Chichester Dam

Chichester Dam
Lake Chichester
Location New South Wales
Coordinates 32°14.2161′S 151°41.3672′E / 32.236935°S 151.6894533°E / -32.236935; 151.6894533Coordinates: 32°14.2161′S 151°41.3672′E / 32.236935°S 151.6894533°E / -32.236935; 151.6894533
Lake type Reservoir
Primary inflows Chichester River, Wangat River
Primary outflows Chichester River
Catchment area 197 km2 (76.1 sq mi)
Basin countries Australia
Max. length 4.22 km (2.62 mi)
Max. width 580 m (1,902.9 ft)
Surface area 1.8 km2 (444.790 acres)
Max. depth 43 m (141.1 ft)
Water volume 21,500 megalitres
Shore length1 18 km (11.2 mi)
Surface elevation 156.2 m (512.5 ft)
Frozen never
Islands none
Settlements none
1 Shore length is not a well-defined measure.

Chichester Dam is a dam in the Hunter Region of New South Wales approximately 21.6 km (13.4 mi) north of Dungog. It was constructed between 1917 and 1926 as a supply of drinking water for the Hunter Region by damming the Chichester River. The dam contributes about 35 percent of the lower Hunter region's water supply. Its catchment is largely located within the Barrington Tops National Park, and covers 197 km2 (76.1 sq mi), receiving water from the Chichester and Wangat Rivers. The reservoir holds 21,500 megalitres of water and is connected to reservoirs in Maitland, Cessnock and Newcastle by an 80 km (50 mi) long gravitation main. The wall is 254 m (833 ft) long and 43 m (141 ft) high, using a cyclopean system of interlocking concrete blocks and large boulders. The wall is anchored to the bedrock below it by 93 stressed tendons.[1]

History

Construction began in 1917 and finished in 1926. In 1965 the spillway was lowered by 2.75 m (9.02 ft) to increase flood capacity. In 1985 the dam was post tensioned with cables and the spillway was relocated to the centre of the dam and returned to its original height. In 1995 the seepage potential was reduced under the northern abutment and in 2003 an improved dainage system for the dam's foundations was installed and the left parapet wall was raised to prevent overtopping in a major flood.[1]

References

  1. ^ a b "Chichester Dam". Hunter Water. http://www.hunterwater.com.au/281.aspx. Retrieved 2007-11-08. 

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