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我省万亩以上灌区160多处,干、支渠道总长8300多公里,截至1977年底,已衬砌约3000公里,其中大部分系用混凝土衬砌,起到了减少渗漏,节约水量,提高渠系水利用系数,增加灌溉亩次或扩大灌溉面积;降低地下水位;提高输水挟沙能力;保证输水安全的作用。但由于衬砌渠道多是黄土地基,气候寒冷(如关中地区,最低气温-17～-21℃,最
There are more than 160 irrigated areas of more than 10,000 mu in our province. The total length of dry and branch channels is over 8,300 km. As of the end of 1977, about 3,000 km of lining has been lined up, most of which are made of concrete linings, which have reduced leakage, saved water and increased canal water Utilize the coefficient, increase the acreage of irrigation or expand the area of irrigation; Reduce the groundwater level; Improve the sediment carrying capacity of water conveyance; Ensure the safety of water conveyance. However, because the lining of the channel is mostly loess foundation, the climate is cold (such as Guanzhong area, the lowest temperature of -17 ~ -21 ℃, the most