The calculated flow of any pipe section actually includes the flow along both sides of the pipe section and the transfer flow to the later pipe section through the pipe section. In order to initially determine the calculated flow of the pipe section, the flow distribution must be based on the maximum hourly water consumption. Only after the flow of each pipe section is obtained, can the pipe diameter be determined and the hydraulic calculation be carried out based on the flow. Therefore, the flow distribution is an important link in the calculation of the pipe network.<br>After calculating the node flow, the flow distribution of the pipe network can be carried out. The flow distributed to each pipe section already includes the flow along the line and the transfer flow [7].<br>The traffic distribution of ring network is complex. Because the flow of each pipe segment is not directly related to the flow of each node in the future, and several pipe segments are connected on one node, the flow of any node includes the flow and flow direction of the node and the flow of several pipe segments flowing away from the node. In the process of flow distribution, the flow continuity of each node must be maintained, that is to say, the flow to any node must be equal to the flow away from the node, so as to meet the conditions of flow balance,<br>
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