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Abstract Fall manholes either are drop manholes or vortex drops. Both types are described and their relative domains of application are discussed. Differences in their hydraulic characteristics are thereby outlined. For drop manholes with a maximum drop height of 7 to 10 m, particular attention must be paid to the jet trajectory geometry and the outflow conditions. Problems with air and pulsations are also addressed. For vortex drops, the approach flow conditions are important. The designs of the intake and outlet structures are particularly analyzed, and questions relating to the air-water flow in the shaft are discussed. All computations required for design are illustrated by examples.
Abstract Fall manholes either are drop manholes or vortex drops. Both types are described and their relative domains of application are discussed. Differences in their hydraulic characteristics are thereby outlined. For drop manholes with a maximum drop height of 7 to 10 m, particular attention must be paid to the jet trajectory geometry and the outflow conditions. Problems with air and pulsations are also addressed. For vortex drops, the approach flow conditions are important. The designs of the intake and outlet structures are particularly analyzed, and questions relating to the air-water flow in the shaft are discussed. All computations required for design are illustrated by examples.
Fall Manholes
Dr. Hager, Willi H. (author)
Wastewater Hydraulics ; 389-409
2010-01-01
21 pages
Article/Chapter (Book)
Electronic Resource
English
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