What is a Watershed?
From the Pennsylvania Water Atlas “Watershed” is a generic term used to identify an area of land that drains to a particular waterbody. Watersheds can vary in size, from the acreage that drains into a brook to a major river. For purposes of this atlas, watersheds are classified by a nested hierarchy based on landscape scale. A watershed is the land area that drains into a stream or river (or in some cases, two streams) and is the smallest in size in the classification hierarc