In 1993, Chelan P.U.D. Washington, U.S.A needed for flow data for the design of fish diversion screens. Data collection was complicated by magnetic disturbance caused by the proximity to the dam. Magnetic compasses used on most current-meter beams are unreliable when measurements are made close to dam walls and the associated power-generating infrastructure.
In 1996, Cominco Ltd., B.C., Canada needed to expand power generation capability at one of their plants. They needed to know whether this expansion would result in detrimental effects on the downstream habitat of sturgeon fish population levels.