Abstract
With the development of global climate change and urbanization in China, urban waterlogging caused by rainstorm has a serious impact on the safety of people’s life and property and the development of social and economic. Based on the hydraulic model, taking Xining City as an example, a set of multi-layer flood prevention infrastructure construction technology system is proposed, in which the microscale-drainage-system mainly includes the sponge transformation of building blocks, the construction of sponge park; the mesoscale-drainage-system mainly includes the transformation of pipe system for different return periods, the transformation of combined flow and separate flow system; the macroscale-drainage-system mainly includes utility tunnel system, natural and artificial storage facilities. Through quantitative evaluation of rainstorm with 50 year return period, under the construction of microscale-drainage-system and mesoscale-drainage-system with different return period index, the total drainage capacity increased from 1.407 million m3 to 1.573 million m3 and 1.830 million m3. The total accumulated water is 1.073 million m3 and 0.816 million m3 respectively, which are less than 1.173 million m3 of macroscale-drainage-system new storage capacity.
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