Assess the student's ability to analyze and quantify the relative contributions of point and non‑point nutrient sources to eutrophication in a temperate lake watershed. Scope includes designing monitoring programs, interpreting N and P concentration and flow data, applying load-estimation and source-apportionment methods (mass-balance, statistical models, tracers/isotopes), using watershed models (e.g., SWAT/SPARROW) for scenario analysis, conducting uncertainty analysis, and evaluating management options (BMPs, point-source controls). Students should compute source loads and proportions from provided datasets, critique methodological choices, and recommend evidence-based mitigation strategies.