Results of the summarizing process for the arXiv paper: 2112.10347v2

Sponge city construction is a relatively new approach to urban stormwater management that has gained popularity in China. It involves the use of Low Impact Development (LID) techniques to effectively manage stormwater at the source, thereby reducing urban flooding and non-point source pollution while promoting rainwater resource utilization. Li Qian and colleagues developed a comprehensive evaluation system that uses the Storm Water Management Model (SWMM) and Analytical Hierarchy Process (AHP) method to quantify the benefits of different combinations of LID units. The system was applied to analyze five LID design scenarios for a sports center project in Guangxi, China with varying locations and sizes of bio-retention facilities, grassed swales, sunken green spaces, permeable pavement, and storage tanks. The results showed that the green scenario with 34.5% bio-retention facilities and 46.0% sunken green spaces had the best comprehensive performance in meeting requirements for 75% annual total runoff reduction while achieving good operation performance, rainwater utilization, landscape promotion, and ecological service functions. This optimal scenario was adopted for constructing the sports center project. Furthermore, this proposed evaluation system can be used not only for optimal selection but also for performance effect evaluation of LID practices in other sponge city projects. This study provides valuable insights into how LID techniques can be used effectively in sponge city construction projects to mitigate urban flooding while promoting sustainable water management practices.

• Sponge city construction is a new approach to urban stormwater management in China
• It uses Low Impact Development (LID) techniques to manage stormwater at the source
• LID techniques reduce urban flooding and non-point source pollution while promoting rainwater resource utilization
• Li Qian and colleagues developed an evaluation system using the Storm Water Management Model (SWMM) and Analytical Hierarchy Process (AHP) method to quantify benefits of different combinations of LID units
• The evaluation system was applied to analyze five LID design scenarios for a sports center project in Guangxi, China with varying locations and sizes of bio-retention facilities, grassed swales, sunken green spaces, permeable pavement, and storage tanks
• The green scenario with 34.5% bio-retention facilities and 46.0% sunken green spaces had the best comprehensive performance in meeting requirements for 75% annual total runoff reduction while achieving good operation performance, rainwater utilization, landscape promotion, and ecological service functions.
• This optimal scenario was adopted for constructing the sports center project.
• The proposed evaluation system can be used not only for optimal selection but also for performance effect evaluation of LID practices in other sponge city projects.
• This study provides valuable insights into how LID techniques can be used effectively in sponge city construction projects to mitigate urban flooding while promoting sustainable water management practices.

1. Sponge city construction is a new way to manage rainwater in cities in China. 2. It uses special techniques to control the water where it falls, instead of letting it flood the streets. 3. These techniques help prevent flooding and pollution while also making use of the rainwater. 4. Scientists created a system to measure how well different techniques work together. 5. They tested this system on five different designs for a sports center project. Definitions- Low Impact Development (LID): Techniques used to manage stormwater at its source, such as using permeable pavement or bio-retention facilities. - Non-point source pollution: Pollution that comes from many sources, rather than one specific location. - Storm Water Management Model (SWMM): A computer program used to simulate how water moves through urban areas during storms. - Analytical Hierarchy Process (AHP) method: A decision-making tool used to compare and prioritize different options based on multiple criteria.

Sponge City Construction: A Comprehensive Evaluation System for Optimal Selection of Low Impact Development (LID) Techniques

In recent years, Sponge City construction has gained popularity in China as a relatively new approach to urban stormwater management. It involves the use of Low Impact Development (LID) techniques to effectively manage stormwater at the source, thereby reducing urban flooding and non-point source pollution while promoting rainwater resource utilization. Li Qian and colleagues developed a comprehensive evaluation system that uses the Storm Water Management Model (SWMM) and Analytical Hierarchy Process (AHP) method to quantify the benefits of different combinations of LID units.

Background

The concept of sponge city construction is based on the idea that cities should be designed with permeable surfaces such as green roofs, grassed swales, sunken green spaces, permeable pavement, and storage tanks so that water can infiltrate into the ground instead of running off into rivers or sewers. This helps reduce runoff volumes and improve water quality by filtering out pollutants before they enter waterways. Additionally, it reduces flood risk by providing additional storage capacity for excess rainfall during storms.

Study Design

To test their proposed evaluation system for selecting optimal combinations of LID units for sponge city projects, Li Qian et al applied it to analyze five LID design scenarios for a sports center project in Guangxi, China with varying locations and sizes of bio-retention facilities, grassed swales, sunken green spaces, permeable pavement, and storage tanks. The results were then compared using a comprehensive performance index which included requirements for 75% annual total runoff reduction while achieving good operation performance; rainwater utilization; landscape promotion; ecological service functions; etc.

Results & Discussion

The results showed that the green scenario with 34.5% bio-retention facilities and 46.0% sunken green spaces had the best comprehensive performance among all five scenarios in meeting requirements for 75% annual total runoff reduction while achieving good operation performance; rainwater utilization; landscape promotion; ecological service functions; etc., making it an ideal choice for constructing this particular sports center project in Guangxi province. Furthermore, this proposed evaluation system can be used not only for optimal selection but also for performance effect evaluation of LID practices in other sponge city projects across China or even around the world – thus providing valuable insights into how LID techniques can be used effectively in sponge city construction projects to mitigate urban flooding while promoting sustainable water management practices overall.

In conclusion , this study provides important evidence about how effective Sponge City construction can be when combined with appropriate Low Impact Development (LID) techniques – helping us better understand how we can use these strategies together to reduce urban flooding while promoting sustainable water management practices worldwide!