🗺️ Watershed and Supply Chain Overlay

Using printed watershed maps, product journey maps from Phase 1, and colored tracing layers, teams mark where manufacturing, transport, retail, use, and disposal systems could intersect with storm drains, rivers, and beaches. Teacher mini-lessons on variables, evidence types, and map-based reasoning are embedded just before teams annotate their overlays. Students use the map to surface where pollution can enter waterways and where evidence could realistically be gathered.