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

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

Dredging of Charles Mill Lake

How It Works

Dredging of Charles Mill Lake

Dredging Outlet

Screen for Wetland Formation

Wetland Formation

Wetland View 1 As a Wetland!

Wetland View 2

Bed Elevation: 1934

Bed Elevation: 1988

Sediment Depth:

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

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

Images of Deposits

D90 Image

D10 Image

Uniformity Image n Gravelly if Cu>4

Gradation Image