| Chaffey Dam | |
| Location Map: | New South Wales |
| Location Map Size: | 270px |
| Location Map Caption: | Location of Chaffey Dam in New South Wales |
| Coordinates: | -31.3458°N 151.1386°W |
| Location: | Tamworth, New South Wales, Australia |
| Purpose: | Flood mitigation, irrigation, water supply, and water conservation |
| Status: | O |
| Owner: | State Water Corporation |
| Dam Type: | E |
| Dam Crosses: | Peel River |
| Spillway Count: | 1 |
| Spillway Type: | Morning glory |
| Res Elevation: | AHD |
Chaffey Dam is a minor ungated rock fill with clay core embankment dam with an uncontrolled morning glory spillway across the Peel River, located upstream of the city of Tamworth, in the New England region of New South Wales, Australia. The dam's purpose includes flood mitigation, irrigation, water supply, and water conservation.
Commenced in August 1976 and completed in September 1979, the Chaffey Dam is a minor dam on the Peel River, a tributary of the Namoi River, approximately north of Nundle and south-east of Tawmorth. Water from the dam is released directly into the Peel River which is used by irrigators downstream of the dam, and for water supply of the city of Tamworth.[1]
The dam wall comprises of rock fill is 55.8m (183.1feet) high and is 430m (1,410feet) long. The maximum water depth is and at 100% capacity the dam wall holds back of water at AHD. The surface area of the reservoir is and the catchment area is .
The dam uses an unusual concrete morning glory bell-shaped uncontrolled spillway which is capable of discharging .[2] [3] The spillway measures in diameter and tapers down to . The spillway tower is high.
Chaffey Dam provides valuable public recreation including swimming, sailing, boating and fishing.
An A$13 million upgrade of Chaffey Dam commenced during 2010 that involved the construction of a auxiliary spillway with release plug, funded by the Government of New South Wales and was completed in early 2011.[4] A second stage A$43.33 million augmentation commenced in 2013, funded by the Australian Government, the NSW Government and Tamworth Regional Council. This augmentation is expected to be completed during 2014 and involves raising the dam wall by and subsequent works to raise the morning glory spillway and bridge deck. These works will increase the full supply level of the dam by, the dam's capacity from to and ensure it can withstand the maximum possible flood. The project also involves a realignment of roads on the western foreshore; the Tamworth-Nundle Road, and River Road.[5]
The dam is named in honor of Frank Chaffey, who represented Tamworth in the New South Wales Legislative Assembly between 1913 and 1940, and his son, Bill, who represented the same seat between 1940 and 1973.