Présentations Colloques

Key Line
Antony Jakeman
Thinking and modeling beyond the aquifer: integrating policy, socioeconomics, ecology and interest groups into groundwater science and management through model-based processes
The presentation will introduce integrated modeling case studies of two catchments in the Murray-Darling Basin. The studies are being undertaken with key stakeholders, with the aim of identifying opportunities to attain improved water management in terms of socioeconomic and ecological outcomes. The opportunities are focussed on innovative conjunctive use options for surface and groundwater, derived from workshops with stakeholders. In the Campaspe study, the conjunctive use options are generally at a smaller scale, which means a more detailed model is required to explore the smaller scale issues (e.g. groundwater trigger levels and the impact on saline intrusion of water, or on-farm managed aquifer recharge and water use efficiency improvements), while in the Murrumbidgee study the greatest interest tends to be at a system scale, with large government water holders (i.e. Commonwealth Environmental Water Holder). Both case studies have different characteristics (e.g. modelling purpose, data collection, scales, stakeholder engagement) which will influence the modelling practices (i.e. technical and participatory) to be employed throughout the project.**The aim of the presentation is to reflect on the practices that were used in the modeling process, from stages of problem framing to evaluation of the models and conjunctive use alternatives. This reflection will be against the background of a new framework for determining effective model-based practices for integrated water management projects. We will use the two case studies to explain differences in practices being used, especially in the way (1) interactions with water managers and users were engaged in the problem framing, (2) the conceptual modeling was developed with stakeholders, and (3) the ensuing numerical modeling platform and components were selected. It is hoped that this analysis will contribute to demystifying the process of model-based identification and assessment of water management improvements and clarifying the selection of practices that are appropriate to a given problem setting. **