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: As part of the Turbine Survival Program implemented by U.S. Army Corpsof Engineers, Portland and Walla Walla Districts in the NorthwesternDivision, this study investigates all potential fish passage routes throughthe Bonneville First Powerhouse (B1), minimum gap runner (MGR), anddraft tube using a 1:25 physical turbine model. Fish passage at on-camturbine operations is investigated throughout the complete operatingrange of the B1 MGR to help determine the target operating range forminimizing turbine effects on fish passing through the B1 powerhouse.Relative effects of blade contact, shear, stay vane and wicket passage, drafttube conditions, and effects on egress were determined across the entireturbine operational range at 55 ft head. This includes operation within andbeyond the current 1 operating zone. Results from these modelinvestigations indicate that that steeper blade angles (BAs) (if operated atpeak efficiency for that subject blade angle) provide for better passageconditions for fish. Fewer severe contacts with the turbine runner and lesssevere change in direction occur at steeper BAs. The draft tube elbowperforms better at steeper BAs, and the quality of flow exiting the drafttube is better at steeper BAs. In addition, there are indications that egressconditions may be better at steeper BAs.

Bonneville First Powerhouse ERDC turbine operating range investigation