Improvement and rehabilitation of the water distribution network in Beirut and its suburbs
The first component includes conveying of water from Joun to Khalde via an underground tunnel where it would be then piped through conventional means (piping through road service corridors) to two storage reservoirs in Hadath and then to a third reservoir in Hazmieh. The Awali-Beirut Water Conveyor sub-components are summarized in Table 3 -21 and their geographical locations are illustrated in Figure 3 -2.
Table 3 21. The Awali-Beirut Water Conveyor Sub-Components
Site Photographs (Appendix C)
Joun Regulation Structure
Set into the hillside by the existing adit access from the Joun tunnel to the hydro-electric power plant.
River crossing by inverted siphon in 2,800 mm internal diameter tunnel. Horizontal length 1140 m; north and south vertical shafts of 116m and 136 m respectively. Washout structure in reinforced concrete discharging 700mm diameter pipe into Nahr Damour (with dechlorination facility for use during washout operation). Option for future local supply of treated water.
Khalde surge shaft
2,800 mm diameter shaft in reinforced concrete with surface venting structure 7 m diameter in reinforced concrete, including improved access road.
Khalde Outlet portal
Ouardaniye-Khalde tunnel termination structure in reinforced concrete and upgraded access road.
Khalde Flow measurement and sampling chamber
Chamber (15m x9m x 6m deep), reinforced concreted, contains isolating/regulating valves, flow meter and has small surface kiosk.
1.9km long, twin 1,400mm diameter pipelines in ductile iron. Immediately downstream of the flow measurement and sampling chamber will be velocity limiting valves which will close in the event of failure of the downstream pipelines.
Khalde distribution chamber
Distribution chamber (22m, 9m, 4.5m deep) in reinforced concrete, contains isolating and regulating valves and has small surface kiosk. Option for future additional local supply of treated water. Washout to local stream.
Pipeline from Khalde distribution chamber to Hadath 90 and 125 reservoirs
7.5km long, 700 mm diameter pipeline in ductile iron (air valves and washouts to local streams). Connections to 90 and 125 reservoirs and for future local supply of 300mm and 500mm diameter pipelines for Kfarshima and Quobe respectively
Hadath 125 reservoir
Storage reservoir at elevation of 125 m, two compartments, effective volume 30,000 m3 in reinforced concrete with isolating valves and small surface kiosk, including access road. Connection to local distribution system.
Hadath 90 reservoir
Storage reservoir at elevation of 90m, two compartments, effective volume 50,000 m3 in reinforced concrete with isolating valves and small surface kiosk, including access road. Connection to local distribution system.
Pipeline from Hadath reservoirs to Hazmieh reservoir
2.7 km long twin 1,300 diameter pipelines in ductile iron, with option for further extension for supply of treated water to Beirut.
Hazmieh 90 reservoir
Storage reservoir at elevation of 90m, two compartments, effective volume 20,000 m3 in reinforced concrete with isolating valves and small surface kiosk, including access road. Connection to local distribution system.
Figure 3 2 Geographic location of project components
Component 2 will comprise the following:
The construction of 16 reservoirs (between 500 m3 and 1000 m3 storage capacity each) and associated pumping stations distributed across the various distribution zones in the project area;
The replacement and/or installation of approximately 187 km of distribution network across the project area in Ein El Delbi, Southern Beirut and parts of the Metn area;
Installation of 200,000 household meters in portions of the project area to be selected by the GBMLWWE and to operate on a volumetric tariff basis;
Installation of bulk meters at the reservoirs and distribution chambers;
Table 3 -22 and Table 3 -23 show characteristics of the above mentioned reservoirs and pumping stations along with areas they serve. This information is to be confirmed in final stages of the design of the second component.