我省五十年代发展的机电提灌,一般扬程低、灌面小,管道设计采用经济流速,选用成品管道已能满足工程需要;六十年代以后,随着高扬程大面积提水灌区的发展,成品管道已满足不了需要,各地根据条件分别自行设计水管,设计时多采用国内、外经验公式来计算经济管径。本文提出一个计算经济管径的意见,供参考。 In the 1950s, electromechanical irrigation was developed in our province. Generally, the head lift was low, the filling surface was small, the economic flow rate was used in the pipeline design, and the finished pipe was selected to meet the engineering needs. After the 1960s, with the development of large- Finished pipe has been unable to meet the needs of all local conditions under their own design of water pipes, design time to use more domestic and foreign experience formula to calculate the economic caliber. This paper presents a calculation of economic caliber advice for reference.