Sponge city is a new generation of urban rainwater management concept, which can also be called "water elastic city". The international term is "low-impact development rainwater system construction". Absorb water, store water, seep water and purify water when it rains, and "release" the stored water for use when necessary.
The extensive application of "sponge city" materials shows excellent characteristics such as water seepage, compression resistance, wear resistance, anti-slip, environmental protection, beauty, comfort and easy maintenance, sound absorption and noise reduction. And it has become a "breathing" urban landscape pavement, which has also effectively alleviated the urban heat island effect and stopped the urban pavement from heating up.
0 1 & gt； & gt We provide consulting services for sponge city construction.
Sponge rainwater not only has more than 10 years of experience in rainwater control and comprehensive utilization projects, but also provides practical planning, design and implementation plans for sponge city construction by integrating extensive domestic and foreign cooperation platforms and experienced expert teams, and has participated in the declaration and construction of more than half of the pilot cities.
design concept
To build a sponge city, we must first change our concepts. The traditional urban construction mode is full of hardened roads. When it rains heavily, it mainly relies on "gray" facilities such as pipes, canals and pumping stations to drain water. Taking "quick drainage" and "terminal concentration" control as the main planning and design concepts often leads to waterlogging when it rains, and drought and waterlogging turn sharply. According to the Technical Guide of Sponge City Construction, green measures such as grass ditch, permeable brick, rain garden and sunken green space will be given priority in urban construction, and the main planning and design concepts of "slow drainage and slow release" and "scattered source" will not only avoid floods, but also effectively collect rainwater.
supporting facilities
To build a sponge city, there must be a "sponge body". Urban "sponge" not only includes rivers, lakes, ponds and other water systems, but also includes urban supporting facilities such as green spaces, gardens and permeable pavements. Rainwater permeates, stagnates, purifies and recovers through these sponges, and finally the remaining runoff is discharged through pipe networks and pumping stations, which effectively improves the standard of urban drainage system and relieves the pressure of urban waterlogging.
At present, the contradiction between urbanization development and ecological environment is increasingly prominent. In order to create a healthy, green and livable urban water environment, China proposes to build a rain and flood management system that follows the natural drainage law-sponge city.
So, how to build a sponge city? Let's learn about the low-impact development that is most closely integrated with landscape design in sponge city.
Low-impact development can effectively control the total runoff, flood peak runoff and runoff pollution mainly through rainwater infiltration, storage, transmission, interception and purification.
If the traditional urban development cuts off the natural circulation route of rainwater, then the low-impact development is to use a series of landscape and engineering technologies to make urban drainage simulate the natural absorption, storage and evaporation of rainwater and make the urban drainage system follow the rainwater circulation law.
For a long time, Shenzhen Sponge Rainwater Utilization Technology Co., Ltd. has been committed to studying the concept of sponge city and its application in landscape design. The research shows that the technical standards of sponge city are not uniform and there are many measures, which is not conducive to dissemination and popularization. Therefore, in this paper, according to the sequence of rainwater treatment in sponge city, we can divide it into three categories, namely, "water collection measures" to collect rainwater, "water storage measures" to store and filter rainwater implicitly, and "water use measures" to effectively use rainwater.
02>& gt We advocate source management and ecological management.
The guiding ideology of general rainwater system design is to eliminate surface runoff formed by rainfall in time and quickly. However, the utilization of rainwater runoff is not considered in the process design. Therefore, on the one hand, it is to invest in the construction of a huge rainwater drainage system to discharge urban rainwater runoff, on the other hand, the city lacks groundwater recharge and fresh water resources. That is to say, rainwater, as a natural water resource, has changed from water resource to water pollutant through our current management mode, and has become a very large pollution source that spreads to the periphery of the city.
We believe that rainwater is a sustainable resource. Starting from the source, according to different underlying surface characteristics and engineering requirements, different rainwater collection and treatment methods are adopted to realize local infiltration and utilization of medium and small rainfall, local detention of large and extra-large rainfall, delayed discharge after detention, and use delayed peak shifting to reduce the pressure of urban drainage pipe network.
03>& gt We help to provide special planning for sponge city.
The traditional construction or reconstruction project adopts the engineering mode of "pipe network-water system" for rainwater runoff, and directly discharges rainwater into the urban water system. Neither relatively clean rainwater is used, nor non-point source pollution is effectively controlled on the spot. The solution of decentralized management of urban rainwater is not to discharge rainwater outside the area, but to concentrate rainwater in the area, using the public space in the area to retain, infiltrate and utilize rainwater, and only to discharge excess rainwater into the urban drainage pipe network to reduce the pressure on the urban drainage pipe network.
In the process of high-speed urbanization in China, if rainwater infiltration and comprehensive utilization are considered in the design of rainwater pipeline system and land use planning, and rainwater resources are reasonably and fully utilized, it can not only alleviate the urban water crisis, but also increase the water content in the soil and adjust the climate, thus improving the urban ecological environment, reducing the required rainwater pipeline capacity, alleviating urban waterlogging, reducing water pollution and increasing fresh water resources.
We have a first-class expert team in the industry, which can comprehensively consider various factors, fully cooperate with special planning such as urban master planning, drainage and waterlogging prevention planning, and water environment management planning, and provide systematic planning and design suggestions. Make the planning results more reasonable and feasible, and realize the goals of pollution control, water resources balance and drainage and waterlogging prevention.
04>& gt We provide project design and management.
The problem of water resources varies from place to place. According to the construction requirements of sponge city, the design objectives of different projects are also different. Generally speaking, rainwater collection and treatment methods are different for different underlying surfaces. Through the calculation of rainfall, the corresponding management mode is adopted to realize the detention and utilization of small and medium rainfall, the detention of large and extra-large rainfall, the delayed discharge after detention, and the use of delayed peak shifting to reduce the pressure on urban drainage pipe network.
We have a professional design team with thousands of project design experience, which can closely connect the rainwater system with all aspects of urban management such as roads, buildings and landscapes. We have the ability to make full use of urban public spaces (roofs, green spaces, squares, parks, etc.). ) and turn it into an infrastructure with rainwater management function through the management strategy of rainwater runoff. We control both water quantity and water quality, form a distributed management network from point to surface, treat and utilize rainwater runoff before it reaches the receiving water body, reduce the total amount of runoff, improve the water quality of runoff, replenish groundwater and help the construction of sponge city.