西线南水北调规划研究了以自流为主的长隧洞方案。隧洞长130～150km,其长度和规模都为世界之最。因此,长隧洞的论证,是西线调水规划研究的关键。世界上长50km 的欧洲隧道(又称英法海峡隧道)的贯通,使隧道的设计和施工得到长足发展。以黄委设计院院长陈效国为团长的欧洲隧道考察团 The West Route South-North Water Diversion Project has studied a long tunnel with gravity flow. The tunnel is 130-150 km long, its length and scale are the highest in the world. Therefore, the argumentation of long tunnels is the key to the west water transfer planning research. Throughout the 50km-long European tunnel in the world (also known as the “Channel Tunnel”), the design and construction of tunnels have been greatly developed. The Yellow River Institute of Design Chen Xiaoguo, head of the European tunnel delegation