The model was run over two periods to compare system behaviour during both dry and wet years, and the impact this has on the system objectives. For the dry period, the model was run from 1 January 2001 to 31 July 2006 using a daily time step, and for the wet period from 1 January 1959 to 31 July 1964. These periods were the longest within the flow record (1898-2006) which contained consecutive dry or wet years respectively, determined using a flow duration curve (with the exception of 1962, which fell into the middle 33% of flows). Initial storage volumes for Dams 1 and 2 were those used as initial conditions in the Lachlan