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圆形断面是无压隧洞常用断面形式之一。当引水流量Ｑ，衬砌糙率ｎ及底坡ｉ确定后，在满足一定净空面积及净空高度的条件下，所面尺寸按明渠均匀流公式计算确定，计算过程繁复，结果也往往偏大。本文从水力计算的角度导出了按一定面积比及余幅确定断在尺寸的方法
Circular section is one of the common cross-section forms of pressureless tunnel. When the water diversion flow rate Q, the lining roughness n and the slope i are determined, the surface size is calculated and determined according to the uniform flow formula of the open channel under certain clearance and clearance height. The calculation process is complicated and the results tend to be large. This article from the hydraulic calculation point of view derived according to a certain area ratio and margin to determine the size of the method