🛠️ Runoff Model Final Rebuild

Teams rebuild and retest their runoff model with trays, water cups, soil, sand, gravel, rocks, and plant cuttings or markers. They compare the new water path to an earlier version and use a simple class checklist to decide whether to move or add materials so water slows down and looks cleaner. One student records before-and-after drawings while others pour, observe, and explain the changes.