求翻译：作为一个城市重要的基础设施，排水系统在长期的运行过程中起到重要作用，但排水管道内沉积物的不断淤积会减少水力断面面积，增加过流阻力，从而大大降低管道过过流能力。当沉积物淤积到一定程度会时排水管道的堵塞，影响城市排水管道系统整体的运行和调控。是什么意思？

As a city critical infrastructure , drainage systems play an important role in the long run the process, but the sewer, sediment deposition will continue to reduce the cross-sectional area of ​​the water , increasing the flow resistance, thereby greatly reducing the flow capacity over the pipeline .

As a city of important infrastructure, drainage system in the long run, have an important role, but the sewer sediments in the continuous sedimentation will reduce hydraulic cross-section area, and increase the flow resistance, which can significantly reduce the pipe the flow capacity. When sediment

As a city important infrastructure, the drainage system plays the vital role in the long-term movement process, but in the drainage channel the deposit unceasing siltation can reduce the water power cross sectional area, the increase overflow resistance, thus reduces the pipeline overflow ability gr

As an important urban infrastructure, drainage systems play an important role in the long running process, but drainage pipes have been continuously deposited sediments will reduce the hydraulic section area, increase flow resistance, leading to significantly reduced pipeline capacity. When sediment

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