Ewen Maddock Dam
| Ewen Maddock Dam | |
|---|---|
 Location of the Ewen Maddock Dam
in Queensland |
|
| Country | Australia |
| Location | South East Queensland |
| Coordinates | 26°40′51″S 153°0′22″E / 26.68083°S 153.00611°ECoordinates: 26°40′51″S 153°0′22″E / 26.68083°S 153.00611°E |
| Purpose | Potable water supply |
| Status | Operational |
| Construction began | 1973 |
| Opening date | 1976; upgrade 1982 |
| Operator(s) | SEQ Water |
| Dam and spillways | |
| Type of dam | Embankment dam |
| Impounds | Addlington Creek |
| Height | 11.4 m (37 ft) |
| Length | 660–728 m (2,165–2,388 ft) |
| Dam volume | 352×103 m3 (12.4×106 cu ft) |
| Spillway type | Uncontrolled |
| Spillway capacity | 132 m3/s (4,700 cu ft/s) |
| Reservoir | |
| Total capacity | 16,590 ML (3.65×109 imp gal; 4.38×109 US gal) |
| Catchment area | 21 km2 (8.1 sq mi) |
| Surface area | 450 ha (1,100 acres) |
| Maximum length | 3.1 m (10 ft) |
| Maximum width | 2.6 m (8 ft 6 in) |
| Maximum water depth | 4.5 m (15 ft) |
|
Website www.seqwater.com.au |
|
The Ewen Maddock Dam is an earth-fill embankment dam with an un-gated spillway across the Addlington Creek that is located in the South East region of Queensland, Australia. The main purpose of the dam is for potable water supply of the Sunshine Coast region.
The Ewen Maddock Dam is situated approximately 5 kilometres (3.1 mi) southeast of Mooloolah and 3 kilometres (1.9 mi) from Landsborough to supply the fast-growing region with town water. The dam is built across the Addlington Creek, a tributary of the Mooloolah River, and was commenced in 1973, completed in 1976, with a subsequent upgrade to the height of the spillway in 1982.
The earthfill dam structure is 11.4 metres (37 ft) high and ranges from 660–728 metres (2,165–2,388 ft) in length to hold back 16,590-megalitre (3.65×109 imp gal; 4.38×109 US gal) reservoir when at full capacity. From a catchment area of 21 square kilometres (8.1 sq mi), the dam creates an unnamed reservoir with an average depth of 4.5 metres (15 ft). The surface area of the 3.1-kilometre (1.9 mi) long and 2.6-kilometre (1.6 mi) wide reservoir is 3.71 hectares (9.2 acres). The uncontrolled un-gated spillway has a discharge capacity of 132 cubic metres per second (4,700 cu ft/s). The dam is managed by Seqwater.
In the past, raw water from the dam has been supplied to a treatment plant at Caloundra. Since 1988 Ewen Maddock Dam was not used as a water source due to a lack of working water treatment infrastructure. In 2007, work begun on an A$30 million water treatment plant that will allow the dam to supply drinking water to the South East Queensland Water Grid, via the Northern Pipeline inter-connector. The Queensland Government incorporated a 100-metre (330 ft) timber boardwalk along the reservoir's edge into the revised master plan when open space at Ewen Maddock Park was resumed for the treatment plant's construction.
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Wikipedia