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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.
Great Lakes watershed is nearly three times the size of the actual lakes, encompassing more than 767,000. square miles (GLIN, 2009). The St. Lawrence River flows 530 miles from Lake Ontario to the Gulf of St. Lawrence âwith a fall of 245 feetâ (USACE, 2007). According to the U.S. Army Corp of Engineers (USACE) âthe International Section of the river extends for a distance of 115 miles from Lake Ontario to St. Regis, New.