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Watershed hydrologic units (HU) are generally subdivided into 5 to 15 units. The average size of an 8-digit sub-basin hydrologic unit is about 450,000 acres. The typical 10-digit watershed size is 40,000 to 250,000 acres, while the typical 12-digit subwatershed is 10,000 to 40,000 acres. 8- and 10-digit watersheds can be derived from 12-digit watershed shapefiles.
They are also known as drainage divides because they divide the river system or river basins from other river systems. A watershed is also a term that is being used in the North American region to refer to a water basin which is smaller in size and flows into a smaller outlet such as a stream or wetland.atersheds are considered part of a water basin. In other regions of the world, watersheds are the drainage divides that cut through a river system. While both a river basin and a watershed are land forms, they have different functions in our ecology.