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latyan Dam
latyan Dam
	Location of latyan Dam in Iran
Official name	سد لتیان
Location	Lavasan, Tehran Province, Iran
Coordinates	35°47′24.25″N 51°40′42.63″E / 35.7900694°N 51.6785083°E
Purpose	Water supply, power
Status	Operational
Construction began	1963
Opening date	1967
Dam and spillways
Impounds	Jajrood River
Height	107 m (351 ft)
Length	450 m (1,480 ft)
Width (base)	99 m (325 ft)
Reservoir
Total capacity	95,000,000 m3 (77,000 acre⋅ft)
Commission date	1969/1987
Type	Conventional
Turbines	2 x 22.5 MW
Installed capacity	45 MW
	Website; https://thrw.ir/st/66

Latyan Dam (Persian: سد لتيان, also Romanized as Sadd-e Latyān) is a buttress dam on the Jajrood River, located less than 25 km from Tehran in the south of city of Lavasan. It is one of the main sources of water for Tehran metropolitan region. It was constructed between 1963 and 1967. The first generator in the dam's 45 MW hydroelectric power station was commissioned on 17 March 1969, the second on 13 April 1987.^[1]

Geology

Jajrood River basin is located in the southern part of central Alborz mountain range, the rocks of which date from the Palaeozoic era up to the Quaternary period, as below:

Palaeozoic era: The dolomitic rocks, sandstone and limestone. Belong to Devonian, Carboniferous and Permian periods.
Mesozoic era: The sandstone formation and limestones of Teriace and Shemshak (Lower Jurassic) coal formation with sandstone and fossiliferous limestones belong to this era.
Paleogene period: starts with lower and middle Eocene limestone layers with nummulite fossil and continues with the Alborz green layers. (Green tuffs) which is an indication of submarine volcanic, eruptions and were belongs to upper Eocene.
Quaternary period: The basaltic masses in the alluvial deposits which cover a big area in the region belong to this era.

Location within Alborz Range

Map of central Alborz	Peaks:	1 Alam-Kuh
−25 to 500 m (−82 to 1,640 ft) 500 to 1,500 m (1,600 to 4,900 ft) 1,500 to 2,500 m (4,900 to 8,200 ft) 2,500 to 3,500 m (8,200 to 11,500 ft) 3,500 to 4,500 m (11,500 to 14,800 ft) 4,500 to 5,610 m (14,760 to 18,410 ft)	2 Azad Kuh	3 Damavand
	4 Do Berar	5 Do Khaharan
	6 Ghal'eh Gardan	7 Gorg
	8 Kholeno	9 Mehr Chal
	10 Mishineh Marg	11 Naz
	12 Shah Alborz	13 Sialan
	14 Tochal	15 Varavašt
	Rivers:	0
	1 Alamut	2 Chalus
	3 Do Hezar	4 Haraz
	5 Jajrood	6 Karaj
	7 Kojoor	8 Lar
	9 Noor	10 Sardab
	11 Seh Hazar	12 Shahrood
	Cities:	1 Amol
	2 Chalus	3 Karaj
	Other:	D Dizin
	E Emamzadeh Hashem	K Kandovan Tunnel
	* Latyan Dam	** Lar Dam