Old River Diversion, Mississippi River. Report 4. Outflow Channel Investigations
Abstract
The outflow channel investigation was conducted to study possible means of repairing damage to or preventing future conditions that could endanger the stability of the low-still structure. The 1:20-scale undistorted fixed-bed model was used to study flow conditions during rehabilitation of damage to the stilling basin, the need for additional scour protection in the outflow channel below the stilling basin, a means of controlling the tailwater of the low-still structure, and the possibility of replacing the left down-stream wing wall with a rock structure if the existing wing wall were to fail. Results of the studies indicated no adverse flow conditions would be produced by the closing required during partial completion of the stilling basin rehabilitation work. Scour velocities in the unprotected areas of the outflow channel could be expected to reach 10 fps. The two types of tailwater control structures, rock weirs and concrete piling schemes, would not satisfactorily control the low-still structure tailwater as desired and would severely limit or prevent navigation to the area below the structure. If failure of the left downstream wing wall occurs, a rock structure could be used as a satisfactory replacement.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1989
- Accession Number
- ADA207019
Entities
People
- C. R. Nickles
- T. J. Pokrefke Jr.