Recently, Hangzhou has won the "A" grade in the performance evaluation of the national sponge city construction demonstration city. As one of the key demonstration areas that Hangzhou strives to build, our district takes the "Asian Games Sponge City Area" as the blueprint, actively promotes the action of creating a green environment, summarizes and refines the experience of "big sponge + small sponge" integration and mutual coexistence construction, so that the construction of sponge city has become a reality from the concept to a sense of happiness within the reach of the citizens, and promotes the vivid practice of the Healthy Xiaoshan Action in urban construction.
Up to now, our district has completed the regionalization of sponge city construction with an area of 58.09 square kilometers.
The "little sponge" brings happiness around us
On a rainy day this year, Mr. Wang no longer worries about "getting his shoes wet as soon as he goes out". After living in the Media Village Talent Apartment in Hangzhou Asian Games Village, he found that the roads here seemed to "drink water". Although the manhole cover is not visible, the road surface quickly becomes dry even when it rains. This road of "no wet shoes" is a vivid embodiment of the concept of sponge city.
This year, our district released a systematic and global demonstration project to promote the construction of sponge city, covering 44 projects, sunken green space, green roof, rain garden, permeable pavement and other "small sponge" technology, which is widely used in parks, schools, municipal roads and residential areas, etc., to create a livable environment where "light rain does not wet shoes, and sponge becomes a bright spot".
The main gymnasium, natatorium and comprehensive training hall of the Hangzhou Olympic Sports Center, not far from the Asian Games Village, have been set up with low-impact development facilities such as sunken green spaces and green roofs to achieve rainwater purification and the development and utilization of non-traditional water resources.
"Rainwater storage tanks are arranged at the end of the outdoor stormwater pipe network, and the rainwater is collected and purified and can be used for green space watering and road washing." According to the relevant person in charge of the District Housing and Urban-Rural Development Bureau, through data calculation, the total annual runoff control rate of the Hangzhou Olympic Sports Center comprehensive training hall plot is expected to reach 75.04%, and the annual runoff pollution reduction rate can reach 63.7%; The total annual runoff control rate of the main gymnasium and natatorium of the Hangzhou Olympic Sports Center is expected to reach 75.82%, and the annual runoff pollution reduction rate can reach 65.4%.
On the north bank of the Qijia River nearby, a riverside park with a landscape area of about 80% is also a "small sponge". While collecting and absorbing the rainwater of the site itself, it can also absorb some of the excess rainwater of the municipal roads along the Olympic Sports Natatorium, Hangzhou Century Center and Comprehensive Training Hall, forming a continuous driving effect.
"Big sponge" makes the city more "water resilient"
In the area of the Asian Games Village, there is a central water axis that winds for nearly 3,000 meters. This is the "sponge city" construction demonstration project of the demonstration area of the Olympic Sports Expo Center in our district, which is connected with the upgrading section of the newly opened Pioneer River to jointly weave a "T-shaped water system", close to the Qiantang River, and build a solid flood control and drainage barrier for the Asian Games Village and its surrounding areas.
The huge project of flood control and drainage improvement project in the Asian Games Village and its surroundings is a typical case of the well-laid out regional "big sponge" system in our district.
The person in charge of Xiaoshan Environmental Group Investment Company explained the subtleties of the project: "We have adopted a strategy of 'external drainage, internal storage, and middle dredging', focusing on improving the flood control and drainage capacity of the Asian Games Village and the surrounding areas. According to reports, the "external discharge" is mainly to expand the Wubao Gate Pumping Station from the original 12 cubic meters per second to 50 cubic meters per second, and promote the area to "flow live water, no flooding and no waterlogging"; The "internal storage" project is the "central water axis" project, which takes into account the functions of drainage and storage at the same time; The "medium dredging" project is to realize the communication and connection between the newly opened river and the existing river through the combing of the existing river, so as to ensure the smooth flow of the river system in the region and meet the requirements of regional drainage.
Nowadays, the water network of the Asian Games Village extends in all directions like a bloodline, providing strong support for flood control and drainage and water resources introduction in the Asian Games Village area: in the non-rainy season, it can divert water from the Qiantang River into the city to beautify the water environment, and when the rainstorm comes, it can quickly start the pumping station forced drainage mechanism to effectively control the water level of the river and ensure that the water accumulation on the road can be quickly removed and the operation of the city will not be affected.
"A sponge city can bring a tangible sense of happiness to its citizens." The relevant person in charge of the District Housing and Urban-Rural Development Bureau said that next, our district will take the opportunity of promoting urban renewal to explore the mechanism, means and methods of systematically promoting the construction of sponge city in line with the actual situation of Xiaoshan, and further promote the construction of "sponge city" to a new level.