Sponge city+common ditch, the simple and direct way is "elevated underground, rainwater recovery". Case: The sand pit flood storage project in the western suburbs of Beijing is a sample of the construction of sponge city in Beijing. As the largest "water-absorbing sponge" in Beijing, during the flood season of 20 16, the project has flood control capacity and can store about 7 million cubic meters of rainwater, equivalent to 3.5 Kunming lakes. Total area of Tongzhou experimental area 19.36 square kilometers. The construction tasks include 5 1 construction projects in seven categories, including sponge buildings and communities, sponge parks and green spaces, sponge roads and squares, water system improvement and ecological restoration, flood control and drainage, pipe network construction and management platform construction. Low-lying areas use the retention function and buffer zone of organisms themselves to improve the net flow rate of rainwater. Xixian New Area is located at the junction of Xi and Xianyang. In the construction of sponge city, Xixian New Area focuses on the comprehensive utilization of rainwater, making the rainwater "stop, flow first and permeate once", restoring wetland sponge through Fenghe, Weihe and Doumen reservoirs, and constructing river and lake systems; Through Weibei Mausoleum Scenic Area, Ancient Capital Scenic Area of Zhou, Qin and Han Dynasties, and ecological farmland, we can realize ecological sponge conservation and build a green ecological background. The urban sponge construction system is formed by road forest belt, street green space and urban park, and the urban green grid pattern is constructed. Roof greening and comprehensive utilization of water resources by concave green space and permeable bricks are also the focus of sponge city construction. The specific planning direction is: (1) collect and utilize the rainwater in the building community as much as possible; Municipal road green space should strengthen the function of water collection and purification; Using the central rain and flood system and landscape green space to form a storage hub; Landscape green space naturally collects rainwater according to the terrain.

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