41.1 Precipitation on storages

Supporting Information

The volume reported (10,700 ML) represents the total precipitation falling onto surface water storages within the Adelaide region during the 2010–11 year. Precipitation to each surface water storage during the 2010–11 year is provided in the following table.

Precipitation to surface water in the 2010–11 year
Surface water storages Volume (ML)
Mount Bold Reservoir 2,177
Kangaroo Creek Reservoir 667
Millbrook Reservoir 1,305
Little Para Reservoir 592
Warren Reservoir 898
South Para Reservoir 3,170
Myponga Reservoir 1,891
Total 10,700

Quantification Approach

Data Source

Bureau of Meteorology: Australian Water Availability Project (AWAP) monthly precipitation grids; Australian Hydrological Geospatial Fabric (AHGF) waterbody feature class; Australian Water Resources Information System (AWRIS) water storage.

Provided by

Bureau of Meteorology.


Monthly precipitation data were produced by the Bureau of Meteorology. These were based on daily data from approximately 6,500 rain gauge stations and interpolated to a 0.05 degree (approximately 5 km) national grid (Jones et al. 2007)

Precipitation at each waterbody was estimated from the proportionally weighted average of grid-point cells that intersected each storage or weir (water feature). The precipitation volume was then estimated using the surface area of each waterbody. Surface area varied dynamically with changing storage level for storages, where the relationship between storage level and surface area has been derived.

Assumptions, Limitations, Caveats and Approximations

  • The precipitation estimates were subject to approximations associated with interpolating observation point data to a national grid detailed in Jones et al. (2007).
  • The dynamic storage surface areas calculated from the levels and capacity tables represent a monthly average and therefore will not capture changes that occur on a shorter temporal scale.
  • Precipitation was only estimated for the surface water storages and weirs (for which data were available) within the Adelaide region and did not include river channels.

Uncertainty Information

The uncertainty estimate was not quantified.