采用牛顿迭代法来求解各未知节点的经济水压，进而得出各管段的经济水头损失、经济管径和水源二级泵站的经济扬程。
The Newton iteration method is used to solve the economic pressure on the unknown node, so as to calculate the economic head loss and economic pipe diameter of each section,.
通过水力学分析建立数学模型，求解最经济的管径参数。
Mathematical model is constructed by hydraulic analysis to evaluate the most economic pipeline diameter parameter.
作者结合工程实例，认为应修正设计秒流量计算公式，从而准确确定管径，做到技术先进、经济合理。
The author of this paper proposed a modified formula for flowrate per second calculation to precisely determine the size of pipeline and to make the design advanced in technology and reasonable cost.
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