U.S.G.S. 8-digit, Hydrologic Units

8-digit, U.S.G.S. Hydrologic Units. Modified by KY Division of Water and KY Dept. of Fish & Wildlife Resources to meet specific mapping needs in KY. The HUC layer was created by the USGS using ARC/INFO Geographic Information System (GIS) software and attributed to the 11- and 14-digit hydrologic unit code by the NRCS. The basis for selection of 11- and 14-digit hydrologic units is named streams on 1:100,000 scale maps. All named streams on 1:100,000 scale maps had basin boundaries delineated and digitized from 1:24,000 scale maps. Watersheds and contributing areas for watersheds in Kentucky. Water resource planning and water quality management.