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Benmore Dam information


Benmore Dam
Benmore Dam is located in New Zealand
Benmore Dam
Location of Benmore Dam in New Zealand
LocationCanterbury Region, New Zealand
Coordinates44°33′50.92″S 170°11′49.92″E / 44.5641444°S 170.1972000°E / -44.5641444; 170.1972000
Construction cost$62 million
Dam and spillways
Type of damEarth-filled dam
ImpoundsWaitaki River
Height110 m (360 ft)
Length823 m (2,700 ft)
Width (crest)10.6 m (35 ft)
Width (base)490 m (1,610 ft)
Dam volume28 million tonnes
Spillway capacity3,400 km3 (820 cu mi)
Reservoir
CreatesLake Benmore
Total capacity1.25 km3 (1,010,000 acre⋅ft)
Surface area75 km2 (29 sq mi)
Maximum water depth102 m (335 ft)
Power Station
Operator(s)Meridian Energy
Commission date1965
Hydraulic head92 m (302 ft)
Turbines6 x 90 MW (120,000 hp)
Installed capacity540 MW (720,000 hp)
Annual generation2,215 GWh (7,970 TJ)

Benmore Dam is the largest dam within the Waitaki power scheme, located in the Canterbury Region of New Zealand's South Island. There are eight other power stations in the Waitaki Power Scheme.

The dam is the largest earth-fill (zoned embankment dam) water-retaining structure in New Zealand. Its core is low permeability clay material, supported by two massive shoulders of river gravel. Lake Benmore has a volume of 1.25 billion cubic metres, about 1.5 times as much water as Wellington Harbour. The dam's spillway can cope with over 6,000 cubic metres of water per second, about 20 times the mean river flow.

Dam of Benmore hydropower station
Lake below Benmore hydropower station

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