| Nillahcootie Dam | |
| Location Map: | Australia Victoria |
| Location Map Caption: | Location of the Nillahcootie Dam in Victoria |
| Coordinates: | -36.8781°N 146.0028°W |
| Country: | Australia |
| Location: | Victorian Alps, Victoria |
| Status: | O |
| Operator: | GoulburnMurray Water |
| Dam Type: | E |
| Dam Crosses: | Broken River |
| Dam Height: | 34m (112feet) |
| Dam Length: | 791m (2,595feet) |
| Spillway Type: | Gothic arch-shaped crest |
| Spillway Capacity: | 73m3/s |
| Res Name: | Lake Nillahcootie |
| Res Capacity Total: | 40400ML |
| Res Catchment: | 439km2 |
| Res Surface: | 530ha |
| Website: | at GoulburnMurray Water |
The Nillahcootie Dam, a rock and earth-fill embankment dam with a unique Gothic arch-shaped crest spillway across the Broken River that is located near, in the Alpine region of Victoria, Australia. The dam's purpose is for the supply of potable water and for irrigation. The impounded reservoir is called Lake Nillahcootie.
Designed and constructed by the State Rivers and Water Supply Commission of Victoria, the dam was completed in 1967. The embankment dam wall is constructed with an earth core and rock fill, rising to a height of 34m (112feet).[1] The core component materials of the wall include of rock and earth. The reservoir has a capacity of 40400ML,[2] and can release a maximum outflow of approximately 117000ML per day in normal operation.[2]
The crest of the uncontrolled spillway is 264.5m (867.8feet) and the embankment is approximately 791m (2,595feet) long. When full, flood flows spill over a unique Gothic arch-shaped crest. The storage also features a secondary spillway that is operated only during severe floods. It uses the ‘fuse plug' principle, in which a section of earthen embankment within the secondary spillway (the fuse plug) has been designed so that at a predetermined flood level it will be eroded away and increase the discharge through the spillway.[2]
It is a popular water-skiing destination, especially during the summer.
The name is of Indian origin and is thought to mean "Blue House".