Latyan Dam and Hydroelectric Plant
Dam and hydroelectric scheme, 290 million m3/year of drinking water for Tehran through a 9.5 km tunnel to the Tehranpars treatment plant and about 160 million m3/year for the Varamin plain; 45 MW in two vertical Francis units of 22.5 MW and about 70 GWh/year; regulable volume raised to 410 million m3 once transfers from Lar Dam began; dam 107 m high from foundation and 80 m from the river bed with a 450 m crest in Iran.
Operational
The record
- Country
- Iran
- Location
- Tehran
- Coordinates
- 35.790, 51.679
- Technology
- Dam and hydroelectric scheme
- Capacity
- 290 million m3/year of drinking water for Tehran through a 9.5 km tunnel to the Tehranpars treatment plant and about 160 million m3/year for the Varamin plain; 45 MW in two vertical Francis units of 22.5 MW and about 70 GWh/year; regulable volume raised to 410 million m3 once transfers from Lar Dam began; dam 107 m high from foundation and 80 m from the river bed with a 450 m crest
- Capital cost
- —
- Stage
- Operational
- Owner or client
- Tehran Regional Water Company
- Contractor
- —
- Operator
- Tehran Regional Water Company
- Finance
- Government of Iran
- Award or start year
- 1963
- Commissioned
- 1967
Record last checked 2026-09-20.
History
- 1959
dam studies begin (Iranian year 1338)
- 1963
construction begins (1342)
- 1967
the dam enters service (1346)
- 1988
transfers from Lar Dam through the 20 km Lar to Kalan tunnel begin, averaging 140 million m3/year (1367)
Sources
5 references
Every field in the record above is taken from the references below. A field that none of them confirms prints as a dash.
- Tehran Regional Water Company, Latyan dam operations office (static page, Persian). thrw.ir.
- Gives the history, the site on the Jajrud 35 km north-east of Tehran and 5 km from Jajrud with a mean annual flow of 350 million m3, the purposes and volumes above, the Kalan power plant 20 km upstream, and the dimensions: crest 450 m long and 9 m wide, 99 m wide at the river bed, 80 m high from the river bed and 107 m from foundation, two outlet gates totalling 100 m3/s, a tunnel and open-chute gated spillway of 1,100 plus 650 m3/s, an intake of 80 m3/s and a design life of 100 years; a regulating dam of concrete and dry masonry 1 km downstream, 45 m high from foundation and 30 m from the river bed, 88 m long in concrete and 65 m in masonry.
- The same page prints the catchment as 69,800 km2, which is not credible for the Jajrud and is not used here.
- Tehran Regional Water Company, hydroelectric power plants (static page, Persian). thrw.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.
Gives Latyan as two vertical Francis units of 22.5 MW with average annual generation of 70 GWh.