Test students' ability to apply watershed-scale hydrological and nutrient-transport modeling to design land-use changes and best-management practice (BMP) strategies that reduce nitrate and phosphorus runoff. Assess model selection and setup, parameter calibration/validation, scenario development and comparison, spatial targeting of BMPs, interpretation of outputs (load reductions, concentrations, peak flows), cost-effectiveness and trade-off analysis, and uncertainty/monitoring planning; require quantitative justification using a provided hypothetical watershed dataset.