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Wenzhou’s“Sponge City”Planning Approved
【Fonts: Large Medium Small 【Source: Wenzhou·China 【Date: 2018.08.07】

It's a sore point with many cities to become inundatedafter the attack of a rainstorm. However, if a city can absorb water when it pours and “release” water during the drought like a sponge, the odds“to overlook the sea in the city” may come to naught in the near future. Recently, “Wenzhou’s Sponge City”planning(hereinafter referred to as “The Planning”) was approved by the municipal government. Wenzhou will construct a natural ecological pattern of a sponge city featuring“ 1 large ecological chain around the city centers, 3 mountain ecological areas, Oujiang River System and 4water systems,4 urban ecological areasand 3 ecological reservoirs” so as to achieve the overall goal of “no ponding during light rains, no water logging during heavy rains, no black and stinking water, and the urban heat island effect attenuated” in the central city areas.

Sketch Map of Metropolitan Green Belt of Wenzhou’s Sponge CityPlanning


Key sponges mainly include mountains, reservoirs, wetlands etc.


The regions of Wenzhou’s Sponge City Planning include Lucheng District, Longwan District, Ouhai District, the Administrative Jurisdiction of Dongtou District and Oubei Region.


“The Planning” puts forward that key sponges in Wenzhou’s central city areas mainly include mountains (Daluo Mountain, Chuitai Mountain, Longniang Mountain, Puguajian Mountain, Shengmei Mountain etc.), reservoirs(Zeya Reservoir, YangyiReservoir, TianheReservoir, etc.), wetlands(Sanyang Wetland, Tanghe Network of Rivers), major river systems, greenways(the greenways along the Oujiang River,OuhaiAvenue, Jinliwen expressway,the high-speed rail, Yongtaiwenexpressway, Binhai Avenue, and coastal expressway etc.), islands (Qidu Island, Lingkun Island,DongtouEcological Islands, etc.), and large-scale green parks, green buffers and farmlands.


According to “The Planning”, Wenzhou will gradually build a sustainable rain and flood control system through the construction of the key regional sponge cities to clearly set out the spatial pattern of the urban natural ecology, to improve the water quality of the water body, and to enhance the overall capacity of the urban flood storage. By 2020, more than 25% of the city’s built-up areas will reach the goal of constructing a sponge city. And by 2030, more than 80% of the city’s built-up areas will reach the goal so as tobuild Wenzhou into a sponge city that is green, natural, ecologically livable, safe and elastic, a model for the watery and livable cities.


Roof greening is encouraged to store and purify rainwater


The main measures for the construction of a sponge city are rainwater wetland, grass planting ditch, vegetation buffer zone, biological detention facilities, water permeable brick, green roof, sinking greenland, initial rainwater discarding facilities, wet pond, regulating pool, reservoir and so on. In order to standardize and guide the recent construction of a sponge city in Wenzhou, “The Planning” has formulated the general rules for the classification of land use.


“The Planning” provides thatthe landscape water and green land in buildings and sites should have the function of green water storage or mediation; the landscape water body can be built into a multi-functional ecological water body which integrates rainwater storage, water purification and biological landscape; roof rainwater and road rainwater need to be reasonablyconnectedwith and guided into the ground ecological facilities, and indirect drainage should be adopted at the bottom of the rain leader downspout; roof greening is encouraged to store and purify the rainwater, with rainwater storage tanks (pools) set up around the buildings with roof greening to collect rainwater from raining pipes for recycling; the parking lot of buildings and sites should regulate, store and purify the runoff from the parking lot by the green beltsthat separate the parking spaces, and the parking field pavement should be water permeable;rainwater storage facilities should be set up when the total runoff control of buildings and sites can not meet the requirements. In case of a river, a lake, a pond, a wetland, or a low-lying land in or near buildings and sites, it can be used as astorm detention facility without any need of setting up artificial pools.


The recently to-be-constructed key areas cover 79.3km²


“The Planning” suggests that the construction scheme should,on the basis of evaluating the feasibility of the construction and reconstruction of various sites, put forward the construction tasks of a sponge city for residential areas, roadsand squares, parks and green areas, waterlogging and disposal of black and stinking water, and the ecological restoration of rivers and lakes and so on.


“The Planning” has determined the key areas of recent construction, which covers a total area of about 79.3 km² and accounts for 26.4% of the planned area, including the Central Green Axis (4.8 km²), the CBD region (9.6 km²), Sanyang Wetland (11.7 km²), Wenzhou ZhenanSci-tech City (5.1 km²), Qidu Island (7.5 km²), the Oujiang River Estuary Area (9.4 km²), and the Economic & Technological Development Zone (20.1 km²), and OuhaiAdministrative Center - Zhanqian - Hengyuregion (11.1 km²).The S1 line, the railway line, West Line of Wenzhou Rounding Expressway etc. are also included with the construction area reaching and exceeding the requirements of sponge city construction target of the country and the province.

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