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Source: https://erdc-library.erdc.dren.mil/jspui/ ; Tests were conducted on a 1:36-scale model of the Red River Spillway No. 1 to develop a conventional jump-type stilling basin and plans of riprap that would provide adequate protection of the approach and exit channels for emergency (single-gated flows) and normal operating conditions. The spillway consists of a 550-ft length of broad-crested weir controlled by eleven 31-ft-high and 50-ft-wide tainter gates. The original design stilling basin downstream of a spillway with a crest elevation of 4.0 ft did not perform satisfactorily for the single-gate operation. A 6-ft lower (el-20) and 20-ft longer (100 ft total) stilling basin apron with two rows of 10-ft-high by 7-ft-wide baffles and 45-ft-long pier extensions was necessary to provide adequate energy dissipation. Two other stilling basin designs were developed for higher spillway crest elevations of 8 and 11 ft to provide satisfactory flow conditions for both normal and emergency operating conditions. During the course of study, approach elevations of 6, 8, and 11 ft were tested to reveal the effects on the spillway efficiency and tests were conducted with runaway barges to determine if a loose barge loaded to a 9-ft draft could be flushed through the stilling basins. Tests to determine the minimum riprap protection for the exit channel bottom indicated a 300-ft length of protection is required downstream of the basin. A series of tests to determine discharge characteristics revealed that data from a previous model investigation could be used to obtain the discharge coefficients of the Red River spillways, and comparison plots are provided in this report.