Assess students' ability to create a complete, site-appropriate design for a sustainable rainwater harvesting and irrigation system for a small school garden. Tasks include site assessment (catchment area, runoff paths, soil type), basic rainfall/runoff storage calculations, selection of water-efficient irrigation methods (drip lines, wicking beds), native plant selection for the local climate, strategies to minimize stormwater runoff and improve infiltration, simple cost and maintenance plans, safety/regulatory considerations, and evidence-based justification. Deliverables: labeled sketch, step-by-step rationale, and supporting calculations.