Project Title : Tangab Reservoir Dam (Rockfill Dam with Oblique Clay Core)

Start Date :

Contract No.1                   2002

Contract No.2                   2008

Contract No.3                   2012

Contract No.4                   2014

End Date :

Contract No.1                   2008

Contract No.2                   2012

Contract No.3                   2014

Contract No.1                   2015

Height of dam from foundation: 55 m

Length of crest: 270 m

Earth works: 2,300,000 m3

Steel works: 5,000 ton

Concrete: 120,000 m3

Diversion system consists of two earth filled cofferdams (as parts of dam body) and diversion tunnel

Length of diversion tunnel: 330 m

Lateral spillway with ogee

Ogee length: 150 m

Grouting galleries: 2,800 m

Cutoff wall: 3,600 m2

Water curtain and consolidation grouting: 180,000 m

Employer

Fars Regional Water Authority

Engineer

Ab-Niru Consulting Engineers

Total Updated Contract Prices

115,000,000 USD

Reservoir Volume

180,000,000 m3

Annual Water Discharge

120,000,000 m3

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Prices

201,000,000 USD

This dam located at 90 km south east of Shiraz city near Firouzabad town, over Firouz-abad River. Main purpose of the project is supplying irrigation water to Firouz-abad area.

Unique experience

In this project a special method has been used for water tightening foundation. It has been construction of the water curtain involving drilling parallel boreholes in order to wash the fine compacted soil particles out of fractured and fissured rock and the alluvium layer between the bottom of the cut-off wall and the bedrock. Another useful and time-saving technique utilized in the project was the excavation of a 770 meter long grouting gallery about 40 meters under the river bed to be used for drilling the upward boreholes for washing out the fine particles. The gallery was also used for grouting cement grout through the alluvium.