Content
Natural Small Water Retention Measures (NSWRM) comprise a broad range of practices designed to improve water retention, regulate nutrient fluxes, and enhance the resilience of agricultural catchments. Within the OPTAIN project, these measures were not analysed as isolated interventions but as components of integrated portfolios evaluated through process-based modelling and multi-objective optimisation.
To ensure scientific consistency and comparability across case studies, OPTAIN applied a harmonised classification of NSWRM. Measures were grouped into three main categories reflecting their functional and spatial characteristics: Land Management Measures, Structural Linear Measures, and Structural Areal Measures. This typology was consistently used in modelling activities at field and catchment scales and forms the basis for cross-regional analysis and optimisation.
Importantly, the effectiveness of NSWRM within OPTAIN is derived from model-based simulations under current and projected climate conditions. Performance is therefore expressed in terms of predicted impacts on indicators such as water retention efficiency, nutrient retention efficiency, agricultural productivity, and cost-related metrics. The classification presented below reflects how measures were assessed within the modelling and optimisation framework, rather than real-world implementation.
The following sub-sections present the three categories of NSWRM, describing their functional logic, representative examples, and their role within the optimisation analyses conducted in the project.