Proceedings of the 11th International Conference on “Urban Drainage”
International Conference on “Urban Drainage” edition:11th location:Edinburgh, Scotland date:31 Aug. - 5 Sept. 2008
Accumulation of in-sewer sediments often causes problems such as loss of hydraulic capacity of sewers. Designing sewer systems to be self-cleansing is however not always possible due to the prevailing conditions. The use of flushing devices that generate controlled flush waves
could be an appropriate solution. In the paper the effect of such devices to remove the settled particles from sewer pipes has been investigated. The research focuses on the hydraulic characteristics of the flushing tank and evaluates eroding capabilities of the generated flush
waves utilizing the InfoWorks CS model (Wallingford Software, UK). Emphasis is given to simulation-based assessment of spatially distributed shear stresses throughout the sewer network and the specific effects on in-sewer sediment transport. Appropriate implementation
of these flushing devices in various locations of a sewer network and their impact over sediment bed modifications is studied. The sediment characteristics influence the overall
effect of flushes in the network. The results indicate that attaining the self-cleansing criterion could not be satisfied in all parts of the considered sewer network. However, the capability of such devices for sediment removal in sewer networks is well accounted for.