Red River Waterway, John H. Overton Lock and Dam. Report 3. Sedimentation Conditions Hydraulic Model Investigation.
1997
McCollum, Randy A.
John H. Overton Lock and Dam, located in a cutoff channel between river miles 89.0 and 86.5 of the Red River, is designed to maintain a narrow pool elevation of 64 (all elevations are in feet referred to National Geodetic Vertical Datum) upstreaan to Lock and Dam 4. The design calls for an 84 ft by 685-ft usable lock chamber and a dam with five 60-ft-wide gates. A movable-bed model study was performed to determine the alignment of the channel and the arrangement of the lock and dam that would provide the most satisfactory channel for both navigation and sediment movement. The movable-bed model was built to a scale of 1:20 horizontally and 1:80 vertically and reproduced the study area from river miles 90.0 to 85.0. The movable bed was molded using crushed coal with a median grain size of 4 mm and a specific gravity of 1.30. The original design for the lock and dam (Plans A and B) used a six-gate dam, maintaining the upper pool at el 58. The darm was redesigned prior to testing of Plan C, going to the final design of five gates, maintaining the upper pool at el 64. Plan C-81 showed a tendency for reduced deposition along the left bank of the upper lock approach. Plan D reduced scour downstream of the lower lock approach, and Plan D-1 also reduced scour but increased deposition along the left bank of the lower lock approach. Plan E prevented shoaling in the upper lock approach, and Plan E-1 would likely increase shoaling compared with the Base Examination conditions.
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