Abstract
Emergency water source plays a vital role of reducing risks of water supply in cities. The Chinese government has paid great attention on reserve and emergency water source. They have made clear the construction time requirements. For cities with single water source, the construction of emergency water source or standby water source should be basically completed by the end of 2020. This paper summarizes the planning content of the emergency water source project in the city, and focuses on the key points of Xiantao emergency water source function positioning. The key points includes water source function identification, economic scale calculation and determine risk duration. In the original plan, the risk duration is fifteen days, the effective storage capacity of the reservoir is proposed to be 3.5 million m3. Through systematic analysis and calculation, the risk duration is ten days, the effective storage capacity of the reservoir is 2.3 million m3. The project plan is optimized and the investment is saved. It is expected to provide a guidance for planning of standby and emergency water supply system in cities.
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