catchment management

例句：

1. 1. Thecatchment area is responsible for the waterquality of the river.
   该流域负责河流的水质。
2. 2. The catchment management plan aims toreduce pollution in the region.
   流域管理计划旨在减少该地区的污染。
3. 3. The governmenthas implemented a catchmentmanagement system to improve water quality.
   政府实施了一个流域管理系统以改善水质。