Red River Waterway, La., Tex., Ark., and Okla., Mississippi River to Shreveport, La., Reach, Lock and Dam Number 1; Hydraulic Model Investigation.

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. Several stilling basin designs were developed for various spillway crest heights to provide satisfactory flow conditions for both normal and emergency operating conditions. 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.