1. (学校的)招生地区;(医院等的)服务地区
    The catchment area of a school, hospital, or other service is the area that it serves.

2. (地理学上河流的)集水区域，汇水面积
    In geography, the catchment area of a river is the area of land from which water flows into the river.

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 basindrainage area