1前言广利灌区位于河南省焦作市西南部,是河南省重点大型灌溉工程之一,设计灌溉面积3．4万hm~2,为焦作市西部地区国民经济的发展发挥了巨大的效益,但由于灌区工程年久失修,加之投入不足,灌区建设和管理也面临一些突出问题:一是渠道衬砌率低,完好率低,造成渠道渗漏严重,渠系水利用系数较低,仅达到0．4左右;二是渠系建筑物配套率和完好率低,致使 1 Introduction Guangli Irrigation District, located in the southwestern part of Jiaozuo City, Henan Province, is one of the key large-scale irrigation projects in Henan Province. The designed irrigated area is 34,000 hm 2, which has played a huge benefit for the development of the national economy in the western part of Jiaozuo City. However, Due to the disrepair of the irrigated area and the insufficient investment, the construction and management of the irrigated area also face some outstanding problems. First, the low lining rate of the canal and the low rate of intactness cause serious channel leakage and low coefficient of water utilization of the canal, reaching only zero. 4 or so; the second is the canal building supporting rate and good rate is low, resulting in