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Description:
Source: https://erdc-library.erdc.dren.mil/jspui/ ; Tests were conducted on a 1:16.6-scale model of the Tallahala Creek outlet works stilling basin to determine if eddies or other undesirable flow conditions would exist in the stilling basin. The basin consisted of a horizontal apron 90 ft long and 22 ft wide and was connected to the 10-ft-diam outlet by a 56-ft-long transition with sidewalls flared 8.67 on 1. Eddies occurred in the original design basin with discharges of 800 cfs or less and the expected tailwater elevations. The eddies were eliminated by revising the floor and walls of the flared transition. The sidewall flare was changed from 8.67 on 1 to 11.83 on 1 and the 1V-on-8H downsloping floor was changed to a 1V-on-6H upslope for a rise of 4 ft and then a downslope with a curve following the equation x² = 238y. The floor was sloped down laterally 1 ft from the transition center line to each wall. Spray off of the baffle blocks occurred with the design discharge and minimum tailwater with the stilling basin as originally designed. The height of the baffle blocks was increased and an additional row of blocks was added to prevent this type of action.