Based on an experiment of head loss for long-throated flume, the flaw of water head loss calculating formula which based on the theory of boundary layer is pointed out.

• 在实验的基础上,指出对用边界层理论计算长喉槽水头损失公式的缺陷,分析了局部水头损失产生的机理,补充了进口侧收缩水头损失的计算,对原公式进行修正提高计量精度