reduced, and purification, storage and utilization functions of rainwater are fulfilled; and the system is tightly combined with the rainwater and sewage pipe networks of a city, the problems of urban inland inundation caused by rainstorm, the runoff pollution caused by rain wash, and rainwater resource utilization are solved, water storage is scheduled according to drainage ability of drainage pipelines, an important means is provided for sponge urban construction, and the system has outstanding social, environmental and economic benefits.

The invention discloses an urban road rainfall runoff ecological coprocessing device and a method. The device comprises an urban road rainfall runoff ecological coprocessing box and a bioretention purification unit, wherein an overflow weir board, a second screen mesh partition and a perforation partition are arranged in the urban road rainfall runoff ecological coprocessing box at intervals sequentially; the interior of a box body is divided into an overflow chamber, a water inlet chamber, a water distribution chamber and a bioretention purification chamber that are sequentially arranged by the overflow weir board, the second screen mesh partition and the perforation partition; and the bioretention purification unit is arranged in the bioretention purification chamber, and comprises a gravel layer, a sand filter layer, a planting soil layer and plants. The device and the method can sequentially remove floating matters, particles and soluble pollutants that are in different particle sizes in rainfall runoff, achieve hierarchical control of the pollutants in the rainfall runoff, can store a part of rainfall runoff to meet growth requirements of the plants in the bioretention unit, achieve a water conservation effect, and can also achieve multi-purpose control of water quality and water quantity of the urban road rainfall runoff.

The invention belongs to the technical field of water treatment and particularly relates to a method and a system for advanced treatment of centralized rural domestic sewage. The treatment system comprises a hydrolytic acidification tank, a composite tower type ecological filter and a surface flow artificial wetland system. The treatment method comprises the following steps of: collecting sewage through a pipe network, allowing the sewage to enter the hydrolytic acidification tank which is a landfill tank, stabilizing and regulating the water quantity, and pumping the sewage into a high-position service reservoir by using a submersible electric pump with the head of more than 5m; distributing the domestic sewage of the hydrolytic acidification tank into the composite tower type ecological filter by strengthening water distribution measures, and removing organic pollutants, total nitrogen, ammonia nitrogen, total phosphorus and pathogenic microorganisms in the sewage; and allowing tail water and collected rainfall runoff to enter the artificial wetland system for advanced treatment. A good water environment landscape can be built for an artificial wetland; and the effluent reaches the first-grade A standard of discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002).

The invention relates to an automatic urban rainfall runoff sampler characterized by comprising a tank body, a catchment structure, a sampling chamber and an instrument control room, wherein the tank body is cuboid; an openable upper cover constitutes the upper part of the tank body and is fixed with the lower part of the tank body via fasteners; hooks are arranged at four corners of the upper cover of the tank body; the catchment structure comprises a detachable catchment hopper arranged outside the tank body and an automatic opening/closing device thereof; the sampling chamber consists of a water guiding pipe, a water inlet pipe, a rotating shaft, a sampling base, a sampling ring and a water discharging pipe; the instrument control room is located on the right side of the tank body and separated from the sampling chamber; a rainwater sensor, a stepping motor and a storage battery are placed inside the instrument control room; and the instrument control room is further provided with an openable door, so as to facilitate the device maintenance and repair. The automatic urban rainfall runoff sampler of the invention has the characteristics of high automation level, compact structure, small size, high portability and convenient management. Therefore, the invention is applicable to the collection of rainfall runoff in the urban wayside sewers and other places for the collection of rainfall runoff or water flow.

