Doha Metro Red Line
Saudi Wastewater Tunnel
Design and construction of 11.9 km of wastewater conveyor tunnels
- Manhoufa, Arabia Saudita
- Environment, Tunnels
- Completed: 2017
- The length of north tunnel is 6856 m;
- the length of south tunnel is 4989 m.
Design and construction of 11.9 km of wastewater conveyor tunnels (north and south tunnels) from Manhoufa Sewage Treatment Plant to Al Hair Sewage Treatment Plant using the TBM method.
Both tunnels are excavated with a double-shield TBM machine.
During excavation, concrete segmental lining was installed, the internal walls are coated with protective PVC or HDPE membrane.