The flows in horizontal drainage pipes from 9L,12L flush tanks of sit toilets are measured and compared with the flows calculated from two formulas of pipe designing in drainage system.

• 测定了9L和12L水箱的坐式大便器出水时排水横管中的流量,并将之与设计中使用的两个流量计算公式相比较,指出两个流量计算公式的不足。