1. Investigate Reservoir Sediment and Watershed Erosion Using GIS Tiao J. Chang and Travis D. Bayes Department of Civil Engineering Ohio University, Athens, Ohio, USA Scott McKeever Muskingum Watershed Conservancy District New Philadelphia, Ohio, USA Prepared for the Sixth Scientific Assembly International Association of Hydrological Sciences Maastricht, The Netherlands July 18-27, 2001

3. Charles Mill Lake n Original Volume* = 11,369 acre-ft n Current Volume* = 8,129 acre-ft n Sediment Volume* = 3,139 acre-ft n 28% Loss of Volume n Used by MWCD for Public Recreation n Need for Dredging Charles Mill Lake U.S. 30 Rt 603 Black Fork of the Mohican River *Note: Data is as of 1993 Rt 430

4. Dredging of Charles Mill Lake

5. How It Works

6. Dredging of Charles Mill Lake

7. Dredging Outlet

8. Screen for Wetland Formation

9. Wetland Formation

10. Wetland View 1 As a Wetland!

11. Wetland View 2

12. Bed Elevation: 1934

13. Bed Elevation: 1988

14. Sediment Depth: 1934-1998

15. Collecting Samples n Used GPS and USGS Maps for back-up n 60 sediment sample sites were selected 1. Retrieving the Samples (4 days) 2. Bagging the Samples for Transport

16. Recording Attributes - Recorded UTM coordinates, sample #, general grain size and color with Munsell Chart - Ground sediment and sieve analysis (8 weeks)

17. Images of Deposits

18. D90 Image

19. D10 Image

20. Uniformity Image n Gravelly if Cu>4

21. Gradation Image