This project involves the construction of pipelines for the transportation of water from the inland hills south
of Beirut (Joun) to Beirut city center (Hadat). The water comes from a hydroelectric power station that currently discharges into an existing water course running to the sea. More in detail, moving south to north, civil works will include the construction of a connection to an existing and currently unused tunnel, the construction of a discharge chamber, and the excavation of the first tunnel up to Ouardânîyé, where a water purifier (not included in this contract) will be built. From here, a second tunnel will depart to Damour, where an inverted syphon will be built, needed to cross a narrow valley. A third tunnel will then convey water to the village of Khalde (south suburban area of Beirut) and from there, through a cast iron twin pipeline installed in trenches, the Hadat tanks will be reached.
The project is divided into two large parts: tunnels with syphon in the hilly area and underground pipelines in the urban area. The tunnels (called drive 1, 2 3), having a length of km 8.10 - 10.37 - 4.13, respectively, will be excavated using a TBM. An inverted syphon having a drop of 140 m and a U-bend length (two inclined sections and one horizontal section) of approximately 1,140 m will be installed between drives 1 and 2, in Damour. The project will also include two 192 m and 278 m shafts. In the urban area, conversely, a cast iron twin pipeline will be installed. The pipeline will be installed in a trench excavated along the existing roads. Fiber optics as well as a SCADA system will also be installed along the entire path.