experiment objective

You can easily make a sechi disk to measure water turbity -- an indication of water quality in terms of its clarity.

You need...
  • a 20cm-diameter, 6mm-thick Plexiglas disk with a hole in the middle (this may be cut from a square sheet of Plexiglas)
  • metal disk with a hole in the middle (to weigh down Secchi disk)
  • an eyebolt with nuts and washers to fit it
  • rope or cord- try to avoid cotton, as it stretches
  • waterproof black and white paint
  • Read more background about this activity in David Schindler's bio...

    activity briefing

     Instructions and materials can be found at the following places:



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