Red Rock Hydroelectric - Slurry Wall Pella, Iowa The Red Rock Hydroelectric Project, located at the existing Red Rock Dam near Pella, Iowa, will divert water from the existing sluice and spillway outlets of the dam to a new powerhouse that will house two identical owner-furnished vertical Kaplan turbines-generator units. During construction, Case installed a reinforced concrete diaphragm wall along the approach channel, intake structu

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