Abstract:In order to reduce the impact of rainwater and sewage mixing on the water environment, a new round of rainwater and sewage mixing reconstruction is completely implemented in the residential areas of all districts in Shanghai. Focusing on the design stage of rainwater and sewage mixing reconstruction, closely combined with the characteristics of rainwater and sewage mixing reconstruction in residential areas, the common technical problems in the reconstruction process are summarized. The focus is on five rainwater and sewage mixing reconstruction cases with each feature to briefly elaborate the current situation and the reconstruction difficulties of each residential area in the rainwater and sewage mixing. Based on the actual situation, more reasonable reconstruction measures are proposed to solve the problem of rainwater and sewage mixing in residential areas and to improve the quality of water environment.