Wyaralong Dam
| Wyaralong Dam | |
|---|---|
The dam wall, from the viewing platform.
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 Location of the Wyaralong Dam
in Queensland |
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| Country | Australia |
| Location | South East Queensland |
| Coordinates | 27°54′33″S 152°52′52″E / 27.90917°S 152.88111°ECoordinates: 27°54′33″S 152°52′52″E / 27.90917°S 152.88111°E |
| Purpose | Potable water supply |
| Status | Operational |
| Construction began | 2010 |
| Opening date | 2011 |
| Construction cost | A$380 million |
| Operator(s) | SEQ Water |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | Teviot Brook |
| Height | 48 m (157 ft) |
| Length | 490 m (1,610 ft) |
| Dam volume | 218,300×103 m3 (7,710×106 cu ft) |
| Spillway type | Uncontrolled |
| Reservoir | |
| Total capacity | 102,883 ML (22,631×106 imp gal; 27,179×106 US gal) |
| Catchment area | 546 km2 (211 sq mi) |
| Surface area | 1,230 ha (3,000 acres) |
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Website www |
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The Wyaralong Dam is a mass concrete gravity dam with an un-gated spillway across the Teviot Brook that is located in the South East region of Queensland, Australia. The main purpose of the dam is for supply of potable water for the Scenic Rim region. The impounded reservoir is also called Wyaralong Dam. The dam was initiated by the Queensland Government in 2006 as a result of a prolonged drought which saw the catchment areas of South East Queensland's dams receive record low rain.
The dam is located approximately 14 kilometres (8.7 mi) north-west of Beaudesert.
The Wyaralong Dam was completed prior to the 2010–2011 Queensland floods. On January 11, during the flood period, the Mayors of both Logan City and Scenic Rim said they believed that Logan had been spared a great deal of flood damage because of the dam.
The concrete dam structure is 48 metres (157 ft) high and 490 metres (1,610 ft) long. The dam wall is constructed from a medium cementitious mix roller compacted concrete. The foundation is a sub horizontal dipping blocky sandstone. The dam is built with a 130-metre (430 ft) wide uncontrolled central primary spillway and an uncontrolled left bank secondary spillway which commences discharging at the 1:100 year flood level. The dam cross section is rather squat in order to provide sufficient resistance against potential sliding along foundation bedding planes. The 218,300-thousand-cubic-metre (7,710×106 cu ft) dam wall holds back the 103,000-megalitre (23×109 imp gal; 27×109 US gal) reservoir when at full capacity. From a catchment area of 546 square kilometres (211 sq mi) that includes much of the western portion of the McPherson Range, the dam creates an unnamed reservoir with a surface area of 1,230 hectares (3,000 acres). Teviot Brook and the surrounding land is a recognised Aboriginal Pathway with significant cultural heritage values.
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