TEMPORARY CELLULAR COFFERDAM DESIGN, …

TEMPORARY CELLULAR COFFERDAM DESIGN, INSTALLATION & REMOVAL AT WILLOW ISLAND HYDROELECTRIC PROJECTA technical paper presented by:The Ruhlin Company &Mueser Rutledge Consulting EngineersFirst presented at HydroVision 2014 TEMPORARY CELLULAR COFFERDAM DESIGN, INSTALLATION, AND REMOVAL AT WILLOW ISLAND HYDROELECTRIC PROJECT Page 1 of 43 Michael Ciammaichella, PE James Tantalla, PhD, PE Vice President, Civil Division Manager Associate The Ruhlin Company Mueser Rutledge Consulting Engineers Sharon Center, OH New York, NY USA USA Abstract For a hydroelectric powerhouse to be constructed along the Ohio River at Willow Island, a CELLULAR COFFERDAM was necessary to control ground and surface waters from entering the required 110-foot deep excavation. The Ruhlin Company was contracted to manage the design and construction of the COFFERDAM .

Page 4 of 43 Figure 1.2 - Site Plan and Cofferdam Components 1.2. General Site Geology The overburden at the site consists of alluvial sands and gravels overlain by finer

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