hydraulic grade line meaning in English

测压管水头线
铃压缩率线
流水压力线
水力坡度线
水力坡降线
水面线

Various computational examples are presented in the paper for different cases , such as simultaneous routing of main and branch streams , routing of dam - break flood , computation of simultaneous outflow from dam , flood calculation in watercourse with multiple branch steams , and computation of the hydraulic grade line in the reservoir
论文针对不同条件分析了干支流同时演进计算、溃坝洪水计算、干支流大坝泄洪对下游的影响、多支流河道演算和库区水面线的计算。