The invention discloses a method for calculating dynamic water storage capacity runoff yield in soil freeze-thaw process, and belongs to a hydrological science category in geophysical science categories. The method comprises the following steps of: calculating frozen soil depths at different times in grids of a watershed according to soil temperature distribution; analyzing day-by-day spatial distribution conditions of the frozen soil depths so as to obtain field capacities, distributed along with time, of aeration zones in different grids of the watershed; finding out the maximum field capacities in different grids of the watershed, and calculating the maximum water-holding capacity of the watershed; and calculating a soil freeze-thaw runoff yield of the watershed according to the obtained maximum field capacities in different grids and the maximum water holding capacity of the watershed. According to the method disclosed by the invention, the day-by-day soil freeze/thaw, frozen soil depths and soil temperatures can be simulated according to observed air temperatures, and the day-by-day process of thaw/rainfall runoff can be calculated according to rainfall observation, so that the runoff simulation precision in soil thaw periods in spring is improved, scientific basis is provided for the spring flood prevention decisions, and the gap of frozen soil area runoff yield calculation in the existing home and aboard hydrological models is filled.

The invention relates to revetment combination system that has cutoff purifying function to the river rainfall runoff surface contaminating material. It sets non-sand concrete curbstone at the intersection of road and bank slope, a catch water channel is set at one side of intersection road, where coarse sand bedding is paved. Crushed stones are filled in the channel, and the top of channel is sealed by non-sand concrete. On the band slope toward water side paves coarse sand, crushed stone of different thickness, and ecology brick. Cement laid stone masonry breast wall is set at basal slope, and growing plant at the bank slope. It increases the residence time for runoff in the system and takes purification to it.

The invention discloses a method of implementing an automatic control and storage device used for collection of natural rainwater or rainfall runoff, relating to the fields of environmental protection and water supply and drainage work. According to the invention, by a single-chip microcomputer control device, parameters such as rainfall, rainfall time or flow are taken as trigger conditions, rainwater of different characteristic stages in a rainwater collector can be stored into different independent sampling bottles by automatic control. The rainwater collector is connected with a submersible pump to collect the rainfall runoff, and also connected with a rainwater receiving funnel to collect the natural rainwater. A distributor on the rainwater collector can automatically fill the rainwater in the rainwater collector. The device has the characteristics that firstly, the device is suitable for the fields and occasions without an alternating current power source, remote transmission of data can be automatically controlled, and a possibility of unattended automatic collection of rainwater sample in the fields at night can be achieved; secondly, the rainwater of different stages can be automatically collected according to the given rainfall or time, and the device is suitable for monitoring the change of water quality of the rainwater along with factors such as rainfall and time; thirdly, rainwater under various conditions such as natural rainwater and rainfall runoff at different catchment areas can be collected.

The invention provides a method for setting a city initial rainwater interception standard. The city overflow pollution event reduction efficiency and the rainfall pollution reduction efficiency are counted, and high-efficiency areas of the city overflow pollution event reduction efficiency and the rainfall pollution reduction efficiency are found; and required initial rainwater interception rainfall is obtained and enabled to meet requirements of the high-efficiency areas, the flood prevention standard and the water environmental capacity. According to the city initial rainwater interception standard set with the method, initial rainwater with higher pollutant concentration can be intercepted effectively, so that pollution loads of rainfall runoffs to the water environment are substantially reduced.

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 discloses a functional rainwater garden applicable to a sponge community. The functional rainwater garden comprises a pre-percolation layer, a water storage layer and an overflowing facility, wherein the pre-percolation layer comprises an annular edge slope arranged at the periphery of the garden; a zeolite-active carbon filtering system is laid on the annular edge slope; a part, far away from the garden, of the annular edge slope is higher than a part close to the garden; the water storage layer comprises a covering layer, a planting soil layer, a percolation layer and a filling layer which are arranged in sequence from top to bottom; an overflowing pipe of the overflowing facility penetrates into the water storage layer along the vertical direction; an overflowing hole of the overflowing facility is higher than the water storage layer. According to the functional rainwater garden, a multi-grade percolation system composed of the pre-percolation layer, an active carbon layer and the water storage layer has the effects of filtering, precipitating, permeating and adsorbing rainfall runoff, carrying out ion exchange, biodegradation and plant absorption and the like, and pollutants including heavy metal, organic matters, nitrogen and phosphorus and the like in the runoff are reduced, so that absorption and purification of the runoff are realized; water for greenbelts is reduced, and urban waterlogging and municipal drainage pressure are alleviated; a heat island effect is alleviated and an ecological city is constructed.

