Tests of the spillway of Oakley Dam were conducted on a 1:60-scale model to determine flow conditions in the approach and exit channels and the performance of various elements of the structure. Particular emphasis was placed on the selection of a stilling basin that would perform satisfactorily with a Froude number (3.0±) of entering flow insufficient for ideal performance of a hydraulic-jump type basin. Approach flow conditions were generally satisfactory and no modifications to the abutments were required. Tests also indicated that stone size selected for wave protection along the upstream embankment would be sufficiently large to protect against velocities at the abutments. The capacity of the spillway was greater than computed; this is attributed to less than anticipated losses at the abutments and the absence of submergence effects of spillway flow. The selection of the type 6 basin for prototype construction was based on economy of construction and reduction of wave action in the exit area. This basin, 70 ft shorter than the original design, utilized a 100-ft-long apron with 6-ft-high chute blocks, one row of 6-ft-high baffle piers, and a 3.5-ft-high end sill. Observations also indicated that the roadway and bridge immediately downstream of the structure do not appear to be endangered at flows up to 25,000 cfs, and stilling basin performance is not impaired by the presence of the roadway and bridge at these discharges. It was determined that riprap protection is required on the embankments and in the exit below the structure.
Spillway for Oakley Dam, Sangamon River, Illinois: Hydraulic Model Investigation
Technical Report ; H-70-13
1970
6193196
Report
Electronic Resource
English
HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1972
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