Kouhrang 3 Dam

The Kouhrang 3 Dam (سد کوهرنگ ۳, also known as Birgan dam بیرگان) is an arch dam currently under construction on the Kouhrang River in Chaharmahal and Bakhtiari Province, Iran. It is located about 12 km (7.5 mi) northwest of Dashtak. The purpose of the dam is water supply and river regulation. Upstream of the dam will be the intake for the 23 km (14 mi) Kouhrang 3 Tunnel which will transfer water northeast to the Zayandeh River for use in major cities like Isfahan.[2][3] Sabir Co. was awarded the contract for the dam's construction in February 2011 and construction began that same year.[4] The diversion tunnels for the dam were completed in March 2013. The project was scheduled for completed in 2015.[5]

Kouhrang 3 Dam
Location of Kouhrang 3 Dam in Iran
Country	Iran
Coordinates	32°13′56.56″N 50°20′32.37″E
Status	Under construction
Construction began	2011
Dam and spillways
Type of dam	Arch
Impounds	Kouhrang River
Height	135 m (443 ft)
Length	235 m (771 ft)
Width (crest)	5 m (16 ft)
Width (base)	23 m (75 ft)
Reservoir
Total capacity	650,000,000 m3 (526,964 acre⋅ft)[1]

As of July 2017, the project was not yet complete, though the tunnel was considered 97% finished, and newly allocated funds were expected to allow imminent completion.[6] It is claimed that construction of the tunnel in difficult geological conditions has led to drying up of springs, and the estimated transfer volume has been reduced from 270-300 to 40-130 million cubic metres per year. [7]