Calculation and Analysis of Effective Utilization Coefficient of Farmland Irrigation Water——Take Pingliang City,Gansu Province as an Example

Absract: This paper takes Pingliang City, Gansu Province as an example. From 28 small and medium-sized irrigation districts, five sample irrigation districts including Jinghe Irrigation District, Jingqing Irrigation District, Shuhe Irrigation District, Shuiluo River Irrigation District and Limingchuan Irrigation District are selected to meet the requirements. The "front-end measurement algorithm" calculates the effective utilization coefficient of farmland irrigation water of various types and sizes of irrigation districts in Pingliang City in 2020.The results are: the effective use coefficient of farmland irrigation water in the first-class medium-sized irrigation area is 0.549 0, the effective use coefficient of farmland irrigation water in the second-class medium-sized irrigation area is 0.552 0, and the effective use coefficient of farmland irrigation water in the small-scale irrigation area is 0.557 0.The effective utilization coefficient of farmland irrigation water in Pingliang in 2020 is 0.552 0. The calculation results have a certain guiding effect on the planning and utilization of water resources in Pingliang City.