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- Order phase - There is a potential to reduce upstream orders through borrowing of tributary inflow. See Ownership at Inflow and Confluence Nodes - SRG for details.
- Flow phase - An owner can have a delivery shortfall as a result of higher than expected losses, lower than expected tributary inflows, or the use of its water by another owner that was planned in the order phase. If there is surplus water in the river at the point where the shortfall occurs, the owner with the shortfall can borrow from other owners.
Input parameters required
BPSystem - The borrow and payback system to use in determining distribution rules and, where relevant, updating accounts. Borrow and payback system(s) are associated with each model node and link during model initialisation.
component - Model component using this borrow method, needed for updating accounts.
Surplus(owner), Deficit(owner) - The current ‘surplus’ and ‘deficit’ volume/capacity for each owner. At a storage node, surplus water is any water that is not required to meet downstream requirements in the current time step. This definition may vary between model components, and between the model phases (order or flow). Refer to the SRG entry for the appropriate model component for more information.
Airspace - Each owner’s share of airspace in the borrow and payback system’s payback storage (when there is one). This is needed to limit lending.