When it rains, the city stream rises. A really strong storm could cause flash floods, turning the stream into a raging river. Piles of rocks and a wall of gooey mud could push on the piers of the concrete beam bridge and cause it to topple. Luckily, you can fix it before that happens!

How will you build a new, flood-proof bridge?

Build deeper piers	Build a higher deck	Use stronger material