Author(s): Yanqing Lian; Tawei Soong; Misganaw Demissie; Gary Clark; Robert Dalton
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Abstract: The propagation of flood waves in the Lower Illinois River from Peoria to Grafton has been studied with the 1-D unsteady flow model, UNET. After being calibrated and verified, the model was applied to simulate water surface elevations for the existing conditions and for managing the LDD as storage options with design floods. Spillways have been placed on top of the levees to simulate managed flow into selected Levee and Drainage District (LDD) storage areas along the Lower Part of the Illinois River. Three Levee and Drainage Districts of difference sizes and locations were selected to study the relationship between the flood stage reduction and the sizes of the opening inflow section of the spillways, namely the flood reduction versus the width of the spillway with fixed depth and the reduction of flood stage versus the depth of the section when the width is fixed. The optimal width and depth of the opening sections have been examined for the three selected LDDs. The study was based on the maximum water surface elevation of 100-year design flood. A total of 24 individual Levee and Drainage Districts and combinations of two or a few LDD's have been studied for the reduction of flood stage on the Illinois River.
Year: 2001