Assess learners' ability to apply basic hydrologic calculations and design thinking to a small watershed scenario: estimate stormwater runoff volume and peak discharge using appropriate simplified methods (e.g., rational method or runoff coefficients) given area, land cover, and rainfall intensity; then design and size one or two green infrastructure measures (rain garden, bioswale, permeable pavement, rain barrel) to reduce peak flow and total runoff, showing calculations, assumptions, expected percent reduction, and brief justification of placement and maintenance considerations. Emphasize use of units, stepwise calculations, and trade-offs in cost, space, and effectiveness.