Lar Dam and Kalan Transfer Scheme
Dam and hydroelectric scheme, 960 million m3 reservoir (940 million m3 useful, 23 million m3 dead) over 17 km2 and 340 million m3/year of regulated water; 115.5 MW at the Kalan power plant in three vertical Francis units of 38.5 MW and about 150 GWh/year; pumping station of 18.5 m3/s; earthfill dam 107 m high from foundation with a 1,150 m crest in Iran.
Operational
The record
- Country
- Iran
- Location
- Amol
- Coordinates
- 35.890, 51.998
- Technology
- Dam and hydroelectric scheme
- Capacity
- 960 million m3 reservoir (940 million m3 useful, 23 million m3 dead) over 17 km2 and 340 million m3/year of regulated water; 115.5 MW at the Kalan power plant in three vertical Francis units of 38.5 MW and about 150 GWh/year; pumping station of 18.5 m3/s; earthfill dam 107 m high from foundation with a 1,150 m crest
- Capital cost
- —
- Stage
- Operational
- Owner or client
- Tehran Regional Water Company
- Contractor
- KSB, Germany (pumping station pumps)
- Operator
- Tehran Regional Water Company
- Finance
- Government of Iran
- Award or start year
- 1974
- Commissioned
- 1982
Record last checked 2026-09-20.
History
- 1951
survey and exploration work begins (Iranian year 1330)
- 1974
dam construction begins (1353)
- 1982
the dam is completed (1361)
- 1988
transfers to Latyan reservoir 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, Lar dam operations office (static page, Persian). thrw.ir.
- Gives the history, the site in Mazandaran 75 km from Tehran and 100 km from Amol, the purposes of irrigation and drinking water supply and of feeding the Kalan power plant, and the figures used here: crest 1,150 m long and 13 m wide, 800 m wide at the base, 105 m high from the river bed and 107 m from foundation, three outlet gates totalling 150 m3/s, a spillway of 1,160 m3/s, a design life of 100 years, reservoir levels of 2,509 m maximum, 2,460 m minimum and 2,432 m at the lake bed, total capacity 960 million m3 with 940 million m3 useful and 23 million m3 dead over a 17 km2 lake, and 340 million m3/year regulable; and a pumping station of 18.5 m3/s built for when gravity transfer is not possible, with a main shaft 65 m deep and 15.5 m finished diameter, intake and outlet tunnels totalling 90 m at 3 m finished diameter, a 1,200 m3 surge chamber ringing the shaft and eight pumps, four of 1,100 kW and four of 880 kW, supplied by KSB of Germany.
- The same page's location table names Pakdasht as the nearest city and gives coordinates of 52.3 and 35.4, neither of which fits the Lar valley; the coordinates here come from OpenStreetMap.
- 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 Kalan as three vertical Francis units of 38.5 MW with average annual generation of 150 GWh.