“Watershed”一词,对许多人来说是个新的术语.由于流域保护和防洪而广泛地采取了水土保持措施,于是流域这个术语更加普遍地被应用起来.几乎象单句一样,如众所周知的格言“水向低处流”,流域可比喻为从水槽排放漂洗水进入你的厨房污水井一样.在陆地上,假如水不蒸发也不渗透到土壤里去,通常都是排入沟渠、河川、沼泽或湖泊,这样来自地表的水按一定的方向排泄就构成了流域.在童年时代,你或许有一种嗜好,喜欢在泥水里玩耍,水由院落排入大坑里这也属于流域性质. The term “Watershed” is a new term for many people and because of the extensive use of soil and water conservation measures for watershed protection and flood control, the term watershed is more commonly used, almost as a single sentence, as the well-known aphorism “The water flows downwards,” and the catchment is analogous to draining rinse water from a sink into your kitchen sewer, and on land, if it does not evaporate and penetrate into the soil, it is usually drained into ditches, rivers, Swamps or lakes, so that water from the surface drains in a certain direction to form a drainage basin. In your childhood, you may have a hobby, like to play in the muddy water, water discharged from the courtyard into the pit which is also a watershed nature.