Investigate Reservoir SedimentInvestigate Reservoir Sedimentand Watershed Erosion Using GISand Watershed Erosion Using GIS

Tiao J. ChangTiao J. Chang and Travis D. Bayes and Travis D. Bayes

Department of Civil EngineeringDepartment of Civil EngineeringOhio University, Athens, Ohio, USAOhio University, Athens, Ohio, USA

Scott McKeeverScott McKeeverMuskingum Watershed Conservancy DistrictMuskingum Watershed Conservancy District

New Philadelphia, Ohio, USANew Philadelphia, Ohio, USA

Prepared for the Sixth Scientific AssemblyPrepared for the Sixth Scientific AssemblyInternational Association of Hydrological SciencesInternational Association of Hydrological Sciences

Maastricht, The NetherlandsMaastricht, The NetherlandsJuly 18-27, 2001July 18-27, 2001

Charles Mill LakeCharles Mill Lake

Original Volume* = Original Volume* = 11,369 acre-ft11,369 acre-ft

Current Volume* = Current Volume* = 8,129 acre-ft8,129 acre-ft

Sediment Volume* = Sediment Volume* = 3,139 acre-ft3,139 acre-ft

28% Loss of Volume28% Loss of Volume Used by MWCD for Used by MWCD for

Public RecreationPublic Recreation Need for DredgingNeed for Dredging

Charles Mill LakeCharles Mill Lake

U.S. 30U.S. 30

Rt 603Rt 603

Black Fork of theBlack Fork of theMohican RiverMohican River

*Note: Data is as of 1993*Note: Data is as of 1993

Rt 430Rt 430

Dredging of Charles Mill LakeDredging of Charles Mill Lake

How It WorksHow It Works

Dredging of Charles Mill Lake Dredging of Charles Mill Lake

Dredging Outlet Dredging Outlet

Screen for Wetland FormationScreen for Wetland Formation

Wetland FormationWetland Formation

Wetland View 1Wetland View 1

As a Wetland!As a Wetland!

Wetland View 2Wetland View 2

Bed Elevation: 1934 Bed Elevation: 1934

Bed Elevation: 1988 Bed Elevation: 1988

Sediment Depth: 1934-1998Sediment Depth: 1934-1998

Collecting SamplesCollecting Samples

Used GPS and USGS Maps for back-upUsed GPS and USGS Maps for back-up 60 sediment sample sites were selected60 sediment sample sites were selected

1. Retrieving the Samples (4 days)1. Retrieving the Samples (4 days)

2. Bagging the Samples for Transport2. Bagging the Samples for Transport

Recording AttributesRecording Attributes

- Recorded UTM coordinates, sample #, general - Recorded UTM coordinates, sample #, general grain size and color with Munsell Chartgrain size and color with Munsell Chart

- Ground sediment and sieve analysis- Ground sediment and sieve analysis(8 weeks)(8 weeks)

Images of DepositsImages of Deposits

D90 ImageD90 Image

D10 ImageD10 Image

Uniformity ImageUniformity Image Gravelly if Cu>4Gravelly if Cu>4

Gradation Image Gradation Image