Research and Applications of the Urban Rainwater Resource Utilization in the Pearl River Basin

As an important economic zone in southern China, the Pearl River Basin is faced with the challenges of uneven distribution of water resources in time and space, the contradiction between supply and demand exacerbated by urbanization, and water pollution. Taking Shenzhen City as a typical case, this paper focuses on urban rainwater resource utilization in the Pearl River Basin, and through the analysis of roof and ground rainwater collection technology, purification treatment process and diversified utilization ways, the rainwater resource technology system adapted to the monsoon climate characteristics of the Pearl River Basin is constructed, emphasizing the anti-typhoon, heavy rainfall treatment and the integrated design of "seepage, stagnation, storage, net, use and drainage". Shenzhen's experience shows that policy support, technological innovation and public participation are key to the success of rainwater recycling. The utilization of rainwater resources in the Pearl River Basin should be combined with local climate, economic and geographical conditions, and intelligent monitoring, low-cost purification technology and innovative financing models should be developed in the future. Although the technology system has achieved remarkable results in highly urbanized areas, its popularization in low-urbanized areas still needs further research. This study provides a sustainable water resource management plan for the Pearl River Basin and similar climate zones, which has both economic and ecological value, and provides a technical reference for coping with extreme rainfall under climate change.