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The calculation can be expressed by the follow equation:
Where:
| MAgeStorage,t: | The marker age of the storage at time step t. |
| MAgeStorageVol,t: | The marker age of the constituent only from the storage volume at time step t and it is equal to 1 plus the marker age of the storage at time step t-1. |
| StorageVolt-1: | The storage volume at the beginning of time step t. |
| MAgeUSFlowVol,t | The marker age of the constituent only from the upstream inflow to the storage at time step t. |
| USFlowVolt: | The volume of the upstream inflow to the storage at time step t. |
| MAgeConveyVol,t: | The marker age of the constituent only from the conveyance flux to the storage at time step t. |
| ConveyVolt: | The volume of the conveyance flux to the storage at time step t. |
Note that if the sum volume (i.e., StorageVolt-1 + USFlowVol USFlowVolt + ConveyVol ConveyVolt) in the equation is less than the required minimum storage volume at step t, the sum value will use the required minimum storage volume.
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