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A model for simulating runoff pathways and water\udquality fluxes has been developed using the minimum information requirement (MIR) approach. The model, the Catchment Runoff Attenuation Flux Tool (CRAFT), is applicable to mesoscale catchments and focusses primarily on hydrological pathways that mobilise nutrients. Hence CRAFT can be used to investigate the impact of flow pathway management intervention strategies designed to reduce the loads of nutrients into receiving watercourses. The model can help policy makers meet water quality targets and consider methods to obtain “good” ecological status.\udA case study of the 414 km2 Frome catchment, Dorset,\udUK, has been described here as an application of CRAFT\udin order to highlight the above issues at the mesoscale. The\udmodel was primarily calibrated on 10-year records of weekly\uddata to reproduce the observed flows and nutrient (nitrate nitrogen – N; phosphorus – P) concentrations. Data from 2\udyears with sub-daily monitoring at the same site were also\udanalysed. These data highlighted some additional signals in\udthe nutrient flux, particularly of soluble reactive phosphorus, which were not observable in the weekly data. This analysis has prompted the choice of using a daily time step as the minimum information requirement to simulate the processes observed at the mesoscale, including the impact of uncertainty. A management intervention scenario was also run to demonstrate how the model can support catchment managers investigating how reducing the concentrations of N and P in the various flow pathways. This mesoscale modelling tool can help policy makers consider a range of strategies to meet the European Union (EU) water quality targets for this type of catchment

The Catchment Runoff Attenuation Flux Tool, a minimum information requirement nutrient pollution model