An artificial rainfall runoff and soil water motion simulation experimental system comprises a rainer, a runoff and soil water forming device, a water drainage device and a runoff volume measuring device. The rainer comprises a water supply device and a raindrop forming device; the water supply device adjusts water outlet strength by an adjusting valve and a flow meter; the raindrop forming device is a group of pipes with holes; the runoff and soil water forming device is a vertical container with a soil layer; the group of pipes with holes is arranged on the top of the vertical container and can be adjusted in a lifting manner; and the container comprises an inner wall on the inner layer and an outer wall on the outer layer, the inner wall consists of a water permeable steel wire gauze, the outer wall is made of a transparent material, the inner wall and the outer wall are connected with each other by a water impermeable layering steel plate, the water drainage device is arranged below the soil layer, a water leading pipe which is connected with the runoff volume measuring device is arranged outside the container, and the runoff volume measuring device performs data processing and operation by a computer. The artificial rainfall runoff and soil water motion simulation experimental system is convenient to carry, high in experimental efficiency, accurate and fast in operation and high in adaptability.

The invention provides an ecological grass planting trench for cities with rich water resource, which is arranged on one side of a sidewalk road. The ecological grass planting trench sequentially comprises a vegetation layer, a planting soil layer, a building block brick layer, a water permeating and discharging pipe and a gravel layer from top to bottom. The ecological grass planting trench is arranged on one side of the sidewall road and used for collecting rainfall running water on the sidewall road, the pollutants in the running water can be reduced, and a purpose for locally purifying the running water and controlling the pollution of the running water can be achieved; the ecological grass planting trench is arranged between the sidewall road and a green land, so that not only is the landscape not influenced, but also convenience in construction can be realized; the rainfall running water is stopped in the gravel layer and gradually and slowly permeated, finally the water content of the soil of the green land is replenished, the rainfall running water can be completely absorbed and purified, and the water for irrigating the green land can be reduced; the lower end of the water permeating and discharging pipe is connected with a rainy water opening or a rainy water well, the other end of the water permeating and discharging pipe is closed, so that the collected rainfall running water on the sidewalk road can be collected into the rainy water opening or the rainy water well, and a purpose for reducing the rainfall running water and postponing the flood peak can be achieved.

The invention relates to a green community impact resistance rainwater ecological utilization system. The green community impact resistance rainwater ecological utilization system is characterized by comprising a building rainwater pipeline, a water drainage side ditch, an abandon flow well, an infiltration well, a downwards concaved type greenbelt, a grass-planting shallow ditch, a landscape water body, a water suction pump, a sparge pipe and a ground hydrant, wherein the upper end of the building rainwater pipeline is communicated with a roof rainwater outlet, the lower end of the building rainwater pipeline is communicated with the water drainage side ditch, the water drainage side ditch is paved along the boundary between the community harden ground and the downwards concaved type greenbelt, the abandon flow well with a rainwater storage and rainwater infiltration structure is arranged in the downwards concaved type greenbelt, an infiltration type backfill soil layer is arranged on the bottom of the downwards concaved type greenbelt, the landscape water body is located in the lowest position of a community and in a pond structure form or a channel structure form, and a rainwater utilization structure is formed by the water suction pump, the sparge pipe and the ground hydrant. The green community impact resistance rainwater ecological utilization system resolves the problem of the impact to an urban sewerage system caused by rainfall-runoff and the problem of pollution to municipal discharged water caused by rainwater in an initial stage, and has outstanding social benefit, environment benefit and economic benefit.

The invention discloses an ecological road engineering system, and belongs to the technical field of city road building. A carriageway and a non-motor way are each provided with a water-permeable bituminous pavement, namely a porous bituminous pavement, the porosity is higher than 20% after compaction is carried out, and drainage channels can be formed inside a bituminous mixture. Rainfall runoff on the pavements is collected into water storage devices embedded into a medium divider and a lateral divider and is gradually and slowly released to surrounding soil, and therefore the growth requirement of plants is met. By means of the ecological road engineering system, self-organization irrigation of the green belt plants is completed, the manual irrigation cost is reduced, and water resources are saved; soil irrigation is more thorough, a small amount of manual irrigation and a small amount of rainfall enable water to difficulty reach a soil layer with a certain depth, and therefore growth of tree root systems is not facilitated; meanwhile, a real-time monitoring system provides scientific data information for maintenance and effective detection of the ecological road engineering system; manual energy resources and power input are not needed in the complete system, the operation and maintenance cost is low, and the practical value is achieved; and through practices in one year, the system better runs, and the popularization value is achieved.

