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Title: Spillway for Columbus Lock and Dam, Tombigbee River, Alabama : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Mobile District
Oswalt, Noel R.
Pickering, Glenn A.
Keywords: Hydraulic models
Hydraulic structures
Columbus Lock and Dam
Open channel flow
Water flow
Tombigbee River
Inland navigation
Stilling basins
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-74-13.
Description: Technical Report
Abstract: Tests were conducted on a 1:36- scale model of the Columbus Lock and Dam spillway to determine discharge characteristics of the spillway, stilling basin performance, and riprap requirements downstream from the structure for both normal and single-gate operations. The proposed spillway will consist of five 60-ft-wide bays through which flow will be regulated by tainter gates. Tests to determine discharge characteristics revealed that data obtained in a previous model investigation could be used to determine discharge coefficients for the Columbus spillway. An unsteady flow condition was detected with gated flows when a trench to be excavated during construction was left more than 10 ft lower than the crest of the spillway. Therefore, it is recommended that this area be filled to at least el 128 (elevation is in feet referred to mean sea level) after construction is completed. The stilling basin as originally designed resulted in satisfactory performance during normal operation. However, with only one gate one-half or fully open, performance of the basin was unsatisfactory. Several modifications to the basin were tested in an effort to improve energy dissipation and a stilling basin that provided satisfactory flow conditions was developed. Tests to determine the riprap requirements in the exit channel indicated that the coverage of protection needed was the same whether the gate was one- half or fully open. The size of stone protection was determined for both conditions.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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