The Study Of Low Mountain And Hilly Mountainous Park Stormwater Management Base On LID Technique

The acceleration of urbanization process and the explosion of hardening rate of site lead to two problems,on the one hand,cities need to face water shortage on the other hand,there’s excessive rain making the sea seen in cities.Stormwater problems have an important impact to the safety,suitability,convenience of urban life in recent years.This article focuses on the analysis of rain and flood in low mountain and hill park,presenting the stormwater design methods of rain and flood in low mountain and hilly park based on the concept of LID.Then the stormwater system of sites with low mountains and hills was built based on the technology of LID,and the stormwater design practice was made with an example of Shuyang Hanshan Park.The main work and achievements are as follows:Firsrly,through the study of low hill park and flood characteristics,this paper summed up the basic characteristics of parks with low mountains and hills in our country were analyzed,such as the complicated landforms,uneven ground covers,local ecological fragility,lower hard ground,etc.Stormwater problems were analyzed,such as the complex of hydrological process of low hills park,floods and other environmental hazards,unsynchronized landscape construction and the rain flood design,and low level of rainwater utilization.Secondly,based on the characteristics of field rain and flood,combined with the same case analysis,the traditional stormwater intelligence,this paper put forward the stormwater management methods based on the site hydrology and LID technology,these methods were determination of objectives and principles,site condition analysis,analysis of site GIS hydrological simulation,extraction of stormwater key points,proposed site strategies,construction site characterization and LID stormwater system based on the goal and principle.A series of rainwater management strategies are proposed,including the rainwater structure combing based on the natural runoff of rainfall,the combination of flood discharge and infiltration facilities,and the rainwater source management based on flood discharge.Combined with the multi-level closure to reduce the erosion of the ground at the same time to carry out the initial filtration of water;catchment process multi-level storage,improve water quality,increase the surface rainwater reuse rate;combined with the landform to create a different type of water;Water facilities,reserves of fire and conservation of water and so on.The rain and flood system based on LID is constructed,which includes four subsystems: basic storage facilities,safety facilities,rainwater resource facilities and sponge science and entertainment facilities.Thirdly,the rainwater flooding system of Han Shan Park was constructed by combining the rainwater system and the rainwater management method.Through the research of Han Shan site and GIS hydrological analysis,the key points,lines and faces of pits,water flow nodes,flood discharge lines,water storage points and water networks are extracted,and the design strategies are put forward respectively.Then,taking Han Shan Park as an example,the landscape design of rainwater landscape is put forward,and the landscape design strategy of rainwater landscape is put forward,which is based on landscape design of Han Shan Park and rainwater system of Han Shan Park,which includes the rainwater structure based on the natural runoff of rain,And its detailed design methods of rainwater management of Hanshan Park including the integrated design design of permeability and water storage,the combination of mountain flood and river closure,the multistage storage of rainfall runoff,the waterscape design of rainwater utilization and the design of mountain watershed measures were put forward.