Hinze Dam

Hinze Dam
250px Spillway tower of Hinze Dam following Stage 3 upgrade, 2011
Location of the Hinze Dam in Queensland
Country	Australia
Location	South East Queensland
Coordinates
Purpose	Potable water supply Flood mitigation
Status	Operational
Opening date	1976 (1976) (Stage 1) 1989 (1989) (Stage 2) 2011 (2011) (Stage 3)
Operator(s)	SEQ Water
Dam and spillways
Type of dam	Embankment dam
Impounds	Nerang River
Height	108 m (354 ft)
Length	1,850 m (6,070 ft)
Dam volume	4,261×10^3 m3 (150.5×10^6 cu ft)
Spillway type	Uncontrolled
Spillway capacity	550 m3/s (19,000 cu ft/s)
Reservoir
Creates	Advancetown Lake
Total capacity	310,730 ML (6.835×1010 imp gal; 8.209×1010 US gal)
Catchment area	207 km2 (80 sq mi)
Surface area	1,500 ha (3,700 acres)
Normal elevation	82 metres (269 ft) AHD
Website www.seqwater.com.au

The Hinze Dam is a rock and earth-fill embankment dam with an un-gated spillway across the Nerang River that is located in the South East region of Queensland, Australia. The main purpose of the dam is for potable water supply of the Gold Coast region. The impounded reservoir is called Advancetown Lake.

Hinze Dam was named in honour of the Hinze family who lived in the valley that was flooded by the dam.

Location and features

The dam is located 15 kilometres (9.3 mi) south-west of Nerang immediately downstream of the confluence of the Nerang River and Little Nerang Creek.

The earthfill dam structure is 108 metres (354 ft) high and 1,850 metres (6,070 ft) long. The 4,261-thousand-cubic-metre (150.5×10^⁶ cu ft) dam wall holds back the 310,730-megalitre (6.835×10¹⁰ imp gal; 8.209×10¹⁰ US gal) reservoir when at full capacity. From a catchment area of 207 square kilometres (80 sq mi) that includes the Numinbah Valley and Springbrook Plateau, with most being contained within state forests and national parks, the dam creates Advancetown Lake, with a surface area of 1,500 hectares (3,700 acres). The uncontrolled un-gated spillway, located at 82 metres (269 ft) above sea level, has a discharge capacity of 550 cubic metres per second (19,000 cu ft/s). Initially managed by the Gold Coast City Council up until 2008, the dam is now managed by Seqwater.

The dam also provides the benefit of flood mitigation to populated areas along the Nerang River downstream of the dam.

Construction

The Southport Town Council planned the dam in 1947. It was completed in 1976 and expanded in 1989 and 2011.

Stage One was completed in 1976, and provided 42,400 megalitres (9.3×10⁹ imp gal; 1.12×10¹⁰ US gal) of potable water storage and supply.

Stage Two was completed in 1989, when storage of potable water was increased to 161,070 megalitres (3.543×10¹⁰ imp gal; 4.255×10¹⁰ US gal). This stage was completed at a cost of A$42 million and involved raising the main embankment, spillway and intake towers by approximately 18 metres (59 ft) to create a surface area of 9.72 square kilometres (3.75 sq mi).

In 2004 the Gold Coast City Council resolved to construct Stage 3 of the dam. When the dam reached full capacity, on 7 January 2008 work began on Stage 3 and was completed on 19 December 2011. After nearly four years of construction the construction cost was A$395 million. The Stage 3 works increased the height of the dam wall from 93.5 metres (307 ft) to 108 metres (354 ft), and increased the reservoir capacity from 161,070 megalitres (3.543×10¹⁰ imp gal; 4.255×10¹⁰ US gal) to 310,730 megalitres (6.835×10¹⁰ imp gal; 8.209×10¹⁰ US gal), with the added purpose of flood mitigation, beyond water supply. Stage 3 construction was completed by the Hinze Dam Alliance, a joint venture between Seqwater, with private sector partners URS Corporation, Sinclair Knight Merz and Thiess. The additional works with a higher dam wall provided 4,500 homes below the dam wall with flood protection from a 1974 Brisbane–style flood event.

Recreation

Advancetown Lake is a popular recreational facility for Gold Coast residents. Since the Stage 3 upgrade, recreational activities allowed include walking, electric or manual-powered boating, fishing, biking and horse riding. The facilities are open from 6 am to 6 pm daily. No camping is permitted around the lake. Dogs are also not permitted, while swimming has been strongly discouraged. An interpretive centre was opened on 19 December 2011, along with new parking, walking trails, toilet facilities and barbecue areas.

The final design of the dam was criticised in the media and by residents and politicians, some describing it as a "concrete bunker". The criticism arose because of a reduction in playground, boating and barbecue facilities; the banning of dogs; the extensive use of concrete; and because many of the facilities are either far from the water's edge or below the dam wall with no water views.

Advancetown Lake has two boat ramps, one on the western and another on the eastern side.

Fishing

The dam is stocked with Mary River cod, silver perch, golden perch, southern saratoga and bass, while spangled perch are also present naturally. Banded grunter have been found in the lake and being illegally introduced, it is recommended that, if caught, they should be destroyed. A Gold Coast City Council permit is required to fish in the dam. A Queensland State Government Stocked Impoundment Permit is not required.

2018 Commonwealth Games

The Gold Coast is to host the 2018 Commonwealth Games. The area surrounding the Hinze Dam was originally proposed as the location for the mountain bike competition. A new course was constructed to meet international competition requirements. Some government representatives as well as some mountain bikers have sought to have the competition moved away to the unsecured trails at Nerang State Forest. The Gold Coast Mountain Bike Club maintain the course and host a race on the circuit the first Sunday of each month.

See also

• Sports on the Gold Coast, Queensland
• List of dams in Queensland

Gallery

• Hinze Dam (Queensland) - Spillway.png

  Hinze Dam spillway, following Stage 3 upgrade.

• Hinze Dam - Open Space (December 2011).png

  Open space, following completion of Stage 2 upgrade.

• Hinze Dam Spillway overflows.jpg

  The Hinze Dam spillway overflows for the first time since the Stage 3 upgrade was completed, after heavy rain from Cyclone Oswald in January 2013.