Defintions of Terms

Inactive or Dead storage volume is is the volume where water cannot be released through outlet structures.

Current volume is the volume of water currently stored

Active volume is the volume of water currently stored that may be released through outlet structures and is equal to the current volume less the inactive volume.

Spillway volume is the volume at the spillway crest level.

Full supply volume is the maximum volume that can currently be held safely within the storage. Note for gated storages this may be larger than the spillway volume.

Flood mitigation volume is a volume that the storage is managed to minimise the risks of downstream flooding and may vary throughout the year.

Percentage full is the percentage ratio of current volume to full supply volume. Note this may be greater than 100% in some cases.

Tributary inflow is the volume of water flowing into the headwaters of the storage over a period of time.

Storage catchment runoff is the volume of water flowing into storage over a period of time from the catchment between the headwater tributaries and the dam wall and upstream of the storage water surface.

Rainfall on storage is the average depth of rainfall over a period of time on the storage water surface.

Rainfall volume on storage is the volume of rainfall over a period of time on the storage water surface.

Storage inflow is the volume of water flowing into storage over a period of time that includes upstream tributaries, storage catchment runoff and rainfall on the storage.

Storage demand is the volume of water that has been requested to be released from the storage. Note this may be more than the storage release.

Storage release is the volume of water released to meet downstream demands. Note this may be less than storage demand due to release or operational constraints.

Storage spill is the volume of water discharged from the storage in excess of the storage demand.