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Home>Water resources>Water storages>Rosslynne Reservoir
 Location
History
Purpose
Statistics
Recreational facilities
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| Location | | | Rosslynne Reservoir is located on Jackson’s Creek, 3 kms north-west of Gisborne.  Top
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| History | | The reservoir construction was completed in 1974 and has a capacity of 25,400 megalitres (ML).
Construction commenced in February 1971 with the river diversion along the right hand side of the creek, which is now the main outlet conduit, and was essentially complete by July 1974.
Following studies that showed the dam did not meet industry standards in relation to flood capacity, temporary works to lower the risk were carried out in November 1996, whilst investigation and design work was completed on a permanent dam safety upgrade. This involved raising the embankment by about 0.5m by the installation of an impervious membrane on the downstream face of the bankette.
In October 1998, rockfill was placed on the upstream face of the embankment to give the dam a uniform upstream batter slope of 1.8 horizontal to 1 vertical up to a level of 451.5m AHD. Previously some sections of the upstream slope had been as steep as 1.33 horizontal to 1 vertical which was no longer considered acceptable.
In 2000, major upgrade works were completed that brought the dam into line with modern industry standards. The works improved the flood capacity by raising the embankment by 1.9m and installing an 85m long secondary spillway on the right abutment. Filters were also installed on the right abutment to reduce the risk of piping.Top
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| Purpose | | | The reservoir provides additional water supplies to the townships of Sunbury and Gisborne and provides irrigation water to river diverters along the Maribyrnong River. Top
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| Statistics |
| Reservoir |
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| Capacity |
25,400 ML |
| Dead storage |
150 ML |
| Surface area |
198 Ha |
| Full supply level |
450.90 m AHD |
| Catchment area |
90 km2 |
| EMBANKMENT |
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| Length |
340 m |
| Maximum height |
37.0 m |
| PRIMARY SPILLWAY |
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| Crest length |
87 m |
| Discharge capacity |
72,000 ML per day |
| SECONDARY SPILLWAY |
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| Crest length |
87 m |
| Discharge capacity |
69,000 ML per day |
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| Recreational facilities | | | The majority of the reservoir is used for urban supply by Western Water and for this reason, the reservoir is closed to the public. Top
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| More Information | | If you require further information on Rosslynne Reservoir please contact 1300 139 510 or send us an email.
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