A Study On The Applicability Of Stormwater Management Techniques For Roads In Suzhou From The Perspective Of Stormwater Resilience

The urban ecology has been improved somewhat by the sponge city policy,sustainable development and other concepts,but the sponge city construction objectives are a topic for the planning field in urban stormwater management.When its technical guidelines are graded directly from the regional level to the control of stormwater management on plots,or even urban areas,blocks and roads,the problem of homogeneous single indicators and poor implementation is common.As the nexus of economic and social activities within cities,roads are gradually becoming the main type of underlayment within cities,accounting for nearly 1/3 of the total urban area o f hard space,becoming the main rainfall receiving surface and surface runoff collection surface under rainfall weather,which in turn brings about problems of urban flooding,water environment pollution and water scarcity,especially in recent years when El Ni?o,La Ni?a and other anomalous climates have been frequent,triggering extreme rainfall weather phenomena in cities This has increased the pressure on cities to cope with environmental and stormwater problems,making the study of road stormwater management techniques particularly important.In the context of the above research,this paper attempts to take a stormwater resilience perspective,based on the technical requirements for low impact development of stormwater management facilities in the existing Technical Guidelines for Sponge City Construction,by simulating and calculating the ability of a site to cope with variable weather and to select stormwater management facilities for roads according to local conditions.The subject of this study is the main roads,secondary roads and feeder roads within the city of Suzhou,and the scope of the study is the city of Suzhou.The study first reviewed the relevant information on urban road stormwater management and utilisation at home and abroad,studied and analysed the suitability of classic cases at home and abroad,summarised and outlined the technical facilities and applicable conditions for urban road stormwater management,and provided reference for subsequent road applications in Suzhou.The road types in Suzhou are then categorised into sixteen road patterns according to the type and combination of sub-bedding surface based on on-site research and geographical information data processing.By calculating the integrated runoff coefficient and runoff control rate of the roads,the current stormwater abatement capacity of the research road sections was assessed.The final objective is to achieve a 10%-15%increase in the site stormwater dissipation capacity.Based on the road patterns in Suzhou,the technical methods of road stormwater management applicable to the different road patterns in Suzhou are proposed.Suggestions are made to select reduction facilities with the aim of reducing the site’s integrated stormwater runoff coefficient,given the limited spatial extent of road green space;and to give full play to the ecological advantages of roadside green space to achieve the desired effect of road surface runoff being dissipated by roadside green space.Although the practical applicability of the methodology used in this paper has yet to be verified,it can provide a reference for the construction of road stormwater management in Suzhou.