Municipality of Tehran had been planning to construct Tehran surface water collection tunnels.Hamoun Consulting Engineers Co. conducted the studies, design and supervision of construction for the following tunnels through three separate contracts:

• Yaser Surface Water Collection Tunnel with the length of 420m in south of Tehran;
• Farmanieh Surface Water Collection Tunnel with the length of 750m in north of Tehran;
• Ghiasvand Surface Water Collection Tunnel with the length of 7200m which is Tehran North-East Main Trunk.