For a given channel geometry slope and roughness and a specified value of discharge a unique value of depth occurs in steady uniform flow.
对于给定的河道几何形状、坡度、粗糙度以及规定排水量，均匀稳流中出现唯一深度值。
Most of wter flow in open-channel or in river belongs to steady non-uniform flow. The surface profiles are caused by changes of channel section. It is very important to analyze its computations.
人工渠道中的水流绝大多数是非均匀流，分析计算其水面曲线的变化规律是确定明渠边墙高度及回水淹没范围的重要依据，因此在工程实践中具有十分重要的意义。
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