Whilst there are two main headwater storages in the conceptual model, Dam 2 has little influence on the system compared with the Dam 1, being much smaller and only providing for orders upstream of the confluence. The town water supply node is based on a fixed monthly demand pattern, which is of substantially less volume compared with the irrigator demands included in the model. The irrigator demands vary over time based on the percentage allocation (the volume of water for each unit of licence which is updated during the season), estimated available water, and the irrigator’s risk function. Detail on the model formulation for the terminal wetland and groundwater recharge is discussed below.