Drogue Testing:

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Drogue Testing

• A drogue is a simple device used to measure the
  current in a bay or a stream .. or in a
  clarifier.

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The operator prepares the drogue for a test
run..
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The drogue will move with the current ..
regardless of the direction of the flights or the
skimmer.
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For this test _at_ LA, we did drogue measurements at
two locations along the access bridge.