The invention discloses a method and a device for monitoring the rainfall runoff pollution of expressway pavements. The method comprises the following steps of: based on the flow measurement principle of an open channel, arranging a water measurement weir trough at a runoff discharge opening of an expressway pavement to draw shallow waterflow on the pavement into the water measurement weir trough to form steady open channel waterflow; arranging an ultrasonic flow sensor above the water measurement weir trough, and measuring the water level height in the water measurement weir trough in a non-contact mode to form a water level signal; transferring the water level signal to an automatic water quality sampler, and realizing the conversion and flow calculation of the water level signal of the weir trough as well as the display and the storage thereof by the water quality sampler; and utilizing a built-in peristaltic pump and a program control function of the water quality sampler to finish the time sampling of the runoff at the same time so as to successfully realize the real-time continuous monitoring and automatic monitoring of rainfall runoff pollution of the rainfall-runoff whole process of the expressway pavements.

The invention discloses a runoff predicting method. The method comprises the following steps of: establishing a rainfall runoff yield model; carrying out parameter calibration on the rainfall runoff yield model by adopting rainfall and runoff data of farmland or a region obtained through observation, and determining a runoff yield influence coefficient K of antecedent rainfall and a rainfall initial loss value Id under the condition that no antecedent rainfall exists for a long time; and acquiring the daily rainfall P of a current day and the actual daily rainfall Pi of an antecedent i-th day of the farmland or region, and obtaining surface runoff Q according to the rainfall runoff yield model. The method disclosed by the invention has the advantages that higher surface runoff prediction accuracy is obtained while less monitored data are adopted.

The invention relates to a quantitative evaluation method for water and sand reduction effects of erosion and torrent control work. The quantitative evaluation method comprises the following steps: performing digital processing on a terrain; acquiring data of soil and water conservation measures; acquiring and processing other data; calculating water and sand; judging; transmitting variable parameters; performing model parameter calibration and model verification; setting soil and water conservation scenes; generating water and sand process data in different soil and water conservation scenes; analyzing and calculating soil and water conservation effects of the different soil and water conservation scenes; and comparing the effects, and completing the operation. According to the quantitative evaluation method, the data of the soil and water conservation measures of slope surfaces and other hydrological and meteorological data are collected, grid DEM (Dynamic Effect Model) data of different resolutions or contour strip data is adopted as a platform, real water and sand physical process of a hill is adopted as a view, the coupling simulation calculation ability of slope rainfall-runoff and erosion-sand process is achieved, soil and water conservation situations of the slope at different stages are compared and analyzed on premise that the water and sand process is precisely calculated, and thus the effects of the soil and water conservation measures can be very precisely acquired.

The invention discloses a campus rainwater ecological cleaning integrated-processing method and an ecological cleaning integration system. The method comprises the following steps: 1) establishing an integration processing system for processing campus rainwater in a campus in advance; 2) selecting a proper processing method according to ecological purification conditions of different water bodies in the campus; and 3) finally collecting rainwater processed in the step 2) to a landscape water body in the campus, or discharging into a river in the campus, or collecting into the underground water layer of the campus. The system comprises an undercurrent type artificial wetland system for processing campus initial-stage rainfall runoff, a shoreland-area closure system for processing campus storm runoff, an ecological floating bed-aeration plug-flow system for processing campus natural revetment river water body, an artificial waterweed-micropore aeration system for processing campus hard revetment river water body, and a biomanipulation-fountain aeration system for processing campus enclosed pond water body. The beneficial effects comprise that the purification effect is good, the cost is low, the resource utilization rate is high and the purification effect is lasting.

