This 23 km long water transmission tunnel is the third such tunnel in the region (the first was completed in the 1930’s, and the second in the 1980’s) to transmit up to 255 million cubic meters of water from one of the branches of the famous Karun River to the arid central plains of Iran. The tunnel passes through some extremely complicated geological features such as seismic faults and karstic reservoirs with overburdens of up to 1300 meters.
Tablieh as the Main Contractor has utilized a variety of excavation techniques such as Tunnel Boring Machines (TBM), road headers, and drill and blast with a maximum progress rate of 266 meters per month.
| Location | Chahar Mahal Bakhtiari Province |
| Client | Esfahan Regional Water Board |
| Consultant | Zayand Ab Consulting Engineers |
| Tunnel length (D=4.1m) | 23,409 m |
| Adits length | 3,900 m |
| Excavation by TBM | 246,000 m3 |
| Excavation by Drilling and blasting | 270,000 m3 |
| Excavation by road header | 42,000 m3 |
| Concrete | 280,000 m3 |
| Reinforcement | 16,000 ton |
