Performance of Baffled Chute with 90° Bend

by David T. Higgins, (M.ASCE), Assoc. Prof.; Dept. of Civ. and Environmental Engrg., Washington State Univ., Pullman, Wash. 99164,

Serial Information: Journal of the Hydraulics Division, 1981, Vol. 107, Issue 4, Pg. 419-426

Document Type: Journal Paper


The effects of a 90° bend on scour and splash in a baffled chute have been studied in a 1:12 model. The model design followed recommended United States Bureau of Reclamation practice except for the square bend. Various combinations of guide vanes and bend floor elevations were examined in 12-ft and 24-ft (3.7-m and 7.3m) wide chutes carrying 40 cfs/ft (3.7 m³/s/m). The simplest, plain, square bend caused 2.3 ft (0.7 m) more scour depth than does a standard, straight chute. The additional scour may be eliminated by using guide vanes or lowering the bend floor. Sever splash beyond the bend and lower chute walls may require slope protection.

Subject Headings: Scour | Baffles (hydraulic) | Stream channels | Vanes | Floors | Bureau of Reclamation | Walls | Slopes | United States

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