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Biologists from the Kansas Biological Survey prepare to lower the pipe that will take a core sample. The motor atop the pipe vibrates the tube to help it penetrate silt.
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Michael Pearce / The Wichita Eagle
A siltation core sample. Some lakes are almost half-filled with silt.
John Redmond Reservoir.
After pushing a siltation core from a tube biologists prepare to take samples.
Members of the Kansas Biological Survey lower a tube to take a core sample at Kanopolis Lake.
Mark Jakubauskas adds a sedimentation sample to a bag held by Adam Blackwood.
The smooth portion of the core sample on the left is the original soil. The rest is siltation.
Sedimentation at Perry Reservoir has built up to a sizable island. The Kansas Biological Survey estimates there are 100 million cubic yards of sediment at the reservoir.
Siltation at the bottom of Kansas lakes tell a story of siltation rates and more.
Mark JJakubauskas with a siltation sample.
Scores of silt samples are taken from lakes being tested for siltation rates and pollution.
All tools and equipment are cleaned between taking samples to prevent contamination.
This once-popular boat ramp at the Paradise Point of Perry Reservoir now leads to 30-foot trees that grow on siltation.
Mark Jakubauskas with a siltation sample.
Biologist Mark Jakubauskas grimaces as he struggles to put a cap on the end of a core sample before it's pulled above water.
Biologists spread an eight-foot long core sample of siltation to take samples for testing.
A section of core sample of siltation at Kanopolis Lake.
Biologist Mark Jakubauskas checks a small portion of a core sample.
Mark Jakubauskas and Adam Blackwood check the mud at the base of a core sample for debris present when the lake was filled.
The Kansas Biological Survey's core-drilling pontoon boat is being used at most Kansas reservoirs and lakes.
Related story: Sediment's a growing problem in Kansas lake and reservoirs