O'Shannassy Reservoir
Area of catchment
11,900 hectares
Type of dam
Earthfill embankment with reinforced concrete core wall
Maximum height of main dam from river to crest
34 metres
Length measured along top of dam
226 metres
Surface area (top water level)
27 hectares
Total available capacity
3,123 megalitres
Volume as at 30/7/2010
3,144 megalitres (100.0% full)
Where the water goes
To Silvan reservoir, distribution to most part of Melbourne.
Date of completion
1928
| O'Shannassy Dam Key Rainfall Facts (in mm) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Tot | |
| Wettest | 174.2 (1956) |
246.4 (1939) |
189.0 (1970) |
295.7 (1935) |
364.2 (1960) |
438.4 (1952) |
310.4 (1964) |
433.1 (1939) |
280.8 (1992) |
315.5 (1934) |
252.5 (1952) |
231.7 (1930) |
2166.9 (1952) |
| Driest | 1.8 (1990) |
0.4 (1991) |
3.6 (1951) |
13.2 (1963) |
3.1 (1934) |
23.0 (2006) |
45.0 (1994) |
49.8 (1982) |
34.0 (1961) |
38.4 (1940) |
25.9 (1927) |
9.4 (1972) |
829.4 (2006) |
| Average | 64 | 60.9 | 71.4 | 102.9 | 123.3 | 134.8 | 148.6 | 168.1 | 150.1 | 135.3 | 110.9 | 97.5 | 1367.9 |
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