ICHE-2008 edition:8 location:Nagoya, Japan date:8-12 September 2008
Flushing devices are considered to be effective in removing settled particles from urban drainage networks and are becoming more frequently used. Modelling analyses with InfoWorks CS software were carried out to investigate the influence of sewer network design and sediment characteristics on the efficiency of a certain type of flushing device. The simulations were done for a sewer network composed of a series of connected pipes with identical diameters with a flushing device installed at the upstream part of the network and for various combinations of pipe diameters (300 mm & 400 mm), pipe slopes (2 mm/m & 3 mm/m), sediment particles (d50 equal to 0.2 and 0.3 mm), sediment concentration (50 mg/l & 100 mg/l), and dry weather flow (DWF) (0.005 m3/s & 0.008 m3/s). The DWF, sediment particle size and the slope of the sewer pipes have major effect in modifying the sediment bed and in predicting the sediment bed formation. Besides, the effect of flush intervals has proved to be an influencing parameter.