Watermark Limnological Weighted Secchi Disc

This 20cm diameter secchi disc is made of Sintra PVC.

Features

  • Silk screened with black and white quadrants
  • Stainless steel hardware
  • Built-in 24 oz. zinc sounding weight
Your Price $70.81
Usually ships in 3-5 days
Watermark
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Watermark Limnological Weighted Secchi Disc77912 Limnological weighted secchi disc
$70.81
Usually ships in 3-5 days
Silk screened with black and white quadrants, the WaterMark limnological 20cm diameter weighted secchi disc is made of Sintra PVC.
  • 20 cm diameter secchi disc
  • 24 oz. zinc sounding weight
  • (1) Stainless steel hardware secchi disc
  • (1) Built-in 24 oz. zinc sounding weight
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Long-term Secchi disk records show Lake Tahoe clarity decline has stabilized

Lake Tahoe is one of the clearest lakes in the United States, helped by the relatively small size of its surrounding watershed and the granitic basin it sits in. Around 1968, the first year that its clarity was measured by Secchi disk, Tahoe’s blue waters were even clearer than they are today. Measurements at that time show an average yearly clarity of more than 100 feet. But such clarity was never reported again as its waters began a decline that lasted well into the 1990s. At that point, the decline of average annual clarity measurements leveled out and stabilized, which is better news than it sounds.

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Secchi Dip-in encourages citizen monitoring this summer

A monitoring initiative named for Secchi disks encourages people across the world to test the water nearby from the end of June through mid-July. It’s called the Secchi Dip-in and its organizers want anyone with the means to test their local water to do so and report back.  The database is open to contributions from June 29 through July 21. Volunteers, monitoring groups and professionals alike can contribute data to the Secchi Dip-in database.  Turbidity data is the main information Secchi Dip-in organizers want to see, but they won’t turn down any kind of water quality data people contribute. They encourage interested environmentalists to go out with someone who is experienced in testing for water quality to ensure data is accurate.

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Digital Mayfly Data Logger Sensor Stations Monitoring Watersheds

For most humans, mayflies seem like a nuisance, hovering over the waterways as we try to enjoy them. However, for anyone hoping to monitor the health of watersheds, mayflies are important aquatic species—and now, a digital version of the mayfly is helping some scientists keep an eye on the water. Research scientist Dr. Scott Ensign , who serves as Assistant Director of the Stroud Water Research Center , spoke to EM about how the digital mayfly technology developed. “ Shannon Hicks is the engineer who started developing the Mayfly six or seven years ago,” explains Dr. Ensign.

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