Hood Inlet for Closed Conduit Spillways

by Fred W. Blaisdell, (F.ASCE), Proj. Supervisor; U. S. Dept of Agric., Agric. Research Service, St. Anthony Falls Hydr. Lab., Mineapolis, Minn.,

Serial Information: Journal of the Hydraulics Division, 1960, Vol. 86, Issue 5, Pg. 7-31

Document Type: Journal Paper

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Inlet is formed by cutting circular pipe at angle and placing pipe so that crown projects beyond invert; capacity and performance of spillway for variations of hood inlet length, conduit slope, wall thickness, and approach conditions are discussed; effect of vortices on spillway capacity is shown and anti-vortex devices are developed; scour in vicinity of hood inlet is determined for various sizes of stone; equations for scour-hole dimensions.

Subject Headings: Inlets (waterway) | Spillways | Conduits | Scour | Pipelines | Walls | Thickness | Slopes

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