watershed 和river basins区别

查了一下韦氏字典
watershed多指划分的支流（divide）或者特定的支流或河流的某一段，例如turning point；
river basin的范围比较广，可以泛指所有的河流水体，尤其是大的江河的整个水系。

个人理解：watershed management针对某个城市或行政区域中河流流域的管理控制；river basin management针对整个河流的控制，包括从源头到入海口。

下面给你watershed和basin两个词在韦氏的原版解释：
watershed：
1 a : DIVIDE 2a b : a region or area bounded peripherally by a divide and draining ultimately to a particular watercourse or body of water
2 : a crucial dividing point, line, or factor : TURNING POINT

basin：
1 a : an open usually circular vessel with sloping or curving sides used typically for holding water for washing b chiefly British : a bowl used especially in cooking c : the quantity contained in a basin
2 a : a dock built in a tidal river or harbor b : an enclosed or partly enclosed water area
3 a : a large or small depression in the surface of the land or in the ocean floor b : the entire tract of country drained by a river and its tributaries c : a great de