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在重力流制排水管网中,由于污物的沉积,会引起输水能力的减少。在直径小于1500毫米的排水管道上,均设置了防淤的清洗口。直径大于1500毫米的矩形或圆形排水管道,由于缺乏适宜的清洗方法和疏通工具,没有设置防淤清洗口。为了更精确地评定重力流排水管的输水能力,必须弄清管中污物淤积情况和淤积高度。
In a gravity-flow drainage network, due to the deposition of dirt, the ability to transport water can be reduced. In the drainage pipes with a diameter of less than 1500 mm, a silt-proof cleaning port is provided. Rectangular or circular drainage pipes with a diameter of more than 1500 mm do not have anti-sludge cleaning ports due to the lack of suitable cleaning methods and dredge tools. In order to more accurately assess the capacity of the gravity flow drainage pipe, it is necessary to clarify the condition of the sewage sludge and the deposition height.