The structure proposed at the head of the Kaskaskia River navigation channel near Fayetteville, Illinois, was designed to provide grade control which is required to permit dredging of the navigation channel and maintain existing water surfaces without aggravating head cutting c:nd upstream bank erosion. A 1:25-scale model investigation was conducted to evaluate the hydraulic performance of the proposed structure including discharge characteristics of the weir, velocities of flow through the structure and in the downstream navigation channel, general flow patterns, and riprap needed for stability of the structure and for protection of the navigation channel. The proposed grade-control structure will be constructed of riprap and an additional 800 ft of bank protection will be provided immediately downstream of the structure. The total structure width will be about 600 ft and will include a trapezoidal weir with a base width of 120 ft at el 364 in the center of the existing Kaskaskia River navigation channel. The original design grade- control structure performed satisfactorily with discharges ranging from 1,000 to 35,000 cfs; however, the headwater was below desirable levels. Several modifications of the weir portion of the structure were developed to maintain existing headwaters and provide satisfactory hydraulic performance. The structural modifications included narrowing the weir from 160 to 120 ft while maintaining the 1V-on-3H side slopes from weir invert el 364 to el 384, and providing a rounded transition to 1V-on-13.3H (right bank) and 1V-on-16H (left bank) side slopes.
Kaskaskia River Grade-Control Structure and Navigation Channel, Fayetteville, Illinois: Hydraulic Model Investigation
Technical Report ; HL-80-20
1980
4265909
Report
Elektronische Ressource
Englisch
Kaskaskia River Navigation Project, Illinois: Hydraulic Model Investigation
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