Flood Control Effects

• As more concrete embankments within the basin are replaced by ecological embankments, the flood process line becomes more gentle. When only the river channel cover parameter C (vegetation coverage rate) is changed, with A taking the maximum value, the Manning's coefficient of the main river channel increases from 0.050 to 0.100, and the increase in flow during the recession process rises from 67.96 m³/s to 83.70 m³/s.
• The ecological embankment model of Yanweizhou Park has a significant effect on flood peak reduction. When all concrete embankments within the basin are replaced with ecological embankments, the reduction rate of the annual maximum one-day flood peak can reach up to 63%. Among this, the contribution rate of the river channel cover parameter to the reduction rate of the annual maximum one-day flood peak is over 84%, and it decreases with the increase of vegetation coverage and the reduction of slope gradient.
• The ecological embankment of Yanweizhou Park can successfully withstand all flood events within the simulated years. Under the initial scenario, the maximum flood peak water level at the basin outlet section is 37.52 m, which is greater than the critical water level of 37.00 m at Jinhua Station; when ecological embankments gradually replace concrete embankments, the maximum flood peak water level at the basin outlet can be reduced to 36.42 m, which is less than the critical water level, and has strong value for promotion and application.
• The inundation areas within Yanweizhou Park can be divided into three categories. The first-level inundation area will be flooded by the maximum flood in all scenarios within the study period, with only the head of the islet wetland being submerged; the second-level inundation area will be flooded by the maximum flood in 108 scenarios within the study period, with only the fourth terrace and the head of the islet being submerged; the third-level inundation area will not be flooded in all scenarios

Data Source:

Li Y, Wang C. Study on Flood Control Effects of the Jinhua River Basin Based on the Yanweizhou Ecological Embankment Model[J]. Acta Ecologica Sinica. 2019, 39(16): 5955-5966.

Social benefits

• The park provides diverse activity spaces, with high visitor satisfaction in stress relief, increased physical activity, and improved quality of life. Facility ratings reached 4.50, and lighting safety scored 4.40, significantly outperforming traditional parks. Its ecological design not only meets residents' recreational needs but also enhances community cohesion.
• In terms of economic and cultural impact, the park's iconic features, such as the Rainbow Bridge and Wu Opera Theater, have made it a cultural landmark in Jinhua, attracting both local and non-local tourists. Visitors from other provinces account for 8.92%, showcasing the park's role in regional cultural dissemination.
• The park integrates ecological and cultural functions, strengthening the city's image and cultural identity through wetland preservation and landscape bridge design, with a city image score of 4.40.
• Challenges faced by the park include insufficient shade, high summer temperatures, and visitor management issues, which urgently require additional trees, cooling facilities, and improved navigation systems.

Data Source:

Su Y, Shu L. Evaluation of the Social Performance of Urban Stormwater Parks: A Case Study in Jinhua, Zhejiang[J]. Sustainability, 2025, 17, 259. https://doi.org/10.3390/su17010259