Tainan City, Yongkang District, Xiwanli Detention Pond Project

Awards : 
    Won the "2020 National Construction Excellence Award" of the Real Estate Association of the Republic of China, and won the Best Environmental and Cultural Category, Public Works and Urban Space  Quality Award
Client : Tainan Water Conservancy Bureau
Location : Yongkang District, Tainan City
Plan period : 107/01~108/12 of the Republic of China
Program Overview : 
    The project is located on the east side of the Yongkang Dawan self-run municipal land rezoning area of the 116th phase of Yongkang District, because the original rainwater sewer drainage zoning was changed after the rezoning was completed, which exceeded the drainage capacity of the original planned sewer, so the existing detention pond was used for expansion to achieve the effect of flood detention and disaster reduction.
    The section of the detention pond considers the underwater and geology, the lower layer adopts a rigid low-water revetment to ensure the stability of the pool, and the upper waterfront space adopts anti-erosion plant slope protection, which can often be used for the public to walk, exercise, rest and be hydrophilic; In addition, in order to reduce the loss of groundwater at the bottom of the pond and avoid the influence of buoyancy, the soil at the bottom of the pond is solidified with pressure relief holes; In addition, a retaining weir is set up in the box culvert discharged into the existing detention pond, and the constant flow of water is intercepted and discharged to the existing rainwater sewer with a pipe culvert, so as to avoid the influence of domestic sewage on the water quality of the pool, and the water level of the water will be higher than the retaining weir when the flood is flooded. In order to avoid the overflow of runoff at the bottom of the pond, a low water flow path is set up and aquatic plants are planted with holes, which can purify the water quality in addition to the centralized flow path.
    In order to maintain the function of the park and green space, create a space configuration for interaction between people and the environment, such as entrance squares, trails around the lake, exhibition and performance spaces, etc., to provide people with recreation, and create a friendly water environment space that is friendly to water and green; Multi-layer planting is planted around the detention pond to increase ecological diversity, and native trees from Taiwan are mainly planted along the upper lake trail, and water-resistant trees and shrubs are mainly planted in the lower layer, and new grass blankets are set up to absorb carbon dioxide, release oxygen, form urban lungs, improve air quality, and create a breathing green sponge city.
    The overall benefits are to protect the area around Xiwanli in Yongkang District and the 116th Yongkang Dawan self-run municipal land rezoning area (with an area of about 20 hectares and a population of more than 10,000 people), reduce the burden of the downstream Kunshan Pumping Station and Dawan Pumping Station, improve flood prevention capacity and reduce the threat of flooding in flood-prone areas, protect the life safety of the people in the urban planning area, and provide citizens with leisure, recreation and green space, improve the quality of life of the surrounding environment, and recreate a livable residential environment.