Wivenhoe Dam

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Wivenhoe Dam
Location Queensland
Coordinates 27°23′39″S 152°36′29″E / -27.3941, 152.608
Lake type reservoir
Primary inflows Brisbane River
Primary outflows Brisbane River
Catchment area 5554 km²
Basin countries Australia
Surface area 109.4 km²
Max. depth 67 m
Water volume 1,160,000 ML
Shore length1 462 km
Surface elevation 67.00 m
1 Shore length is not a well-defined measure.

Wivenhoe Dam is a dam built across the Brisbane River that creates the artificial Lake Wivenhoe. The dam is located about 80 kilometres by road from the centre of Brisbane, Queensland, Australia.

The dam holds a volume of water two and a half times the water in Sydney Harbour. The primary purpose of the dam is to provide a water storage for south-eastern Queensland as well as extra storage for mitigation of periodic flooding of the Brisbane River. The lake also forms part of the water storages for the Wivenhoe Power Station.

Contents

[edit] Purpose

The dam was designed as a multifunctional facility and built in the late 1970s - early 1980s by a consortium of construction companies including Thiess.

Its primary function is to provide a safe water supply to the people of Brisbane and adjacent regions. Additionally, Wivenhoe Dam serves as;

  • the lower storage in a pumped-storage, hydro-electric generating facility, the Wivenhoe Power Station.
  • the upper reservoir is formed by Splityard Creek Dam, of earth and rock construction, with a capacity of 28 700 megalitres.
  • Under normal conditions the dam supplies water via pipeline to both Tarong Power Station and Tarong North Power Station, but due to drought conditions only supplies water to Tarong North.
  • during a flood the dam is designed to hold back 1.45 million megalitres of additional water for flood mitigation.
  • Lake Wivenhoe is also a camping and outdoor recreation destination. The managed camping facilities at Captain Logan Camp include hot showers, barbecues and toilets, and are adjacent to playgrounds, kiosk, boat hire and boat ramps at Logan Inlet.

[edit] Fishing

A Stocked Impoundment Permit is required to fish in the dam[1].

[edit] Key facts

Wivenhoe Dam consists of an earth and rock embankment 2.3 kilometres long and 50 metres high. It has a concrete spillway section on which five steel crest gates are installed. The gates, at 12 metres wide and 16.6 metres high, are amongst the largest of their type in the world.

The dam has a total storage capacity of 2.61 km³, of which 1.16 km³ is used for urban water storage. 200 properties were acquired to provide the 337.50 square kilometres of land required for the dam. The catchment area is 5,554 square kilometres.

The dam holds twice as much water as Sydney Harbour and is about seven times bigger than Hinze Dam at the Gold Coast. Wivenhoe Dam does contribute to the Gold Coast's water supply.


[edit] Statistics

  • Average annual rainfall: 940 mm
  • Capacity – water supply: 1 165 000 ML
  • Capacity – flood storage: 1 450 000 ML
  • Submerged area at full supply level: 109.4 km²
  • Stream Bed Level at Structure (AHD): 23 m
  • Embankment or Crest Level (AHD): 79 m
  • Type of Structure: Embankment (4 000 000 m³) and Concrete (140 000 m³)
  • Year of Completion: 1985
  • Length of Wall: 2 300 m
  • Spillway Gates: 5 x 12.0 m x 16.6 m
  • Regulator Valves: 2 x 1.5 m diameter
  • Average Evaporation (mm/year): 1 872
  • Hydro Electric Station/dam structure: 4.5 megawatts
  • Design: Queensland Water Resources Commission

Source

[edit] Construction

Wivenhoe was initially investigated for a dam site in the 1890s and again in 1933[2]. Further investigations into a dam began in the mid 1960s. In November 1971, Government approval was given to proceed with construction. Acquisition of lands of the submerged portion of the dam began in March 1973. In 1976 the Government gave approval to proceed with construction of the pumped storage hydro-electric scheme. Total cost for the hydro-electric project was $450 million.

[edit] See also

[edit] References

  1. ^ Fishing in Queensland dams? You may need a permit.
  2. ^ Queensland Environmental Protection Agency, Heritage Trails of the Great South East, State of Queensland, 2000 ISBN 0-7345-1008-X

[edit] External links

Coordinates: 27°23′40″S 152°36′32″E / -27.39444, 152.60889


* This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)


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