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Slowikowski, J.A.

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The modern-day lower Illinois River flows within a greatly oversized valley formed by an old course of the Mississippi River and glacial outwash events. As a result, the section of the Illinois from its mouth near Grafton to Henry, Illinois is characterized as a low-gradient, aggrading bed stream with large backwater areas. Sedimentation in the river threatens to convert the system from one of river/backwater areas to one of channel/marshes. The sediment budget of Peoria Lake, a major backwater lake along the river, includes input and output through the Illinois River and inputs from several small direct tributaries. Results after two-year monitoring of these small tributaries indicate that they are a significant...
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This report summarizes the results of a two-year study on the determination of the input of sediment to Peoria Lake from its local tributaries. Ten local tributaries were monitored to determine the flow of sediment and water. Long- term average deposition of coarse material at the mouths of these tributaries was estimated as bed load based on the progression of the deltas at the base of the tributaries. Sediment inflow to Peoria Lake from the Illinois River was determined based on the estimated sediment load at the Henry gaging station. Water year 1989 (WY89) was essentially a dry year and WY90 was average. The present analyses have shown that about 1.2 million tons of sediment flowed into Peoria Lake in WY89 and...
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