Mangrove Creek Dam, New South Wales
| Mangrove Creek Dam | |
|---|---|
 Location of the Mangrove Creek Dam in
New South Wales |
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| Country | Australia |
| Location | Central Coast, New South Wales |
| Coordinates | 33°12′54″S 151°07′04″E / 33.21500°S 151.11778°ECoordinates: 33°12′54″S 151°07′04″E / 33.21500°S 151.11778°E |
| Purpose | Water supply |
| Status | Operational |
| Construction began | 1978 |
| Opening date | 1982 |
| Owner(s) | Central Coast Water Corporation |
| Dam and spillways | |
| Type of dam | Embankment dam |
| Impounds | Mangrove Creek |
| Height | 80 metres (260 ft) |
| Length | 380 metres (1,250 ft) |
| Width (crest) | 6 metres (20 ft) |
| Width (base) | 250 metres (820 ft) |
| Dam volume | 1,340,000 cubic metres (47,000,000 cu ft) |
| Spillway type | Concrete lined chute |
| Spillway capacity | 570 cubic metres per second (20,000 cu ft/s) |
| Reservoir | |
| Total capacity | 190,000 megalitres (6,700×106 cu ft) |
| Catchment area | 101 square kilometres (39 sq mi) |
| Surface area | 7 square kilometres (2.7 sq mi) |
| Maximum water depth | 65 metres (213 ft) |
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Mangrove Creek Dam, a concrete faced concrete faced rockfill embankment dam, is the primary reservoir for water supply to residents of the Central Coast in New South Wales, Australia.
The dam, with a capacity of 190,000 megalitres (6,700×106 cu ft) and fed by a catchment area of 101 square kilometres (39 sq mi), is operated by the Central Coast Water Corporation and supplies approximately 93 per cent of water to 300,000 residents in Central Coast Council. The dam was constructed between 1978 and 1982, formed by impounding the headwaters of Mangrove Creek, a tributary of the Hawkesbury River.
The concrete faced rockfill embankment dam was built due to a rising demand for water from the expanding population on the Central Coast. The dam was built to boost water supply storage and to help provide a more reliable water supply. Mangrove Creek Dam was built using rolled, soft rockfill of sandstones and siltstones. This material was obtained from a quarry located within the storage area. These sandstones and siltstones were crushed and compacted to form the dam embankment. The embankment also contains approximately 100,000 cubic metres (3,500,000 cu ft) of processed basalt. This material was incorporated into various filters and drains within the embankment to cope with seepage within the embankment and foundations. The concrete face which tapers from 600 millimetres (24 in) at the base to 300 millimetres (12 in) at the crest acts as a seal between the water and the dam embankment. Provision was made to increase the height of the dam wall by 25 metres (82 ft) to a total capacity of 420,000 megalitres (15,000×106 cu ft) if the need arose in the future.
The height of the dam wall is 80 metres (260 ft), with a length of 380 metres (1,250 ft).
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