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Water flow - speed measurement

Hi everyone,


I am doing data aquisition on a marine turbine generator and I need to know a few essential things using Labview. I need to know the:

  • hydraulic pressure that it outputs
  • rotational speed that it is spinning with
  • flow speed of the surrounding water. 

I have mostly designed everything for the first 2 pieces but I was wondering if anyone had any suggestions about the type of equipment that I should invest in to find the water's speed. Some info about the water: We're in a dock with a pretty strong current passing by (up to about 5.5 knots). It's a dock near the ocean, so the tides will move in and out and I need to track the data for possibly days at a time. 


Any suggestions would be great! Thanks

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