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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.
A river's adjustment to watershed perturbations may take thousands of years, as is the case throughout much of United States as the result of deglaciation. In other instances, channel modifications may occur in less than a decade, as is frequently the case with direct human activity in a stream channel.