Ukai Dam

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Ukai dam
Ukai Dam is located in Gujarat
Ukai Dam
Ukai Dam
Official name Ukai Water Resources Project
Country India
Location Surat district and Tapi district
Coordinates 21°14′53.67″N 73°35′21.87″E / 21.2482417°N 73.5894083°E / 21.2482417; 73.5894083Coordinates: 21°14′53.67″N 73°35′21.87″E / 21.2482417°N 73.5894083°E / 21.2482417; 73.5894083
Status Operational
Construction began 1964
Opening date 1972
Construction cost Rs 1389.6 Million
Dam and spillways
Impounds Tapti River
Height (foundation) 80.772 metres (270 ft)
Length 4,927 metres (16,000 ft)
Spillways 22, radial
Spillway type Ogee
Spillway capacity 46,269 m3/s
Creates Vallabhsagar
Total capacity 7,414 MCM
Active capacity 6,730 MCM
Catchment area 62,225 square kilometres (6.7×1011 sq ft)
Surface area 612 square kilometres (6.6×109 sq ft)
Power station
Type Conventional
Hydraulic head 57 metres (190 ft) to 34 metres (110 ft)
Installed capacity 300 MW
Ukai dam

The Ukai Dam, constructed across the Tapti River, is the largest reservoir in Gujarat. It is also known as Vallabh Sagar. Constructed in 1972, the dam is meant for irrigation, power generation and flood control. Having a catchment area of about 62,255 km2 and a water spread of about 52,000 hectares, its capacity is almost same as that of the Bhakra Nangal Dam. The site is located 94 km from Surat.

The storage capacity of Ukai dam is almost 46% of the total capacity of all the other existing dams in Gujarat if put together. Thus it can be concluded that the rest of the dams have as little as 0.1% average storage capacity. During the last 40 years, the actual irrigation potential is attained through all the major and medium water resources projects in the State, which comprises only 14 million hectares.[1]

The dam is an earth-cum-masonry dam. Its embankment wall is 4,927 m long. Its earth dam is 80.77 meters high, whereas the masonry dam is 68.68 meters high. The dam's left bank canal feeds water to an area of 1,522 km2. and its right canal provides water to 2,275 km2 of land.[2]

Ukai Hydro Power Station[edit]

There are four hydro turbine units, each of 75 MW with a total installed capacity of 300 MW. All the above units were made by BHEL. Commissioning dates of units 1 to 4 are: 8 July 1974, 13 December 1974, 22 April 1975 and 4 March 1976.


  1. ^ "Grave danger to Ukai dam: Gujarat govt". The Times of India. 8 August 2006. Retrieved 2 July 2010. 
  2. ^ "Water Resources Projects in the Tapi Basin". Retrieved 2 February 2014.