Sponge city refers to the strengthening of urban planning and construction, which fully exerts the effects of rainwater absorption, infiltration, and slow-release of ecosystems such as construction, roads, oasis, and water systems, and effectively controls rainwater runoff to complete natural accumulation, natural penetration, and natural purification. Urban development methods.
Fengxiang Wetland Park is in the middle of the Meishe River. Just over a year ago, it was still a building market for various illegal constructions and a spoil ground for storing construction waste. The reporter saw here that the land and waters of the park have now been completed. Public facilities such as hydrophilic channels, public toilets, and seats are under intense construction. The originally dirty urban-rural junction is changing into a beautiful city scene.
Xie Song introduced that using a large area of green belt in Fengxiang Wetland Park, a sponge system was built, which can store and purify rainwater, delay peak runoff, and reduce the pressure of river drainage. According to calculations, from Fengxiang Park to the upper Shapo Reservoir, the space capable of holding rainwater will reach 500,000 cubic meters.
Xie Song introduced that the volcanic rock retaining walls, hydrophilic planks and green plants with water purification effects in the park, the permeable concrete road and grass planting ditch can play the role of seepage, storage, stagnation and drainage during rainfall.
Currently, the second phase of the ecological revision is underway in the management of the Messer River. According to Wang Chen, deputy director of the Institute of Resources and Energy of the Urban Planning and Planning Institute of China, the second phase of the project will pass the order of residential quarters—municipal roads—parks oasis—river channels, which will be useful for controlling the non-point source pollution and water accumulation in the initial rainwater. Through the sponge reconstruction, the rainwater confluence roads will be blocked, the rainwater will be diverted to the park oasis, and the slope on the side of the square along the Meishe River will be set so that when the square water volume exceeds a certain height, it can be drained straight into the river to ensure that the square does not accumulate water . In addition, during the reconstruction of the Meishe River, the hard section was changed to a double section. The section was narrowed at normal water levels, and the flow velocity was increased to reduce pollution and sediment accumulation increase. At the constant water level, a grass slope water section was formed. Duplex cross-section drainage can only be added. According to calculations, under the standard of equal drainage, the water surface line of local rivers with multiple cross sections descended to 10 cm.
Zhang Qi, member of the Standing Committee of the Hainan Provincial Party Committee and Secretary of the Haikou Municipal Party Committee, said that it is necessary to rely on urban renewal to promote Haikou sponge cities and ecological correction operations, and to complete the healthy and sustainable development of Haikou while respecting nature, adapting to nature, and maintaining nature.