Descriptive Fields
The policy and governance contexts described in the previous sections have directly shaped the design and analytical framework of the OPTAIN case studies. Rather than operating independently from European and national policy environments, each study area was analysed within its specific water, agricultural and climate policy setting.
EU directives and strategies define overarching objectives such as improving water quality, enhancing climate resilience, and promoting sustainable land management. These objectives influenced how case studies were structured, which pressures were prioritised, and which performance indicators were selected. At the same time, national and regional governance conditions determined the practical relevance and feasibility of the measures assessed.
Within OPTAIN, case study analysis integrates:
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Catchment-scale hydrological modelling (SWAT+)
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Field-scale soil–water process assessment
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Climate scenario simulations
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Environmental and socio-economic performance indicators
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Multi-objective optimisation of measure combinations
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Stakeholder engagement through Multi-Actor Reference Groups
This framework allows each case study to be examined not only in terms of environmental performance, but also in relation to governance constraints, incentive structures and local biophysical conditions.
Importantly, OPTAIN does not conduct regulatory monitoring or implement policy instruments. Instead, the case studies provide a structured environment to analyse how retention measures perform under real-world policy and climatic conditions, and how different governance contexts influence their potential uptake.
The interaction between policy objectives, modelling evidence, optimisation logic and stakeholder perspectives therefore plays a central role in interpreting results across study areas. Understanding this interaction is essential for translating scientific findings into insights that are relevant for territorial planning and policy design.