Assess and apply watershed management principles to reduce nitrogen and phosphorus runoff from agricultural land into a nearby lake. Tasks include identifying source areas on a simple watershed map, selecting and placing appropriate best management practices (e.g., riparian buffers, cover crops, contour tillage, controlled drainage, retention ponds), performing basic load-reduction estimates using provided BMP efficiencies, explaining trade-offs (cost, land use, effectiveness), and justifying a prioritized management plan that incorporates monitoring and stakeholder considerations. Scope: watershed-scale planning, BMP selection and evaluation, basic hydrology and nutrient pathways; intended for Grade 9–12 students with applied reasoning.