1.4 Lakes and wetlands
This line item represents the volume of water held in lakes and wetlands connected to the surface water store within the Canberra region.
These lakes are used primarily for recreation, conservation and aesthetic purposes, and are not formally associated with the urban water supply system. However, water can be abstracted or released to maintain environmental flows and for small-scale irrigation.
The volume provided is a sum of the volumes held in the storages in the Canberra region. Specific details of storages are provided in the following table.
|Storage name||Full supply level (mAHD)||Volume at full supply level (ML)|
|Lake Burley Griffin||NA||33,000|
mAHD = metres above Australian Height Datum; NA = data not available.
No storage volume or level information was available for any of the lakes or wetlands within the Canberra region. However, the capacity of these lakes and wetlands is known. Therefore, the total storage within the lakes and wetlands was estimated based on the assumption that these waterbodies were full at the start and end of the reporting period.
Assumptions, Limitations, Caveats and Approximations
- Water levels in Lake Ginninderra and Lake Tuggeranong are generally managed within 200 mm of full supply level throughout the year. Therefore, the estimated storage volumes of these lakes is considered to be only slightly overestimated.
- At present, abstraction from Lake Ginninderra and Lake Tuggeranong is limited to volumes that would have negligible effect on the volume of the lakes (<50 ML).
- The capacity of Lake Burley Griffin is based on survey data collected at the time of construction and fill in 1964.
The uncertainty estimate was not quantified.