Make your own Secchi-disk

You can make a Secchi-disk easily by yourself. This is what you need:

• About 10 meters of rope or cord
• A 1-2- kg's plummet (e.g. a stone)
  
• A round, white, waterproof disk of 30 cm's diameter (e.g. a bucket lid)

This is how you make a Secchi-disk:

• Drill a hole to your disk.
• Thread your rope or cord through the hole.
• Attach your plummet on the other side of the disk and the rope or thread on the other.
• Make a measuring scale by tying knots to your rope every 50 cm’s.
• Start making visibility depth measurements.
  

To find out how to use your Secchi-disk, click here or read the SECCHI-leaflet.pdf [pdf, 1 MB] . In case you don't want to build your own disk, you can order one from here . Free of charge,

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