Test students' ability to analyze how urbanization, agricultural expansion, and deforestation alter watershed nutrient sources, transport, and retention, and how these changes affect stream ecology and eutrophication risk. Scope includes distinguishing point vs. nonpoint nutrient sources, hydrologic changes that increase runoff and loads, simple export-coefficient or mass-balance calculations, interpretation of water-chemistry and biological indicators (e.g., chlorophyll, dissolved oxygen, macroinvertebrate metrics), and evaluation of mitigation strategies (riparian buffers, stormwater controls, agricultural BMPs). Assessment uses short calculations, data interpretation, and case-study analysis.