Assess students' ability to analyze how common human activities in a local watershed—such as urban runoff, agriculture, construction, and recreation—affect water quality (turbidity, nutrients, dissolved oxygen, pH), aquatic ecosystems (biodiversity, habitat health), and community uses (drinking, irrigation, recreation). Tasks include interpreting simple water-quality data, maps or graphs, identifying cause–effect relationships, and proposing practical mitigation or stewardship actions appropriate for grade 6–8.