The invention relates to a source retention and purification system for a composite flat table top of a large and intermediate riverway, wherein, an interception cross trench the cross section of which is a trapezoid wide on the upper part and narrow on the lower part is arranged on a joint of a riverway slope and a composite platform; gravels with different grain diameters are filled into the composite platform layer by layer from far to near according to the distance with the middle of a river to respectively form a round gravel layer, a mediate gravel layer and a fragmental gravel layer; concrete bricks are laid on the top of the composite platform; one side of the composite platform on the waterfront is provided with a slope waterfront; nonfines concrete blocks are laid on the slope waterfront; and planting is performed on the slope waterfront in turn according to the depth and the height of the water to form a submerged plant community, a floating plant community and an emersed plant community. The source retention and purification system has the advantages that: rainfall runoff surface source pollutants can be retained and purified through the action of the interception cross trench, herbal plants, the gravel layers and aquatic plants on the waterfront of the composite platform, thereby a suitable living environment is created and the integration of the paddling amusement function, the flood carrying function, the surface source retention and purification function and the ecological function of a composite riverbed of the large and intermediate riverway is realized. Moreover, the source retention and purification system has the advantages of simple structure, convenient construction, stable function, low cost and convenient use.

The invention discloses a method for measuring the flow and the mud content of an artificial rainfall runoff plot, which specifically comprises the following steps of: (1) selecting an appropriate slope in the wild as a test site, and preparing a water source and a power source; (2) surrounding the test site into a corresponding runoff plot by using baffle plates; (3) installing an artificial rainfall device and a surface slop runoff and mud content measurement instrument; and (4) adjusting rainfall intensity within a time period, and monitoring the parameters of flow and mud content of the runoff plot in the rainfall erosion process in real time. The invention also discloses a control system of the measurement method. By using the method, the flow and the mud content of the runoff plot can be recorded in real time. Moreover, the method has great mobility, the measurement effect closest to natural is achieved according to different surface conditions and site measurement, and a data basis is established to quickly acquire the soil erosion modulus of development and construction projects.

The invention discloses an urban river surge flood control and drainage dynamic forecasting control method. The method comprises the following steps that firstly, real-time rainfall data in a drainage basin is collected; secondly, the real-time rainfall data is transmitted and received through GPRS communication; thirdly, an underlying surface type is determined according to a satellite image, and CN values of all areas are obtained through checking according to the underlying surface type and a CN experience value table; fourthly, the volume of a flood is calculated based on a drainage basin rainfall-runoff model; fifthly, a water surface profile and the drainage volume of a pump station are calculated and forecast based on a river surge one-dimensional water flow mathematic model for coupling water gate overflowing and drainage of the pump station; sixthly, the volume of river surge flood propagation and drainage hydrological parameters are forecast in real time. By means of the urban river surge flood control and drainage dynamic forecasting control method and system, the river surge flood control and drainage situation can be effectively, accurately and dynamically forecast in real time, and urban river surge management and design can be easier.

The invention discloses a simulation test device and a test method for grassed swales. The device comprises a runoff generating device, a runoff flowing device, a runoff collecting device and a monitoring device, wherein the runoff flowing device comprises a V-shaped slot and an angle adjusting structure for adjusting included angles between the longitudinal slope of the V-shaped slot and the twoside faces of the V-shaped slot; the two side faces of the V-shaped slot are provided with a plurality of sampling holes; the bottom of the V-shaped slot is provided with a supporting structure; the V-shaped slot is filled with soil; and the surface of the soil is provided with a surface treatment layer. Testing water with different contaminant concentrations is prepared and different hydraulic loads and flow rates are set according to the purposes of the tests; and the influence of different earth surface measures on the utilization efficiency of the grassed swales and the runoff contaminantregulation can be known from the observation of soil moisture and the monitoring of surface water quality and contaminant concentration of soil solution. Thus the device and the method have great significance for water conservation and municipal rainfall runoff contamination.

