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In order to repair the ecological environment of Sanya City, serve the construction of a sponge city in the location, and increase the core competitiveness of tourist cities, this paper, based on the compilation of the special plan for Sanya’s sponge city, uses the target decomposition three-level method to conduct target zoning research on the annual runoff total control rate. It analyzes the values and restrictions of the target decomposition of the sponge city construction area and zoning. The results show that, influenced by natural geographical and climatic conditions and urban construction, the annual runoff total control rate of construction in Sanya sponge city is 60%, and the corresponding design rainfall is 25.30mm. Decomposing the current situation and planning of construction land in the block, it can be concluded that the annual runoff control rate in Yuechuan area is 87%, which exceeds the total runoff control target set in the Guidelines. The runoff control rate in the Donghe area is 46.61% to 80%, and the runoff control rate in the Xihe area is the lowest at 46.78% to 56.86%. The research results are expected to provide the scientific basis for the construction of Sanya sponge city.

Study on target zoning and value of annual runoff total control in Sanya sponge city