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阿安引水隧洞是南水北调西线一期的龙头工程,年调水量7亿m~3。引水隧洞设计为无压隧洞,隧洞布置包括有压进水口段、消能段、渐变段、洞身段。隧洞的设计输水流量Q=24．98m~3/s,工作水头5．22～84．22m。采用消力池消除多余能量,消能段与渐变段以缓坡相连,洞身为圆形断面,洞长13．438km,洞径4．68m,设计流量下洞内正常水深3．5m。
A water diversion tunnel is the leading project of the first phase of the South-North Water Diversion West Route with an annual water transfer of 700 million m3. The diversion tunnel is designed as a pressureless tunnel. The tunnel layout includes pressure intake section, energy dissipation section, gradual section and tunnel section. Design of the tunnel water flow Q = 24.98m ~ 3 / s, working head 5.22 ~ 84.22m. The use of stilling pool to eliminate excess energy, energy dissipation section and the gradient section connected with a gentle slope, the hole is a circular section, the hole length 13.438km, hole diameter 4.68m, the design flow under the hole normal water depth 3.5m.