Monday Dec 16, 2019
Water Transmission Tunnel Delivering the Surplus of the Gelas River to the Lake Urmia Basin
Project name: Water Transmission Tunnel Delivering the Surplus of the Gelas River to the Lake Urmia Basin
Completed
2018/09/30
2019/11/27
Manager

Iran Water and Power Resources Development Co.     

Goals
  • Transmission of the surplus water resources in excess of demands (irrigation, drinking, and industrial water) from Gelas River basin to Lake Urmia; 
  • Controlling and regulating water outflow from the Gelas River basin leaving the country;
  • Controlling and compensating of a portion of water collected from Lake Urmia;
Schedule

Site and Supreme Supervision (3rd Phase)

Executive Actions
  • Excavating a 1354 m access tunnel with a negative 10.2% slope;
  • Excavating a 135-m-long, 15-m-high, and 15-m-wide cavern for disassembling the Tunnel Boring Machine (TBM) inside a granite rock mass;
  • Excavating the first segment—the alluvial part—of the main tunnel with a length of 15 km and a negative slope by a Dual Mode TBM from the entrance portal to the cavern where the TBM was disassembled; 
  • Assembly of the TBM DS at the exit shop;
  • Excavation of the second segment, with a length of 20.2 km, by a TBM DS at a positive slope;
  • Water transfer capacity of the Gelas Tunnel: 646 million cu. m per year. 
Geography Location

Naghadeh, Piranshahr, Southern West Azerbaijan Province, Iran