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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.
For example, a 100-year storm of 30-minutes duration in a 1-square-mile (mi 2) basin will have a more significant effect on streamflow than the same storm in a 50-mi 2 basin. Generally, streams with larger drainage areas require storms of longer duration for a significant increase in streamflow to occur.