IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 4: Responding to Shifting Water Resources : Performance of circular drop manholes in ventilation absence
Performance of circular drop manholes in ventilation absence
Author : F. Granata1, G. de Marinis1, R. Gargano1 and W.H. Hager2
A suitable ventilation is required for urban sewer systems to ensure that aerobic conditions are preserved within the system, and to prevent sulphate reduction and the risk of explosive gas development. However, the passive ventilation of urban drainage systems does generally not assure adequate air supply. This shortage of ventilation may also affect the hydraulic performance of sewers, particularly if drop manholes are implemented. This paper discusses the effects of ventilation absence on the hydraulics of circular drop manholes, with a particular reference to pool depth, energy dissipation and the choking risk in the downstream sewer. The results were obtained from an experimental research conducted at the University of Cassino on three manhole models of different sizes. The effects of the main hydraulic and geometric parameters were considered to present improved design information for sewer systems.
File Size : 2,247,401 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 4: Responding to Shifting Water Resources
Date Published : 01/07/2011
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