黄河三圣公灌溉工程北岸总干渠原设计流量第一期(1962年)为437立米/秒.第二期(1967年)565立米/秒,灌溉面积分别为680万亩及922万亩.总干渠工程1958年施工,1961年投入运行,全长180公里,实际引水流量1962年为400立米/秒,1974年为480立米/秒,实灌溉面积已分别达到470万亩及565万亩,并陆续修建四座分水枢纽.施工时由于工期紧迫,设计工程量大,故采用小断面开挖,施工底宽为设计底宽的25～44%,纵坡1/9000～ The first phase (1962) of the Yellow River San Shengu Irrigation Project’s north-west main canal was 437 m / s, the second phase (1967) at 565 m / s with irrigated area of ​​6.8 million mu and 9.22 million mu, respectively The main canal project was constructed in 1958 and put into operation in 1961 with a total length of 180 km. The actual water diversion flux was 400 m / s in 1962, 480 m / s in 1974 and the actual irrigated area reached 4.70 million mu and 5.65 million mu respectively Four water diversion hubs will be constructed in succession. Due to the tight construction period and large engineering design, excavation with small sections is adopted. The bottom width of the construction is 25-44% of the bottom width of the design, and the longitudinal slope is 1/9000 ~