又叫分水岭线，是分水岭的脊线。它是相邻流域的界线，一般为分水岭最高点的连线。地面分水线，是由于地形向两侧倾斜，使降水分别汇集到两条河流中去的脊岭线。地下水也有地下水的分水线，它决定于水文地质条件。上下两线的位置不一定重合。精确地划出流域分水线，可准确测量计算流域面积。
n. watershed
misc. water parting ; divide line
探讨了利用数学高程模型识别流域分水线、确定坡面水流方向以及计算流域参数的方法。
A method of distinguishing watershed borderline, of ascertaining water flow direction on a slope, and of calculating watershed parameters with digital elevation model is introduced and discussed.
这个项目包含两个相互连接的位于斜坡地势上的，并在一个季节性分水线之上的双胞胎住宅。
The project consists of twin houses sited adjacent to each other on a steep slope above a seasonal watershed.
实桥的斜拉索表面形成的水线位置沿索轴向有可能不均一，各部分水线的摆动可能存在位相差。
For real cables in rain-wind weather, it is likely that water rivulet is non-uniform along cable axis and the phase lag between each part of rivulet movement will be incurred.
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