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|Title:||Navigation conditions in vicinity of Walter Bouldin Lock and Dam, Coosa River Project : hydraulic model investigation|
|Authors:||United States. Army. Corps of Engineers. Mobile District.|
Myrick, Carolyn M.
Franco, John J.
Walter Bouldin Lock and Dam
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-84-11.|
Abstract: The Walter Bouldin Lock will be the first navigation lock proposed for development of navigation on the Coosa River Waterway. The lock will be located in the left overbank area of Walter Bouldin Dam. The model investigation was concerned with navigation conditions in the reach, including the Jordan Reservoir, the intake diversion canal, the Walter Bouldin Reservoir, and the Walter Bouldin tailrace. Three fixed models were constructed to an undistorted scale of 1:100 to study navigation conditions at three locations in the reach where navigation difficulties were anticipated. Model A reproduced the Walter Bouldin Lock and Dam, Reservoir, and tailrace. Model B reproduced the Jordan Reservoir and entrance to the intake diversion canal. Model C reproduced the confluence of the Walter Bouldin tailrace and the Alabama River. Results of the investigation indicated the following: (A.) No serious navigation difficulties should be experienced through the Jordan Reservoir and in the entrance to the diversion canal. (B.) Because of high velocities and crosscurrents, navigation conditions could be hazardous through the Bouldin Reservoir when the pool is below el 248.0 even with a 220-ft-wide channel and the bottom at el 233.0. No serious navigation difficulties were indicated with a pool at el 252.0 and a 220-ft-wide channel. (C.) With a steady powerhouse flow of 27,000 cfs and low tailwater, tows with sufficient power to overcome the high-velocity currents could negotiate the powerhouse tailrace and lower lock approach channel without serious difficulties. However, lock emptying and start of powerhouse units would create surges that would be hazardous to navigation within the lock approach channel and in the reach downstream to below the confluence of the tailrace and the Alabama River, particularly with low tailwater. (D.) Hazardous conditions in the lower reach at the entrance to the lock canal could be reduced from 30 min to about 10 min after approach of the surge by increasing lock emptying time to at least 15 min and start of Bouldin powerhouse units at intervals of at least 10 min or by maintaining a high tailwater elevation. Surges hazardous to navigation could also develop when closing down one or more powerhouse units. NOTE: This file is large. Allow your browser several minutes to download the file.
|Appears in Collections:||Technical Report|