China’s large scale urbanization started around the 1980’s with a rapid rise in the urban population from 36.22% in 2000 to 54.77% in 2014. Consequently, more cities are facing challenges associated with urban sustainability and urban water issues such as aging/outdated water and wastewater infrastructures, urban flooding, combined sewer overflow, water quality deterioration, water scarcity, and a high frequency of extreme weather.
Among these, urban flooding is one of the most frequent and hazardous disasters that can cause enormous impacts on the economy, environment, city infrastructure and human society
To solve the problem, since 2015, P.R. China has been implementing a national "sponge city" policy, with the objective to achieve an overall planning goal of control the total volume of annual runoff, the peak value of run off, pollution control and reuse of stormwater resources, but also supporting the dissemination of nature-based solution in urban planning.
The Hedong new area in Anzhou district ofMianyang city (Sichuan province), was selected by the Sichuan Province to implement a "sponge city" pilot project. This Sponge-city pilot project in Hedong Ecodistrict, is located on a 5.4 km² left bank of the Anchang River. It will welcome more than 80.000 inhabitants by the coming 15 years.
The project aimed at supporting the flood risk assessment of the eco-district, and providing technical recommendations to take into account flood risks from extremes weather event (dikes overflows / breakage, runoff from surroundings hills), and disseminating technical guidelines for the construction of 1) a drinking water plant, and 2) resilient infrastructures (5 km long green corridor, used as flooding buffer zone, and a drained road).
The project is also seeks to disseminate nature based solutions guidelines in order to build water Sensitive Urban Design and integrates water cycle management into the built environment.
This project is supporting the adaptation to climate change of Mianyang city, by building some resilient infrastructure. It will also provide clean drinking water to 80 000 citizens, and offer additional recreational and public space areas for a better living urban environment.
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