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. Management of water resources requires understanding of the hydrology andhydrogeology, as well as the policy and human drivers and their impacts. Thisunderstanding requires relevant inputs from a wide range of disciplines,which will vary depending on the specific case study. One approach to gainunderstanding of the impact of climate and society on water resources isthrough the use of an integrated modelling process that engages stakeholdersand experts in specifics of problem framing, co-design of the underpinningconceptual model, and discussion of the ensuing results. In this study, wehave developed such an integrated modelling process for the Campaspe basin innorthern Victoria, Australia. The numerical model built has a number ofcomponents: Node/link based surface water hydrology module based on the IHACRESrainfall-streamflow model Distributed groundwater model for the lower catchment (MODFLOW) Farm decision optimisation module (to determine irrigation requirements) Policy module (setting conditions on availability of water based on existingrules) Ecology module (determining the impacts of available streamflow on platypus,fish and river red gum trees) The integrated model is component based and has been developed in Python,with the MODFLOW and surface water hydrology model run in external programs,controlled by the master program (in Python). The integrated model has beencalibrated using historical data, with the intention of exploring the impactof various scenarios (future climate scenarios, different policy options,water management options) on the water resources. The scenarios were selectedbased on workshops with, and a social survey of, stakeholders in the basinregarding what would be socially acceptable and physically plausible optionsfor changes in management. An example of such a change is the introduction ofa managed aquifer recharge system to capture dam overflows, and store atleast a portion of this in the aquifer, thereby increasing the groundwaterresource as well as reducing the impact of existing pumping levels.

proceedings of iahs

Development of an integrated model for the Campaspe catchment: a tool to help improve understanding of the interaction between society, policy, farming decision, ecology, hydrology and climate