The Murrumbidgee inter-valley transfer (IVT) account keeps track of net allocation trade to and from the Murrumbidgee valley.
A positive IVT account balance means there is currently net trade out of the valley. That is, water currently sits in Murrumbidgee storages for delivery out of the valley.
The Murray Darling Basin Authority draws water from the Murrumbidgee when required for Murray system operations, and the IVT account is debited accordingly.
A maximum balance of + 100 GL applies to the Murrumbidgee IVT account because this is the volume of water that can be physically transferred out of the valley via Balranald in one year without incurring excessive transmission losses.
A negative value would mean net trade into the valley from downstream. A negative balance is not allowed - it is not sustainable since water cannot be physically delivered upstream.
Proposed transfers that take the IVT account beyond the range 0 to 100 GL will not normally be approved, but may be considered on a case by case basis.
DPI Water can announce open and closure of allocation trade without notice.