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A combination of available bathymetric-survey information and
bottom-sediment coring was used to investigate sedimentation and
the occurrence of selected nutrients (total nitrogen and total
phosphorus), organic and total carbon, 25 trace elements,
cyanobacterial akinetes, and the radionuclide cesium-137 in the
bottom sediment of Clinton Lake, northeast Kansas. The total
estimated volume and mass of bottom sediment deposited from 1977
through 2009 in the conservation (multi-purpose) pool of the
reservoir was 438 million cubic feet and 18 billion pounds,
respectively. The estimated sediment volume occupied about 8
percent of the conservation-pool, water-storage capacity of the
reservoir. Sedimentation in the conservation pool has occurred
about 70 percent faster than originally projected at the time the
reservoir was completed. Water-storage capacity in the conservation
pool has been lost to sedimentation at a rate of about 0.25 percent
annually. Mean annual net sediment deposition since 1977 in the
conservation pool of the reservoir was estimated to be 563 million
pounds per year. Mean annual net sediment yield from the Clinton
Lake Basin was estimated to be 1.5 million pounds per square mile
per year. Typically, the bottom sediment sampled in Clinton Lake
was at least 99 percent silt and clay.
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