Kouhrang 3 Dam and Transfer Tunnel
Interbasin transfer tunnel, 255 million m3/year transferable; concrete double-arch dam 135 m high impounding 384.5 million m3; 27,209 m of underground excavation comprising a 23,409 m main tunnel and four adits totalling 3,800 m, bored at 4.90 m circular and 5.40 m horseshoe with an average 35 cm concrete lining; pressurised flow on a gradient of 0.000742 in Iran.
The record
- Country
- Iran
- Location
- Birgan
- Coordinates
- 32.233, 50.342
- Technology
- Interbasin transfer tunnel
- Capacity
- 255 million m3/year transferable; concrete double-arch dam 135 m high impounding 384.5 million m3; 27,209 m of underground excavation comprising a 23,409 m main tunnel and four adits totalling 3,800 m, bored at 4.90 m circular and 5.40 m horseshoe with an average 35 cm concrete lining; pressurised flow on a gradient of 0.000742
- Capital cost
- —
- Stage
- Stalled
- Owner or client
- Isfahan Regional Water Company
- Contractor
- Tabliyeh, Sabir, Sazab Kian Pad, Fadak and Farzad Sazeh
- Operator
- —
- Finance
- Government of Iran
- Award or start year
- 1993
- Commissioned
- —
Record last checked 2026-09-20.
History
- 1993
works begin (start year 1372)
- 2023
the statutory completion year of 1402 passes with the scheme incomplete
- 2026-09
the owner's transparency portal records overall progress at 65 per cent, the tunnel at 98 per cent and the dam at 52 per cent, with dam contracts terminated and a proposed completion date in 1406
Sources
2 references
Every field in the record above is taken from the references below. A field that none of them confirms prints as a dash.
- Isfahan Regional Water Company, transparency portal, construction of the Kouhrang third dam and tunnel. shafaf.esrw.ir.
- MENA Water Review major projects register and PPP pipeline — compiled from procurer publications, development-bank project pages and trade reporting; each record names its source.
Owner's own project record, read in Persian. Location Chaharmahal and Bakhtiari at Birgan in the Karun basin; purpose to supply part of Isfahan province's shortfall; start year 1372 with a statutory completion year of 1402 and a proposed 1405 because of dam watertightness studies; overall progress 65 per cent; the tunnel 98 per cent complete with main lining, adits, outlet structure and outlet gates finished but the inlet structure and its hydromechanical equipment not installed; the dam 52 per cent complete with the executing contractors' contracts terminated under Article 48 of the general conditions of contract over reservoir land acquisition and the current consultant's contract ended; supplementary hydrogeology studies by Shiraz University; credit still needed of 1,505,000 million rials for the tunnel and 50,000,000 million rials for the dam, of which 30,000,000 million rials is land acquisition. The page header still labels the scheme active and under execution, which the body contradicts. The finished tunnel diameter is printed as 10.4 m, which cannot follow from a 4.90 m bore and a 35 cm lining. Coordinates added on 20 September 2026 from OpenStreetMap node 9781712481, named Kouhrang 3 Dam and tagged as under construction, at 32.2330 50.3415 on the Koohrang river. Reverse geocoding returns the Doab Samsami district of Kouhrang county in Chaharmahal and Bakhtiari, the district that contains Birgan. The pin is the dam, not the transfer tunnel, which runs 23.4 km and has no single site.