Well, since the "current" in a river varies from fast in the deep part to almost not at all on the very outer edges, where you like to measure? If you can fasten a rope or cable across the river, you could position a small motor and propeller, properly water proofed, so it was mid-stream. The motor would turn, generating a voltage that is proportional to the current velocity.Research anemometers. They measure the velocity of the fluid called air. Same programs can be used to measure river velocity.Paul
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