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在考虑了二级泵站分级供水的基础上，把整个管网系统作为一个整体，根据水塔在管网中的位置，分别建立了两类网中水塔树状给水管网优化设计的数学模型。应用所提出的优化模型，在保证管网各节点流量压力条件下，可确定管段尺寸，水塔高度及泵站扬程最优值，使管网系统年费用最低。由于优化模型为线性规划模型，便于计算机求解。这一方法也可推广应用到网前和对置水塔树状给水管网系统的优化设计中去
After considering the graded water supply of the secondary pumping station, the entire pipe network system is taken as a whole. According to the position of the water tower in the pipe network, the mathematical models for optimal design of the tree-shaped water supply pipe network of the water towers in the two types of networks are established. Applying the proposed optimization model, under the condition of guaranteeing the flow pressure of each node of the pipeline network, the pipe segment size, water tower height and the pump station lift optimal value can be determined, so that the annual cost of the pipe network system is the lowest. Because the optimization model is a linear programming model, it is easy to solve by computer. This method can also be applied to optimize the design of tree-shaped water distribution network systems for front and opposing water towers.