The invention discloses a rainfall runoff forecasting system. An innovative rainfall runoff forecasting technical scheme is adopted, short, medium and long term rainfall runoff forecasting can be achieved, the real-time flood forecasting process can be displayed in forecasting, which is beneficial for accurately estimating the flood peak, the flood volume and the process of flood, the processes of discharge out of a reservoir and the water level are simulated in the forecasting process, short, medium and long term runoff forecasting scheduling including real-time flood forecasting of a user is achieved, and the problems that at present, the forecasting process of most runoff forecasting software is too short, and the medium and long term forecasting function is poor are solved. The system comprises a water regimen database, a user parameter configuration module, a rainfall runoff forecasting and calculating module, a forecasting result statistics module and a forecasting graph module. The system has the automatic forecast correcting function and is not provided with a gauging station and capable of achieving real-time rainfall flood forecasting as well, software and hardware cost of the system is greatly reduced, and the problem that most small and medium-sized reservoirs, hydropower stations and some large and medium-sized hydropower stations are short of medium and long term forecasting is solved.

The invention discloses a green belt drainage channel artificial wetland device for treating rainfall runoff pollution of a road. The device comprises a tank body, a packing layer and a wetland plant which is planted on the surface layer of the packing layer, wherein a water collection tank is formed at the bottom of the tank body; the packing layer is arranged on the upper part of the water collection tank in the tank body; the water collection tank and the packing layer are partitioned from each other through a perforated filter board; a gravel layer, a sandy soil layer, a blast furnace slag and lime stone mixing layer, a fine stone layer and a rubble layer are arranged on the packing layer sequentially from top to bottom; a perforated water distribution pipe is arranged on the surface layer of the packing layer; and a filter screen is arranged at a water inlet of the perforated water distribution pipe. The wetland device has multiple functions such as a screen belt landscape function, a grass planting drainage channel drainage and decontamination function, a vertical downstream wetland treating function, a stored water and rain water recycling function and the like; and a wetland tank body is used as a green belt tank body and a drainage channel tank body simultaneously, so that the device saves the floor area of an individual building, reduces construction working amount and has lower economic input.

The invention provides a method and a device for implementing primary rainwater closure in a municipal network system. In the method, primary closure rainwater at each rainwater port in a water catchment area is taken as an object, and a floating ball control chamber and a main flow-splitting chamber are arranged on two sides of the rainwater port. When a rainfall runoff is formed, heavily-polluted primary surface chemical runoff is subjected to quantitative closure to the municipal sewage pipe network by using the difference between the two chambers and a rainwater inspection well in vertical elevation. A floating ball control valve is arranged at a primary rainwater inlet of the main flow-splitting chamber; the floating ball water level in the floating ball control chamber controls the opening and closing of the floating ball control valve; the flow-splitting effluent flows into the municipal sewage inspection well in the neighborhood; and the split flow can be realized by the effective volume of the floating ball control chamber and the opening and closing of the floating ball water level control valve. By integrally arranging the primary rainwater closure and the rainwater port, inspection well and other closure devices in the municipal network system, the method and the device can effectively realize the closure control of the primary polluted rainwater under various working conditions of actual rainfall.

The invention discloses a rainwater garden system for community rainwater flow diversion, peak clipping and ecological purification. The rainwater garden system comprises a community roof rainwater flowing-through facility, a reverse U-shaped buffer flow division pipe, a green land rainwater garden facility and a rainwater well, wherein the community roof rainwater flowing-through facility is connected with the green land rainwater garden facility through two paths; one path is the direct connection with the green land rainwater garden facility, and the other path is the connection with the green land rainwater garden facility through the reverse U-shaped buffer flow division pipe; and the green land rainwater garden facility is also connected with the rainwater well. The reverse U-shaped buffer flow division pipe is used, and a water storage layer, a covering layer, a planting layer, a transition layer, a filling material layer, a water discharge layer and matched pipelines which are sequentially and downwards provided by the downward green land rainwater garden facility from the ground are used, so that the rainwater garden system has the effects of early-period rainwater processing, rainfall runoff flow division, peak clipping and purification regulation and control.