本文提出用一张满流水力计算诺模图和一张辅助图进行排水管道水力计算的新方法。文中还建议采用管道材料粗糙系数n值随污水管道污水充满度而变的水力计算方法。一、基本原理在圆形断面排水管道的水力计算中,雨水及合流管道按满流计算,使用一张满流水力计算诺模图,计算十分简便。而污水管道按非满流计算,目前应用管径为固定值的成套诺模图进行试算,计算十分麻烦。本文根据满流和非满流水力计算公式之间的关系,经 This paper proposes a new method for hydraulic calculation of drainage pipelines using a full-flow hydraulic calculation nomogram and an auxiliary map. It is also proposed to use the hydraulic calculation method that the roughness coefficient n of pipe material varies with the fullness of the wastewater in the sewage pipeline. First, the basic principle In the hydraulic calculation of the circular cross-section drainage pipe, rainwater and confluent pipes calculated by full-flow, using a full-flow hydraulic calculation nomogram, the calculation is very simple. The sewage pipeline is calculated as non-full-flow. At present, trial calculation is performed using a set of nomograms with a fixed diameter, and the calculation is very troublesome. Based on the relationship between full-flow and non-full-flow hydraulic calculation formulas,