在水文计算、水情预报、水文资料整编工作中,必不可少的要延长有关水文断面的水位流量关系曲线。1943年美国供水报告888号曾经提出用2~(1/S)/N=K作为水位流量关系曲线高水延长的工具。这种方法曾编入1954年编印的《水文资料整编方法》一书中。其具体作法是:令流速公式为 In hydrological calculation, hydrological forecasting and hydrological data reorganization, it is essential to prolong the relationship between water level and flow rate of the hydrological section. 1943 US Water Supply Report No.888 once proposed to use 2 ~ (1 / S) / N = K as a tool for high-water extension of the water flow curve. This method has been incorporated into the 1954 edition of “hydrological data reorganization method” in a book. The specific practice is: make the flow rate formula