Core Insights - The completion of the main structure of the sponge city project in Tongzhou District, Beijing, marks a significant milestone for urban water management and flood prevention efforts [1] - The project includes two flood prevention pump stations and two water storage and purification pools, aimed at addressing extreme rainfall and improving water quality in the North Canal [1] Group 1: Project Overview - The sponge city project consists of the Yudai River Street flood prevention pump stations and water storage purification pools, designed to handle extreme rainfall and prevent waterlogging [1] - The two flood prevention pump stations have capacities of 26 cubic meters per second and 18 cubic meters per second, respectively, to effectively manage water flow during heavy rain [1] - The total storage capacity of the two purification pools is 16,700 cubic meters, significantly reducing the frequency of sewage overflow into the river [1] Group 2: Technology and Innovation - The project utilizes silicon sand honeycomb water storage self-purification technology, integrating functions of pollution interception, peak regulation, water storage, purification, and reuse [1] - The initial rainwater, containing sediment and pollutants, will be treated through a diversion and sedimentation system for direct use in landscape irrigation and water replenishment [1] Group 3: Environmental Impact - The construction employed a "closed construction, intelligent management" model, utilizing a membrane structure to minimize environmental impact [2] - The membrane structure measures 165 meters in length, 80 meters in width, and 37 meters in height, covering an area of 21,000 square meters, effectively reducing dust particles by over 90% and noise by over 70% during construction [2]