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1-hr intervals 12 TIME HR 6hl Bridge affected alignment of currents approaching the bridge approaching the Hwy approaching the lock Barkley Lock BASE TEST bend at mile bend near range cfs Q changes in powerhouse channel Chief of Engineers Controlled elevations Current directions dike directions and velocities downbound tows eddy currents existing conditions Existing Conditions-Modified four powerhouse units ft msl Gage HR RANGE HYDROGRAPH improve indicate left bank lower end lower flows lower guard wall lower lock approach mathematical model maximum velocities minimum tailwater model towboat msl Gage Q Nashville District navigate the reach Navigation conditions negotiate the reach Ohio River path of upbound percent faster placed in operation Plan B-Modified powerhouse releases POWERHOUSE SURGES reach downstream right bank riverward scale ratio sharp bends shown in Plates Tennessee River towboat and tow tows approaching tows could navigate U. S. Army Engineer unit in operation varied water-surface elevations Waterways Experiment Station