Maneri Dam
Encyclopedia
The Maneri Dam is a concrete gravity dam on the Bhagirathi River
located at Maneri, 8.5 km (5 mi) east of Uttarkashi
in Uttarkashi district, Uttarakhand
, India
. The primary purpose of the dam is to divert water into a tunnel which feeds the 90 MW run-of-the-river Tiloth Power Plant.
, the second stage, was halted in 1990 due to funding issues and was not restarted until 2002. It was eventually completed and commissioned by 2008.
is located on its crest and is controlled by four tainter gate
s. In addition to discharge tunnel, the spillway has a maximum discharge capacity of 5000 m3/s. The dam's reservoir
has a 600000 cubic metre capacity, of which 510000 cubic metre is active (or "useful") capacity. Water supplied to the power station is first diverted from the Bhagirathi River by the dam into a 8.6 km (5 mi) long tunnel directly behind the dam. The difference in elevation between the barrage and the power station affords a design hydraulic head
of 147.5 m (484 ft) and gross head of 180 m (591 ft). Near the Tiloth Power Plant at 30°43′36"N 78°26′44"E, the tunnel splits into three penstock
s to power each of the three 30 MW Francis turbine
-generators before being discharged back into the river. The design discharge of the power station is 71.4 m3/s.
Bhagirathi River
The Bhāgīrathī is a turbulent Himalayan river in the state of Uttarakhand, India, that is the source stream of the Ganges—the major river of the Gangetic plain of Northern India and the holy river of Hinduism.-Etymology:...
located at Maneri, 8.5 km (5 mi) east of Uttarkashi
Uttarkashi
Uttarkashi, meaning Kashi of the north, is a holy town in Uttarakhand, India. It is the district headquarter of Uttarkashi district. Uttarkashi is situated on the banks of river Bhagirathi at an altitude of 1352 m above sea level. Uttarkashi is home to a number of ashrams and temples and also to...
in Uttarkashi district, Uttarakhand
Uttarakhand
Uttarakhand , formerly Uttaranchal, is a state in the northern part of India. It is often referred to as the Land of Gods due to the many holy Hindu temples and cities found throughout the state, some of which are among Hinduism's most spiritual and auspicious places of pilgrimage and worship...
, India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...
. The primary purpose of the dam is to divert water into a tunnel which feeds the 90 MW run-of-the-river Tiloth Power Plant.
Background
The power station is stage one of the Maneri Bhali Hydroelectric Project which was planned in the 1960s. It was completed and commissioned in 1984. Dharasu Power StationDharasu Power Station
The Dharasu Power Station is a run-of-the-river hydroelectric power station on the Bhagirathi River located at Dharasu in Uttarkashi district, Uttarakhand, India. The power station was commissioned in 2008 and has a 304 MW capacity.-Background:...
, the second stage, was halted in 1990 due to funding issues and was not restarted until 2002. It was eventually completed and commissioned by 2008.
Design and operation
The Maneri Dam is a 39 m (128 ft) tall and 127 m (417 ft) wide gravity dam with a structural volume of 13700 m³ (17,919 cu yd). It's spillwaySpillway
A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically being the river that was dammed. In the UK they may be known as overflow channels. Spillways release floods so that the water does not overtop and damage or even destroy...
is located on its crest and is controlled by four tainter gate
Tainter gate
The Tainter gate is a type of radial arm floodgate used in dams and canal locks to control water flow. It is named for Wisconsin structural engineer Jeremiah Burnham Tainter....
s. In addition to discharge tunnel, the spillway has a maximum discharge capacity of 5000 m3/s. The dam's reservoir
Reservoir
A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...
has a 600000 cubic metre capacity, of which 510000 cubic metre is active (or "useful") capacity. Water supplied to the power station is first diverted from the Bhagirathi River by the dam into a 8.6 km (5 mi) long tunnel directly behind the dam. The difference in elevation between the barrage and the power station affords a design hydraulic head
Hydraulic head
Hydraulic head or piezometric head is a specific measurement of water pressure above a geodetic datum. It is usually measured as a water surface elevation, expressed in units of length, at the entrance of a piezometer...
of 147.5 m (484 ft) and gross head of 180 m (591 ft). Near the Tiloth Power Plant at 30°43′36"N 78°26′44"E, the tunnel splits into three penstock
Penstock
A penstock is a sluice or gate or intake structure that controls water flow, or an enclosed pipe that delivers water to hydraulic turbines and sewerage systems. It is a term that has been inherited from the technology of wooden watermills....
s to power each of the three 30 MW Francis turbine
Francis turbine
The Francis turbine is a type of water turbine that was developed by James B. Francis in Lowell, Massachusetts. It is an inward-flow reaction turbine that combines radial and axial flow concepts....
-generators before being discharged back into the river. The design discharge of the power station is 71.4 m3/s.