1. 流域面积：世界第四长河,也是北美洲流程最常,流域面积(drainage area)最广,水量最大的河流. 位于北美洲中南部,干流发源于世界上面积最大的淡水湖之一的苏比利尓湖(Lake Superior)的西侧,南北纵贯美国,是美国最长最重要的河流,

2. 排水面积：drainage adit 排水平峒 | drainage area 排水面积 | drainage channel 排水沟

3. 流域：prairies 大草原 | drainage area 流域 | rainfall 雨量

4. 汇水面积：Brain drain 人才流失 | Drainage area 汇水面积 | Traffic flow 交通量

noun

1. the entire geographical area drained by a river and its tributaries
an area characterized by all runoff being conveyed to the same outlet

e.g. flood control in the Missouri basin

Synonym: river basinbasinwatersheddrainage basincatchment areacatchment basin