Students take on the role of engineers responding to a real community problem by designing a bridge that can move supplies safely across floodwaters under clear constraints. Through a launch challenge, repeated testing, scorecard analysis, critique, revision, and reflection, they learn to define criteria, evaluate solutions, and improve performance using evidence. The work builds critical thinking, collaboration, communication, and engineering design skills while leading to a public expo where teams demonstrate their tested bridge models and explain growth across trials.

Students will define precise criteria and constraints for a bridge that can move supplies across a simulated flood channel, including span, size, materials, time, cost, and safety needs for the community. They will apply the engineering design process to build, test, evaluate, and improve a bridge model, using a bridge test scorecard after each trial to compare cargo load, span success, and cost efficiency. Students will analyze competing design solutions, revise one design feature after each test, and explain with evidence how their changes improved performance under flood conditions. They will also strengthen collaboration and communication by making team decisions, participating in quick stand-up reflections, and presenting their tested model and scorecard growth at the Bridge Relief Expo.

Students will create a series of design artifacts throughout the project, including initial bridge sketches, criteria-and-constraints plans, material budgets, and bridge test scorecards that track cargo load, span success, and cost efficiency after each trial. Teams will also produce revised prototypes across multiple test rounds, with each version showing one specific design change based on critique and reflection from the previous test. By the end, each team will present a final tested bridge model that carries the greatest safe cargo load across the simulated flood channel while meeting span, size, material, time, and cost limits. For the Bridge Relief Expo, teams will share their final model, scorecard growth across trials, and a brief explanation of how their design improved supply delivery and safety in flood conditions.

Open with a Flood Relief Kickoff Lab in which teams try to move small “supply” items across a simulated flood channel using only a few simple materials under tight time and cost limits. After each quick trial, teams use a bridge test scorecard to record cargo load, span success, and cost efficiency, then briefly compare which designs worked best and why. End the launch by introducing the challenge question—how to design a bridge that delivers the most supplies safely across floodwaters within strict limits on space, materials, time, and cost—and have teams identify the first criteria and constraints they think will matter most.

Host a Bridge Relief Expo where families, school staff, and community members rotate through team stations to watch each bridge model span a simulated flood channel and carry test cargo. Each team gives a short presentation explaining the problem, criteria and constraints, key design revisions across trials, and how their scorecard data showed growth in cargo load, span success, and cost efficiency. Include a live or recorded final test, display design sketches and iteration notes, and invite visitors to ask questions about how the bridge would help a rural community recover after flooding.