Total Dissolved Gas Survival Study

Our Role

Four Peaks provided technical support for a public utility client. We evaluated the effect of total dissolved gas (TDG) fish survival on juvenile salmonids transported in barges downstream on the Columbia and Snake rivers. Water pumped from hydroelectric projects served as the source water to imprint juveniles. The juveniles were held in raceways adjacent to the tailrace and transported downstream in the barges. Four Peaks evaluated the accuracy of the current TDG data collection methods and possible monitoring alternatives. Our goal was to provide a statistically rigorous assessment of the effects of TDG control measures and the barge holding environment for juvenile fish survival.