Clarrie Hall Dam

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Clarrie Hall Dam
Clarrie hall dam mount warning.JPG
Lake Clarrie Hall and Mount Warning
Australia New South Wales relief location map.png
Red pog.svg
Location of Clarrie Hall Dam in
New South Wales
Location Northern Rivers, New South Wales, Australia
Coordinates 28°26′16″S153°18′19″E / 28.43778°S 153.30528°E / -28.43778; 153.30528 Coordinates: 28°26′16″S153°18′19″E / 28.43778°S 153.30528°E / -28.43778; 153.30528
Purpose Water supply
StatusOperational
Construction began1979
Opening date1983
Construction costA$34 million
Owner(s) Tweed Shire Council
Dam and spillways
Type of dam Embankment dam
ImpoundsDoon Doon Creek
Height43 metres (141 ft)
Length175 metres (574 ft)
Elevation at crest61.5 metres (202 ft) AHD
Width (crest)6 metres (20 ft)
Dam volume243 cubic metres (8,600 cu ft)
Spillways 1
Spillway type Ungated concrete chute
Spillway capacity590 cubic metres per second (21,000 cu ft/s)
Reservoir
CreatesLake Clarrie Hall
Total capacity16,000 megalitres (570×10^6 cu ft)
Active capacity15,000 megalitres (530×10^6 cu ft)
Inactive capacity10,000 megalitres (350×10^6 cu ft)
Catchment area 60.2 square kilometres (23.2 sq mi)
Surface area220 hectares (540 acres)
Maximum water depth41 metres (135 ft)
Website
[1]

Clarrie Hall Dam is a minor ungated concrete faced rockfill embankment dam with an uncontrolled concrete-lined chute spillway across the Doon Doon Creek, located upstream of the small town of Uki, in the Northern Rivers region of New South Wales, Australia. The main purpose of the dam is for water supply and it creates the artificial Lake Clarrie Hall.

Contents

Location and features

Clarrie Hall dam construction commenced in 1979 and it was opened in 1983 with the unique distinction of being full after heavy rainfall prior to the opening ceremony. It is a minor dam on the Doon Doon Creek, a tributary of the Tweed River, and is located approximately 15 kilometres (9.3 mi) south-west of Murwillumbah. The primary function of the dam is to provide storage of water for Tweed Shire's drinking water supply, [1] by releasing water downstream into Doon Doon Creek when levels of freshwater in the Tweed River fall below 95%, which occurs mostly in winter and spring. Otherwise the natural flows of the Tweed River provide 80% of the water needs of the Shire.

The dam wall height is 43 metres (141 ft) and is 175 metres (574 ft) long. The maximum water depth is 41 metres (135 ft) and at 100% capacity the dam wall holds back 16,000 megalitres (570×10^6 cu ft) of water at 61.5 metres (202 ft) AHD. The surface area of Lake Clarrie Hall is 220 hectares (540 acres) and the catchment area is 60.2 square kilometres (23.2 sq mi). The uncontrolled chute spillway is capable of discharging 590 cubic metres per second (21,000 cu ft/s). [2] The estimated completion cost was A$34 million. [1]

In April 2013, an upgrade of Clarrie Hall Dam commenced, and included widening the existing spillway crest to 35 metres (115 ft) and raising the existing spillway inlet walls and embankment parapet wall by 2 metres (6 ft 7 in). It is expected that the upgrade will be completed during 2014. [3]

Following heavy rainfall in the catchment area, in January 2012 the dam was at its highest level since records commenced in 1986. It was estimated that water was flowing in the range of 2 metres (6 ft 7 in) over the dam spillway. [4]

Recreation

Lake Clarrie Hall provides valuable public recreation including swimming, sailing, boating and freshwater fishing, [1] including sports fishing for Australian bass. Boat access for electric outboard and paddle-powered craft is available at Crams Farm, at the southern end of the waterbody. Lake Clarrie Hall has been stocked with more than 358,000 Australian bass fingerlings over the past 10 years. A fishing licence is required to fish in the lake. [5]

High levels of blue-green algae are common on the lake surface. [1] [6]

Proposed raising of the dam wall

In December 2015, Approval was given by Tweed Shire Council [7] to raise the dam wall by 8.5 metres, doubling its footprint and trebling its capacity. [8] An environmental impact assessment is due to be completed in February 2021, and construction is not expected to begin until December 2023. 12 of 16 properties or part properties had already been purchased for the purpose of the project as of December 2020. [9]

Ecological impact

According to the council's Flora and Fauna Survey and Preliminary Environmental Impact Assessment, 119.66 of the 223.10 hectares due to be inundated is dominated by native vegetation. Rainforest of high conservation value and nine threatened plant species (of which two prefer the area to be inundated) were found in the area to be affected. [10]

Just under half of the native bushland to be inundated is designated key fauna habitat. 25 threatened animal species were discovered and seven of them depend on the tree hollows which were also found in the area due to be inundated. [10]

Cultural heritage and inundation of archaeological sites

Raising the dam wall could affect 81 sites – including campsites, rock shelters, stone artifacts, knapping resources, grinding grooves sites and a possible Aboriginal scarred tree – identified in an Archaeological Assessment and Aboriginal Cultural Heritage Assessment conducted for the council. [11]

See also

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References

  1. 1 2 3 4 5 "Clarrie Hall Dam" (PDF). Tweed Shire Council . Retrieved 15 April 2013.
  2. ↑ "Register of Large Dams in Australia" (Excel (requires download)). Dams information. The Australian National Committee on Large Dams Incorporated. 2010. Retrieved 22 April 2013.
  3. ↑ "Clarrie Hall Dam upgrade" (PDF). Tweed Shire Council . Retrieved 15 April 2013.
  4. ↑ "White alert for Clarrie Hall Dam". Australia: ABC News. 25 January 2012. Retrieved 15 April 2013.
  5. ↑ "Clarrie Hall Dam – Uki". Sweetwater Fishing Australia. 2007. Retrieved 22 April 2011.
  6. ↑ Galliott, Emma (22 March 2013). "Red alert on blue green algae for Clarrie Hall Dam". The Tweed Newspaper. Retrieved 15 April 2013.
  7. ↑ "What's happening with the Clarrie Hall Dam project". Your Say Tweed. Retrieved 1 January 2021.
  8. ↑ "19 archaeological sites to be inundated by dam". Echonetdaily. 8 September 2020. Retrieved 1 January 2021.
  9. ↑ "Environmental Impact Statement for Raising Clarrie Hall Dam". Your Say Tweed. Retrieved 1 January 2021.
  10. 1 2 Tweed Shire Council (October 2017). "FLORA AND FAUNA SURVEY AND PRELIMINARY IMPACT ASSESSMENT FOR THE PROPOSED RAISING OF CLARRIE HALL DAM, TWEED SHIRE, NSW". yoursaytweed.com.au. Archived from the original on 16 March 2021. Retrieved 1 January 2021.
  11. ↑ Navin Officer Heritage Consultants (June 2018). "Proposed Raising of Clarrie Hall Dam, Murwillumbah NSW: Archaeological Assessment and Aboriginal Cultural Heritage Assessment". yoursaytweed.com.au. Archived from the original on 16 March 2021. Retrieved 1 January 2021.
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