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How to build a sponge city in Guangzhou

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更新时间:2019年04月23日11:49:53 打印此页 关闭 Clicks: 464 Updated: April 23, 2019 11:49:53 Print this page Close

The sidewalk on the north side of the intersection of Tiyu East Road and Longkou West Road in Tianhe District has been repaved, and the sidewalk on the south side is still under construction. Construction workers at the site told reporters that the sidewalk paving materials and construction technology of this section are all based on uniform standards, and fine construction is carried out at the sidewalk corners, sidewalk guardrails, and sidewalk decorative manhole covers. Although the floor tiles laid on the sidewalk of Tianhe Road look like ordinary stones, the appearance of the bricks is a porous structure invisible to the naked eye, "like a sponge". The worker explained: "When it rains, a square meter of permeable bricks can absorb more than a dozen kilograms of water. After drinking, they will infiltrate into the ground. Normally, the water will be heated and transpiration, which will increase the humidity of the air and lower the temperature of the ground."

A layer of concrete is laid under the permeable brick , so even if the floor tiles can absorb water, the rainwater still cannot seep. What is going on? In this regard, the workers explained that if there is no concrete cushion, the water on the ground will pass through the permeable bricks. Direct penetration into the soil layer may cause accidents such as ground collapse in the future. Therefore, although the permeable bricks laid here have a certain water absorption, the need for anti-skid and support for compression must be considered.

This permeable pavement can be promoted in the parks, squares, and even the districts in the central urban area of Guangzhou. It can effectively reduce surface runoff and the cost is lower than general information. But the reality is that, because ideas have not yet spread, there are still very few locals in the central urban area that use this permeable material. In addition, in the densely populated old town, the roof is the best stage to play the "sponge city" concept. If there is no problem with waterproofing and load bearing, the roofs in the urban area can actually be replanted and beautified or made into small gardens to reduce rainfall.

In addition to Tianhe District, other areas in Guangzhou have also explored the construction of a "sponge city." In recent years, due to the construction of the subway, the road surface of Jiulong Road in Huangpu District is dilapidated and the traffic between them is sad. Recently, the reporter visited Huangpu Common Sense City and found that the original monotonous and messy landscaping of Jiulong Road was gone, the potholes and pavements were gone, and the broken roads and sidewalks were updated. It was replaced by a 100-meter span gate. Kilometres of shiny and shiny asphalt pavement, lined with hundreds of camphor trees, large-bellied kapok, fine-leaf palm kernels, and 30 species of perianths, are rich in color. The sidewalk is flat and wide, and the landscape is concise and concise. The overall vision is transparent and distinctive. Water-repellent and water-retentive materials are used for the renovation project. For example, permeable bricks and permeable concrete are used for the sidewalks and non-motorized lanes.

Waterlogging in Guangzhou areas

● Yuexiu completed the renovation of two flooded black spots in the past year

In recent years, the Yuexiu District has systematically transformed the flooded black spots, strengthened the dredging of the drainage network, and scientifically dispatched fortifications, which greatly reduced the incidence of urban waterlogging. In the first half of this year, a total of 786,900 meters of pipelines were cleared, 57,401 wells were cleared, and 2485 cubic meters of silt was removed, ensuring smooth drainage network in the area under its jurisdiction. In the past year, Yuexiu District completed the reconstruction of two flooding black spots in Zanlili and Dayali, which effectively eased the flooding problem.

● Panyu has completed the inspection of 8 town streets and the university city pipe network

Now Panyu District is carrying out related operations in accordance with Guangzhou's construction requirements for a "sponge city". The existing drainage pipe network in Panyu District is about 1284 kilometers, of which 661 kilometers is the rainwater pipe network. Most of the existing drainage pipe networks have been laid for more than 10 years. At present, Panyu District is in accordance with the guidelines for fragmentation and hierarchical management. The dredging and protection are respectively responsible for the district water affairs bureau, district water affairs company and the subordinate town (street). Panyu District has completed the drainage pipe network inspection operations in the major towns of Qiaonan, Shawan, Shijie, Dalong, Shilou, Dashi, Zhongcun, and Shibi. The next step is to further strengthen the protection of the drainage pipe network, continue to test the drainage pipe network in Panyu District by segmentation, and make engineering corrections to the defective pipe network year by year.

● Haizhu did not show large-scale long-term flooding this year.

According to the water affairs part of Haizhu District, the district incorporates the "sponge city" concept into the planning of new areas such as Pazhou Internet Innovation Concentration Zone and Guangzhi District, as well as the renovation and reconstruction of old urban areas, and micro-renovation of communities to actively do well in the rainy season. After establishing a drainage mechanism, implementing group gate control, scientifically dredging pipelines, and improving emergency rescue measures, since 2016, there has been no large-scale, long-term flooding in the entire region.

● None of the 26 flood-prone spots in the city of Liwan are on the list

The Liwan District plan implements the "Xiushui Liwan" plan for water construction during the "Thirteenth Five-Year Plan" period, promotes the construction of the "sponge city", and creates a characteristic ecological Lingnan water system. The active plan promoted the construction concept of the "sponge city" to be incorporated into the development and construction of Datansha. Together, they gradually reformed the pavement in the northern and southern regions with conditions to control rainwater runoff.

In recent years, in order to reduce waterlogging in urban areas, Liwan District has stepped up efforts to promote the drainage pipe network reconstruction in the Lichiwanyong watershed, and completed and put into use the drainage pipe network reconstruction projects such as the drainage drainage reconstruction project of the sluice box of the Upper West Pass and has been put into use. According to the flooding situation of the original black spot of waterlogging, the drainage time was evenly reduced by about 3 hours, and the drainage power was increased by 60%. In July of this year, the Municipal Water Affairs Bureau announced the city's 26 prone waterlogging spots, none of which was listed on the Liwan District, which completely got rid of the situation that the central old city must be flooded when it rains, showing the phased results of the reconstruction of the pipeline network.

At present, the construction projects under construction in Liwan District mainly include the flood control, drainage and water diversion project of Xiaxiguanyong, the drainage reconstruction project of Liandeng Community, and the project of improving the branch pipe of Xiaxiguanyong. After the project is completed, it will further improve the drainage capacity of the upper and lower Xiguanchong in the Lichiwanyong watershed, and gradually solve the problem of waterlogging in low-lying areas of the city.

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