Clarity focus of Tahoe Summit

August 16, 2007

UC Davis researcher Brant Allen collects samples zooplankton, which can affect Lake Tahoe's clarity. Photo by Bonnie Jo MountSome critics argue it’s too simple - crude even - but experts say that’s the advantage of the white disk, called the Secchi dish, lowered into the lake to determine clarity.”When people ask, what is clarity, what they’re really asking is how far down can I see to the bottom of the lake,” said UC Davis researcher Brant Allen, who conducted the test Wednesday. “For translating scientific clarity to the public, you can’t beat the Secchi dish.”Allen watched as the Frisbee-sized dish sank deeper and deeper into Tahoe’s famously blue water. Once it disappeared from sight, the depth of clarity for that day was determined - about 67.3 feet.==Start Related Links|Annual clarity measurements==

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