Combined Sewage Storage Tunnel (CSST)
10 project sites throughout Ottawa. Project Details Requirements Reduce the risk of basement flooding for several low-lying lands in the Glebe/O’Connor area Increase operational flexibility and redundancy to major collector sewers Construct 15 major access shafts, five drop structures, six flow diversion chambers, four odour control facilities Install two inter-connected storage tunnels, 6.2km long Divert 43,000m3 of sewer overflow














