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陇县段家峡水库南干渠扩灌工程是段家峡水库灌区的挖潜续建工程。1987年9月动工,于1989年12月全部完成,经过两年多的奋斗,延长干渠1.6公里,新修两条支渠11公里,修建各类建筑物111座,兴修抽水站6座,总装机869瓩,变电设备1210千伏安。工程完成土石方29.6万立方米,其中有长518米、最大压力水头32米的倒虹工程,有长965米隧洞工程和扬程78.5米、装机715瓩抽水站工程。完成总投资279.6万元,使15000亩旱地变水地,同时还增加双灌面积3000亩,
Longxian Duanjiaxia South Canal ditch expansion project is Duanjiaxia irrigation dug up the project. It started in September 1987 and was completed in December 1989. After more than two years of struggle, it has extended 1.6 kilometers of main culverts, newly built 11 kilometers of two branch channels, built 111 buildings of all kinds, built six pumping stations and installed the total installed capacity 869 瓩, substation equipment 1210 KVA. The project has completed 296,000 cubic meters of earth and stone, of which there is an inverted rainbow project of 518 meters in length and 32 meters in maximum pressure head. There is a 965-meter long tunnel project and a head lift of 78.5 meters and a 715-ton pumping station. A total investment of 279.6 million yuan to make 15,000 acres of dry land water, while also increasing the area of double irrigation 3000 acres,