1. U.S. Department of the Interior U.S. Geological Survey Jim Nicholas, Center Director USGS Michigan Water Science Center U.S. Department of the Interior U.S. Geological Survey Great Lakes Basin Pilot National Assessment of Water Availability and Use

2. National Emphasis—Regional Focus Develop methods applicable to national program Respond to Great Lakes issues—Compact

3. Water Availability ____________ Water Quality Limitations Ecosystem Requirements Storage Flows Use

4. Regional Recharge

5. Groundwater Divides Watershed divide Groundwater divide

6. Water Use Trends Water Use Population Data not available by Watershed

7. Monthly variability in Ohio water use

8. Groundwater equals another Great Lake: 14,000 billion cubic feet Annual flow out of GL is 1 percent of water in storage Water use is 65,000 cfs Consumptive use is 3000 cfs

9. Availability includes Ecosystem Needs

10. http://water.usgs.gov/wateravailability/greatlakes