Ichari Dam

The Ichari Dam is a concrete gravity dam on the Tons River 13 km (8 mi) north of Dakpathar in Uttarakhand, India. The primary purpose of the dam is hydroelectric power production and it is a run-of-the-river-type. It was completed in 1972. The dam diverts water to the Chibro Power Station (240 MW) which is then returned to the Tons River before being fed to the Khodri Power Station (120 MW).

Ichari Dam
Ichari Dam is located in Uttarakhand
Ichari Dam
Location of Ichari Dam in Uttarakhand
CountryIndia
LocationDakpathar
Coordinates30°36′49″N 77°47′28″E / 30.61361°N 77.79111°ECoordinates: 30°36′49″N 77°47′28″E / 30.61361°N 77.79111°E
StatusOperational
Opening date1972
Owner(s)Uttarakhand Jal Vidyut Nigam Ltd (UJVN)
Dam and spillways
Type of damGravity
ImpoundsTons River
Height59 m (194 ft)[1]
Length155 m (509 ft)
Dam volume181,000 m3 (236,739 cu yd)
Spillway capacity13,500 m3/s (476,748 cu ft/s)
Reservoir
CreatesIchari Reservoir
Total capacity8,930,000 m3 (7,240 acre⋅ft)
Active capacity5,110,000 m3 (4,143 acre⋅ft)
Surface area8 km2 (3 sq mi)
Power Station
Commission dateChibro: 1975
Khodri: 1984
TypeRun-of-the-river
Hydraulic headChibro: 110 m (361 ft)
Khodri: 57.9 m (190 ft)
TurbinesChibro: 4 x 60 MW Francis-type
Khodri: 4 x 30 MW Francis-type
Installed capacityChibro: 240 MW
Khodri: 120 MW

Design and operation

The dam is a 59 m (194 ft) tall and 155 m (509 ft) long concrete gravity type with a structural volume of 181,000 m3 (236,739 cu yd). The dam's spillway is located across its crest and is controlled by seven floodgates. It has a maximum discharge capacity of 13,500 m3/s (476,748 cu ft/s). The dam's reservoir has a 8,930,000 m3 (7,240 acre⋅ft) capacity, of which 5,110,000 m3 (4,143 acre⋅ft) is active (or "useful") capacity. The surface area of the reservoir is 8 km2 (3 sq mi).[2]

Chibro Power Plant

Adjacent to the dam and on its left bank, water is diverted into a 6.2 km (4 mi) head-race tunnel which leads south to the underground power station at 30°33′23″N 77°47′53″E / 30.55639°N 77.79806°E. There, the water powers four 60 MW Francis turbine-generators. The design hydraulic head of the station is 110 m (361 ft) and its design discharge is 200 m3/s (7,063 cu ft/s). The plant was commissioned in 1975 and was the first power plant built underground in Northern India.[3]

Khodri Power Plant

Water discharged from the Chibro Power Plant is returned into the Tons River just 100 m (328 ft) upstream of the intake for the Khodri Power Station. Water enters the intake and then travels south down a 7.5 km (5 mi) head-race tunnel which leads to the power station on the Yamuna River at 30°30′30″N 77°47′59″E / 30.50833°N 77.79972°E. There, the water powers four 30 MW Francis turbine-generators before being discharged into a tail-race channel behind the Dakpathar Barrage. The design hydraulic head of the station is 57.9 m (190 ft) and its design discharge is 200 m3/s (7,063 cu ft/s). The plant was commissioned in January 1984.[4]

See also

References

  1. ^ "Anchoring slopes in the Himalayas". International Water Power & Dam Construction. 16 January 2008. Retrieved 10 July 2011.
  2. ^ "India: National Register of Large Dams 2009" (PDF). Central Water Commission. Archived from the original (PDF) on 21 July 2011. Retrieved 10 July 2011.
  3. ^ "Chibro Power Plant (4x60=240MW)". Uttaranchal Jal Vidyut Nigam Limited. Archived from the original on 24 November 2009. Retrieved 10 July 2011.
  4. ^ "Khodri Power Plant (4x30=120 MW)". Uttaranchal Jal Vidyut Nigam Limited. Archived from the original on 27 December 2009. Retrieved 10 July 2011.
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Kishau Dam

The Kishau Dam is a proposed gravity dam on the Tons River which will straddle the border between the Indian states of Himachal Pradesh and Uttarakhand. The project site is located about 39 km (24 mi) north of Dakpathar and upstream of the Ichari Dam. The primary purpose of the dam is power generation and downstream water supply. It will support a 660 MW power station and provide water for the irrigation of 97,076 ha (239,880 acres) of crops.

After years of negotiations over water-sharing between the two states, the dam is currently awaiting clearance from the Ministry of Environment and Forests. Construction was originally expected to begin in 2015. Approval was granted in 2018. Completion is slated for 2023.

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