Understand your watershed through data & maps
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Understand your watershed through data & maps
Carmen Masó & Lucy Stanfield
U.S. Environmental Protection Agency
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Tools
• EPA’s My Environment
• Enviromapper for Water
• Google Earth
• Illinois Resource Management Mapping Service
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Name Level Digit Number of HUCs
Region 1 2 22
Subregion 2 4 222
Basin 3 6 352
Subbasin 4 8 2,149
Watershed 5 10 22,000
Subwatershed 6 12 160,000
What is a Watershed Boundary?A base layer of drainage boundaries and watershed information used in a wide variety of applications by those involved in water-resources management
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Hydrologic Unit Codes
Example: 071200040404 (12-digit HUC) for Salt Fork Watershed
05 12 01 09 06 05Region
Basin
Sub-basin
SubregionWatershed
Sub-watershed
Boundaries are delineated from 1:24,000 scale USGS topographic maps, digital elevation models, and digital raster graphic files.
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Sample quick presentation
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Watershed overview: Salt Fork, Illinois
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Land Cover - 2001
Population Density - 2000
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Materials for today’s workshop
• Training Manual– Overview of Watershed– Mapping tools with step-by-step instructions– Watershed Worksheet to fill out– Website links– Google Earth tips
• On your desktop– Folder named Watershed Training