Air Flow in Combined Intake and Shaft Spillway

by Alan F. Babb, (M.ASCE), Assoc. Hydr. Engr. and Assoc. Prof. of Civ. Engrg.; Washington State Univ., Pullman, WA,
Jerry P. Schneider, (A.M.ASCE), Civ. Engr.; Dept Water and Power, City of Los Angeles, Los Angeles, CA,
Kenneth Thompson, Asst. Engr.; Univ. of California, Davis, CA,

Serial Information: Journal of the Hydraulics Division, 1973, Vol. 99, Issue 7, Pg. 1097-1108

Document Type: Journal Paper


A combined morning-glory spillway and gated outlet tower planned to operate both with submerged and unsubmerged outlet was designed with the aid of a hydraulic model. In this design, entrained air is permitted to rise to the soffit of the level discharge conduit, and is transported to the exit portal to the reservoir surface by means of a slotted device designed to maintain only small pressure differentials between it and the reservoir, so as to permit air to gradually escape.

Subject Headings: Air flow | Hydraulic design | Water intakes | Shafts | Spillways | Hydraulic models | Air transportation | Reservoirs

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