Tributary Modeling and Coastal Mapping w.r.t. Watershed Planning in the Great Lakes US Army Corps of Engineers Detroit District Great Lakes Hydraulics and Hydrology Office If it flows, we can model it! Dr. Jim Selegean, P.E., U.S. Army Corps of Engineers

Background and Methodology (Authority) Authority is WRDA 1996, Section 516e. Instructs COE to develop Sediment Transport/Delivery models for GL tributaries to Federal Harbors and AOCs. Use models to target areas for preventative or rehabilitative measures to control sediment loadings. Constrains:Must use existing data No contaminant transport Current or completed studies on : Nemadji, Menomonee, Saginaw, Clinton, St. Joseph, Dead, St. Louis, Grand and Sebewaing Rivers US Army Corps of Engineers Detroit District

Meeting Objectives Identify sedimentation problems Identify past sediment studies Identify existing data sets (digital/paper) Identify appropriate modeling tools Identify local users/keepers of the model US Army Corps of Engineers Detroit District

Previous Studies Saginaw River – Ag Watershed Nemadji River – Forested Watershed Clinton River – Urbanizing Watershed US Army Corps of Engineers Detroit District

Saginaw River Phase I - Scoping Phase II - Model Development Phase III – Technology Transfer/User Workshop US Army Corps of Engineers Detroit District

6,000 square mile watershed Mostly agricultural and forested some urban Large fraction of watershed is sand/silt 275,000 cu. yards dredged each year by the Corps at a cost of $1.1M Sediment sources: mostly agricultural runoff 6,000 square mile watershed Mostly agricultural and forested some urban Large fraction of watershed is sand/silt 275,000 cu. yards dredged each year by the Corps at a cost of $1.1M Sediment sources: mostly agricultural runoff Saginaw River US Army Corps of Engineers Detroit District

Summary Deposition of sediment in Federal Channel can be significantly reduced by adopting agricultural BMPs (30-45% reduction in Cass River sediments) Sand deposits in channel while clays and silts deposit elsewhere in Saginaw Bay Results thus far suggest that a sediment trap in the river may be effective at localizing the deposition of sand. Deposition of sediment in Federal Channel can be significantly reduced by adopting agricultural BMPs (30-45% reduction in Cass River sediments) Sand deposits in channel while clays and silts deposit elsewhere in Saginaw Bay Results thus far suggest that a sediment trap in the river may be effective at localizing the deposition of sand. US Army Corps of Engineers Detroit District

Nemadji Technology Transfer Users Manual Workshop to trail local users NRCS/Carleton County currently using model to manage forestry practices within the watershed US Army Corps of Engineers Detroit District

Watersheds Studied Nemadji Forestry Harvest- Complete Saginaw/CassAgricultural- Complete MenomoneeUrbanization- Complete Clinton Urbanization- Modeling St. JosephAgricultural- Modeling Dead Dam Failure- Modeling St. Louis Env. Restoration- Scoping SebewaingAgricultural- Scoping

US Army Corps of Engineers Detroit District USACE And Coastal Mapping

Additional Data Sets in Coastal Database

For further information: US Army Corps of Engineers Detroit District U.S. Army Corps of Engineers Great Lakes Hydraulics and Hydrology Office Dr. James Selegean, P.E. 477 Michigan Ave Detroit, MI (313)